Given that the under bonnet temperatures can get quite high, especially here in Oz, and that engines run better with cooler more dense air I am wondering if anyone had fitted piping to the two air filter trumpets to draw cooler air from outside the engine bay and if sonwith what result?
Cheers
Michael
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V8 induction improvements
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Re: V8 induction improvements
The problem is that the reduction in mass flow caused by increased temperature is modest . It varies more or less in inverse proportion to the absolute temperature of the air in degrees Kelvin . So if, for example, the ambient temperature is 30C ( 303.5K) and the underbonnet temperature is 50C ( 323.5K ) the loss of flow at constant pressure is about 6.2% . If you pipe cold air in, you will retrieve some of that loss but, and it is a big but, you will suffer a loss of flow which varies as the 4th power of the diameter of the tube(s) - and of course the length of tube affects this as well . I have no idea what the overall effect is, but you can see that there are no straightforward gains. Probably the most effective mod is to use a large diameter tube to feed cooler air to the vicinity of the filter but not to close the filter tubes off from the underbonnet area
Note also that in a humid climate the effect of reducing intake temperature may be to bring the overall situation into the area where carburetter icing may become a problem - if you have a look at modern piston aero engine information you will see that this can occur at surprisingly high ambient temperatures
Note also that in a humid climate the effect of reducing intake temperature may be to bring the overall situation into the area where carburetter icing may become a problem - if you have a look at modern piston aero engine information you will see that this can occur at surprisingly high ambient temperatures
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Re: V8 induction improvements
Wow! What a technical answer. Thank Chris. I guess I'll just leave well enough alone.
Cheers
Michael
Cheers
Michael