Cam advance and timing chain question
Thread Starter
Le Mans Master
Joined: Jul 2005
Posts: 7,121
Likes: 3
From: Shreveport/Bossier Louisiana
St. Jude Donor '08
Cam advance and timing chain question
I pulled my cam (234/243 .601 .610 114+4) out last night and on double roller timing chain the crank sproket has the +4 facing strait up and the cam sproket has the dot facing directly down.
With my cam specs above, does that mean that the cam has no advance ground into it and they only advanced it through the timing set, or both?
Thanks guys
With my cam specs above, does that mean that the cam has no advance ground into it and they only advanced it through the timing set, or both?
Thanks guys
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
How do you know those are the specs? This is not an LG cam correct?
I seem to recall on another post of yours that it was a custom ground cam and those were the specs documented by the engine builder. If that is the case, the cam may be ground straight-up (no advance), and they advanced it 4* during install, and then documented the engine specs as such.
I'm finding it tough to believe they would custom order a +4 advance, and then advance it another 4* to set it at 106 ICL.
I seem to recall on another post of yours that it was a custom ground cam and those were the specs documented by the engine builder. If that is the case, the cam may be ground straight-up (no advance), and they advanced it 4* during install, and then documented the engine specs as such.
I'm finding it tough to believe they would custom order a +4 advance, and then advance it another 4* to set it at 106 ICL.
Thread Starter
Le Mans Master
Joined: Jul 2005
Posts: 7,121
Likes: 3
From: Shreveport/Bossier Louisiana
St. Jude Donor '08
How do you know those are the specs? This is not an LG cam correct?
I seem to recall on another post of yours that it was a custom ground cam and those were the specs documented by the engine builder. If that is the case, the cam may be ground straight-up (no advance), and they advanced it 4* during install, and then documented the engine specs as such.
I'm finding it tough to believe they would custom order a +4 advance, and then advance it another 4* to set it at 106 ICL.
I seem to recall on another post of yours that it was a custom ground cam and those were the specs documented by the engine builder. If that is the case, the cam may be ground straight-up (no advance), and they advanced it 4* during install, and then documented the engine specs as such.
I'm finding it tough to believe they would custom order a +4 advance, and then advance it another 4* to set it at 106 ICL.
On my build sheet from LME it says the specs I posted aboveThats what I was getting at....I find it very hard to believe that they would grind +4 in and then advance it 4 degrees more on the install. I think its ground strait up, I may have to call em and verify
Thread Starter
Le Mans Master
Joined: Jul 2005
Posts: 7,121
Likes: 3
From: Shreveport/Bossier Louisiana
St. Jude Donor '08
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Thread Starter
Le Mans Master
Joined: Jul 2005
Posts: 7,121
Likes: 3
From: Shreveport/Bossier Louisiana
St. Jude Donor '08
The outside numbers on the the crank sproket are right on the teeth and the inside numbers on the crank sproket are between teeth. The dot on the cam sproket was lined up with the +4 on the inside number.
I did, however, just talk to Cam Motion and they said they usually grind 4 degrees of advance into them. I guess Ill try calling LME again tomorrow
EDIT- Bryan at LME just told me that there is no advance ground into the cam, so thats what I was looking for
I did, however, just talk to Cam Motion and they said they usually grind 4 degrees of advance into them. I guess Ill try calling LME again tomorrow
EDIT- Bryan at LME just told me that there is no advance ground into the cam, so thats what I was looking for
Last edited by Corvette-Chris; Feb 10, 2009 at 06:12 PM.
Thread Starter
Le Mans Master
Joined: Jul 2005
Posts: 7,121
Likes: 3
From: Shreveport/Bossier Louisiana
St. Jude Donor '08
I got it for sale too 