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Old 10-21-2004, 00:34   #1 (permalink)
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dev 5 heavy duty valve springs

What brand are the heavy duty valve springs in the dev 5 kit ?

OR

If I want to buy similar ones which ones can handle the cam ?

I want to get the individual components locally and just mail order the cam when I have the money.
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Old 10-21-2004, 00:35   #2 (permalink)
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Re: dev 5 heavy duty valve springs

Find out the cam lift .Crow cams sell valves springs for the au for high lift cams.
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Old 10-21-2004, 00:37   #3 (permalink)
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Re: dev 5 heavy duty valve springs

But aren't the specs on the cam hush hush ?
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Old 10-21-2004, 00:44   #4 (permalink)
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Re: dev 5 heavy duty valve springs

I think its all patented design.If you want to know talk to soxx.He knows how much lift its got.At least you can get the stuff here.Also I think crow do vernier gears.But its your choice..ask Jmm what price they can do for you.
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Old 10-21-2004, 02:28   #5 (permalink)
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Re: dev 5 heavy duty valve springs

I spoke to JMM about valve springs for a dev 5 cam and he says others won't last for as long as theirs due to "such a high lift" of the cam.
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Old 10-21-2004, 03:22   #6 (permalink)
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Re: dev 5 heavy duty valve springs

You will need heavy duty valve springs with JMM's Dev5 for sure. My dev3HL has enough lift to F*** std springs royally and valve float is not very nice.

I know JMM's springs aren't cheap but I have absolutely no fear holding first and second to the the cut out any time I want. When you change the springs you can compare the stock ones to the JMM ones and the stock springs are as weak as P***. The stock spring you just lean on to compress the JMM ones you have to lever them down.
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Old 10-22-2004, 07:24   #7 (permalink)
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Re: dev 5 heavy duty valve springs

Bit of a shame its all hush hush but I beleive the Single with Dampers usually have 90lb seat (1.82") and 250lb open (1.32") with 0.500" lift cam and Dual Springs usually have 110lb seat (1.82") and 300lb open (1.280") at 0.540" lift. Just ball park figures of spring pressures with cams with different lift but u need to find out duration at 0.050" to be accurate. There is a web site with a graph of lift and dur at 0.050" and it tells u roughly what spring pressures u should use.
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