918 Valve Spring Question
918 Valve Spring Question I have been doing some looking and the 918s are rated at different specs at a few different places. JRP rates them to 625 lift and sponsors rate them to 600 lift. What size cams are you guys running with 918s and not having any problems. Im considering to upgrading cams to a 600 609 and was wondering if I needed to go ahead and change the springs. Any info is appreciated.
Brian
Brian
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
If you are running 918's and wish to swap cams to those lifts, you'll have to change springs to new ones anyways. You can run 918s again or go to duals like PP/PRC golds.
The 918's WILL handle those lifts if properly setup.
The 918's WILL handle those lifts if properly setup.
Originally Posted by BrianC98Z28
how would they need to be properly setup to handle the new lifts?
Originally Posted by 2000TransAmWS6
how do you know when you need to shim a spring?
i'll be running my 918 springs with a cam that lifts .575/.563
i'll be running my 918 springs with a cam that lifts .575/.563
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by 2000TransAmWS6
how do you know when you need to shim a spring?
i'll be running my 918 springs with a cam that lifts .575/.563
i'll be running my 918 springs with a cam that lifts .575/.563
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Verdad Gallardo Alos its is often recommented not to shim beyond 0.040" if you have to shim more then that to get the proper installed height then that spring is inadequte or there is something wrong with the set up. Now I have heard of locks that are offset to also help getting the recommended height without shimming, I have no exp there but thats just what I heard.
As for Brian's second question, with the 918, it seems to have enough room where the spring wont coil bind. The lift is not near the max recommended lift. I am sure there is some variation in the installed height from spring to spring but its probably not enough to have a negative impact.
As for Brian's second question, with the 918, it seems to have enough room where the spring wont coil bind. The lift is not near the max recommended lift. I am sure there is some variation in the installed height from spring to spring but its probably not enough to have a negative impact.
