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Old 09-12-2006, 12:10 AM
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Default Valve Springs

Hey
i got another dumb *** question (sorry i'm new to all this, just trying to learn)

What's the difference between single and dual valve springs?

When do you need what?
Old 09-12-2006, 12:24 AM
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Simple answer

Single valve springs are lighter, but cannot take as much lift of the cam.

Dual are heavier, but can usally take a larger lift of the cam. (most LS1 DVS are .650" maximum Lift)

What you need depends on what cam you have/use.
Old 09-12-2006, 09:35 AM
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Here are a few more dumb questions?

I hear that one should not rev the engine until the springs are nice and warm on a modified car. However, at the track people push their cammed cars to the line trying to keep the motor cool. Is this a myth and do you have to break in springs for 500 miles?
Old 09-12-2006, 09:39 AM
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Originally Posted by Chin180sx
but cannot take as much lift of the cam.
Thats not completely true, its totaly dependant on the spring in question. FWIW there a lot of people using comp 918's with cams in the .610 lift range.
Old 09-12-2006, 09:44 AM
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Originally Posted by RealLiveMD
Here are a few more dumb questions?

I hear that one should not rev the engine until the springs are nice and warm on a modified car. However, at the track people push their cammed cars to the line trying to keep the motor cool. Is this a myth and do you have to break in springs for 500 miles?
people who push their cars up to the line have all out drag cars. They mostlikley use a dry sump set up and pre heat the motor oil. Also they dont have much of a cooling system and sometimes dont run an alternator either.
Old 09-12-2006, 10:00 AM
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And they'll never see more than 50 miles between rebuilds which includes replacing springs. Wanna build a 50 mile motor?
Old 09-12-2006, 12:08 PM
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So it is true that I should make sure the car's temp is in normal operating range before revying.
Is the break in period of 500 miles also true.
Old 09-12-2006, 07:48 PM
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ttttt
Old 09-12-2006, 07:56 PM
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Break in for what? Springs? I've heard 10 heat cycles or 20 or however many people make up. But not a set number of miles.
Old 09-12-2006, 11:16 PM
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single valvespring - one spring holding up the valve

dual valvespring - two springs holding up the valve, one inside the other




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