Quote:
Originally Posted by Barbapapa
Larry, the reversion issue is eliminated for part throttle operation because there's a big throttle blade right there. The overall length of the intake tract isn't important. A typical ITB engine has the throttles almost completely closed during most cruising, more so with a big engine. Both the proximity of the throttle to the valves and the very fact that there's one for each cylinder are factors. The holes in the sleeves are to allow coolant to flow freely.
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Your engine modification is really an impressive piece of engineering and nice craftsmanship.
I have two questions re the principle designs which you have choosen.
Does the distance from the intake valve seat to the throttle affect reverse flow, performance, eficciency or anything else, under the assumption that the throat of the inlet tract is situated far away from the throttle?
Why did you choose the indirect TPS+MAP way of measuring the air flow instead of using one or two MAFs for direct air mass measurement into the plenum chamber, which is already part of your design? The first method doesn't cause any pressure drop in the intake system but a properly dimensioned MAF should give neglible. Isn't it very difficult to measure the over one cycle, hugely variable pressure, which fluctuations depends on the throttle angle and rpm?