Valve springs, single or double?
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Joined: Mar 2015
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Valve springs, single or double? I see the Comp 26918 being referenced everywhere for these engines and mostly good reports following the redesign.
With a view to keeping the valve train weight to a minimum it makes sense to fit the single beehive style springs... Trouble is, am I pushing the limit with my cam with .621/.612 lift - getting very close to the .625 maximum.
Installed height is stock 1.800", coil bind is quoted at 1.100".
So should I run 26918 or look for something else?
With a view to keeping the valve train weight to a minimum it makes sense to fit the single beehive style springs... Trouble is, am I pushing the limit with my cam with .621/.612 lift - getting very close to the .625 maximum.
Installed height is stock 1.800", coil bind is quoted at 1.100".
So should I run 26918 or look for something else?
No you do not want a 918 for that application. PSI makes a beefier Beehive if that is the route you wish to go. Comp also makes a Conical spring that looks interesting but I have not heard much about it lately. That being said, A good dual spring kit is what most will recommend...BTR, PAC, Lunati all make a decent set of dual .660 lift springs. Actually they all probably come from the same source.
I think you could go beehive or dual, whichever you're most comfortable with, we have both in stock.
Here's the PSI beehive: http://www.briantooleyracing.com/625...e-springs.html
Here's our dual springs with titanium retainers: http://www.briantooleyracing.com/660...ers-sk001.html
Here's the PSI beehive: http://www.briantooleyracing.com/625...e-springs.html
Here's our dual springs with titanium retainers: http://www.briantooleyracing.com/660...ers-sk001.html
Thread Starter
On The Tree
Joined: Mar 2015
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Thanks for the feedback. BTR looks the way to go... The beehive's are more or less exactly the same spec as the 918's on paper at least.
I'd prefer beehive just to keep the valve train weight lower - is this sensible or would the higher spring rate of dual springs be more beneficial?
Full cam specs are:
Dur @ .050 236/242
Lift w/1.7 .621/.612
Lobe sep. 112
Planning on turning the motor to around 7k assuming that power isn't dropping off by then.
I'd prefer beehive just to keep the valve train weight lower - is this sensible or would the higher spring rate of dual springs be more beneficial?
Full cam specs are:
Dur @ .050 236/242
Lift w/1.7 .621/.612
Lobe sep. 112
Planning on turning the motor to around 7k assuming that power isn't dropping off by then.
Thanks for the feedback. BTR looks the way to go... The beehive's are more or less exactly the same spec as the 918's on paper at least.
I'd prefer beehive just to keep the valve train weight lower - is this sensible or would the higher spring rate of dual springs be more beneficial?
Full cam specs are:
Dur @ .050 236/242
Lift w/1.7 .621/.612
Lobe sep. 112
Planning on turning the motor to around 7k assuming that power isn't dropping off by then.
I'd prefer beehive just to keep the valve train weight lower - is this sensible or would the higher spring rate of dual springs be more beneficial?
Full cam specs are:
Dur @ .050 236/242
Lift w/1.7 .621/.612
Lobe sep. 112
Planning on turning the motor to around 7k assuming that power isn't dropping off by then.
What's your valve weight? Running stock rockers I assume?
Thread Starter
On The Tree
Joined: Mar 2015
Posts: 172
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Sorry, I don't have anything else other than the specs above, it'll be a Cam Motion custom grind.
Stock rockers with trunion upgrade. Valves are stock 2.0 and 1.55. Believe they are around 100 and 86 grams respectively.
Stock rockers with trunion upgrade. Valves are stock 2.0 and 1.55. Believe they are around 100 and 86 grams respectively.
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If you let Cam Motion use the seat durations they like to grind with, your 236/242 @ .050 will be 291/297 @.006 , a difference of 55 so the PSI springs will work. Asking for a lower lift like .612/.603 would work better.
Mr. Tooley, those beehive retainers on your site have a SUPER price. I want a set of those for my PSI springs, like tomorrow.
Mr. Tooley, those beehive retainers on your site have a SUPER price. I want a set of those for my PSI springs, like tomorrow.
Thread Starter
On The Tree
Joined: Mar 2015
Posts: 172
Likes: 1
Thanks for your help everyone.
I'll get some springs ordered in the next few days. Just to be clear these springs are the ones I need? Do they work with the stock retainers?
http://www.briantooleyracing.com/625...e-springs.html
I'll get some springs ordered in the next few days. Just to be clear these springs are the ones I need? Do they work with the stock retainers?
http://www.briantooleyracing.com/625...e-springs.html
Thanks for your help everyone.
I'll get some springs ordered in the next few days. Just to be clear these springs are the ones I need? Do they work with the stock retainers?
http://www.briantooleyracing.com/625...e-springs.html
I'll get some springs ordered in the next few days. Just to be clear these springs are the ones I need? Do they work with the stock retainers?
http://www.briantooleyracing.com/625...e-springs.html
The ML1515 are designed for a 1.950" installed height like the LS7 heads and some Hemi heads. They will not work on standard 15 degree LS heads.
PRODUCT DESCRIPTION
PSI 1515ML .650" Lift Beehive Springs. Designed for LS7 and other 1.950" installed height applications.
140 lbs @ 1.950", 405 lbs @ 1.300", Coil Bind 1.225", 1.290" OD, .630" ID
I loved my psi 1511's ion my old setup even with 25000 miles on them in the end they pulled to 6800 rpm cleanly and never had a hiccup. You still run the risk with duals.... That inner spring may save you if you're just idling but it wont do anything if it lets go at 6000 rpm.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.
I loved my psi 1511's ion my old setup even with 25000 miles on them in the end they pulled to 6800 rpm cleanly and never had a hiccup. You still run the risk with duals.... That inner spring may save you if you're just idling but it wont do anything if it lets go at 6000 rpm.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.
The PSI 1511 have never had a documented failure. Are they made out of Kobe steel ?
I loved my psi 1511's ion my old setup even with 25000 miles on them in the end they pulled to 6800 rpm cleanly and never had a hiccup. You still run the risk with duals.... That inner spring may save you if you're just idling but it wont do anything if it lets go at 6000 rpm.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.
With that said either is a good choice but I wouldnt get 918 a number of years back they had a lot of failures. They are corrected now but I still have seen a couple break and idk just something about that whole incident where people lost motors leaves a bad taste in my mouth.