Q: possibilities of upgrading a 67 S engine?

[Anthony67_911s]

Hi,
I am looking to get the correct 2.0 67 S engine for my car (currently it has a 2.2 T engine in it which has been performance enhanced to perform like a 2.2 S). As it is quite likely any engine I will be getting will need to be rebuilt, I am wondering if I should have any performance enhancements made at the same time (i.e. while I am at it).
My question is: what is worth doing, what would create a lot of additional cost, and what would not? What can at all be done to a 67 S engine, and how much performance improvement can be achieved by what measure?
I don't need to do anything really extreme. It should still run ok at lower revs, and I do not plan to race the car. But if it could produce 10-20% more horsepower and more torque, that would be great.
Thanks so much for your help!
Anthony

[ttweed]

What can at all be done to a 67 S engine, and how much performance improvement can be achieved by what measure?

If you look at what the factory did back then with the 2-liter motors, they ranged from 160 HP for the stock S (Type 901/02) engine to 220-230 HP for the 906 (Type 901/20 and 21) race motors. That will give you an idea of what can be done, it's just a matter of how much increased cost you can stomach and the amount of reliability/driveability you desire. From your comments, I would stick with a stock S rebuild, with perhaps the factory "Sportkit" upgrade, which consisted of carb tuning (2mm bigger main venturis, the tall secondary venturis, and rejetting) along with a sport muffler. This was advertised at the time as a cheap way to increase the performance of the stock engine by perhaps 10%, but realistically, I think it is probably 10 HP at most.

The other changes required to get the substantial increases of the 906 engine require considerably more $$$ and effort--higher compression pistons, bigger cams, bigger carbs or slide valve MFI induction, and porting/head work, all designed to get the engine to spin faster and breathe better at higher RPM. This will result in a less long-lived package overall, however, which will also be less driveable in "around town" conditions. I would leave those types of engines for the race cars, if I were you. The stock S motor is a sweet little package. You don't really need anything else, and it sounds like you already have a hotter 2.2, and are going back towards stock anyway.

YMMV,
TT

[304065]

Anthony, you may be interested in my saga of discovery here: http://forums.pelicanparts.com/showt...ht=suggestions

[jaudette3]

Using the original aluminum case, the engine in my '67 has been rebuilt to single plug 2.7 liter specs. New RS 2.7 pistons and cylinders were installed (two 2.7 engines were purchased to find a perfect crank and rods). It has 930 cams and is equipped with an oil cooler and a 12 quart dry sump system. It's fitted with Weber 40-IDA carburetors that have been modified to 42-IDA specs. I run a sport muffler on the street and a Monte on the track.



It's pretty quick - with short gears 0-60 is under 6 seconds.

John

[Paul Schooley]

What I would ask here is the motor you're currently running all that bad? Considering the amount of money spent to find a marginal amount of hp can't really be worth it can it? Alternatively, have you looked at shorter gears for a bit more zip? I find myself always lusting after more hp but have to question how much I'm willing to spend to get there.