Advanging ahead...

[DOUGIEB59]

Ok gang... New question...
I'v got a 350 w flat tops, gm cast 2.02 "turbo" heads, cross ram w 2 4's, in the rat rod...
How much low end drivability do i gain back by advancing the cam 3degrees?? ( am trying to ofset the cross ram)
thnx d/b

 

[chevellelovermichael]

if i'm not mistaken, you advance for top end, and retard for bottom end.

 

[TiredIronGRB]

None...

 

[Got Rust?]

unless I am missing something, none that I can see, may even loose.

 

[donsrods]

Everytime I buy a new timing chain setup I am tempted to install the cam either advanced or retarded, just to see what happens. But I end up always putting it straight up because I am not adventurous or willing to pull it back apart if I don't like what happens. But I have a 355 Chevy ex drag engine that I may play around with the timing on when I freshen it up and put it into some racer, just to see what I get.

Don

 

[bgbrktracer]

if i'm not mistaken, you advance for top end, and retard for bottom end.

If you advance cam you increase bottom end at the cost of decreasing top end. You also lose some piston to intake valve clearance when cam is advanced.

 

[jfg455]

might want to degree the cam as well. I heve seen off the shelf cams at "0" be as much as 4 degrees either way.

 

[sgtpontiac]

Advancing or retarding the cam works.....depending

advance for low end, retard for top end.... degreeing the cam is the smart thing as some older cams are 4 degrees or better off center..newer machined cams not so much..... big cube motors seem to react better to cam advance and retard... HO racing in CA used to have 2,4,and 6 degree offset keys for that reason....(pontiac's) now there is adjustable cam gears... personally, I would degree the cam and get it straight up.... unless you're running some really high (low numerical)gears like a 2.73 or lower, advancing the cam won't gain you much.... better to have the rear gears match the cam and keep it in the power range of the cam.... JMHO.....

 

[Torch]

Sgt Pontiac just put 3 rounds in the same hole!
Nah I'd say it was a full clip....he qualifies.

 

[jfg455]

Sgt Pontiac just put 3 rounds in the same hole!

yup! he is usually sub MOA !