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Registered User
Join Date: Jan 2012
Location: Illinois
Posts: 11
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82 911 valve clearance
Just timed left side cam to 1.52mm. Checked intake clearance and have 1.1 mm checked exhaust clearance and have 2.5 mm is the intake ok or should I try to retard the cam for more clearance. Have read that 1mm is ok. Just wanted another opinion before I time right side cam. Thanks in advance for any advice. This is a stock rebuild 930/16 CIS motor with the only change being .005 taken off of the heads to clean up after broken head studs.
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06-26-2012, 05:52 PM
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Registered
Join Date: May 2003
Posts: 3,346
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1.1 is enough on the intake side. How did you measure it? If you were at TDC you might not have an accurate measurement.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-27-2012, 04:12 PM
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Registered User
Join Date: Jan 2012
Location: Illinois
Posts: 11
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I started at TDC and rotated ATDC by 5deg each time until i cleared piston.
This was measured using a dial indicator with no rocker clearance. I know that it is close but i thought that the CIS motors had more clearance than that from the factory? The only minimum clearance that i could find was in Waynes book being 1.5mm but have herd that 1mm is ok. |
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06-27-2012, 06:27 PM
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