Q needs an A
Thread Starter
Teching In
Joined: Jan 2005
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Q needs an A 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
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
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.
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.
Thread Starter
Teching In
Joined: Jan 2005
Posts: 14
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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
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
Thread Starter
Teching In
Joined: Jan 2005
Posts: 14
Likes: 0
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
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
Originally Posted by 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
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
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.
Originally Posted by top end
i think you reversed the advansed retared effect
because it is reversed ??
thanks again for your help
because it is reversed ??
thanks again for your help
http://www.compcams.com/Technical/TimingTutorial/
Originally Posted by Comp Cams
Figure 1 shows a normal 270 degree cam. It has a lobe separation of 110°. We show it installed in the engine 4° advanced, or at 106° intake centerline. The light grey curves show the same camshaft installed an additional four degrees advanced, or at 102 degrees intake centerline. You can see how much earlier overlap is taking place and how the intake valve is open a great deal before the piston starts down. This is usually considered as a way to increase bottom end power, but as you can see there is much of the charge pushed out the exhaust, making a less efficient engine.
