this last weekend with my friends idea and armed with a HCI mag and a repair book i advanced my cam timing by 7.2 degress roughly, intake and exhust. simply by moving the chain one tooth on each. the result. is a crap load of low end torque. the Mag helped me on taking it apart and seting the chain ten. oh i have the ECOTEC by the way. this was my friends idea. and i got the 7.2 degrees by counting the teeth then divding 360 by that number. 360/50= 7.2 now when i lay on it from a roll i can brake the tires loose @ roughly 3000rpms. now it is about 6 degrees here and my tires are pretty shot. so you may all think that is not much. but i do feel a different, i haven't dynoed it or raced it so i don't know if it helped or hurt me. what do you guys think about this.
I say you'll be looking at a set of valves in not even a month.
Gilles
2.3 Ho
^^^ lol, not wishing you that but my valves crapped when my mechanic incorrectly timed my performance cams. oh they took out some of my pistons too
15.574 @ 89 mph stock
btw, usully, you advance the Intake cam and retard the exhaust cam.
Now all you did is really messed up the timming. Even on a 2.3 Ho with the biggest cam you can find, you only move the timming 4degres so good luck on your engine build up.
Gilles
2.3 Ho
even if it's stock, that's too much timming. I don't want to burst you bubble but you're plying with fire.
It's not only the lift and duration that count but the pistons too. They are coming up while you're opening the valve so bad thing happen.
Unless you did it on an engine that is in your garage and turn the crank by hand and take mesurement for the clearance, you will have trouble.
Don't be hard on it.
Gilles
2.3 Ho
i did do that i made sure there was no problems, let it idel. slowly reved it up. slowly. no odd nosies. sounded normal
my wheels would spin, from a roll, when its cold out here too and i didnt touch my timing. i would say its the worn tires doing that
MY 2003 SUNFIRE 15.6@86mph
"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001
RAKSJ04 wrote: and i got the 7.2 degrees by counting the teeth then divding 360 by that number. 360/50= 7.2
I counted the teeth on the pictures of the GMperformance gears and I only see 46 teeth.
But beyond that, Cams rotate at 1/2 crank speed. So the rotation is based on 720 degrees not 360.
All measurements are based on CRANK degrees, so by your math you moved them 3.6 degrees. By my # its 3.9 degrees.
sig not found
oh ok. i see.sorry my math was a little off. never calulated even thing like that before
