Quote:
Originally Posted by markweatherill
Hi,
I have a little Mitsubishi 'i' car with a 660cc turbocharged engine. I discovered the intake piping has, at its lowest point, an opening with a rubber flap that opens outwards and would act to let water out, if any got in. Otherwise it's shut.
I removed the flap and put some speaker cloth over the opening to stop dirt ingress. Now the engine can breath in through that opening. I wondered if I'd notice any effect, as the opening is only 2cm or so wide, and I do see that on the overrun, the engine is pulling a slightly higher vacuum. Does that mean that the factory setup is a little restrictive?
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Mitsubishi builds aircraft and submarines 'n other stuff including automobiles.
They're no newcomer to fluid mechanics.
I suspect that the OEM manifold has already been flow tested and optimized as it is,and that under 99% of operation it will perform to best performance.
Allowing air to enter an 'exit' may compromise the tuning of the pathway(like reverse-direction pumping sewage uphill and through a toilet).And since you're making no change to the exhaust system,may be un-balancing the intake.
Intake/Exhaust is just like algebra: whatever you do to one side of the equal sign,you must do the to other.