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Old 09-29-2014, 08:12 PM   #8 (permalink)
blownoiler
performance with economy
 
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Quote:
Originally Posted by Varn View Post
My VW Diesel has the intake air for the engine come from the fender well.

Would using preheated air improve the mileage? I don't have any instruments and have to rely on calculating efficiency based on gas mileage.
Is your injection system run by a computer? The older mechanical injection systems can benefit from an underbonnet air intake when ambient temps are very low, the computerised systems generally give better results with cooler air, but you can heat the fuel for better mileage if you are running alternative fuel, but I wouldn't suggest that you heat low sulphur diesel as pump/injector wear may be accelerated.
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