3.6

[1975porsche]

I have a 1982 roller in the garage , Was looking at purchasing a wrecked 1991 c2. Is this engine a good fit or should I look for a 3.2 . Are the 964 engines okay any problems I should look for , Thanks in advance ,

[tonythetarga]

While not an expert in the 964 engines I will say they are good engines. They did leak oil and many needed to be resealed. The one thing to note is that they are twin plugged and so, the distributor has a belt drive to operate the second rotor from the shaft driven rotor. The sparking inside the distributor causes ozone which deteriorates the rubber belt drive. Porsche fixed this on the 993 by adding a vent tube to 'flush' out the ozone and blow in fresh air from the fan. The retrofit is necessary for the 964 but the rubber belt inside the distributor is still susceptible to ozone breakdown over time. The distributor will need to be rebuilt every 10 years or so. If you do the transplant, I'd put in a new distributor from the get-go so you know what you have and then also make the vent tube connection to extend the life of the belt inside.

[safe]

A 3.2 is nearly bolt in, a 3.6 requires more work and costs more money, engine cost aside.
But a 3.6 is a nice engine! Any engine you buy might need a rebuild.

[mfyoung1086]

the 3.6 would be a blast in that car, but as the old saying goes speed is money how fast ya wanna go? the 3.2 can be done cheaper and faster than the 3.6

[will hung]

A 3.6 swap is something I go back and forth on. I'd love to do it, but then the reality hits ($). Check out the link attached below, Steve has a cost estimator part way down the page. I don't want to discourage you, but I want you to go into this with your eyes open. And remember, the cost estimator does not include anything rebuild-wise. That's a 21 year old performance engine.

Also, I know the early 964 engines had no head gaskets, but Porsche recalled them to add the gaskets and started adding them to all 3.6L engines. There are still some floating around without head gaskets. It would be worth a look on this engine.

Instant-G 3.6 Liter Conversions

[1975porsche]

Thanks for all the advice , will hung thats a great link should be of great help Thanks for all the help , Glenn

[umgang]

I have a 1975 911S that i transplanted a 3.6 into 9 years ago.
The car is an absolute joy and still makes me grin like a kid when i drive it.
The 3.6 is not just 0.4 liters over 3.2.
We are talking an 11:1 compression ratio with twin plugs.
We are talking about improved dual feed intake plenum [ or if it is M64/22 it has Varioram three
stage intake].
And more grunt in the lower ranges.

But all the folks above are correct.
And this is the thing>> once you get over the giddiness of the power to weight,
you realize the balance of the car: motor, suspension, brakes. is now off.
The 3.6 added 40+ pounds to the tail and the power overwhelms the brakes and the suspension.
These are important points since a good brake set up and a good suspension set up will each
cost you what the motor will cost.

I wouldn't trade mine for anything. It is totally adjustable, neutral in it's handling, never bucks or grinds. I have cross country driven it, i have raced it PCA Club Racing and NASA - been dependable, bullet-proof, and what a ride.
It's a long road, and there's no turning back.

BTW_ Steve Weiner @ Rennsport Systems helped me with all my ancillaries to the 3.6 transplant.
His knowledge and experience are an education unto themselves. And he will work with you project or piecemeal over time. Rennsport Systems | Porsche Performance Systems and Support ph: 503.244.0990