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Registered User
Join Date: Oct 2014
Location: Bay Area CA
Posts: 23
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911SC engine rebuild panic - piston-valve clearance check
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Paul 1982 911SC |
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Join Date: Apr 2016
Posts: 792
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I did the same build as you on my SC only I used JE pistons. Same cams. I don't believe there are any valve clearance issues with a 964 cam - it's too mild.
Looking at your numbers, I'd just run it. Race cars have less clearance than that.
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Current: 1970 914-6 conversion 2.7, 1973 T, 1975 930 Turbo Targa, 1978 928 Race car, 6.57L, 1983 911SC, 1987 928S4 5 speed, 2002 911 Targa, 2007 997TT, 2009 997TT, 2004 40th Anniversary Carrera Only reproduction 3.6 cases on the planet, coming soon www.taorminaracingdesigns.com |
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Registered User
Join Date: Oct 2014
Location: Bay Area CA
Posts: 23
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I like your thinking! I sourced the piston-cylinder set through EBS and have been consulting with Don, and before I did this check, he didn't have concern regarding clearances. So, I'm surprised with the results given that the 964 cam is by no means aggressive.
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Paul 1982 911SC |
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To be honest I didn't even check mine. Before someone flips out, keep in mind that I've built several dozen 911 engines and the 3.2SS upgrade is so close to the original and the 964 cam is so mild that I would be shocked if there were interference issues.
I currently own motors that have been iffy - very high lift cams and such. Those are nail biters, you are constantly running on the thinnest of margins. A 3.2SS made from a 3.0SC is not one of them. Screw the valves out, rotate it 720, call it a day.
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Current: 1970 914-6 conversion 2.7, 1973 T, 1975 930 Turbo Targa, 1978 928 Race car, 6.57L, 1983 911SC, 1987 928S4 5 speed, 2002 911 Targa, 2007 997TT, 2009 997TT, 2004 40th Anniversary Carrera Only reproduction 3.6 cases on the planet, coming soon www.taorminaracingdesigns.com |
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