Stock vs. double roller timing chain?

[sixgun86gn]

I have a fresh 4.1 that I have built and it seems kind of doggy down low,compared to my old 4.1 combo.

The differences are minor as far as cam specs last one was a 218/218,and the new one is a 214/224.

I am also using a stretched slic instead of a front mount.

I don't see these as causing a 50hp (estimated) difference.

I did use a stock timing chain on this build,last one used a double roller.

I believe the stock chain is retarded 4 degrees for emissions reasons,is this correct?

I also believe that most double roller chains are corrected,is this also true?

Could my cam being retarded 4 degrees cause my power band to be moved up enough that the low end is killed some or it's costing me some power?

 

[bison]

What is the overlap in the cam? All you listed was the duration. If your cam is retarded 4 degrees it will be a pig. I have a 218/224 at 110 and i will be advancing it 4 degrees. It will still be very weak below 4500.

 

[sixgun86gn]

Cam specs show 61* overlap and 112 lobe center angle.

Am I right about the retard in the stock chain set?

 

[bison]

Cam specs show 61* overlap and 112 lobe center angle.

Am I right about the retard in the stock chain set?

I dont believe so. If they wanted it retarded it would have been ground in to the cam.

 

[sixgun86gn]

Well I know the v8 buick cam gear is 4* retarded and some cams are ground advanced because of this.

I thought the v6 cam gear would be the same for emissions reasons.

I'm going to change the timing set out for a double roller anyway and see how it feels. Can't hurt any.

 

[bison]

Degreeing the cam will answer these questions without any doubt.

 

[getchasum]

Degreeing the cam will answer these questions without any doubt.

X2

Most cams I have degree had 4* advance built in from the manufacturer (that's using good double rollers installed straight up), but that's not a bad thing cause as (most chains) will stretch that will retard the timing several degree. Last billet Crane I installed, I ended up retarding it 2* and it stilled show 2* advance. I figured once the chain streched a bit I'd still be close.

Each degree of cam timing moves the power band range about 50 RPM's according to one of the cam web sites (Comp Cams). So I do not see a few degrees either way making much difference.

 

[charlief1]

Unless you have a custom ground cam and specifcaly tell them that you want it ground "straight up" it will have a 4 degree advance. Use a degree wheel to find out and set it right,