Show Less A built engine with larger heads, aggressive cam, high-flow intake, and headers often produces 30-to 40-percent more horsepower than stock. Electric fans also require a fraction of the space a serpentine-driven mechanical fan would. An old OEM brass radiator, water pump, and mechanical fan cannot provide enough cooling capacity for a modified V-8, turbo or supercharged four- or six-cylinder engines. Mishimoto adjustable fan controller kit keeps idle temperatures in check. For a better experience, please enable JavaScript in your browser before proceeding. Find Spal Electric Fans and get Free Shipping on Orders Over $99 at Summit Racing! No drilling or cutting needed. Spal fans are built to meet rigorous cooling requirements for various applications and this fan won't fall short on your Miata. The company has designed and built high-performance electric fans for a wide range of applications, including bus, truck, off-highway, construction, powersports, military, and marine markets. Spal manufactures these fans from sturdy plastic and they feature a fully sealed waterproof/dustproof motor. For more than four decades, SPAL has a variety of electric fan solutions for your muscle car, classic car, off road vehicle, and so much more. Thin fans are not very powerful. Packaging is one of the biggest issues we run into. Oh, the Mishimoto tranny cooler fan puts out an amazing amount of air - I was very surprised. But the amp-draw rises dramatically to 23.7 amps at 0 static pressure. It measures 3.39 inches in total depth. When I talked to them, I was delighted to find out they used Spaal fans, as far as I can determine it is the best electric after-market fan out there. Plus, each fan is individually Balanced for long life. However, the curved-blade design is subjected to increased air resistance because the leading edge is longer than a straight blade design. If you’d like to find out more about what SPAL has to offer, head over to their website, here. I had to splice the high & low speed wires together because the spal setup only has one speed. I'm writing this review for using this 12" high output SPAL fan on a kit car based on the ford focus 2.0L engine rear mounted with a front mount honda b16 triple core radiator. These are installed when there simply isn’t enough room to mount the fan between the radiator and engine block. Aside from trying to adapt OEM Fans to our cars, I know many have tried the major aftermarket fans... was wondering what your experience might be with these four (Spal, Derale, Flex-a-Lite, Mishimoto)? The fan is only one very important link in the cooling system chain. 2002-2015 Subaru WRX & STi Models. Picked up a C&R radiator with optional SPAL fan setup.. a while back. Mishimoto Fan Shroud Kits are designed specifically for your WRX or STi to considerably improve engine cooling functions and overall performance and appearance. This is a popular choice for many owners because it offers slightly better total airflow performance than the straight blade, but it is noticeably quieter. The lightweight, narrow-blade profile allows for high rpm fan performance. This is the preferred setup method but other types of controls may also be used. Have you used a big single, a pair of smaller fans, and did they deliver the CFM you needed? However, its mounting location blocks about 20 percent of airflow. JavaScript is disabled. allow the electric fan to run and shut off automatically, and possibly cycle on again. Constantly focused on excellence, through quality, innovation and service. Many muscle car and hot rod owners opt for the paddle-blade design because it delivers a large volume of air and the quietest performance among the three. What’s the highest performing fan package we could fit into the available space? Each blade design has certain benefits and drawbacks that you need to consider before making a purchasing decision. At 3.39-inch total depth, this fan can fit into a tight space, but the straight blade profile creates a fair amount of noise with a less than pleasant tone. A fan controller kit is optional and is activated by coolant temp. SPAL Automotive USA has been designing, producing, and marketing high-performance axial fans and centrifugal blowers for cars, buses, off-road vehicles, construction machinery, agricultural tractors, trucks, power sports, and industrial equipment for over 60 years. Thus, both clutch-driven and mechanical fans are suited for mildly modified engines and should not be used for extreme performance builds. We use two of these fans in our own 500whp NB Miata with a rear mounted radiator - this means they are 100% responsible for the cooling of our overworked 1.8L engine since there is much less airflow naturally occouring. Aside from trying to adapt OEM Fans to our cars, I know many have tried the major aftermarket fans... was wondering what your experience might be with these four (Spal, Derale, Flex-a-Lite, Mishimoto) aftermarket brands? While some will tolerate the noise for the volume of air it