I've had a couple of responses to my question. Most saying that there shouldn't be a problem cause as the engine turns faster more air flows to cool the engine, or that I have a leaky engine compartment. '80 Westi. Engine compartment has no holes bigger than a quarter. Well here's what I know. During my downhill travels I freewheel and use my brakes (CV's are shot and I reversed them so make ugly noises downshifting, so I don't). When I do that the engine oil temp drops about 30 degrees. As I sit in traffic and idle the oil temp rises. According to the above logic, if I sit in traffic and rev the engine my oil temp should drop! I'm not willing to try it. So my theory still applies, revving my engine up while on a dyno would overheat my engine as insufficient air is being scooped into the engine compartment. Vehicle speed = better cooling. That's why later busses had outdented intakes, ie scoops. Some of this must be the case, as they put a fun in front of those watercooled standard cars to increase the air flow. Where would they put one for a VW? If the dyno testing is short, it may not affect anything. One response to having had it done to a Type3. - Jeff '80 Westi, '67 Sqbk
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