At this point it looks like im just going to rebuild the motor that's in the car as I can't seem to find one to drop it.
It's obviously never going to be a race car, but I wouldn't mind having a LITTLE more power then the lethargic 115hp that it is. I heard dropping 2200 pistons in this motor will increase the compression in the neighborhood of 11:1 or so. Is this ok to run on 93 pump? Anything else required like rods/etc? What kind of power would it put down? I would imagine it would be decent as that's a large jump in compression.
Thanks for the help so far guys.
1994 Pontiac Trans Am 6-speed
Vortech V1 @ 7psi, Eagle rods, Low compression pistons, Comp Cam, Ported Heads, Roller Rockers, Ported Intake Manifold, Holley 58mm TB, 42# Injectors, MSD Optispark, MSD Coil, F.A.S.T ECU, Crane Cams Ignition, Mid-length headers catless, Hurst shifter, Adjustable panhard bar, ZR1 wheels. She gets the job done.
Not sure how many people have actually done this yet....
Bob guptill as well as a few circle trackers do it. Unsure on longevity though.
Hmm...
I'd like to find out soon as im going to start pulling the motor out tomorrow if all goes well. The main bearings took a crap on me. Probably having the crank cut and getting new main/rod bearings for it and figured while im that far, why not try to bump up the power a little bit?
1994 Pontiac Trans Am 6-speed
Vortech V1 @ 7psi, Eagle rods, Low compression pistons, Comp Cam, Ported Heads, Roller Rockers, Ported Intake Manifold, Holley 58mm TB, 42# Injectors, MSD Optispark, MSD Coil, F.A.S.T ECU, Crane Cams Ignition, Mid-length headers catless, Hurst shifter, Adjustable panhard bar, ZR1 wheels. She gets the job done.
BoostedTurd wrote:Hmm...
I'd like to find out soon as im going to start pulling the motor out tomorrow if all goes well. The main bearings took a crap on me. Probably having the crank cut and getting new main/rod bearings for it and figured while im that far, why not try to bump up the power a little bit?
Go to S10forum.com and do a search. There was a guy who swapped a pre 98 head on a 98 and newer block. He had problems with detonation, which indicates that it would need to be tuned or a hotter cam installed to lower the dynamic compression ratio.
Also search this site and S10 forum for anything by "mad Jack". He says that zero decking the block and shaving the head about .030" will have the same effect.
BTW, the bearings went out most likely because the oil pump wasn't doing its job. That's what happened to my 95 cavalier 2.2OHV anyway. You can put the 93 and earlier oil pump on it for more pressure and volume. It's the M98 IIRC.
My local advance auto had the crank in stock but I'm saving it for a build up eventually of the engine. In the meantime I just went to the boneyard and got another engine with 80k miles on it. I ran it for about a year before the head gasket started leaking coolant. It is apart in the garage right now for cold air box w K&N cone filter; battery relocate to the trunk; bigger exhaust; MegaSquirt 3; and Z24 rear suspension.
dennis
He had detonation because the crank on an 98 and up has the crank reluctor advanced slightly, so now u have more comp and more timing. I would think 11-1 eould be fine on good fuel. What year car is it. A 97 can be tuned so 11-1 would be no problem at all. While you're there, build the head....
http://www.j-body.org/forums/read.php?f=2&i=472589&t=465239#472589
I would not recommend doing this. I had the 98 pistons in a 97 motor because the wrong pistons were put in my kit. Severe detonation problems to the point that two of the piston ring lands were broken off between the top and second compression ring. Add to that a broken crankshaft right behind the last rod journal. This was in a daily driver car, and the only way I could stop it from pinging was to add about 3 gallons of E85 to my tank when I filled up, but I figured that out after I had run it quite a while and I believe the damage was done by then. The compression ratio comes out to about 12.4-1 with the 98 pistons and 97 head. It would be OK with a very long duration cam and racing fuel with a proper tune. Any other way I would avoid this setup.
