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Registered
Join Date: Jul 2000
Location: Northampton, PA, USA
Posts: 334
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Cam Timing 3.2 Can someone check my math please?
Good Morning. I am working on cam timing for my 3.2, and discovered that my dial indicator only reads .001" resolution. Specs are in mm. My math is as follows:
1.25mm*.03937= .0492125" Does this seem correct? Overlap setting at .049" Thanks!!!
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Mackskibum aka Dave Austin '66 911 Work In Progress (#303734) '85 911 Carrera 06 325XI '05 Envoy XL SLT |
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06-02-2007, 05:16 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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That is the correct conversion.
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06-02-2007, 05:28 AM
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Join Date: Jul 2000
Location: Northampton, PA, USA
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Thanks Souk!!
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Mackskibum aka Dave Austin '66 911 Work In Progress (#303734) '85 911 Carrera 06 325XI '05 Envoy XL SLT |
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06-02-2007, 05:31 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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No problem. Good luck with the rest of the work.
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06-02-2007, 05:34 AM
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Join Date: Dec 1999
Location: Novato, CA
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Your math is correct but your specs are wrong. Overlap at TDC is set with 0.1 mm valve clearance, not with 1.25 mm.
Cheers, Joe |
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06-02-2007, 03:25 PM
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Location: Northampton, PA, USA
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I hope I'm not wrong stlrj. I got the specs from Wayne's book as follows:
1984-1989 Carrera 1.1-1.4 (1.25) The way I read is that 1.1-1.4 overlap is factory spec, 1.25 is ideal. My math tells me this: .043-.055 is spec .049 is ideal. Your numbers look correct for an SC.
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Mackskibum aka Dave Austin '66 911 Work In Progress (#303734) '85 911 Carrera 06 325XI '05 Envoy XL SLT |
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06-03-2007, 05:55 AM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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You are right. The spec I quoted was for the initial valve clearance.
What you are talking about is the total lift at overlap or TDC and your numbers are correct. Cheers, Joe |
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06-03-2007, 06:08 AM
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