<VV> Engine Bay Air temperature experiment
wrokit at hotmail.com
Fri May 22 19:20:08 EDT 2015
I've been fine tuning my EFI set-up recently and was curious as to how hot the engine compartment air was getting
while the engine was running during normal cruising. The engine compartment air temperature was a particular concern
to me as I don't have a heat shield on the turbo (yet) and, until very recently hadn't bothered to put on the rear engine
compartment seal either. Anyways, I thought I remembered someone on this board had asked about engine compartment
air temps sometime ago and I just got done doing the test, I thought I would share my results.
Since I was concerned about the air temp just before it enters the air cleaner, I put a digital thermometer probe on top
of the throttle body's, not touching any metal, approximately 1" away from the air cleaner.
Morning before starting engine and driving to work: T= 53F, 10 miles later, T=67F, head temperature was well below 300.
Afternoon before starting engine and driving home: T=83F. stopped at gas station to get gas after 2 or 3 minutes of running-
right after re-starting the car, T=97F. Continue on home, head temperature gets to 300 degrees, and the digital thermometer
I've done this same test 2 days in a row now, and have gotten the same results each day, and I also verified that the digital
thermometer agrees well (within 1 degree) at 52F and 70F with our outdoor thermometer.
For curiosity's sake only!!
63 Turbo, EFI daily driver
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