Engine Cooling
10-11-2004, 01:37 AM
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Cruisin'
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Engine Cooling
I remember reading one of the threads posted here (or was it the pelicanparts forum) on engine cooling. Some kind soul had managed to do some modication to the tin work in the engine which he claims improves cooling and has shared it with all of us. Apparently, it's not exactly accessible and can only be done when the engine is dropped. I remember there was a pretty good description and some diagrams. As I intend to drop my engine soon, I might want to try the suggestion. I can't seem to find the thread. Anyone out there recall where the thread is and more importantly, anyone tried out the suggestion and does it work ???
10-11-2004, 09:42 AM
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One place this is documented is in Bruce Andersons 'Porsche 911 handbook' and is applicable to engines earlier than March 1977, when Porsche put it into production for 911 and 930 engines.
10-15-2004, 07:34 PM
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BillG, sorry for the dumb question,..
-Are these modified folds in the ends of the panels which are in place inbetween the cylinders to force more air between the plates, or do they serve another function? From the discription it's difficult to visualize.
There were two things I feel can reduce engine temperature and associated problems (leaks, warps, etc..) in the air-cooled motors:
1) Maintain the heat in the exhaust. they sell "Heat-Sheets" which is basically a shielding plate for the exhaust valvetrain cover. Another method would be to get the entire exhaust ('cept the cat) Jet-Hot coated which seals in the heat instead of radiating it while sitting in traffic after a run.
2) Improve the cylinder air flow. the engine tinware sealing is a necessity to keep hot exhaust from being sucked back in to the fan. The fan has been designed to pull only cold air from the decklid grill, but what about the exhaust? How does all that air get out? Through small slits in the heat exchanger hose bracket? Through the dash vents? This seems to have room for improvment as well.
-Are these modified folds in the ends of the panels which are in place inbetween the cylinders to force more air between the plates, or do they serve another function? From the discription it's difficult to visualize.
There were two things I feel can reduce engine temperature and associated problems (leaks, warps, etc..) in the air-cooled motors:
1) Maintain the heat in the exhaust. they sell "Heat-Sheets" which is basically a shielding plate for the exhaust valvetrain cover. Another method would be to get the entire exhaust ('cept the cat) Jet-Hot coated which seals in the heat instead of radiating it while sitting in traffic after a run.
2) Improve the cylinder air flow. the engine tinware sealing is a necessity to keep hot exhaust from being sucked back in to the fan. The fan has been designed to pull only cold air from the decklid grill, but what about the exhaust? How does all that air get out? Through small slits in the heat exchanger hose bracket? Through the dash vents? This seems to have room for improvment as well.