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Ok, I have a question for anyone who is good at math. Can the time be measured that a piston spends completely stopped at the top and bottom of the cylinder when running.? At 10,000 I'd bet it's not too long!

lippy..........i agree

Send me your email address and I will send you an excel program called piston motion I downloaded. Enter the data about your combo and it will calculate where the piston is at any crank degree angle.

Bob, I don't want to know where it is, I want to know for what amount of time it's there. The laws of physics say that in order for something to change direction there is a point in time it must come to a complete stop to change direction. Any ideas? I want to know how long it is stopped at a certain RPM. ???????????

I can tell ya from sperinz that if you change directions many times at a hi rate of speed you can throw your back out

Jim, this little idea stems way back to when I was a teenager working on my 55 chevy race car. I had built a little punched out 283 chev, a 292, I was running 5.57 gears in an olds rear with a 4spd, I'd shift it about 8500, and I was tellin my Dad one day out in the shop It had a small miss at times, he said, you'd miss too if you were running that kind of speed!, then he said, you know, those pistons hafta make a complete stop at the top and bottom of the cylinders to change direction. Then he said, How long do ya figure they're stopped.? Then he walked away, suddenly I realized I was lucky a miss is all I had!

a few years back when i first got online with web tv and found draglist message board i thru a math question up that went something like this; Supposing a top fuel car leaves the starting line @ 8000 rpm and the clutch management keeps the rpm constant throughout the run and the et is 4.75 , how many times did the number 1 cylinder fire over the coarse of the run???? most of the replies on the board were accurate. But ask this question to the fan in the bleachers holding a draft beer and it's unbilievable the answers you will get

Yeah, its like 633 times, at first thought you say, oh man it's gotta be eighty gozillion! I never was a math wiz, knew just enough to figure a six pack in change!

not anykind of math wiz....but the answer to the question is certainly going to be in milliseconds, Lippy.....perhaps even micro-milliseconds....specially at higher rpm's.........

Billy, I've got some engine builder math wiz types on this deal, I'll post answers when I get em!