COMP 918 Springs Question
Direct from the Comp website:
"Designed for LS1, LS2 and LS6 engines when a performance cam is used. This spring, when combined with the appropriate titanium retainer, will outperform almost every spring package in the Gen III engine. This spring is designed for a maximum of .600" lift at the valve, so it is the most ideal spring for most street and mild race applications."
Rossi
"Designed for LS1, LS2 and LS6 engines when a performance cam is used. This spring, when combined with the appropriate titanium retainer, will outperform almost every spring package in the Gen III engine. This spring is designed for a maximum of .600" lift at the valve, so it is the most ideal spring for most street and mild race applications."
Rossi
And I copied this directly from Texas-speed.com. I know yours if from comp, but what gives? The specs of my cam are 226/234 .598”/.602” 111LSA +3 advance. It was recommended to use the Comp 918 or PAC 1518 for the cam. I am not very knowledgable at this cam stuff yet so I guess I am just trying to figure this out.
Comp Cams "918" Stock-Diameter Replacement Springs
Item#:
4-26918-16
Price/ea.
$169.99
Beehive Shape Ovate Wire Springs
The 26915 and 26918 Valve Springs are specifically designed for the LS1 Chevrolet cylinder head and
can be used as stock replacements or in performance applications all the way up to 0.625” lift and at engine speeds to 7500 RPM. Engineered to fit stock heads with no machining, utilizing the stock valve seat and spring retainer. This valve spring can also be used in all applications with the specifications list-ed.
Comp Cams "918" Stock-Diameter Replacement Springs
Item#:
4-26918-16
Price/ea.
$169.99
Beehive Shape Ovate Wire Springs
The 26915 and 26918 Valve Springs are specifically designed for the LS1 Chevrolet cylinder head and
can be used as stock replacements or in performance applications all the way up to 0.625” lift and at engine speeds to 7500 RPM. Engineered to fit stock heads with no machining, utilizing the stock valve seat and spring retainer. This valve spring can also be used in all applications with the specifications list-ed.
I'm in the same boat as you. There is only a very small difference between the 26915 and the 26918. So then which one do you choose from there. Seems like everyone has a different answer. I'm leaning to the 26918's
I was told to use the 918's but my lift is just above .600. So that is why I am trying to find out if I should indeed use the 918's since the lift is apparently .600 by what the manufacturer says. Although they have a vendor saying differently.
The 918's used to be rated at 0.625" lift and IIRC they lowered it to 0.600" due to their other springs being rated at 0.650" and wanting to boost sales of those. I ran them on a 0.603" lift cam w/ no problems for about 15K miles. I've heard the PACs are better though.
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Yup. I had them on my cam only set up for 30k of them w/o any problems.
The ratings changed as Comp changed their 918 springs. The rating was bumped up when they were using their 928 springs in place of the 918's for a while, and the 928's could accomodate more life. I do not know if they have made a change back to the original 918 design or if they just wanted a more conservative rating on them. I've sent an e-mail to our Comp rep, and I will report back with what he says.
Trevor
Texas Speed & Performance
Trevor
Texas Speed & Performance
__________________
The ratings changed as Comp changed their 918 springs. The rating was bumped up when they were using their 928 springs in place of the 918's for a while, and the 928's could accomodate more life. I do not know if they have made a change back to the original 918 design or if they just wanted a more conservative rating on them. I've sent an e-mail to our Comp rep, and I will report back with what he says.
Trevor
Texas Speed & Performance
Trevor
Texas Speed & Performance
I really like the PAC springs also, we stock both the PAC springs & Comp 918s so give us a call & we can set you up with whatever spring you decide! I'd be happy to measure pressures if that would help!!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
FastB:
Another option may be the AFR 8019 springs. They're $15.00 a piece and that will get you .650 lift. That's about the same price as a set of the 918's from Comp. ($42.56 additional to be exact). I'd post a link here, but I'm not sure how this forum feels about their vendors. CF frowns upon that...(Hope it's okay what I posted here). No experience with these springs but Mamo used them in his LS1 build...
Regards,
Rossi
Another option may be the AFR 8019 springs. They're $15.00 a piece and that will get you .650 lift. That's about the same price as a set of the 918's from Comp. ($42.56 additional to be exact). I'd post a link here, but I'm not sure how this forum feels about their vendors. CF frowns upon that...(Hope it's okay what I posted here). No experience with these springs but Mamo used them in his LS1 build...
Regards,
Rossi
