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Registered
Join Date: Jan 2013
Posts: 148
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964 valve spring check?
What is the values for checking valve spring on the 964?
I can only find it for up to -89 (compressed lengt vs force) |
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03-26-2018, 03:30 AM
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Registered
Join Date: Jul 2005
Location: Atlanta
Posts: 1,241
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I believe the 964 spring prescribed to the same forces as the earlier springs. When the heads are off I recommend replacing them anyway. Dougherty cams or Cgarr have a great set available now that won't break the bank (compared to Aasco $$$$).
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No physical quantity completely explains its own existence |
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03-26-2018, 06:27 AM
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The springs are normally OK, but the retainers are known to crack (if you spend time above 6500) with catastrophic results. So those should be replaced.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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03-27-2018, 01:17 AM
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1977 Porsche 911 Targa 2.7s
