06-04-2009, 09:33 AM
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#11 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: North East
Posts: 6,203
Drives: 09 370Z Sport M6
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Quote:
Originally Posted by g96818
are you high? if i'm reading this right, u're saying to ignite the fuel before TDC so that force will be applied to the piston head in the opposite direction of travel  |
Yes, you ignite the fuel before TDC. It takes time for the spark to ignite the fuel and complete the burn, so with a piston traveling at 150mph you must account for this delay and fire early. Obviously the goal is as you described, to have maximum gas expansion right after TDC, but to get there you have to start before.
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