![]() Op what transmission do you have, do you have a 700R4 transplant? (IDK why someone would mount a 305 4" further forward unless a 700R4 was installed and instead of adjusting x member and DS.they shoved the motor mounts forward. Typically Summit, JEGS, etc has them in various sizes. You could also likely run a 18" fan blade as the new opening would be wider when you cut down a stock 21" shroudĪnother alternate would be to buy a generic shroud (4") and use those through the radiator plastic hold downs. The standard 21" shroud could be cut down all the way around so the fan blade is 1/2 in/out of the newer cut down opening. Since he has a 21" radiator shroud.the 327 with AC one is also about 7 1/2" deep This is the 327 AC shroud for the 23" radiator (what I have)īut in the OP's case with engine mounted 4" forward any of the 2 SBC shrouds would need trimming. It is centered opening as the 327 is set center where the BB was offset to the PS to clear steering box so that fan opening is about 1" towards passenger side It’s not that difficult to accomplish – see the accompanying photos for a closer look.Click to expand.Actually there were 3 fan shrouds. There’s more too: If you take the time to effectively seal any gaps between the fan shroud and the radiator, cooling can improve. The shroud simply allows the largest volume of air to be pulled through the rad (typically in a pull through application). Typically, this is accomplished by way of an integral shroud surrounding the electric fan. Specs are as follows:Īll of the above have a low amp draw, but Davis points out that one of the other secrets to properly cooling a high performance car is to effectively seal the radiator to the fan. Davis offers a trio of fans – 12-inch, 14-inch and 16-inch diameters. This might be a good choice for a car that's either blessed with a cooling dilemma or one that sees double duty as a weekend racer.Ĭompanies such as Ron Davis Racing Products have spent considerable time researching cooling fans with these criteria. A good example is a pickup truck with a factory towing package. This arrangement is particularly useful if heavy cooling tasks are mandated by the application. Sometimes electric fans are used in conjunction with an engine driven clutch fan (typically, an electric pusher fan mounted ahead of the rad). In general terms, both electric and engine driven fan shrouds are effective for cooling. If your 2008 Toyota Tundra exhibits these symptoms, let our Toyota technician inspect your vehicle. A broken fan shroud may also come in contact with your radiator fans blades and make noise while the fan is running. Motor vehicle manufacturers have used both configurations in modern passenger cars and light trucks, although puller fans are the most common. Which type of fan shroud should I use By Admin / / Product Details, Questions and Answers. A broken or missing radiator fan shroud can cause your engine to run warmer than usual. no need to disconnect anything other than the hoses. ![]() Seems to me that the shroud is mounted to the core support with about 4 bolts and just slides back over the water pump pully. In the case of electric fans, you usually have two options: A pusher fan and a puller fan. Its been about 2 years since I replaced the radiator in my 07 5.7 GC but I dont remember having to remove the fan shroud. So where do you find shrouds for older cars? That’s simple too: The restoration aftermarket is loaded with quality reproduction shrouds for all sorts of applications. The bottom line is simple: If you don't run a proper shroud, you're only asking for overheating grief. If the shroud is not present, it creates a considerable amount of "dead" space behind the radiator that in turn destroys the effectiveness of the fan assembly. As long as we’re talking about cooling fan operation, I think the fan shroud is at least worth noting. This isolates the pocket of air behind the radiator, allowing the fan to efficiently draw the required air through the radiator. It butts up tightly to the face of the radiator, effectively sealing the cavity. How does the shroud work? Basically, the shroud surrounds or partially surrounds the fan. If you don’t have a shroud or if it fits poorly, get the right one (that's a big hint if you end up sitting behind Old Faithful on a regular basis). Keep in mind that shrouds are often manufactured from plastic and as result, the condition typically degrades dramatically over the years. Unfortunately, they are often missing on any number of older cars. Increasing the airflow through the radiator improves the cooling and as a result, a shroud is almost mandatory on high performance applications. The idea is of course to provide a constant supply of air through the radiator so that the coolant is reduced in temperature. But when it comes to cooling you absolutely must first figure out a way to bring the air to the radiator (cooler).
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