utkinpol

Could anybody comment on overall longevity of M96 motors on those cars?
How long do they last, in average? Are all you guys still on a first motor or had to replace already? If yes, what was the issue?

jrgordonsenior

Originally my 3.4 dyno'd at 250 when it was fresh. A year later that same motor with a GIAC street flash, on 91 octane, dyno'd at 272 at sea level, and 280 at the Nationals at Miller (4,400 ft). This was just before it split a rod in half after overheating (my fault). Thereplkacement 3.4 never dyno'd more than the 272 from the original motor.

My newest motor is a 3.4 case, cams, and heads with 3.6 crank and rods. It dyno'd at 304 on a Dyno Dynamics but has yet to see a Dynojet where I expect it to be around 320. Oh and TQ was 285 with that 304 rwhp ....

jrgordonsenior

I personally know of 3- 3.4 996 race cars with over 100k miles on the original motors....

Ritter v4.0

My car was a salvage title '99 with Porsche reman motor with 30k miles on it when I got it.
It had been in a minor accident but the insurance co wrote it off.
Year one was getting it set up and doing DEs. For the last two the car has been raced (maybe 6-8 events p.a.) and driven hard including several 2-4 hr enduros in ambient temps ranging from 35-105F ambient.

FYI we use Motul 300v oil and change frequently and cut open the oil filter for analysis. Touch wood- so far so good.

txhokie4life

Caveat -- I don't track 996's.

My mechanic buddy has rebuilt several M96 engines including a couple 3.4 and a few 3.6's.
I occasionally get my hands dirty and help a little.

Both 3.4 and 3.6's suffer from IMS issues.

Both suffer from cracked cylinder heads.

Both suffer from cracked cylinder liners -- but the internet scuttlebutt is that the 99's are more prone to this. I have personally seen one of each (3.4 & 3.6). (I was surprised on the '03 3.6)

From an oiling stand point the #6 rod bearing is what I hear is the weak link -- or at least where any oil starvation shows up.

The X51 sump is supposed to help as is an LNE deep sump kit.

Accusump might help -- but I lost a 944 engine to a rod bearing failure with one on -- so I'm not convinced.

If possible (Spec rules) I might consider adding an external oil cooler if I could figure where to put one.

Mike

utkinpol

M96 suffers from a lot of stuff indeed, but I was more interested to hear 'real' stats from owners who race their M96 based cars. So far it does not seem to be as bad as rumor mill has it.

jrgordonsenior

OT but since there's 996 owners here...

I have a brand new, still in unopened crate, G96-01 (02'-05') Gertrag C2 tranny for sale....

https://rennlist.com/forums/996-foru...nsmission.html