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Old 01-21-2011, 06:29 AM
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Retarding my cam

i just installed my isky 280 mega cam. and i went with the 2 degrees retard for a lil more top end. my power band is 2500 to 6500 rpm,so i figured i might as well use it up high. before i finish the motor should i get a little more retard out of it or standard or advance? ill be running a 3000rpm stall in a pretty light car. cams and timing are def. not my strongest subjects. it will be for the track and the track side of street. lol
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Old 01-21-2011, 07:14 AM
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i want to hear this, i'll be waiting
ive been wondering about advancing mine
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Old 01-21-2011, 07:47 AM
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Quote:
Originally Posted by matts37chev
i want to hear this, i'll be waiting
ive been wondering about advancing mine
from what i understand advancing gives you a littlemore torque in the low end and vice versa.
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Old 01-21-2011, 07:50 AM
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Renamed the thread from simply "retard". It doesn't do anything for the search features of the board or provide any information about your question.
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Old 01-21-2011, 08:01 AM
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Since you mentioned it SS I wish I coulda seen it before you changed it,, I`m still laughing lol.
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Old 01-21-2011, 09:13 AM
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Did you verify the cam timing first?, using a degree wheel,piston stop and dial indicator?
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Old 01-21-2011, 09:41 AM
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Quote:
Originally Posted by crankshaft3rd
i just installed my isky 280 mega cam. and i went with the 2 degrees retard for a lil more top end. my power band is 2500 to 6500 rpm,so i figured i might as well use it up high. before i finish the motor should i get a little more retard out of it or standard or advance? ill be running a 3000rpm stall in a pretty light car. cams and timing are def. not my strongest subjects. it will be for the track and the track side of street. lol
You need some compression to make it happy. And you need a lot of initial ignition advance.

I see no need to juggle the cam phasing- especially if you don't know where you are starting from. The only way to make an intelligent guess at this is to first degree the cam. Otherwise, just install it straight up.
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Old 01-21-2011, 11:24 AM
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Quote:
Originally Posted by crankshaft3rd
from what i understand advancing gives you a littlemore torque in the low end and vice versa.
Advancing the cam promotes low end torque. Retarding it makes the IVC event later which promotes high RPM.

I'll say this just to be a stick in the mud... I have always played around with advance/retard, but as Joe Mondello himself once told me... if you have to advance or retard your cam to tune your powerband, you picked the wrong cam.

Having said that, I modify his words... if you have to advance or retard more than 2 degrees, you picked the wrong cam.
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Old 01-22-2011, 09:19 AM
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thanks guys i actually looked into it alot last night and decided im going to just go straight up no adv, or ret,
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Old 01-22-2011, 02:23 PM
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Quote:
Originally Posted by matts37chev
i want to hear this, i'll be waiting
ive been wondering about advancing mine
if i advance my cam will it make it more low comp./pump gas friendly?
i already know that by have it in a 496 will calm it down some, but how much?
what would be the overall effects of advancing it and having it in a 496?
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Old 01-22-2011, 02:37 PM
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Actually, the opposite will happen, all else being equal. But a lot depends on what your static CR is to begin with.

When you advance a cam, it tends to trap more air because of the earlier closing intake. This will cause the overall cylinder pressure to be greater than if not advanced, so detonation could occur easier. And I believe the cam is ground w/advance already.

But besides any of that, your cam is small for that big of an engine. It will have uber torque as-is, I wouldn't change the phasing unless it is to correct any error found when you degree it in.
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