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Old 12-12-2014, 09:19 AM   #11 (permalink)
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Quote:
Originally Posted by herberpower View Post
My father says I'm nuts . that to work better air must be as cold as possible . there is more power. other sport bikes have front air intakes for between cold and pressure.
As Frank noted - cold air = more power - if you tune for it by richening the mixture.

For efficiency, hot air atomizer fuel better and requires a leaner mixture - which usually improves mileage.

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Old 12-13-2014, 08:13 AM   #12 (permalink)
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I understand

cold air more power
Hot air better fuel economy .
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Old 12-13-2014, 08:36 AM   #13 (permalink)
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On the original Nissan-Datsun 240Z, if you had every thing set in specs and the carbs perfectly adjusted, at about 50 degrees F, if you did not move the preheat flap to winter, the car was undriveable. Move the flap to winter and it became driveable almost instantly, within a few seconds. No other changes.

Variable venturi carburetors are especially prone to "icing" which is basically due to incomplete atomization of the fuel mixture.

Cold air being more dense will give more power with higher effective compression, but without fuel injection atomization and economy will both suffer. Even my 37 Ford with the original engine had a passage in the intake manifold where exhaust gasses heated the manifold right under the carburetor.

It's ancient efficiency technology.

regards
mech

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