cam degreeing confusion
#1198006
03/16/12 04:30 PM
03/16/12 04:30 PM
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Joined: Dec 2004
Posts: 118 South Jersey
JerseyJoe
OP
member
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OP
member
Joined: Dec 2004
Posts: 118
South Jersey
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I'm using intake centerline method, when measuring at .050 valve lift does my dial need to be on the lifter or can it be on the valve retainer(factoring in my 1.5 ratio rockers)? I keep coming up with the same TDC but @ .050 (dial on the valve retainer) I'm not getting anywhere near the 106 centerline on the cam card. Any help is appreciated, Joe
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Re: cam degreeing confusion
[Re: JerseyJoe]
#1198008
03/16/12 06:17 PM
03/16/12 06:17 PM
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Joined: Aug 2003
Posts: 43,195 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
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Quote:
I'm using intake centerline method, when measuring at .050 valve lift does my dial need to be on the lifter or can it be on the valve retainer(factoring in my 1.5 ratio rockers)? I keep coming up with the same TDC but @ .050 (dial on the valve retainer) I'm not getting anywhere near the 106 centerline on the cam card. Any help is appreciated, Joe
checking the LSA can be done on the lifter or the retainer, checking the CAM SPECS. can ONLY be done on the lifter as that is what the cam grinder bases their specs on, cam lift at the liter, not at the retainer I like to do the LSA at the retainer as the motor knows what the valves are doing, it doesn't know what the lifter is doing The rocker ratio will make all the cam specs. read at the retainer wrong be the amount of the ratio, IE 1.5 ratio will have more lift and duration at the retainers than at the lifters, a 1.8 ratio will have even more BTW, I like to check the LSA on the exhaust sides to verify that the intake side and the exhaust sides are truly ground like the cam card calls for, IE if straight up on a 110 LSA both lobes should be in at 110, if advanced two degrees on the intake, in at 108 ATDC then the exhaust should be in at 112 BTDC IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: cam degreeing confusion
[Re: JerseyJoe]
#1198009
03/16/12 06:59 PM
03/16/12 06:59 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
I'm using intake centerline method, when measuring at .050 valve lift does my dial need to be on the lifter or can it be on the valve retainer(factoring in my 1.5 ratio rockers)? I keep coming up with the same TDC but @ .050 (dial on the valve retainer) I'm not getting anywhere near the 106 centerline on the cam card. Any help is appreciated, Joe
if you have a true 1.5 rocker multiply .050x1.5 and thats the cam lobes .050 number at the valve. you cannot check duration, lift, or anything for that matter using a hydraulic lifter. best, and simpiliest is check at the lobe.
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Re: cam degreeing confusion
[Re: 440newport]
#1198012
03/17/12 05:51 PM
03/17/12 05:51 PM
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Joined: Oct 2005
Posts: 8,873 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,873
Ontario, Canada
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Forget about the rocker ratio, it is totally insignificant. Measuring at the retainer all you want to do is make sure whatever reading you take on the upstroke is the same on the downstroke. So, if you use .075 on the upstroke, use .075 on the downstroke.
Now, since all this is dependent on an accurate TDC, how did you do that with the heads on?
And if you're checking at the retainer, make damn sure the shafts are bolted down tight.
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