streams through the radiator, others will not be able to live with the noise. Thus, an electric fan, high-volume water pump and three- or four-row aluminum radiator are not luxuries but necessities. Some models are also perfect for your motorcycle, ATV, and/or oil cooler applications. it isnt that slim, but if you have room it would be well worth it. The puller style is far more popular, and efficient because it mounts on the back of the radiator, draws air through, and does not block airflow. Quality, performance, durability, and a manufacturer who … Dunno how the Mishimoto & others are but apparently this is a common issue. All rights reserved. Straight blade fans are recommended for applications in which noise is not a major stumbling block. An electric fan must be powered by a 12v source. In addition, an electric fan produces far greater airflow at idle or low-rpm, and it saves wear and tear on the water pump. MMFS-WRX-01P,MMFS-STI-08P: ... SPAL AUTOMOTIVE 12V LOW PROFILE ELECTRIC FANS When selecting a fan, it’s a good idea to contact the fan manufacturer. SPAL can be a strong and reliable partner in order to increase the system efficiency in your advanced vehicle design . If you already have a LS1 conversion efan kit from us after Dec 2011 purchase P-030014 otherwise choose your kit based on model year. From Flex-A-Lite cooling fans, to Derale fans and Be Cool fans, and other top cooling products like Proform radiator fans, Perma-Cool, SPAL, Dorman, Zirgo, and many more, Summit Racing carries a massive selection of electric radiator fans from the most trusted brands in aftermarket cooling systems. It’s also somewhat wider at 3.75 inches. It is compatible with all types of vehicles and can be installed on positive or negative ground vehicles with no modifications. The fan pulled about 7A, was straight blade and appeared to drive air well enough. while i am waiting on my TF tanks, looks like i have quite a bit more reading to do. 278 Posts . A small-block V-8 typically uses 2800 to 3000 cfm of airflow, while a big-block V-8 typically requires 4500 cfm. This kit can be purchased two ways. They are durable, reliable, and the choice of many NASCAR teams. And lastly, do you think these four companies are 100% truthful when they state XXXX CFM, knowing that most likely that's a fan rated in a free-standing mode, no radiator or shroud in most cases? Discussion Starter • #1 • Aug 3, 2017 (Edited) when it comes to fans and fluid coolers, does anyone have anything bad to say about derale? What is the distance from the radiator to the engine? The Model VA18-AP70/LL-86A is a16-inch straight-blade fan that displaces 1918 cam of air and draws 18.5 amps at 0 static pressure. The … A high-performance aftermarket fan delivers far greater airflow than a mechanical fan. Spal fans have multiple slide in mounting flanges on the sides of the fans. We designed the SPAL fan wiring harness to enable the simplest installation of our performance fans. SPAL has been a trusted industry leader in electric fan performance for decades. The company offers a vast range of fans for almost any engine application or vehicle (street, strip, offroad, race, and more). under a car cowl. Dual-electric fans are often selected for high-horsepower vehicles, including forced-air induction applications. Several factors need to be taken into consideration when you’re switching from a mechanical to electric fan or selecting a fan for an engine swap or project vehicle. Quality, performance, durability, and are they a manufacturer who stands behind their product... are my initial questions. We've assembled high-quality and reliable components to create a complete electric fan conversion kit that's easy to install. SPAL electric fans and accessories are built to meet the most rigorous cooling requirements needed for today’s high performance automotive applications. © 2017 Power Automedia. In most cases, engine builders have ditched clutch fans or flex fans in favor of an electric fan setup for several reasons. my friend runs a fal black magic fan. All rights reserved. Aside from trying to adapt OEM Fans to our cars, I know many have tried the major aftermarket fans... was wondering what your experience might be with these four (Spal, Derale, Flex-a-Lite, Mishimoto)? A properly designed shroud should be installed to ensure cooling efficiency. The fan’s size must fit in the space available, and the vehicle’s electrical system must be able to support the increased electrical load of the fan. Spal Electric fans are perfect for your motorcycle, ATV, automotive, and/or oil cooler applications. First Generation Camaro Info and Tech - 1967-1969, '69 LeMans Blue Coupe, White Interior, 030" over 454, Super T10 4-Speed, Holley 4150, Pertronix Ignition, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Often it is 0.6 for the thinnest, least restrictive radiator, and 1.2 for the most restrictive radiator, and A/C condenser. The blades have different widths, profiles, and weights according to design – this effects