3.2 piston &cylinder sets

Hi,
Can anyone advise of the largest capacity piston/cylinder sets that will be a direct bolt on for a standard 3.2 motor? I have read in B.Anderson's book that 3.4 is readily avilable and commonplace. I am looking at adding capacity and compression during a top end rebuild. I was originally thinking of euro spec 3.2 piston / cyl. sets but am now considering more capacity & compression. Also, whats the limit on compression before needing twin plugs? The euro 3.2's ran 10.5:1 with single plugs, albeit on higher octane gas. Would a 3.2 liter with 10.5:1 work ok on premium gas (93 octane) with single plugs? Any advice / ideas much appreciated.

I took the liberty of clicking the sun glasses and see that you live in Texas. I don't think I would try high compression living in a hot climate. As you know heat will only make the situation worse. It is my opinion that about 9.8:1 is about all you're gonna get out of single plug heads on premium gas in hot weather. Detuning and a killer cooling system will help of course.

I agree with Rarly8. Stay away from the high compression unless you are going to run 100+ octane fuel. Use bore and stroke to extract more hp. I have a 3.2 also. I am going to stroke it to 76.6mm and bore it to 98mm or 1o1 mm , should make around 270-280- with the dme, 3.5 to 3.8 liters, still
thinking about.
DRD

Good point guys, never really condidered the heat aspect of a high compression conversion. DRD, any info. you can share with us on the crank, cyl & pistons you will be using. Is the Turbo crank the one with the 76.6mm stroke?
Cheers

I have a 78SC. The pistons and jugs were swapped out to increase the displacement to 3.2L, and the compression ratio to 9.6, or 9.8 I can't remember which. Under normal engine temps the car runs great with no pinging, but after hard driving, especially on hot days, and when the oil temp gets up to about 195-210 degrees, the engine will start pinging at higher RPM's when getting on the throttle. I'm not monitoring head temp so oil temp is all I can go by. I always use 93 octane gas. As I see it my options are:
Retard timing (which makes it run crappy until hot), add octane boost (haven't tried it yet), change the advance curve on the distributor (again runs crappy until hot at high RPM but unchanged at low RPM), somehow keep those heads from getting to that temp, or going to a lower CR piston, or never drive m-y c ar * h a r - d...
Excuse me I was laughing a little on that last one

Just my experience,
Leon


[This message has been edited by leon (edited 07-28-2000).]