top end

prove me wright or wrong
now we can retard or advanse the timing of the valves openinig and closing throgh the timing chain via the cam sproket
and we can adjust the ignition timing of the sparks advansed and retarded

now do those two adjustments relate to each other in term of adjusting
as if i advansed the cam the ignition will be advansed automatically
or both are being done separately

THANKS IN ADVANSE

Third Gear

iTrader: (3)

Yes, you can advance timing relative to the crankshaft with an adjustable timing set. Otherwise one tooth +/- is way more advance or retard than you would want. Also when fooling with the cam timing it's good to degree it in. Trust me, it has saved me from making a mistake.

Ignition advance is controlled by the VCM, so if you want to mess with that you need to have it tuned, or pick up a program like HP Tuners or LS1 Dead It... I mean LS1 Edit.

top end

thanks for your reply navySS

whan we advanse the ignition or the cam we put the power band in the top rpm
and when we retard it the power band will be in the mid low range
is this right
and another thing does advansing gives more power than retarding in the peak output and in better in drag racing

top end

thanks for your reply navySS

whan we advanse the ignition or the cam we put the power band in the top rpm
and when we retard it the power band will be in the mid low range
is this right
and another thing does advansing gives more power than retarding in the peak output and in better in drag racing

Third Gear

iTrader: (3)

No problem. Usually the more advance a cam has will make the engine more responsive down low, and make more power in the low to mid range. This will hurt the top end some.

Retarding the cam is just the opposite. Power and throttle response won't be as good as with the cam advanced, although this will help top end power.

I'd ask the cam manufacturer what they think is best. My thoughts are If you're drag racing, a little low end loss wouldn't hurt. Most cams are ground with 4 degrees of advance. Some people install them at +2 or even "straight up" that's no advance or retard.

To sum it up: retarding a cam shifts the powerband up. Advancing it brings it down. If it's a real lumpy cam it will need that 4 degrees of advance to help it idle.

top end

i think you reversed the advansed retared effect
because it is reversed ??

thanks again for your help

Third Gear

iTrader: (3)

That's correct: advancing a cam helps down low, retarding helps up top.


http://www.compcams.com/Technical/TimingTutorial/