PTV results?
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PTV results?
For anyone who cares, I degreed in and mocked up a motor this am for a customer and here are some ptv results fwiw.
2001 LS1 block
AFR 205 heas (unmilled)
-.007 deck clearance
3.930/.040 cometic
235/242 .621/.610 111+1 (LSL/XER)
cam in @111.25 ICL and 31* @.050 IVO and 6.5* .006 IVO
Checked with solid lifter/soft springs and stock rockers!
PTV clearance= .082 intake .151 exhaust
Hope this helps anyone, Joe
2001 LS1 block
AFR 205 heas (unmilled)
-.007 deck clearance
3.930/.040 cometic
235/242 .621/.610 111+1 (LSL/XER)
cam in @111.25 ICL and 31* @.050 IVO and 6.5* .006 IVO
Checked with solid lifter/soft springs and stock rockers!
PTV clearance= .082 intake .151 exhaust
Hope this helps anyone, Joe
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2002 LS1
Stk Heads
Stk GM Head gaskets
Std. Deck (-.006 to -.008)
Crane 236/242 .600/.609 110+2 (HR5/HR5 Lobes)
Cam RETARDED 2.5* 110.5 ICL (for livable ptv, A4 car) needs cut imo.
PTV results= .041 intake w/cam installed straight up
.052+ intake, & can't remember on exhaust, but was ok .100+?
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I will post up some Crane LS1 "quick lift" rocker cam timing results, compared to a stock LS1 rocker also. Lets just say, PTV is on issue when switch from stk rockers to a Crane? (depending on cam design) lol
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I hear you. I didn't check that, but maybe next time I will though. Most people DON'T know how to check PTV correctly anyways from what I see. Heres another one for you.
2002 LS1
Stk Heads
Stk GM Head gaskets
Std. Deck (-.006 to -.008)
Crane 236/242 .600/.609 110+2 (HR5/HR5 Lobes)
Cam RETARDED 2.5* 110.5 ICL (for livable ptv, A4 car) needs cut imo.
PTV results= .041 intake w/cam installed straight up
.052+ intake, & can't remember on exhaust, but was ok .100+?
2002 LS1
Stk Heads
Stk GM Head gaskets
Std. Deck (-.006 to -.008)
Crane 236/242 .600/.609 110+2 (HR5/HR5 Lobes)
Cam RETARDED 2.5* 110.5 ICL (for livable ptv, A4 car) needs cut imo.
PTV results= .041 intake w/cam installed straight up
.052+ intake, & can't remember on exhaust, but was ok .100+?
To me, this is a worst-case scenario with the lifter innards fully extended and pushing the valve stem into contact with the piston. What other way is there to do this?
Russ
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OEM LS6 block with TFS 215's milled to 60cc with 232/236 .595/.578 113+3 (installed 110 ICL) At 11 ATDC we had about 0.040-0.045 on intake....decided to flycut intake side 0.090 for sufficient clearance!
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I did mine with a checking spring, solid lifter, stock rocker, dial indicator, and an adjustable pushrod. L92 heads, milled .030" on an LQ9 short block.
Its a Comp LSR 219/235 .607/.621 113 +4, I paid extra for Comp to Adcole it for me. So I know exactly how its ground.
I had .090" on the intake and .085" on the exhaust. Im glad I didnt mill them anymore!
Its a Comp LSR 219/235 .607/.621 113 +4, I paid extra for Comp to Adcole it for me. So I know exactly how its ground.
I had .090" on the intake and .085" on the exhaust. Im glad I didnt mill them anymore!
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Please do, I was doing some research on them and I'm very interested in seeing how the "Quick Lift" design affects PTV. Especially since I'm strongly considering purchasing a set of them in 1.7 ratio for my car, with a setup that I'm wary to push the clearance limits of much farther.
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Please do, I was doing some research on them and I'm very interested in seeing how the "Quick Lift" design affects PTV. Especially since I'm strongly considering purchasing a set of them in 1.7 ratio for my car, with a setup that I'm wary to push the clearance limits of much farther.
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Please do, I was doing some research on them and I'm very interested in seeing how the "Quick Lift" design affects PTV. Especially since I'm strongly considering purchasing a set of them in 1.7 ratio for my car, with a setup that I'm wary to push the clearance limits of much farther.
Why wouldnt you just get a cam designed with fast ramp rates? It makes it sound like "quick lift" rockers are made to help slow ramped stock camshafts.
What happens whey you put quick lift on a cam with a agressive ramp?
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I never understood "quick lift". Excuse my ignorance...
Why wouldnt you just get a cam designed with fast ramp rates? It makes it sound like "quick lift" rockers are made to help slow ramped stock camshafts.
What happens whey you put quick lift on a cam with a agressive ramp?
Why wouldnt you just get a cam designed with fast ramp rates? It makes it sound like "quick lift" rockers are made to help slow ramped stock camshafts.
What happens whey you put quick lift on a cam with a agressive ramp?