spring pressure for boost
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 94
Likes: 0
From: San Antonio Texas
spring pressure for boost How much spring pressure will I need with 20 psi and a .650 lift solid roller at 7200 rpm? I know that boosted engines like more spring pressure but how much more than N/A? I would assume that some of you guys have a similar setup...
Thanks
Thanks
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 94
Likes: 0
From: San Antonio Texas
I haven't run it yet...I'm still planning the build. The cam that comp and I specced is a solid roller with 242, 248@.050 and around .632 .650 lift that will see around 7200 rpm assuming the heads peak flow at around .650.
Last edited by DragLS1; Mar 4, 2005 at 10:30 AM. Reason: wrong description
20 pounds per square inch boost and ... a 2" intake valve is 3.14 square inches
20*3.14 = 60 more pounds of force on the valve from the boost
add that on top of however many pounds you allready need to run that cam to the rpm you want...someting like that
20*3.14 = 60 more pounds of force on the valve from the boost
add that on top of however many pounds you allready need to run that cam to the rpm you want...someting like that
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Originally Posted by Pro Stock John
I'm not SR, but we've spun my car up to 7100 a number of times on the dyno. You have to know what diameter spring you can fit and then go from there.
That thing's gonna thump pretty god too isn't it?? I have a supercharger.
You have to start with the cam and then look at what spring options you have. In my case I went to .100 longer valves early in the build to give me more spring options. My recent target was ~450/155 spring pressure.
You have to start with the cam and then look at what spring options you have. In my case I went to .100 longer valves early in the build to give me more spring options. My recent target was ~450/155 spring pressure.
