Good Info JG.
Marcon,
I’m not a builder so I can’t advise on how to do these mods. I am in long rebuild using / having used most of these items, but I’m No expert.
I would strongly consider talking with someone like John Milledge
http://www.jmengines.com/index.htm. He’s built some fun engines. Better yet, have him build the whole thing and go grab a beer and watch a game!
Broad Foot Racing in Florida use to do a lot of Engine work, but I don’t know if they’re still around?
Also don’t take his, mine, or anyone’s word as gospel. Get several opinions as it sounds like your doing.
But if you don’t take the easy way out…
Here’s a previous post that had some engine upgrades for a 2.5bottom end..
http://forums.pelicanparts.com/showthread.php?postid=2757682#post2757682
Options for the 944S2:
Sell the 16V Head and put on a Turbo 8V and full Turbo stuff including Computer
(DME + KLR). Water and Oil passages need slight machine shop mod to fit. DME. Buy a junked Car and rape and pillage what you need from exhaust to Intercooler. Price $3000+??
Or you could maybe find a 968 Head with Vario Cam (like V-tech) + DME and instant 30HP
Or do a pro Turbo Conversions
http://www.powerhaus.com/
Add a supercharge Kit from someone such as Speed Force Racing (SFR) about 100 hp and $6000.
http://www.speedforceracing.com/productsporsche_engines.php
Bore the 3.0L to a 3.4L and add those higher CR pistons. Say Custom made CP’s at 108mm. If you go above say, 11.5 CR you will need to use only Race gas or ping ping boom. The Knock sensor will retard the timing a bit to compensate some for lower Octane fuel. Custom piston ring Set, Custom Copper Gasket. From what I’ve gather Stroking this Engine is a lot of work for Min results. I was told this because the way the position of Wrist Pin. Also the clearance of the Connecting Rod on the bottom of the block. They can do a staggered Crank Grind where is effetely positions it’s center further from the center of Crank, thus increasing Stroke. But all the stroker options are a lot of expense for little result.
Lindsey Racing could do an extrude porting of your intake to increase flow velocity + valve work.
R & D Springs (Don) Very knowledgeable, Consults for Lindsey Racing among others:
www.rdvalvespring.com
Custom Springs to match new Cam Grinds and light weight Retainers = faster rev. Also he makes Solid Lifters that are much lighter and better for high RPM’s
17710 Bango Ave
Hesperia, CA 92345
760) 948-4698
Head Sleeves, Wrist Pins and Pistons, Rings…
Circle Performance (John) 508) 580-5844
http://www.cppistons.com/Catalog.htm
Camshaft Re-Grinds for Bigger , faster Lift, but rougher idle.
http://www.webcamshafts.com/
This stuff is not experimental! Each vendors has catalogs with Porsche 944,951,S2, & 968’s parts and specs. I had to dig to find these guys thoe.
Probably cause it’s all expensive.
Add a chip, electronic Air/fuel management and exhaust.