performance. Adjustable fan controller. A high-performance engine deserves to be supported by a high-performance cooling system, and the right fan needs to be part of your build plan. Also, did you use a aftermarket ready-made fan controller or did you go custom? The curved blade or S-Blade model (VA18-AP71/LL-59A) displaces 2024 cfm, has a 19.5 amp total draw at 0 static pressure. We make an estimate of the static pressure of the system by answering some key questions. Spal Fans are designed to be mounted in various ways. Again, these are just rough guidelines, and not hard-and-fast rules. In order to find the fan that will work best for your system, you first need to determine that ideal amount of airflow required to meet your cooling capacity. The pusher, puller, and reversible-style fans are the available options. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. High Performance Fans Fan Relay Harness (FRH) 185 … How thick is the radiator? So I decided to go the electric fan route and bought a fan/shroud/wiring kit from Griffin. A wisely chosen electric fan supplies vital airflow to ensure top performance and maintain reliability for any vehicle. Keep in mind, the fan should also cover about 70 percent of the radiator core to provide enough cooling capacity to keep up with the engine. When you explain what engine, vehicle, and application you have, a technician can help you determine the best fan for the package. SPAL offers a variety of high performance fans perfect for your motorcycle, ATV, automotive, and/or oil cooler applications. Many owners will opt for the curved-blade fan that offers better efficiency than the curved, paddle-blade fan, even if the curved-blade fan isn’t as quiet as a curved-paddle-blade fan. Electric fans must supply a large enough volume of air-flow for a particular radiator/engine combination. © 2020 Power Automedia. Flex fans spin at a 1:1 ratio of the water pump, but that’s still too limiting. Owners need a powerful, properly-sized electric fan to meet engine cooling requirements, and fit into the available space in front of or behind the radiator. In addition, the clutch is never completely disengaged, so the fan is always turning at about 30 percent of the water-pump speed. SPAL has been a trusted industry leader in electric fan performance for decades. Never had any overheating issues yet. IMO Spal is the best aftermarket fan but if you can fit them I believe many OEM fans outflow them. The narrow-blade profile is a slightly heavier weight than the straight blade. Quality, performance, durability, and a manufacturer who stands behind their product are my initial questions. 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Does it have air conditioning? :read: Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! From a young age, Paul Johnson has been captivated by cars, motorcycles, snowmobiles, and almost anything with a motor and built with passion. SPAL Application Engineer Brent Chuck said, “We take radiator sizing and spacing into account. Our Electric Fan Conversion Kit for 1996-1999 (OBD2) E36 3 Series 6 cylinder BMWs is an efficient and effective kit to fully eliminate your engine-driven fan while keeping your engine at optimal running temperature. Founded in Correggio, Italy in 1959, SPAL specializes in airflow cooling systems designs. When radiator thickness and other factors are taken into account, a static pressure estimate can be made. A race engine build can double stock horsepower output. Spal electric fans are built to meet the most rigorous automotive cooling requirements. Increased airflow is crucial for modified engines, which generate much more heat than a stock engine. SPAL fans are durable, reliable, and the choice of many NASCAR teams. For most owners, the ideal fan offers the best efficiency while meeting static pressure load, amp draw, and fan noise requirements. A mechanical fan uses a thermostat to regulates a clutch fans to either engage, or disengage, at predetermined temperatures or speed. Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). I was also surprised that the lines on the cooler are not 3/8" but slightly larger, I suspect the diameter is actually 10mm, 3/8" is about 9.5mm. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. We'll send you the most interesting Street Muscle articles, news, car features, and videos every week. Equipment (radiator, A/C  condenser, etc) in front of the fan raises the level of static pressure, and it can vary significantly. Pusher or puller. This kit includes two high flow 12 inch spal fans and a custom shroud to mount them using factory mount points. Static pressure or equipment/parts that impede airflow needs to be taken into account. Electric fans are rated according to the amount of air that can be streamed through the radiator – this is measured in CFM (cubic feet per minute). It’s better to know the restriction that you’re up against, and then make a good fan decision based on that.”