Cam is retarded...... Degreeing
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
Cam is retarded...... Degreeing
Funny one liner I think..
Well Im degreeing my cam and the lifter (op) event is 8 degrees and I got 5-6 degrees. Is there something I can do it fix this? Do I have to redo my timing chain? Find TDC again and try again?
Well Im degreeing my cam and the lifter (op) event is 8 degrees and I got 5-6 degrees. Is there something I can do it fix this? Do I have to redo my timing chain? Find TDC again and try again?
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
I have the Open @ 5 and my Close @ 41. Given the math
5 Open + 41 Close + 180 = 226. And on my timing card I have a duration of 226. Did my cam builder purposely build it to be retarded?
5 Open + 41 Close + 180 = 226. And on my timing card I have a duration of 226. Did my cam builder purposely build it to be retarded?
Race Director
Joined: Jan 2002
Posts: 12,263
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From: O'Fallon Missouri
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
Yes this is a custom cam from Lloyd Elliot.
Here is what I did... I verified TDC with a Dial Micrometer and installed the degree wheel at 0 degrees with a pointer attached to block. I then put the Micrometer on the intake lifter. Set liftert to its lowest point then I set the dial to zero. I turned clockwise to .050 on the gauge. Giving me my number.
Here is what I did... I verified TDC with a Dial Micrometer and installed the degree wheel at 0 degrees with a pointer attached to block. I then put the Micrometer on the intake lifter. Set liftert to its lowest point then I set the dial to zero. I turned clockwise to .050 on the gauge. Giving me my number.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
I got about 7-8 degrees this time, I think the first time I just read it wrong( when I said 5-6 degrees) Cause that marker is from my first attempt.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
ok, i'm baffled
need more time to mull over this, probly not a big effect on your 'opening' point since that's so near TDC (where you set your 'indicate' wire), but your degree wheel is NOT centered...'might' (?) mess the 'closing' reading and other reads not near TDC or BDC.
Drifting
Joined: Mar 2008
Posts: 1,756
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From: Wichita KS
It also looks like you have your indicator inside the lifter where the plunger can move. Instead, try putting the indicator on the edge of the lifter.
Everyone has a different way to degree cams. I prefer the intake lobe center-line degree. That way I can tell people my cam is set on 110 degrees intake center-line.
EDIT: When you bucked in TDC to zero your degree wheel. Did you turn the crank clockwise to TDC and mark the degree wheel. Then turn the crank counter-clockwise to TDC (on the indicator) and mark the degree wheel. Then split the difference and put your pointer there at zero?
I hope that makes sense. Someone in an earlier post stated using a positive piston stop to prevent the piston from reaching TDC was a better way. I've done both with the same results. It's quicker to use a positive stop. In both cases you want to spin the crank in both directions and split the difference to set the pointer at zero on the degree wheel. You loosen the degree wheel and turn it rather then bend the pointer.
Everyone has a different way to degree cams. I prefer the intake lobe center-line degree. That way I can tell people my cam is set on 110 degrees intake center-line.
EDIT: When you bucked in TDC to zero your degree wheel. Did you turn the crank clockwise to TDC and mark the degree wheel. Then turn the crank counter-clockwise to TDC (on the indicator) and mark the degree wheel. Then split the difference and put your pointer there at zero?
I hope that makes sense. Someone in an earlier post stated using a positive piston stop to prevent the piston from reaching TDC was a better way. I've done both with the same results. It's quicker to use a positive stop. In both cases you want to spin the crank in both directions and split the difference to set the pointer at zero on the degree wheel. You loosen the degree wheel and turn it rather then bend the pointer.
Last edited by Ryan59; Mar 8, 2009 at 09:24 PM.
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Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
This time I did my measurements by the recommendation on the cam card.
1) Find TDC set dial to 0
2)With dial on rotate engine til lifter is at highest point.
3) Set dial to 0
4)Turn to left to you reach .050 than record number.
5)Return crank to 0
6)Turn to right til you reach .050 than record number.
7) Add the numbers divide by 2 and this gives you centerline.
My numbers were 63 and 145 giving me 208 divide by 2 = 104
My cam card says degree intake lobe to 105.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA