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Valve spring installed height

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YOUR RESEARCHValve spring installed height

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Install height is 1

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I know this won't help for the 3.6 , but for the 3.4 installed height is 1.340, seat psi 50lbs, open psi@.940 125psi, coil bind .875.
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Valve spring installed height

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Leading evidence: 'Install height is 1' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install height is 1' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Install height is 1

No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
I know this won't help for the 3.6 , but for the 3.4 installed height is 1.340, seat psi 50lbs, open psi@.940 125psi, coil bind .875.
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Valve spring installed height

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POST 1 / ORIGINAL POSTEROriginal post

I`m looking for valve spring install height or pressure for my m96/03 heads. I do now that there is no official spec from Porsche. The vale seats are recut and valve`s regrind. But i did`t measure before head work. If there is some one that have a head off and it haven't ben recut and can take that measurement.I would really appreciate that to. I`m rebuilding the engine with niksail sleeve from Hartech in UK and w�ssner pistons. Mats T

POST 2Original post

If you have a slight height difference from valve seat re grind, the hydraulic lifters should adjust to this I would imagine, I would recommend using new lifters and new hydraulic chain tensioners in your build , maybe others will chime in to confirm

POST 3 / ORIGINAL POSTEROriginal post

It`s spring pressure that i`m concerned about, when measuring intake and exhaust with my current install height I got 50 lbs/ 22 kilo and at 10mm lift 130lb/ 59kilo on exhaust which i think is low. Intake 80lbs/36kilo and at 10mm lift 190lbs/86kilo.

POST 4Original post

Quotes source post: 15706727

I know this won't help for the 3.6 , but for the 3.4 installed height is 1.340, seat psi 50lbs, open psi@.940 125psi, coil bind .875. You could call Hartech and ask, they are more likely to give up specs than FSI.. I doubt you cut enough off the seat and valve to make a difference, if you did, you or your machinist should know. usually only takes a couple thou the clean them up. As far as spring pressure, you could always just buy 1 intake and 1 exhaust spring and use that as a reference to compare all the other old springs.

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