Thegman

Just wondered what the differences are between the two engines in say a 2004 or 2005 car. Where does the xtra horsepower come from? Cam? Intake? Compression ratio? How similar are the engines structurally?

Mr Michael B

Holy smokes. The differences are huge. Even the basics are different. I could write for ten minutes and still have differences to tell you about. The GT3 uses the 3.6 liter engine from the 911 GT1 whereas the standard 996 engine is a pedestrian unit.

I think a web search is in order.

Thegman

OKAY, How about just the high points.......

jim3

They are both 3.6 ltr horizontally opposed water cooled engines assembled in Germany. Other than that, everything is different. The highlight as Michael B wrote is that the GT3 is based on a race engine case and has a dry sump and the 996 engine was designed from scratch as a street engine, wet sump and all.

yetis

Stolen from wikipedia:
"Most important of all was the re-tuned engine. Although it shared the same basic displacement as the 3.6 litre flat-six cylinder that powered the standard 911, it was based on the dry sump GT1 racing motor. Porsche made significant modifications to the heads, intake, exhaust and computer control systems. In addition, Porsche used a specialized manufacturing process on the GT3's engine; standard 911s use a two-piece engine block split down the center line of the crankcase. On the GT3 the split-crankcase parts are cast separately and bolted to the two blocks of three cylinders per bank, a design that was originally developed specifically for racing applications that makes the engine stiffer and capable of producing more power."

Mr. C4

Why the comparison?

99firehawk

ton asner the next question

no you cant amke the same power by changint hte parts as they arent interchangeable

Mr. C4

man you need to work on your spelling!

jimculp

lol "interchangable"-no problem, but "make" and "the" give him fits. Just messing with ya firehawk.

RK1

I'm often asked this question from folks who are new to the Pcar world. Its a false assumption that the GT3 motor is just a tuned up 996 motor. Its NOT.
Just to make a long story short. A 3.6 996 crate motor is about $10K to $12K. A GT3 crate motor is over $40K.
That should do it.

K1

///Mous3

Tell me about it! The same questions to my M3E30 and M3E46. Apart from cylinder count, the list is long on differences, short on similarity.

///Mous3

I bet he buttons his shirt all wrong.

JEC_31

OMFG.

I did not know that. That's gotta be a very bad feeling, if you miss a shift...




Hey now, he just thinks faster than us.

99firehawk

I dont get a lot of free time to answer questions, and i have to do it well still doing my job and answering 30+ pms a day

gt3_002

I was told the 997 Carrera S or C4S is faster than our stock 996 GT3? Is this true?