dbr wrote:Thankyou again for your reply.
I had read throught this thread but the specifics of which radiators work is not covered other than "over 40mm thick".
The performance of radiator varies even if the tube thickness and fin density are the same, depending on details such as the sharpness of the fin forming tool.
Without the oppertunity to test the radiators, the best indicator is the experience of other people with similiar cars.
The change due to the oil-air cooler is probably primarily due to the removal of the standard oil-water cooler that rejects its heat through the radiator. The oil-water cooler have the advantage of warming up the oil during cold start opperation, improving lubrication and fuel consumption (less pump drag). An alternative to improve the cooling for track days maybe to temporilly remove the cooling fans and shrouds. The fans provide air flow during low speed opperation but the shrouds restrict the amount of air that can flow through at high speeds. Use the cooldown lap to cool the turbo so that you don't need to idle to long in the pits.
dbr wrote:One way to see who is right would be to try removing the fans next time you are at the track. It is a lot cheaper than buying an oil cooler kit.
bigdog wrote:Technically dbr is correct - a good radiator operating at high speed requires no fans to achieve optimum cooling, and the shrouds around the radiator are only effective at lower speeds. You wont find fans or rear shrouds on any open wheel race car or race built sports car. However your car needs to operate in traffic as well, and the fan/shroud arrangement is designed for this environment. The other variable is time spent idling on the start grid/dummy grid - plenty of race cars have cooked engines during delayed starts etc. My clubman racecar doesn't run a fan or shroud, and can idle on the start line for about 3 mins before I have to shut it down. So, in your case Dave, you could well improve your cooling on the track by removing the fans and shrouds and monitoring temps on a proper guage, but it is a fair bit of fiddle for a weekend warrior, and it sounds like the oil cooler is doing all you need anyway.
deviant wrote:Where abouts and how is your oil cooler mounted?
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