Degree New Comp Cams Cam

[rklein383]

I have installed my new Comp Cams High Energy camshaft. The instructions state that Comp Cams grinds most of these cams 4 degrees advanced.

I check my cam centerline. It is 102 degrees. The cam card says the cam centerline is 106 degrees. Since this is 4 degrees advanced, is this right? Or should it be right at 106?

I have run out of time tonight. Tomorrow I plan on verifying that I have TDC exactly right and basically repeat the whole procedure.

Rod

 

[IQ52]

If you don't want to revel exactly which cam it is, could you give the lobe separation. It sounds like it is now 8 degrees advanced. The link in the post is for a 4.0 Jeep cam.

 

[rklein383]

It is a 268H-10
106 centerline
110 lobe separation

 

[SGBARRACUDA]

@106 it is 4 degrees advanced.

 

[NukeBass]

From what I understand, the centerline is usually referenced advanced/retarded from the LSA. A lot of the comp stuff is on a 110 LSA so 106 centerline is called 4 degrees advanced.

 

[madscientist]

I have installed my new Comp Cams High Energy camshaft. The instructions state that Comp Cams grinds most of these cams 4 degrees advanced.

I check my cam centerline. It is 102 degrees. The cam card says the cam centerline is 106 degrees. Since this is 4 degrees advanced, is this right? Or should it be right at 106?

I have run out of time tonight. Tomorrow I plan on verifying that I have TDC exactly right and basically repeat the whole procedure.

Rod

You need to back it up 4* to put it where comp wants it.

FWIW, when these cam guys talk about 4* advance ground into the cam, all that means is instead of needing offset keys or bushings, when you install the cam "dot to dot" it SHOULD be 4* ahead of LSA. In reality, tolerance stack up usually means it won't come out correct. So "4* advance" ground into a cam is just not a performance thing. It just hopefully makes it somewhat easier to degree in.

 

[IQ52]

@106 it is 4 degrees advanced.

From what I understand, the centerline is usually referenced advanced/retarded from the LSA. A lot of the comp stuff is on a 110 LSA so 106 centerline is called 4 degrees advanced.

You need to back it up 4* to put it where comp wants it.

FWIW, when these cam guys talk about 4* advance ground into the cam, all that means is instead of needing offset keys or bushings, when you install the cam "dot to dot" it SHOULD be 4* ahead of LSA. In reality, tolerance stack up usually means it won't come out correct. So "4* advance" ground into a cam is just not a performance thing. It just hopefully makes it somewhat easier to degree in.

Yes, yes, yes........thank you gentlemen.

 

[rklein383]

Update: Re-did my cam degreeing and all checked out at 105.5 degrees. Maybe I bumped my pointer... don't know. Close enough for government work as the spec is 106 degrees.

Thanks for the responses.

 

[bOb shingler]

may I suggest to build a pointer out of aluminum sheet metal. about 1 1/2" wide bent at a 90 at the block with one hole to bolt it down. long enough to reach up to the degree wheel and bent at a 90 and cut to a point. now if you bump it, it will stay put unlike one made of wire. plus when needing that one or two degrees to get tdc perfect you can twist it a tad and it will stay put.

 

[rklein383]

may I suggest to build a pointer out of aluminum sheet metal. about 1 1/2" wide bent at a 90 at the block with one hole to bolt it down. long enough to reach up to the degree wheel and bent at a 90 and cut to a point. now if you bump it, it will stay put unlike one made of wire. plus when needing that one or two degrees to get tdc perfect you can twist it a tad and it will stay put.

Next time. Good tip.