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cohen20

By cohen20,
in Engines & Forced Induction

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BezerkR32 Veteran

BezerkR32

Posted
Posted

Waste of time changing the cams without replacing the valve springs. you will not get the full potential out of your cams. wont be able to rev it any harder which makes the operation pointless. Also the increase in lift might cause the old springs to fail.

i have a r32 gtst rb20 i have tomie cams 260 with 8.7lift just wondering if any one has put these in there car before and if they fit in with out needing to change the valve springs thanks
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Abo Bob Grand Master

Abo Bob

Posted
Posted
Waste of time changing the cams without replacing the valve springs. you will not get the full potential out of your cams. wont be able to rev it any harder which makes the operation pointless. Also the increase in lift might cause the old springs to fail.

This is the first post of yours I've ever questioned.

You don't have to rev it any harder to get more power out of it just because or in spite of having cams. They should increase your power or at the very least give you the same power at less boost at the same revs.

Strangely on the RB20 Tomei recommend you change springs for the type b poncams (what cohen has) but not for the type a poncams which I find bizarre because they have the same lift but different duration. I would have thought that the longer duration would give a slower ramp rate at the same lift and therefore less stress on the springs.

I say whack em in and have fun.

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Abo Bob Grand Master

Abo Bob

Posted
Posted

Yeah only worth it with bigger turbos.

Cohen, the rule of Tomei is as stated above:

Poncams...direct fit no spring change

Procams....spring change.

But... I don't see there being a massive problem with the difference between the poncam and the smallest procam that you have. Depending on costs, I would give it a go.

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