Engine Cases
 

I have been looking at different engine cases. I have noticed that there is not a great difference in price between the 3.2 and the 3.3 engine cases. Is there a benefit to using a 3.3 engine case to build a normally aspirated engine?

Yes, if the 3.3l case also happens to contain the turbo oil pump. ;)

Trying to remember if the 3.2 case had the oil squirters like the 3.3l does for piston cooling.

The case for 3.2 and 3.3 is the same.

The 3.0 case is really similar, but has the sump plate on the bottom rather than just a drain plug.

As Scott points out, the 3.2 and 3.3 cases are the same and differ from the SC case only in the replacement of the sump plate with with a drain plug. Both have piston squirters

The attached pics show the difference:

SC case

http://forums.pelicanparts.com/uploa...1289725090.jpg

http://forums.pelicanparts.com/uploa...1289725207.jpg

3.2/3.3 case

http://forums.pelicanparts.com/uploa...1289725287.jpg

http://forums.pelicanparts.com/uploa...1289725345.jpg

That is amazing. Thanks for the information. Sounds like value would depend on whether or not the case came with a turbo pump?

Are they better than the 3.6 case, or are they basically the same?

3.2 case
 

The other plus of a 3.2 or the late 3.3 is if you plan to run EFI or management, those cases have the mounting points for the crank reference sensors. The squirters can be changed to the larger ones if you need them. The 3.6 case is a completely different animal.
Mike Bruns JBRacing.com

I found 79 turbo case. Which I believe would be a 3.3. I assume this is not the same case as the late 3.3 cases. Do the later 3.3's have the larger squirters?

The 79 3.3 case will be the same as the SC. Generally the oil pump is priced separately.
Bruce

OK, I see. There would be no advantage unless it had the turbo oil pump. Sounds like I will need to get a 3.2, or wait to see if a 3.3 with turbo oil pump comes up.

Unless the turbo oil pump bolts onto the 3.2?

This is such a good site!

You can use the turbo pump with the SC case. You'll need to use a "dished" sump plate to clear the screen on the turbo pump suction inlet.

Just a small tidbit to add: Beginning around mid-1983 model year production, SCs have the later Carrera engine case with the drain plug instead of the sump plate.

Brian

Which cases has the large spiston squirters?

case
 

I just checked a 930/04 case 78/79 3.0 SC its squirter is .039 in, I have an 89 3.6 and it pins out at .084 in, I will look to see if I have a 3.2 case
Mike Bruns

I am wondering which case is stronger with regard to high-rpm 3,2SS build - should I base it on an a 3.0 SC or a 3,2L case?

cases
 

I have used both styles over the years on some very powerful 3.0 and larger race setups and have had good results, If I had a choice I would use the later style but that does not mean I would avoid the earlier, I like the way the scavenge pickup looks in the later case and it has to be stronger by design with full perimeter contact.

Mike Bruns JBRacing.com

3.0 1978-1983
No crank reference sensor mounts
Accepts Turbo oil pump
Standard piston squirters
Sump plate like early cars

3.0 1983.5
No crank reference sensor mounts
Accepts Turbo oil pump
Standard piston squirters
No sump plate, looks like later cars (1984-1998)

3.2 1984-1989
Crank reference sensor mounts
Accepts Turbo oil pump
Standard piston squirters
No sump plate, looks like later cars (1984-1998)

3.3 early
No crank reference sensor mounts
Accepts Turbo oil pump
Turbo (large) piston squirters
Sump plate like early cars

3.3 late
Crank reference sensor mounts
Accepts Turbo oil pump
Turbo piston squirters
No sump plate, looks like later cars (1984-1998)

Does this help you?

They are all basically the same. You can weld on the mounts for reference sensors, the sump plate is not that big of a deal, you can retrofit larger squirters in a standard case.

BTW, I have a 3.2 case, PM for details.

That is excellent help. On a side note, I have been shopping around for cases. I have found that there are large variances in pricing. There are deals out there, I even found a reputable dealer who said that he has a GT3 case for $1500. He does not have any Turbo or 3.2's, but I am hoping to go see what he has. He gave me an interesting run-down on pricing. It seams like the key is to be patient.


Thanks everyone.

Scott, that is a very good reference. Could you put case casting numbers to those versions? I'm guessing 930.101.103.4R & 930.101.104.4R for the first version.

The information must be in a chart ....somewhere on-line.

This is my own chart, started just recently because I could not find such info anywhere else:
911 engine case Revisions

Agreed the sump plate is not a big deal, given the availability of aftermarket sump plates like Mainley and AutoSport to name a few.

With respect to the cases for a basis of your engine, don't you also need to consider cranks? The 3.0L 70.4 mm crank is very plentiful and relatively cheap. The later 3.2L 74.4 crank is typically a bit harder to come by and thus more expensive.