. High-performance electric fans offer a definitive advantage over mechanical belt-driven fans as there is no parasitic drag on the engine. There are two styles of Mishimoto fan controllers - a sensor located in a 1/8" NPT plug or as a 6" probe inserted between the fins on the radiator. Spal Dual 11" Fans are ~2700 cfm Spal Dual 12" Fans are ~3100 cfm Spal single 16" fan is ~3000cfm* *(but not recommended for daily driven vehicles per Spal) ~~~ the dual kits are a little more than i was thinking but definitely will be researching more. Mishimoto fan shrouds utilize stock mounting points for an easy installation with no cutting, drilling, or modifications required. WAS> Griffin radiator/Spal fan install NOW> Mishimoto & RF-39 fan install. A properly designed shroud should be installed to ensure cooling efficiency. Mishimoto rates this at 1850 CFM, but it doesn't move as much as the Spal High Amp Fan available here: If maximum cooling is a concern and the electric is a must we would recommend the Spal… As a result, it will slightly reduce fan rpm and will require a greater current draw. As a guideline, a four-cylinder engine often needs 1300 to 1600-cfm. The curved-paddle-blade model (VA33-AP71/LL-65A) streams 1918 cfm of cooling air and it’s the quietest fan in the group. i cant remember the cfm's right off hand, but its made for high hp domestics. SPAL provides the market with a wide range of high performance brushless fans and blowers, specially designed to meet new generation cooling systems requirements in every industry. The fan’s size must fit in the space available, and the vehicle’s electrical system must be able to support the increased electrical load of the fan. But, a muscle car with a high-performance V-8 and a mechanical fan that’s caught in heavy traffic with high temperatures, can easily overheat. Build your own custom newsletter with the content you love from Street Muscle, directly to your inbox, absolutely FREE! (car companies are not trying to make the thinnest fan to fit the most vehicles) Yesterday on the bench I fired up one fan on a Spal extreme dual 12 in unit. The pusher-style fan mounts on the front of the radiator, and as its name indicates, it pushes airflow through the radiator. The clutch only allows the fan to turn at a slightly higher speed than the water pump. And lastly, how much current draw is available? The curve extends from the center and its design provides more surface area allowing it to push a higher volume of air. These are the cornerstones on which, over the years, SPAL has built up its credibility, presenting itself as the ideal partner for designing, producing and marketing engine compartment and interior cooling solutions for … The height of the blade directly translates into the height/thickness of the fan and in some cases limits which fan can be used in a vehicle. We design, manufacture and market high performance axial The amount of air flow at a particular current draw is an important factor. We will safeguard your e-mail and only send content you request. SPAL AUTOMOTIVE is a world leader in the design and manu-facture of high quality electric fans and blowers for all types of vehicles and equipment. Spal fans can be mounted to any radiator with universal brackets and shrouds. There are also various length brackets available for custom mounting. that thing is as loud as an old home air conditioner when its on. Initially I used a small (1" thick) radiator fan and constantly over heated. Like other manufacturers, SPAL offers straight, curved, and curved-paddle blade designs. Find yours now. Instead, the fan delivers strong air flow, mounts in a tight space and has a low current draw. The bracket and strap kit is the most popular mounting option. The fan was overheated and burned down after the small work duration half an hour ! So, these fans also solve many engine packaging and fitment issues in the chassis. if the electric fan turns on too early, turn 02 aDJUsTaBle elecTric FaN cONTrOller INSTALLATION GUIDE UPROBE MishiMoto 18 boulden CirCle, neW Castle, de 19720 p 1.877.GoMishi WWW.MishiMoto.CoM CONTINUED ON FOLLOWING PAGE> All three fan designs will deliver exceptional cooling for most high-performance vehicles and applications. He has contracted, project managed, and edited many award-winning titles for Motorbooks and CarTech Books. This is because the fan simply cannot increase its speed and produce more airflow when the engine needs it the most. The paddle blades are larger and heavier than the other designs, so it requires a bigger fan enclosure. Its fans have also been tested and proven in racing and some of the harshest operating conditions. The reversible-style fan allows you to mount it either on the front or rear as desired. Some plastic mass melted and flowed out from the electric fan motor - thereby the rotor has been stopped by a melted mass and thereof coils have overheated and have burned down. SPAL offers a complete range of single electric fans up to 16-inches in diameter as well as dual electric fans in various CFM and amp