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Thread: Surfaced Head and Adjustable Cam Gears Reply to Thread
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Topic Review (Newest First)
02-13-2013 12:11 AM
amc49 I used to dial in cams by max compression too, an old trick.
02-12-2013 11:44 PM
ZXthrizzle05 when I was NA my mods were just svt header and cold air intake.
02-12-2013 03:00 PM
freemind I've got a factory freak on my hands.
02-12-2013 09:39 AM
ZXthrizzle05 Your numbers are a tad higher than mine and I had stock gears when I was NA
02-12-2013 01:34 AM
freemind x's on the Dyno. I got 17 ftlbs more in the midrange.

Money well spent.
02-11-2013 11:33 PM
ZXthrizzle05 damn, i like just using my tdc pin and bar
02-11-2013 09:35 PM
sdaddy
Quote:
Originally Posted by amc49 View Post
The discussion is a moot point, he probably read the degrees difference on the sprocket markings, irrelevant since the reason for the adjustable sprockets to begin with. You correct with them back to right, or what you want. There is no way to 'confirm' since every engine will be slightly different. The term '5 degrees' also useless unless knowing retard or advance and which one of two cams.

The TDC mark can be useless too since may not be true TDC which needs to be indicated out with a degree wheel. Simply bumping a stop point pin is close but all engines vary there too.
Yes, you're right. I did mean the degree difference on the sprocket markings when the cam's are aligned via the tool. I checked TDC by using a the measuring end of a caliper on #1 piston and it corresponds to hitting the stop point pin. The adjustable sprocket markings are actually both 6 degrees retarded. I'll start with that and follow Tom's compression advice for the initial tuning.
02-11-2013 10:52 AM
1turbofocus Correct , the best thing to do is get them close with the tools for TDC then use a compression gauge to dial them in closer till you can get to a dyno

Do a compression test , then move one gear 1 mark , if compression goes up go another mark till compression stops going up by moving the gear , if you go Adv. say and get no gain in compression then go the other way , when done with that gear go to the other and do the same thing , this will get you CLOSE but you need to adjust the gears on a dyno or you may leave some power behind

Tom
02-11-2013 04:29 AM
amc49 The discussion is a moot point, he probably read the degrees difference on the sprocket markings, irrelevant since the reason for the adjustable sprockets to begin with. You correct with them back to right, or what you want. There is no way to 'confirm' since every engine will be slightly different. The term '5 degrees' also useless unless knowing retard or advance and which one of two cams.

The TDC mark can be useless too since may not be true TDC which needs to be indicated out with a degree wheel. Simply bumping a stop point pin is close but all engines vary there too.
02-11-2013 12:26 AM
ZXthrizzle05 how did you know you were 5 degrees off?
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