SuperSport

Greetings from a new member.

What is the main difference(s) between a US spec SC motor and a Euro spec one? The Euro is good for an extra 20hp and definitely feels it from the cars I have driven.

Noel

I see this is your first post on Rennlist. Welcome aboard!

From 1978-1979 there was no difference in power between the Euro and US cars. 1980 Euro cars had 8hp DIN more than the US car. There seems to be some debate as to what caused this difference as the US cars had their compression ratios raised that year and not the Euro cars. The 1981-83 Euro cars had the compression raised and generated 205HP DIN vs. 180 HP DIN for the US.

This topic has been discussed before on this forum. If you do a search you should be able to find much more info.

SuperSport

Thanks for the info. Do you know if it would be possible to drop in some higher comp pistons while retaining the rest of the stock components on the motor?

I tried doing a search and didn't find much info. Could be my feable search skills on a new forum however.

cmoss

I just received a Peformace Products catalog, and they had 3 liter piston sets that raised the compression. Check out their website. (no affiliaton--but if they want to send some $$'s my way for directing you there--I won't send it back.)

DGaunt

Careful about going higher than 9.5:1 unless you want to twin plug it. Jon @ EBS is a good source for parts AND advice.

SuperSport

Are the later Euro cars running 10.5:1? If so, how are they getting away with it without twin plugs as Dave suggests above?

Noel

I thought the later Euro SCs were running 9.5:1, but I will check when I get home.

944ZEN

Late euros was 9.8 C/R, only race engines with mechanical injection or carbs was 10.3 C/R and twin plugged.

1978-1979 911 SC (european)
2994 cc
180 bhp @ 5500 rpm
265 NM @ 4200 rpm
compression: 8,5:1

1978-1979 911 SC (US)
2994 cc
180 bhp @ 5500 rpm
237 NM @ 4200 rpm
compression: 8,5:1


1980 911 SC (european)
2994 cc
180 bhp @ 5500 rpm
265 NM @ 4200 rpm
compression: 8,6:1

1980-1983 911 SC (US)
2994 cc
180 bhp @ 5500 rpm
244 NM @ 4200 rpm
compression: 8,5:1


1981-1983 911 SC (european)
2994 cc
204 bhp @ 5900 rpm
267 NM @ 4300 rpm
compression: 9,8:1

Noel

According to the Porsche Red Book the above info is correct except the compression of the US cars was raised to 9.3:1 in 1980 and remained 9.3:1 until the end of the SC production run.

ruf fan

the diffrence euro to u.s.a. 911 sc model would be the exhaust, emissions, fuel distributor,and compresion.......

amso3

Greetings. I am the owner of an 84 euro 911. The 84-88 euro engines had 10:3 to 1 CR Mahle Pistons. Octane is definately an issue if you live in the western states that use 91 as premium fuel, 93 is the minimum I'd use in a euro engine. I did twin plug my engine along the way since it became a track queen and i was trying to gey more power. Today it has a stock 3.6 engine. I highly recommend this over sinking a lot of cash into a 3.0 or 3.2. BTW, the Euro 911s (84 and later) had a transmission cooler. This is a plus if you plan to drive track events.

944ZEN

Your 84' is not an SC as discussed in this thread, so that's another story. 3.2 litre engines cannot be directly compared to 3.0 SC engines. Different intake system, and engiene management by DME versus CIS.
But your comment's about 3.6 for HP seems fair, if you can get a 3.6 engine for a resonable price, and it's allowed in your area; f.i. in my country you'd have to pay tax to put in another engine, but not if you tune the original. So matter is not always so simple.