cosmos

I keep seeing that you should rebuild the Cup Engines about every 30 hrs, but they can go up to 80hrs without a proper rebuild.

My question is, why is this not neccesary for the street GT3's. Are they not essentially the same engines??

jrgordonsenior

It's the R, RS, or RSR's that PMS recommends a 30-35 hour rebuild for. That's mainly because they have crappy pistons and rings. The recommended teardown for the standard cup engine is 80 hours according to Porsche, but 100+ is not unheard of. Remember they're racing almost 100% of their hours.....

Sean

Do street GT3s have a maintenance schedule that's dramatically different from other 996?

I realize GT3s utilize a different engine block from a M96-powered 996. Just curious if the maintenance schedule is more involved with a GT3.

GreigM

No, schedule is pretty much identical.

Christer

Racing is 100's of times more wearing than street use. Approximately.

ngoldrich

FWIW -

When I did a _lot_ of research when deciding if I would race a GT3 cup the following is the reality after talking with many race teams -

(1) If you will do DE only and dont push the car/engine then the cupcar engine can last 80 hours.
(2) If you race hard (like I do), the engine must be rebuilt every 40 hours to remain competative.
(3) A sprint RS/RSR engine is 25-30 hours

Again, if you do not push then engine & racecar, then your time between rebuilds can be longer - just so you dont overrev much.

Norm

cosmos

OK, still no answer on the GT3 street engine as far as track hours and rebuilds.

Bill - Chicago

The street engine is no different than the cup engine, if you have 80 to 100 track hours, not street hours. I would do a leak down, oil analysis etc to see if it needs to be rebuilt.

ArcticFox

That sucks...anybody wanna buy a slightly tracked GT3?

FixedWing

Isn't this about competitiveness rather than reliability? I don't hear people claiming that any of these engines will blow if not rebuilt in that time period. I liked Bill's suggestion that tests such as a leak-down test and oil analysis should govern. Now, if getting the last ounce of performance out of the engine was critical, then I can see rebuilding it with new valves, seats, guides, etc.

Stephen

Fastest928

The piston pin bosses take a lot of pounding at 8000+ rpm and are known to fail. Strife testing at its finest. I have seen a few pistons that had small cracks in the bosses. In addition, the pins are very high on the piston, low compression height, and combined with a short skirt, will tend to wear rings and skirt quckly at high rpm and load.

Has anyone seen a street GT3 and a cup piston side by side? Any difference in the pin boss dims?

Regards,
Marc

Bob Rouleau

What's the question? My Gt3 has a 4 year warranty track or not.

FixedWing

Does it Bob? Or are they just turning a blind eye to it ... for now. Remember PCCB's. I've known lots of denied warranty claims on tracked GT3's outide of North America.

Stephen

Z06

Who rebuilds the GT3 engines?

Mongo

Marc you have a good point about the pounding those R, RS and RSR motors take at that RPM. I'm curious to know what would happen if those motors had street use with minimal over-revs at 8000+ RPM, and its reliability compared to the GT3. I'm gonna look up the differences between these engines. It would be awesome to have a GT3 RSR motor in a GT3 street car