2.0 build
 

I want to pull the engine in my 66 911 this winter to reseal it and do some needed maint. I was wondering what perfomance additions could be done on a low budget. I was told i could run the s pistons for higher comp, but i have not been able to verify that. I am not looking for a full race car engine just wanted to free up a little hp since the engine will be out. Any ideas, thanks

You already have good cams in there (Solex) but "S" pistons will help you with that CR increase. Be sure and have the distributor recurved to suit.

If your looking to make a really pleasant engine that makes great power, install a set of AA 86 mm cylinders with JE pistons. 66 stroke x 86mm bore = 2300 cc
They come in two different compression ratios and are reasonably priced.
It will require that you machine the heads to suit but if you're doing a valve job it's an easy job.
I would run the lower compression (9.0:1 ?) with your Solex cams and you'll have a great little motor for slightly more than changing to "S" pistons.

I am leaning towards lower compression ratios because fuel octane is getting worse and I assume the Greenies will eventually figure out that lower octane fuel is the best way to get old cars off the road.

2.0 build
 

I also forgot to mention that i do have webers on it. Is AA the brand on cylinders.

AA is a brand of after market Biral barrels.

Search here under tag 901/05 for info on my '66 2,0 rebuild. 86 would be great.

To save you a little searching, volktek, here's 304065's first thread on his 901/05 rebuild. It's a full exploration of what the options are with a small displacement 911 engine. A very full exploration-- I think he changes his mind in every post. :)

I am thinking about doing a rebuild on a 901/05 engine I have in the shop now. It came out of my '66 when it started to smoke a bit at idle. My rebuild will likely be pretty vanilla. I'm sure there are more horses out there, but I am just happy when my car doesn't make like I'm part of the county mosquito abatement squad. (And besides, if I built a big hp motor, I'd have to actually do something about those weedy brakes.) But I will be watching the thread to see what you decide on the bang-for-the-buck question.

2.0 build
 

thank you all for the great information

2.0 build
 

If i use the 86mm aa cylinders what kind of head work am i looking at? What is the stock compression ration of a stock 2.0?

Henry can tell you because he does it all the time, but to go to 86 you would need to machine the cylinder-to-head mating surface to accomodate the 1970- seal. The later heads used a CE ring to seal to the cylinder, whereas the earlier 2,0 had a metal-to-metal seal with a gasket as the backup. You would also need to chamfer the combustion chamber edge like the later ones.

If I were going 86 (see the thread in which I consider many alternatives and then settle down on original :)) I would use 2,2 heads or later. These have larger valves, the cylinder mating surface is already there. They have a smaller combustion chamber and a different valve angle which is better than the early heads.

Stock compression ratios were 9.1:1 for the 901/05 Normal and 9.8:1 for the 901/02 S motor.

Thanks for the info