AcuraV said:
wow...impress explaination. it is correct during low pressure, remaining exhaust gas with retained in cylinder???
if that is the case...poor to my engine cos mine 2.5' complete piping...
Sorry ar Ken, please forgive me, i went into too much technical.
Office=Cylinder
Fire Escape Staircase=Exhaust Manifold
Fire Escape Door=Exhaust Valve
Assumption=Pressurised System not working.
Simple explanation; your office on fire, there is smoke in your office, all the oksigen burn liao. So only left the smoke. And the office inside now is like vacuum. Fire Escape Door opens and smoke rushes out to the Fire Escape Staircase, oksigen from inside the Staircase will go back into the office and smoke go back out. Feeding MORE air to the FIRE!!. If the staircase is toooo big, air pressure will low and smoke comes out slower and there is less air to smoke exchange ratio. Too small oso cannot because even with high pressure in the staircase not much smoke can get out coz size too small. Too big & too small will still left some smoke in the office. The engineers at my office calculated the office sqft to staircase sqft before even moving into HP Towers to ensure the ratios are correct.
In engine terms they call it gas recycling, if still got some smoke left in your cylinder, when inlet valve open and your air la, fuel la get mixed up with the balance smoke la, your burning will kantoi. Your engine will still run no problems but not at optimum levels.
ATW Horsepower to pipe size; remember its ATW hp ar.
200 > 2.50
190 > 2.45
180 > 2.40
170 > 2.35
160 > 2.30
150 > 2.25
Some people in US already did this study, so wut i saying is nothing new. So Ken, u see la u dyno your car how first than maybe you can change piping. But since you already did your piping, dont waste it please, mod your engine to 200+HP like Bear than your car sui liao.
I believe this is true coz I remember 1 night i run with another prelude driven by an Indian, piping damn huge damn noisy. And oso want to run with me but somehow he could not keep up with me. I still using stock exhaust ma. How come ar I can win? After check check check, than I know why....too big doesnt mean very fast.
