Are these the right valve springs for my cam?

Posted By: gtsdon

Are these the right valve springs for my cam? - 10/31/13 01:00 AM

Comp 932-16 springs, 513 lb. open pressure- 200 lb. installed pressure.

Camshaft is solid roller 621-624 lift- duration @.50 is 254-258.

Also using 1732-16 retainers, 4700-16 spring seat cups and 10 degree crower locks.

Posted By: Cab_Burge

Re: Are these the right valve springs for my cam? - 10/31/13 05:01 AM

Quote:

Comp 932-16 springs, 513 lb. open pressure- 200 lb. installed pressure.

Camshaft is solid roller 621-624 lift- duration @.50 is 254-258.

Also using 1732-16 retainers, 4700-16 spring seat cups and 10 degree crower locks.

I wouldn't run those pressures on a solid roller cam today, step the pressues up to 250 Lbs + on the seat and shoot for .060 to .080 before coil bind at max lift, if that gives you 600 + lbs of open pressure then I might consider using them

We really need to know more about the lobes though

I've learned the hard way that using a tiny bit to little valve spring pressure on the seats will wreak havoc with the valve train, especially the solid roller lifters

Posted By: 572charger

Re: Are these the right valve springs for my cam? - 10/31/13 11:15 AM

i use 943 springs for my street strip car 720 lift 280+ DUR i install them at 240 on the seat they are 600 open no broken parts

Posted By: gtsdon

Re: Are these the right valve springs for my cam? - 10/31/13 01:15 PM

CAB, here are all the Cam Specs-

Duration @.50 254-258
Lobe Lift .4140-.4160
Separation 108 OP-CL/OP-CL
Timing Events .050 23 51 61 17
Duration @ .20 285 290
Lift 621 624
Lash .14 .16
Degree @ 104.

As you know, I am having trouble getting this combo to perform to its full potential and have started looking for reason as to why. I will be talking to the cam manufacturer today to get their opinion. Thanks.

Posted By: BradH

Re: Are these the right valve springs for my cam? - 11/01/13 03:08 PM

Quote:

... I will be talking to the cam manufacturer today to get their opinion.

IMO, that's the first place you should have asked. Their grind, their spring rate guidance...

Posted By: BSB67

Re: Are these the right valve springs for my cam? - 11/01/13 11:10 PM

Which lobes?

Posted By: BSB67

Re: Are these the right valve springs for my cam? - 11/01/13 11:25 PM

Could not find the lobes in the minute that I looked. If the 285/290 that you have stated is actually at 0.020" (verses the .20" you state) then that is a pretty aggressive lobe and would think you would need something like the 943. (250/650 ish) spring