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Pics: Porsche 911 SC 3.0 engine teardown

Pics: Porsche 911 SC 3.0 engine teardown

Yesterday I attended an interesting Porsche Club of America event where a master engine builder took apart a Porsche 911 SC 3.0 engine. I wasn't there for the entire duration of the event but I learned a lot about the 911 SC motor and engines in general.

Here are some interesting things I learned about the aircooled 911 motor (i'm sure a lot of you already know this):

Each cylinder block and head is seperate and can be tuned individually. Optimal tuning involves matching each cylinder head to the others as closely as possible.

The firing order of the cylinders 1-6-2-4-3-5 is unusual in how it goes back and forth from each bank but it's ordered this way to prevent catastrophic flexing of the crankshaft. As a result, even with fully lightened internals and a knife-edged crankshaft the 911 SC motor cannot be revved to 8000rpm.

The alternator is attached behind the fan.

The intake valve covers have no gasket because the engine oil is sitting at the bottom of the engine, on the exhaust side. So only the exhaust valve covers have a gasket.

The air flow ducting is precisely tuned to flow to the cylinder heads, the individual block are covered with ducts to reduce air flow to them because they are not the hottest part of the engine.

It's pretty easy to mix up the alternator wires and if installed incorrectly the expensive wire loom will go up in smoke!

Some interesting things I learned about Formula 1 motors:

McLaren is currently using negative weight engine oil, most F1 teams have been using 0 weight oil for years.

F1 engines have no seals because they increase friction and thus engine oil that is up to full operating temp is pumped into the engine prior to the engine start.

The F1 engines cannot be turned over by hand because of extremely high tolerances.

Here are some pics of the motor:
Gari.pk User 11344 asked on 22 Nov 2010 10:10:29 am
1 Answer
291 views |
Anas - on 22 Nov 2010 10:10:41 am
yep reminds me of my old superiors in Stuttgart, crazy people, anyways - thats just like a regular porsche/VW aircooled engine, each cylinder has a separate barrel cylinder and head, the VW high perf heads are like porsche's one for each barrel.

Very very oldschool basic engine split 180 degrees apart
 

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