Valvesprings???
07-21-2004, 01:18 PM
#1
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Valvesprings??? Im thinking about changing cams from my asa cam to a tsp 233/233 or tsp 231/237. my current comp 918 valvesprings are only 3 months old and have about 3,000 miles on them. im wondering if they will hold up under the new cam for about a year or maybe another 6k-9k miles. i then will be purchasing new heads. i dont run the car at the track and rarely give it all its got. will the comp 918s hold up??? thanks for any help!!! i definately dont wont to break a valvespring!
07-21-2004, 01:42 PM
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I don't see why they would have a problem.... I'm not the expert by far, but to me they sound to be brand new still. I bought the 918's for a cam w/ .600" of lift, and the guys down at TR assured me repeatedly that they should be a bullet proof application for 60k+ miles.
07-22-2004, 04:19 PM
#5
Personally, with the TSP cams I'd go with the Patriot Gold dual spring setup they have for $295. I thought about going with Comp 918s with my cam, but decided that I the Comps would be seriously stressed with the 231/237 cam... you could always sell your used Comp 918s for about $100 and then you'd only be paying out a difference of $200 for the Patriots, which is well worth the piece of mind, IMO.
07-22-2004, 06:28 PM
#7
A 918 spring versus the "gold" spring...on that cam...a 918 will wayy out perform it..hands down..a 918 can be used safely on a .625" lift and a high duration..the harmonics and dynamics of the 918 will kill and dual spring
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07-22-2004, 06:43 PM
#8
Originally Posted by Unaffiliated Racing
A 918 spring versus the "gold" spring...on that cam...a 918 will wayy out perform it..hands down..a 918 can be used safely on a .625" lift and a high duration..the harmonics and dynamics of the 918 will kill and dual spring
Why chance a broken valvespring after a few thousand miles on a cam like that when there are dual springs readily available?
07-22-2004, 07:01 PM
#9
This is where everybody is wrong...since the batch issue a couple of years ago on the non-stripes..there have been NO 918 failures..there are people that have the 918's on large duration, high lift cams for tens of thousands of miles.....
07-22-2004, 07:11 PM
#10
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piece of mind going with a dual spring. patriot gold are the best springs on the market right now. and yes ive seen 918's break sinch the batch issue. just ask a few people around here like vince.
07-22-2004, 11:54 PM
#11
I hope you're not trying to say that a Comp 918 spring on a cam like a TSP 231 or the 233 would last the same amount of time and be just as strong as a good dual spring.
Go ahead and ask around with the sponsors and see what they're response would be if you ask them if Comp 918s are as good as a dual spring when coupled with a big duration, high lift cam with an aggressive lobe profile.
Go ahead and ask around with the sponsors and see what they're response would be if you ask them if Comp 918s are as good as a dual spring when coupled with a big duration, high lift cam with an aggressive lobe profile.
07-23-2004, 06:59 PM
#14
step outside the box...you look at the ramp rates..do you ever consider the weight savings of the 918 and ti retainer over a dual spring set up...it's a very large factor that you aren't looking at
07-23-2004, 09:18 PM
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Originally Posted by Unaffiliated Racing
step outside the box...you look at the ramp rates..do you ever consider the weight savings of the 918 and ti retainer over a dual spring set up...it's a very large factor that you aren't looking at
07-23-2004, 10:08 PM
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I'm with Unaffiliated...Beehive ovate springs are a great design. They damn near weight 1/2 of a dual spring. If you ever read anything about these style springs and how they are harmonically, you'd see his point. The weight savings is not primarily about increased horsepower as it is increased valvetrain stability. The 918 springs control the valvetrain with very little spring pressure due to the design. Dual springs need the increased pressure to help prevent valvefloat because of harmonics and the added weight. I've been running my 918s on my XER cam for 25k...the spring pressure is still close to what it was after breakin. I'm no valvetrain expert by any means, but there are too many uneducated people thinking they're experts. And I'd like to hear someones explanation why dual springs have a longer life than a 918 spring? These arent H-11 tool steel.
Last edited by MyLS1Hauls; 07-23-2004 at 10:25 PM.
07-24-2004, 09:58 AM
#19
finally someone gets the big picture..like he said earlier, with the less weight you can give better control with less spring pressure. If I were running say...an LS-6 valve..there is no way in hell I'd use a dual spring on a huge friggin cam. I'd use a 918 and not only that I would shim it up to .050" before coil bind. Beehive springs work their best when pushed all the way to their max.
