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Writer/Teacher
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More TDC Questions
Well, Sundays are my day to work on the Porsche... I was planning on AT LEAST getting the belts off, the cam tower off, and MAYBE even the exhast manifolds...
Well, I wanted to MAKE SURE that my engine was at TDC. The camshaft gear notch lined up, and I looked into the flywheel inspection hole and saw what appeared to be the TDC marker (a black line running across). Just to make sure, I cranked the engine another 180 degrees... and saw, in the flywheel inspection port, what looked like a TDC marker on the flywheel. Now, doesn't the camshaft turn twice for every rotation of the flywheel? Shouldn't I be seeing a TDC mark on the flywheel every OTHER time that the camshaft gear notch matches up with the mark? MORE CONFUSED THAN EVER!
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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03-30-2008, 09:05 AM
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Registered
Join Date: Jan 2008
Location: UK
Posts: 27
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The Crank turns twice as fast as the cam, have a look at the pully sizes.
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03-30-2008, 10:40 AM
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So as long as I can see a mark on the flywheel, and the cam gear is lined up, i'm ok?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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03-30-2008, 11:04 AM
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Join Date: Jan 2008
Location: UK
Posts: 27
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Yep, I wouldnt get too hung up about it if your pulling the top end anyway things will be much clearer.
As long as you turn it over by hand with a wrench on the crank nut before trying to start it when its back together you cant do too much harm |
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03-30-2008, 11:19 AM
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Thanks for the info. Something tells me I'll be obsessively checking the flywheel throughout this entire process...
__________________
Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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03-30-2008, 01:13 PM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
