Degreeing a cam on an LS1
11-28-2005, 09:15 PM
#1
Degreeing a cam on an LS1 I've got everything setup to degree the cam in my solid roller motor. I have the wheel set to find 0 @ TDC now really all I need to do is monitor .050 lift and make sure the timing is correct. Question is what is the best way to look @ .050 lift. If you measure it @ the pushrods its only going to show lobe lift. The .050 is the rocker lift. Any tips for this simple process is appreciated.
Phil
Phil
11-29-2005, 02:34 PM
#7
yeah, it should be lobe lift. Spin the crank by hand and there should be some amount of time where the lifter isn't showing anything on the indicator. This should be your base circle. now turn the crank over until you see .050" of lifter rise. Mark the wheel (or write it down) continue until you reach peak rise (note that down too) then continue until you register .050" above base circle lift.
You can multiply your peak measured lift times your rocker ratio (1.7 for stockers) to get your maximum lift.
I just read that your needle should be in parallel with your valves, otherwise you throw some geometric errors into the mix. I'm going to re-degree my cam for ***** and giggles tonight or tomorrow, I'll see if it makes a difference.
check out this link: http://compcams.com/Technical/Instru.../Files/145.pdf
You can multiply your peak measured lift times your rocker ratio (1.7 for stockers) to get your maximum lift.
I just read that your needle should be in parallel with your valves, otherwise you throw some geometric errors into the mix. I'm going to re-degree my cam for ***** and giggles tonight or tomorrow, I'll see if it makes a difference.
check out this link: http://compcams.com/Technical/Instru.../Files/145.pdf
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11-30-2005, 08:14 AM
#8
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Phil, you can also use one of these.
http://www.powerandperformancenews.c..._Code=CAMSHAFT
But, you need to take into consideration that .050 lift at the valve is ~0.0294 at the lobe assuming a perfect 1.7 ratio (which the LS1 isn't).
http://www.powerandperformancenews.c..._Code=CAMSHAFT
But, you need to take into consideration that .050 lift at the valve is ~0.0294 at the lobe assuming a perfect 1.7 ratio (which the LS1 isn't).
11-30-2005, 07:09 PM
#9
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Another check is if you find the crank angle where the lift points are say 0.010" less than peak, before and after the max lift point, then the cam centerline is halfway between these angles and can be compared to the card spec. Also, even if you screw up the actual 'X' thous lift points, as long as it's at the same lift opening as closing, you can tell the cam is in right if the 'error' is the same both sides (e.g., opens 4 degrees later than the card says, but closes 4 degrees earlier = exactly right.)
12-01-2005, 08:03 AM
#11
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Originally Posted by slow3hoe2
why do you need to find .050 lift? all you are verifying is that the intake centerline is where its supposted to be...right? maybe im doing it a different way...but its super easy.
Or you can line it up with valve events @.050 in crank degrees. The latter is suppost to be more accurate.
12-01-2005, 11:19 PM
#12
Originally Posted by wrencher
You can line it up that way w/ the centerlines.
Or you can line it up with valve events @.050 in crank degrees. The latter is suppost to be more accurate.
Or you can line it up with valve events @.050 in crank degrees. The latter is suppost to be more accurate.
