Snake
Mopar Nut
Well just got the 360 back from the machine shop they degreed the cam it was 4 degrees retarded,so he said he installed it at 1 degree retarded.the cam card said 4 advance.
Degree a camshaft.
- Thread starter Snake
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rigger3006
Well-Known Member
wtf? or was that 4 advance ground into the cam already, one would think they would install it correctly
Sometimes if you want things done right..you have to do it yourself..
Where is it set? What degree is the intake lobe Centerline??? Then compare that to the cam recommendations...
Ok , what's the cam brand and spec info. So we can see what the shop did in relation to what's actually on the cam card.
Snake
Mopar Nut
This is the cam card
nm9stheham
Well-Known Member
That cam has 4 degrees of ground in advance. So if it is installed 'straight up', then it will be 4 degrees advanced. If they installed it with the ICL 1 degree retarded, then it is 5 degrees retarded from 'as designed'. It will considerably lower your low RPM torque .
I would surely take it back to be done right.
I would surely take it back to be done right.
What number did he give you that the intake center line was at.? Did he say I/C is at 105? or 109?
Snake
Mopar Nut
All i know he said it was 1 retarded and as the chain stretches it will go to 0.
Ummmm, no as the chain stretches it will RETARD further...
Ask him what the installed centerline is. If he can't answer that he didn't do the work is my guess.
Find a new machine shop. Snake, learn to do this YOURSELF bud. It's grammar school geometry.
Are you sure that's what was said? Ask again. The theory is right about the chain relaxing a degree, but was this instead is what was said "the cam will retard its self a degree because of chain stretch and then the timing will become zero". The word retard placed in the wrong context and we've got a totally misunderstood meaning.
Snake
Mopar Nut
Ok will call Monday morning.From the cam card it should of had 4* advance right.Thats great for top end power,and retard is for bottom end power ,right or am i wrong.
nm9stheham
Well-Known Member
You have it backwards.... advance for low RPM torque....And CB is correct on the cam timing retarding more as the chain stretches.
Snake
Mopar Nut
OK just what should i ask him Monday to get this cleared up.
Ask .. What is my intake centerline set at? Or.. What did you degree my intake centerline at?
Snake
Mopar Nut
Got it.
nm9stheham
Well-Known Member
Ask him what the intake centerline (ICL) was, as he installed it and measured it with the degree wheel. A 106 installed ICL would put this cam timed with the 4 degrees of ground-in advance. If he really installed it 1 degree retarded, the measured ICL would be 111 degrees.
(And not to confuse things but to be complete in explaining, ICL is measured after top dead center of the exhaust stroke... ATDC.)
(And not to confuse things but to be complete in explaining, ICL is measured after top dead center of the exhaust stroke... ATDC.)
I would ask him at what degree after TDC the intake centerline is at, not how far advanced or retarded, you can figure that out from the cam card info...
Yes, advance gives more low end and a little less top end, retarded gives more top end but less low end...
Snake
Mopar Nut
JUST called he says it is set at 105.
nm9stheham
Well-Known Member
OK, that is 5 degrees cam advance, which 1 degree beyond the ground-in advance. I would leave it as is. (After I rechecked it myself of course; I rechecked a bunch of stuff after the machine shop and caught 1 big mistake and one moderate mistake in our last build.)
The 105 degree that the shop set it at will relax when the chain wears in and will then become the 106 that the specifications sugest.
Snake
Mopar Nut
Case closed,just snake getting things all F678 UP. I sometimes dont here what i should here.
nm9stheham
Well-Known Member
You have a great attitude, guy... my hat is off to you.
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