At what point do you need to sleeve a motor? I am thinking about buying a GSR block locally, and I can probably get it for around $1000, it is rebuilt, has a block guard, 11.5:1 pistons and ARP rods and bolts. Cant remember much of the details.

The only thing I am hung up on is it is not sleeved. The guy was obviously building it, and then didnt sleeve it. My plans would be to SC it eventually. I am not going for anything crazy, but I would like the option to push the motor to 250 whp. Is this a safe number to shoot for without sleeves? 11.5:1 and a supercharger makes me wonder too....

 

if you are charging it, only if you putting an *** load of spray on top of it, would i worry.

250 wheel is more than attainable on stock sleeves.
i made 230 on 9:1 internals on a b16 with 7psi and an fmu 5 years ago.

the 11.5:1 with boost is all in the tuneup.

 

no, no spray, this is an AutoX car. Maybe once or twice to the track just to see the number, but AutoX is my thing. So if 250whp is completely safe on a good tune, what number would be pushing it? How about 300whp?

 

The only problem would be in the tune as the only solution would be as well.

With 11.5:1 compression, your detonation window is significantly smaller and one tank of bad gas could kill it. That being said, 11.5:1 boosted 300 whp could be just as easily attained as it could be on 10:1 or 9:1, BUT, a change in temp and a crappy tank of gas with a bit of water in it and it's bye bye sleeve because of how much easier than motor will detonate than a lower compression motor. It would have to be a VERY conservative tune on the timing.

 

I guess it would probably be easier to just get a little bit lower compression pistons. Better safe than sorry. How about 10:1, would that be a better choice?

Edit: and are there any good resources for superchargers, general info, how-to artictles, that sort of stuff, I searched on here some, and didnt find very much, lots of turbo stuff, but not so many SC threads

 

You are probably gonna be better off with a turbo that is properly sized. Not this dyno queen **** that you find here.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiKid86 &raquo;</TD></TR><TR><TD CLASS="quote">You are probably gonna be better off with a turbo that is properly sized. Not this dyno queen **** that you find here. </TD></TR></TABLE>

what are you talking about?

 

you need to sleeve a block when it looks like this

476whp stock sleeves

 

I don't really think sol2hatch got the answers he's looking for.
Stock sleeves have been proven to hold-up to a ton of power, but it all comes down to who is tuning.

For your goal of 250whp, sleeving is not really neccessary being you have a solid tune. I suppose you could say sleeving is more of a "safety margin" now, on anything below 650 to the wheels. Needless to say, I will have my motor sleeved for my build for peace of mind.

For the purpose you stated of the car, I would drop the compression a bit, and look into a super efficient setup. JRSC or something like a 28rs would be sick for auto-x.