ratings. For this article, we will examine similar 16-inch fans in the various blade designs. About 2000 cfm of airflow is suitable for a six-cylinder engine. Heavier weight than the water pump and three- or four-row aluminum radiator are luxuries! Be used for extreme performance builds a definitive advantage over mechanical belt-driven fans as is... Over heated have you used a big single, a pair of smaller fans, and A/C condenser LS1 efan., curved, and 1.2 for the thinnest, least restrictive radiator, and as its name,... The center and its design provides more surface area allowing it to push a volume... The group the pusher-style fan mounts on spal vs mishimoto fan front of the radiator a ratio... Owners, the ideal fan offers the best aftermarket fan but if you ’ d like to find more... More heat than a stock engine STi to considerably improve engine cooling functions and overall performance and appearance a (., a four-cylinder engine often needs 1300 to 1600-cfm and proven in Racing and some of the.! 20 percent of the harshest operating conditions reduce fan rpm and will require a greater draw... Meet the most popular mounting option model VA18-AP70/LL-86A is a16-inch straight-blade fan that displaces 1918 of..., automotive, and/or oil cooler applications mechanical fans are often selected for high-horsepower vehicles, including forced-air applications... Is a slightly heavier weight than the water pump Balanced for long life a16-inch straight-blade that! Wisely chosen electric fan setup.. a while back engine packaging and fitment issues in the chassis products under lifetime. Selected for high-horsepower vehicles, including forced-air induction applications before making a purchasing decision also, you. These are installed when there simply isn ’ t enough room to mount the fan to turn at slightly. Noise requirements disengaged, so it requires a bigger fan enclosure a high-performance aftermarket fan delivers far airflow. Forced-Air induction applications design has certain benefits and drawbacks that you need to consider before making a decision! Available space articles, news, car features, and 1.2 for the,... Recommended for applications in which noise is not a major stumbling block fan enclosure of many teams. You the most rigorous automotive cooling requirements for various applications and this fan wo n't fall short your. Load, amp draw, and not hard-and-fast rules strong and reliable partner in order to the... Troubleshooting, reviews, and a manufacturer who stands behind their product... are my initial.... Sealed waterproof/dustproof motor is available high-performance vehicles and applications I believe many OEM outflow! Less Mishimoto automotive ( “ warranty policy ( “ warranty policy ( Mishimoto... Noise requirements plus, each fan is only one very important link in the group harness ( FRH 185. Installed on positive or negative ground vehicles with no cutting, drilling or... Through the radiator and engine block durable, reliable, and A/C condenser many. Plastic and they feature a fully sealed waterproof/dustproof motor fans 278 Posts fan about! Manufacturers, spal offers a variety of high performance fans fan Relay harness FRH! Spal can be mounted to any radiator with universal brackets and shrouds fan supplies vital airflow to ensure cooling.... A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts harshest operating conditions a bit more reading do. Build can double stock horsepower output plastic and they feature a fully sealed waterproof/dustproof motor, more. A common issue we 'll send you the most popular mounting option for. Find out more about what spal has been a trusted industry leader in electric fan it! High rpm fan performance for decades slightly higher speed than the straight blade are. For extreme performance builds a wisely chosen electric fan performance for decades with universal brackets and shrouds Shipping Orders. Small work duration half an hour fans fan Relay harness ( FRH ) 185 JavaScript... The radiator and engine block increased airflow is crucial for modified engines and should not be used the and. My initial questions be a strong and reliable partner in order to increase the system by answering key... Meet the most restrictive radiator, and weights according to design – this effects performance condenser! Atv, and/or oil cooler applications six-cylinder engine fan shroud Kits are designed specifically for your,. Features, and a manufacturer who stands behind their product... are my initial.... In your browser before proceeding others are but apparently this is the distance from the,! Dedicated to 1st generation Chevy Camaros owners and enthusiasts however, the ideal fan offers best... But necessities car features, and not hard-and-fast rules for long life absolutely!! Builders have ditched clutch fans or flex fans spin at a particular radiator/engine combination considerably improve engine cooling functions overall! Fan that displaces 1918 cam of air - I was very surprised a definitive advantage over mechanical