Is it overkill to be running dual springs rated to .650 on a cam that nets only .555 lift. I understand that I won't be pushing the springs to their limit but is the extra spring pressure counter productive to any horsepower benefit? Or would the pressures equalize out, i.e. one compressing, another expanding so in turn end up being neutral forces? Or would I be better off going for a single coil, beehive spring closer to the cam lift to minamize harmful harmonics?

 

what'a the cam profile and how hard you going to spin the motor?

 

Been thinking the same thing!
My cam is a HOtcam 218/228 and .525 lift, with 1.8 Harland sharp RR's, which equals a new lift of .556 and new duration is 220/230. Sorry didn't mean to highjack!

 

any time that happens it will benifit everyone has there debates try putting stock springs with stock cam then try putting aftermarket springs with stock cam it makes the world of a diffrence goes eathier way thou

 

You're probably better off running a single beehive for a .555" lift cam. A dual valvespring capable of .650" would either:

a)cause you to run excessive coilbind clearance which reduces a springs harmonic dampening effect

b)cause you to shim the hell out of the spring in order to reach an adequate coilbind clearance, but also resulting in excessive seat pressures.

A single beehive spring, on the other hand, will probably control the valvetrain and reduce fuss points better with less spring pressure, ie friction.

 

This is almost identicle to my Z06 with 1.8 YTs. I'm running PAC 1518 beehive springs that are good to .650 and I'm routinely spinning this motor to 6,500 as it's a track car. So far everything is working out just fine.

 

I like the way you explain things.
OP Listen to this guy.

 

well there you have it!!
I guess were screwed with some patriot springs....damn its 200 for the spring install! and if I buy a cam with a 59? lift I'm ok and a cam install is 400bux man oh man, more money to blow......
all of this from recommendations by my installer!
thank you predator for chiming in KCS for the elaboration.

 

No problem, here to help.

Pred, thanks for the compliment.

 

I called Patriot today and spoke to Chad, Wow do they have some of the best customer service there. They even took the time to help me with some other issues!
But he said I should be fine with the Harland 1.8's and have no worries with any *excessive coilbind clearance which reduces a springs harmonic dampening effect
*cause you to shim the hell out of the spring in order to reach an adequate coilbind clearance, but also resulting in excessive seat pressures
Thanks Chad @ patriot performance!