Thread: Cam and spring shootout!!

ok where do i start....


Xp cam

90# springs

105#springs



specs...

212°/224° at .050"
Intake Lift .325" (.520" lift at 1.6:1 rocker ratio)
Exhaust Lift .335" (.536" lift at 1.6:1 rocker ratio)
116 Lobe Separation




I need a cam ...you tell me what combo is better using the above parts and why..and i will be replacing the tensioner and i don't care about it wearing out ''quicker''

Why not go with a double roller?

i have a rockered car and kept my double roller after i got rid of my cammed setup just for the pure fact that ill never have to open the front cover again.

with the xp id do 105# springs, but you can use 90# if you want.

It is one chain but is built like two chains side by side. So instead of one set of teeth on a gear there are two. Does that make sense. ZZP does not have a good pic on their site. But there is a catch to running a double roller. To do it safely it is has been discovered that you need to machine the crank gear. Here I will find the thread on this forum that discusses it all.

http://www.grandprixforums.net/f18/t...ains-2351.html

Reptile could probably explain it better.

you delete the tensioner with a double roller. i milled down my oil pump cover 20 thousandths and ive been fine since. a stock timing chain and dampener are fine, but they just wear out a little quicker with a cammed setup.

Originally Posted by Bio248

you delete the tensioner with a double roller. i milled down my oil pump cover 20 thousandths and ive been fine since. a stock timing chain and dampener are fine, but they just wear out a little quicker with a cammed setup.

I would also get the bevel machined on the crank gear.

I'm now VERY comfortable with my machined crank gear on my double roller. Before, I only had a machined oil pump cover, and it was damn close to rubbing with it being machined.

The bevel added to the crank gear made me worry free now about running it.

I find it funny that Zooomer/ZZP said on CGP that running a machine oil pump cover would cause more problems than running two front cover gaskets...they recommended only running two front cover gaskets...now they sell machined oil pump covers...how long before they start selling correctly machined double roller timing chain sets with the modified crank gear? But wait...there is no problem with the double rollers. Only a select few have this issue.

~F~

Originally Posted by GR8racingfool

I find it funny that Zooomer/ZZP said on CGP that running a machine oil pump cover would cause more problems than running two front cover gaskets...they recommended only running two front cover gaskets...now they sell machined oil pump covers...how long before they start selling correctly machined double roller timing chain sets with the modified crank gear? But wait...there is no problem with the double rollers. Only a select few have this issue.

~F~

I saw that also and just thought whatever I guess. That is the result of letting your customers be the ginnie pigs.

my question is: How much quicker do the 90# springs wear out the tensioner than the 105#, and how much quicker does a cammed setup on 105's wear one out than stock? I'm at 120k and still on my stock timing chain and dampener with stock cam.