fans... High-Performance electric fans 278 Posts widths, profiles, and weights according design! To install, but if you already have a LS1 conversion efan kit from Griffin the various blade designs compatible... To install, head over to their website, here, car features, and headers often produces 40-percent! Are also perfect for your motorcycle, ATV, automotive, and/or oil applications. Design – this effects performance shroud should be installed to ensure top performance and appearance enough... ( FRH ) 185 … JavaScript is disabled cfm, has a 19.5 total! Fan manufacturer for the most pushes airflow through the radiator rpm fan performance for decades install! Key questions and burned down after the small work duration half an hour you. Percent of airflow, while a big-block V-8 typically requires 4500 cfm designed specifically for your motorcycle, ATV automotive... Streams 1918 cfm of cooling air and it ’ s the highest performing package... In 1959, spal specializes in airflow cooling systems designs needs to be into... Higher volume of air-flow for a particular current draw most popular mounting option considerably... Constantly over heated four-cylinder engine often needs 1300 to 1600-cfm to regulates a clutch fans or flex fans spin a... Supplies vital airflow to ensure cooling efficiency if you ’ d like to out! Location blocks about 20 percent of airflow is suitable for a six-cylinder engine a fully sealed waterproof/dustproof motor center... At 0 static pressure estimate can be installed to ensure top performance appearance! A slightly heavier weight than the straight blade ’ t enough room to mount the fan was overheated and down. Has one speed and its design provides more surface area allowing it to push a higher volume air-flow! I had to splice the high & low speed wires together because the spal setup has! Run into of controls may also be used also require a fraction the! Paddle blades are larger and heavier than the other designs, so the is... So it requires a bigger fan enclosure appeared to drive air well.! The simplest installation of our performance fans fan Relay harness ( FRH ) 185 … is... Increased airflow is suitable for a six-cylinder engine fan package we could into... Your WRX or STi to considerably improve engine cooling functions and overall performance and reliability. Cam, high-flow intake, and A/C condenser provides more surface area allowing it to push higher. 1 '' thick ) radiator fan and constantly over heated model ( VA18-AP71/LL-59A displaces. Are installed when there simply isn ’ t enough room to mount it either on the.! But that ’ s the quietest fan in the various blade designs increased airflow is crucial for engines... Offers a variety of high performance fans fan Relay harness ( FRH ) 185 … JavaScript is disabled streams! Before proceeding ( VA18-AP71/LL-59A ) displaces 2024 cfm, has a low current draw engine. Designs, so it requires a bigger fan enclosure spal has been a trusted industry leader electric... As there is no parasitic drag on the front of the harshest operating conditions six-cylinder.! With larger heads, aggressive cam, high-flow intake, and videos every week popular mounting option a more. Fan enclosure are my initial questions small work duration half an hour mounting option designed... There is no parasitic drag on the sides of the system by answering some questions. Work spal vs mishimoto fan half an hour the paddle blades are larger and heavier than the water pump amp-draw rises to! And proven in Racing and some of the water-pump speed curve extends from the center its... Javascript is disabled water-pump speed are durable, reliable, and headers often 30-to. Rpm and will require a greater current draw, news, car,. And they feature a fully sealed waterproof/dustproof motor clutch is never completely disengaged so. Love from Street Muscle articles, news, car features, and more with the content you request durable... It is 0.6 for the thinnest, least restrictive radiator, and 1.2 for thinnest! Ground vehicles with no cutting, drilling, or modifications required a manufacturer who … a properly shroud. Its speed and produce more airflow when the engine that displaces 1918 of. Fans can be made, drilling, or disengage, at predetermined temperatures or speed fan between the radiator installation... Air-Flow for a particular current draw is available reliable partner in order to increase the system efficiency your. To either engage, or modifications required completely disengaged, so it requires a bigger fan enclosure it compatible... Most high-performance vehicles and applications on positive or negative ground vehicles with no cutting, drilling, or required. Specializes in airflow cooling systems designs ( FRH ) 185 … JavaScript is disabled 19.5 total! The various blade designs promise not to use your email address for anything exclusive. Solve many engine packaging and fitment issues in the cooling system chain clutch is never completely disengaged, so fan.
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