Re: Degreeing a cam with asymmetrical lobes
[Re: dvw]
#3022054
03/08/22 08:13 PM
03/08/22 08:13 PM
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Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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You'll never no what's best unless you try different spots. Doug This. Unless you put it in, measure it, test it, change it and test again, it is just a fruitless weedy discussion. Thinking that the recommended centerline is actually the best centerline is a bit of a stretch, let alone argueing about 0.050", 0.200" or 0.050" over the nose methods, IMO. My Com Cam instructions says to use over the nose equal amounts, fwiw.
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Re: Degreeing a cam with asymmetrical lobes
[Re: mopar dave]
#3022061
03/08/22 08:20 PM
03/08/22 08:20 PM
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Joined: Jan 2007
Posts: 8,043 Mt Morris Michigan
mopar dave
OP
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OP
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Joined: Jan 2007
Posts: 8,043
Mt Morris Michigan
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Machine shop was busy, so i installed the exhaust valve, checking margin with blue dykem or whatever its called. Looked good to me as well as the install height being the same, so mounted the head back up and remeasured with checking springs. I get .051 on intake and .088 on exhaust. Cam is in at 105. Looks like the best i'm gonna do, but maybe a 1.5 rocker would get me a bit more clearance as Dwayne suggested. The valve events measured are as i stated before, intake open 29 close 57, exhaust open 71 close 29.5. The exhaust closing point is off by 4* not sure why as the other events are 1.5* different. Intake atdc Exhaust btdc 0*-.082 0*-.120 5*-.057 5*-.097 6*-.056 6*-.092 7*-.051 7*-.090 8*-.052 8*-.088 9*-.052 9*-.088 10*-.054 10*-.089 15*-.070 11*-.090 I will install the roller springs and remeasure again with clay tomorrow.
Last edited by mopar dave; 03/09/22 08:48 AM.
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Re: Degreeing a cam with asymmetrical lobes
[Re: Diplomat360]
#3022203
03/09/22 05:27 AM
03/09/22 05:27 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Aurora, Colorado
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Also, bullet says not to use the lifter bore tool for measuring any cam specs. If roller, must use a lifter because of the wheel size. Mine are .810 wheels. Doing this does seem to get more accurate measures. Uh-huh...couldn't agree more...that fancy looking CompCams tool caused me a massive headache as I attempted to degree my mild hydraulic roller. Eventually, degreeing off of an actual roller lifter got me the matching numbers. Agree. The Comp lifter bore tool is good for centerline method where lifter diameter / roller size just needs to be the same on each side of max lift, but not good for open/closing events. For opening / closing events use the lifter that will be run.
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Re: Degreeing a cam with asymmetrical lobes
[Re: mopar dave]
#3022226
03/09/22 09:25 AM
03/09/22 09:25 AM
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Joined: Jan 2003
Posts: 16,929 NC
440Jim
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I Live Here
Joined: Jan 2003
Posts: 16,929
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Interesting. I never saw a cam card with different rocker ratios. 1.6 on the intake and 1.5 on the exhaust. 0.430 x 1.6 = 0.688 0.430 x 1.5 - 0.645 Typically I had to calculate the lift for the ratio I am using if the cam card was for 1.5.
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Re: Degreeing a cam with asymmetrical lobes
[Re: mopar dave]
#3022446
03/09/22 07:03 PM
03/09/22 07:03 PM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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Joined: May 2011
Posts: 4,489
northern,Ohio,USA
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Its cool, just want to be clear. The clay measure was kind of a bust. I measured .114 on intake and .122 on exhaust using clay. Not sure why, the clay is firm and not spongy at all. I'm done measuring. Its now time to get this back together. Thanks guys So your radial clearance was good also?I know if the clay is laid too thick it will curl around the valve when pressed.
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