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Registered
Join Date: Jul 2003
Location: Port Macquarie Australia
Posts: 510
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Cam Timing Question
I am timing the cams on my 930 (glad I have Waynes Book) I set them up accurately but when I removed the vicegrips and replaced the tensioners the timing moved slightly due to the change in timing belt tension.
The range according to the manual is 0.65 - 0.85 (0.70 being ideal). With the clamp in place I had 0.70 on both left and right. With the tensioners installed I have 0.77 left and 0.71 right. Do I need to redo the timing?
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2008 BMW 320i 2006 Mercedes ML320 2004 Mercedes ML270 cdi 1998 Porsche Boxter 1988 Porsche 930 Targa (sold) Last edited by rotorhead; 03-27-2005 at 04:40 PM.. |
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03-27-2005, 04:14 PM
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Join Date: Feb 2004
Location: California
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A rough rule of thumb is .3mm is one degree of camshaft timing. I would say your engine is within 1 degree of ideal.
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John Dougherty Dougherty Racing Cams |
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03-27-2005, 05:10 PM
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Location: Port Macquarie Australia
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Thanks for the quick reply John, this bbs is awesome.
One interesting thing I noticed was the difference in timing when turning the crank clockwise to the TDC mark against turning it past the mark then turning it back CCW. There was around 0.05 difference, I figure this is the amount of play against either face of the teeth on the cam sprocket.
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2008 BMW 320i 2006 Mercedes ML320 2004 Mercedes ML270 cdi 1998 Porsche Boxter 1988 Porsche 930 Targa (sold) |
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03-27-2005, 05:16 PM
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Join Date: Feb 2004
Location: California
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Yes , the slack in the chain will give you different reading. When setting the camshaft timing in any engine the chain should be preloaded by turning the engine in the direction it will be running.
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John Dougherty Dougherty Racing Cams |
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03-27-2005, 05:30 PM
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