valve spring pressures, can we talk about this? |
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valve spring pressures, can we talk about this? |
brer |
Feb 21 2007, 11:51 AM
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#1
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Advanced Member Group: Members Posts: 2,555 Joined: 10-March 05 From: san diego Member No.: 3,736 Region Association: None |
I'm interested in spring pressure preferences and the ideas surrounding them.
installed height seat pressure open pressures dual single beehives maybe the best place to start would be stock. would someone like to throw that in, and maybe an opinion as to why it is good/bad? |
Bleyseng |
Mar 1 2007, 10:02 AM
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#2
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Well, it just that the thinking has changed recently. We used to install HD dual springs in order to be able to rev high. That caused problems elsewhere in the cam,lifters as high pressure results in high friction too. Plus the high pressure slams the valves shut which beats the seats into the head.
Now, the thinking is lighter valve train parts with less spring pressures to rev higher equals a engine that revs without so much abuse on the cam/lifters/heads. This is one reason Jake is going with a roller lifter/cam combo so he can reduce the stress/friction of the valve train to rev higher. |
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