Quote:
Originally Posted by rick130
anyway, I say do it, as I reckon the Defender has a problem with airflow through the radiator caused by high pressure air in the engine bay being unable to escape.
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I'd like to know what you base that on - there are wide gaps each side of the engine, even on a V8 leading into a large open area under the body/chassis/gearbox, which because of the shielding effect of the front axle, I would expect to have relatively lower pressure at speed, certainly lower than the pressure of air forced by the ram effect through the radiator. And this under body volume has a large exit area each side, even though the rear axle impedes the exit there.
Certainly the cross section area of the escape path down the sides of the vehicle and out underneath is vastly greater than any possible scoop on top. Of course you could always leave the bonnet off, but that has its drawbacks as well.
There may be a patch of stagnant air in the top rear of the engine compartment, but with the overall airflow through the engine compartment I rather doubt it - that air bleeds down over the bell housing and gearbox and out under the sides of the vehicle - if you don't believe me, feel the floor and transmission tunnel after a run, and no, that is not the gearbox getting hot - if its hot, it is probably from this hot air.
John