1990-964

Has anyone in the U.S. built up an engine using 9M parts? If so how did the cost of the parts compare with factory? 9M engines seem to make considerably more power but what cost? Displacement is not important as I have not yet decided on what route I will go with a rebuild.

Dwane

Contact Geoffery at Racetek Engineering.
Dwane

joey bagadonuts

Some of Geoffrey's projects are well-documented on this forum:

9M USA Dyno Chart

Just do a Search using 9m as your key word and Geoffrey as the thread originiator. Lots of good info.

race911

What's the end goal? Any way you slice it, you're looking at spending what your car is worth (or more) on an engine. Just on the top of my mind as I'm into some maintenance and repair on a $30K+ nifty Steve Weiner built 3.8 he did for the previous owner of my yellow car..............

cornerhans

Have you considered a GT3 motor;
a) water cooled
b) 425 hp
c) reliably thermaly controled
d) not maxed out to its limits

1990-964

I had given some thought to a water pumper but thought that the conversion would be a pain. The idea has many merits though.

NineMeister

A factory 996GT3 Cup race engine is power rated somewhere between at 380-410 hp (dependng on year) and is scheduled for rebuild every 30 hours.

Geoffrey's original 9m 400hp 3.8 litre race engine powered his 964RSR easily past Cup cars in a race, it never ran as hot as a factory turbo engine on track and after 100 hours running still made within 5hp of it's original dyno number. I would not say that this engine is "maxed out to its limits" ...

cornerhans

Hello Colin- Could the two options pencil for the customer comparativly. Not refering to a cup motor but a factory GT3 motor from say a 2009 GT3 for example.

cornerhans

And could the GT3 or water cooled 996 motor to the 964/993 be what the 3.6 was to the pre 89 MY as relates to the popular upgrade?

I know it's been mocked up several times but would be nice to see the conversion parts from someone like yourself.

Geoffrey

I worked with a shop that installed a speedvision GT3 Cup engine into a 1969 chassis race car and later was converted to a 996 GT2 engine. I did the MoTeC programming on it, and the fit did not require much modification. However, I'd rather build an air cooled engine for the 964.

My experience with the 9M parts are that they are what they are represented to be. I've flow tested the cylinder heads against the many stock and modified stock or RSR cylinder heads and the 9M heads were significantly improved. I've run the rocker arms through testing on a Spintron machine and developed new camshafts specific to these rockers. The rockers allow for signifcantly improved valve lift, acceleration rates, and peak velocity due to their longer pad design and lighter weight.

shockm

All I know is.....I have a huge grin on my face everytime I drive it!

NineMeister

First of all, it is only the 996 GT3 and 996 turbo engines which could be used as these have the same G50 gearbox stud pattern. No offence to 996 owners, but in comparison to the GT3 motor the 3.4 & 3.6 engine is a lemon, so for me it's definitely not even worth considering. Besides, for road cars you would probably want to retain the factory GT3 ecu, so it would be a lot of fun attempting to hook up the 996 ecu, central informer & alarm system into a 964 in order to get the kit working.

As for a popular conversion option, I seriously doubt that it has any mileage although there are always those who will tackle the job on an individual basis and be pleased with the results. Thanks, but no thanks, this is definitely not something that 9m will be interested in pursuing, given that (to date) I have probably invested close to $250k on developing the aircooled platform and have enough positive results to prove the 9m aircooled strategy as cost effective.

cornerhans

Colin, you fellas have done a fantastic job with the aircooled platform and deserve a return on your investment and will for years to come.

I do hope that the water cooled transplant does gain traction (for a varity of reasons). I for one would be interested in the conversion as an owner of two of these cars.