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Registered
Join Date: Mar 2020
Location: Vancouver Can
Posts: 347
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How's my cam timing numbers?
Hello, I just finished timing my 1980 911 sc 3.0.
Stock cams, ideally is 155mm or in the range of 1.4-1.7. Prior to installing the hydraulic chain tensioner I set the timing to 155mm on both cams tdc. After installing my hydraulic tensioner.. must a moved a little. It's final numbers are L cam 1.59mm R cam 1.63mm. Are these good numbers? Am I in the specs? Thanks. |
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,492
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It’s all good...
Bruce |
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Registered
Join Date: Jul 2013
Location: Brisbane, Australia.
Posts: 2,607
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I would think that your engine might not be able to tell the difference between left and right. I would run with it.
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Registered
Join Date: Mar 2020
Location: Vancouver Can
Posts: 347
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Thanks gents.
Cheers. |
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Try not, Do or Do not
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Quote:
Most dynos wouldn't see the difference in those settings.
__________________
Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
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Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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0.03mm = 0.001"
Using SAE/Imperial gauges which measure in inches, I'd have thought I'd died and gone to heaven if I got the two sides within one thousandth of an inch. Porsche seems to believe that if you get both sides within the 0.4mm window, you are OK. Everyone thinks having both equal has to be the best, whichever end of the window you have chosen for your engine. But at some point you are just chasing your tail. In your case, if you round the numbers up a decimal point you are spot on. |
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Registered
Join Date: Mar 2020
Location: Vancouver Can
Posts: 347
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Thanks for all the input..it's my first Porsche
and my first engine tear down semi rebuild ( I didn't split the case). Learning a lot and just Checking with the Pelican gurus more so often. Cheers. |
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Registered
Join Date: Jun 2010
Location: Arizona
Posts: 2,031
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Henry,
There used to be a Porsche shop in Rainbow and I think they closed about a decade ago. I was replacing the right cam housing on my 76 and I wasn't sure about the numbers in the Haynes book. I called the shop and the guy was nice and gave me a number of .021 to .029 of lift. This was at least 15 years ago so I'm not 100% sure of the number but it was around .025 +/- a couple thou. I don't even remember which valve it was on, but it probably should be on the intake if its TDC of the exhaust stroke. The pin that locates the cam chain tensioner had wallowed out its hole and was ready to fail and was making a death rattle. Fortunately I caught it in time before it let go. I bought a used housing from a dismantler in Burbank. They sent me a housing from a later model with oil fed tensioners so I filled the hole of the cover with some epoxy putty that comes in a roll. The car ran fine after that. Did you know the guy at that shop and is his number correct for a 76 911S with a 2.7? thanks |
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