Alright so I'm running a stock ls boosted right now and really want to go ls-v but since ls motors are really only safe to around 300whp I see no point in spending all that money on just a head for a 40whp gain on a stock ls bottom. So I have a chance to pick up a built itr block with eagle rods and je pistons "11.1". It has a gsr head on it with omni valve train and gsr cams. I'll be running an aftermarket intake manifold. Probably a skunk 2 since I can get them used relatively cheap. I know boosting high compression can get risky on pump gas b/c of knock and it limits the power you can make but I've seen it done plenty of times with great results around mid 300's on stock motors. My question is would it be safe only aiming for high 300's-400whp on 92/93 pump gas since it has internals or should I ditch the pistons for 9.1-10.1 and re-use the eagle rods and go that route. I don't drive easy either. I figure if your going to build a car then use it for what it was built for and that would be actually driving it.
So setup would be b18c block with rods and 11.1 pistons. Precision SC-34 turbo at 12.5psi and stock cam gsr head with oem gasket. Thanks for any help that is given.

 

you can run it at 11:1 but knock will be an issue on pump. try it. see what you make and if need be turn the power down alil bit to keep it safe. if you do decide to change the pistons, im going to say to invest in some springs and retainers too now so you can tune for 600whp without worring about dropping a valve @ 400 whp.

 

If you plan on running pump it can be done but its very risky, a bad tank of gas and your going to have problems.

My new motor is 11:1 but I plan on only running Ethanol and Race Gas, I wont even consider pump gas.

 

Did you just look at the title and reply? I already mentioned I know I'd be limited due to knock on pump gas and I already said that the head has omni springs and retainers. I'm not trying to be a smart a$$ I was just curious.

 

Just make sure joe schmoe who has a dyno down the street doesnt tune it, if you want to press the envelope you need someone that has done it before, make sure they check and re-check the plugs. If I was in your position I would either install a thick headgasket to drop your C/R or swap pistons for something in the 10:1 range.

 

Yeah I have a tuner that is capable of doing it just gotta make my decison on what I wanna do now. I know inline pro has a thicker headgasket available just don't know the pros and cons of running one.

 

Like i said before, its not worth "trying" it. yess it can be done but your riding on thin ice and all it takes is a bad tank of gas an that motor is history.

 

Yeah I understand what your saying. That's why I'm looking into running a thicker headgasket to lower compression. Inline pro has a 2mm gasket that drops it down to 10.1 so in theory that would make it better suited for boost correct? Honestly I'm probably going to pick it up and put it on a stand and redo it over winter. I don't trust used stuff unless it's from someone I know. It's a good price and it will give me a block and rods plus a vtec head with springs and retainers. I can sell off the header and pistons if they are in good shape and make some money back. Plus then I will know it's all been redone with new parts.

 

Eh I personally don't care for thicker gasketsbut if your comfortable doing so then rock with it. 10.1 is fine

 

no i ment what i said and i do consider you a dick for replying period. so let me clear this up. i stated you will be limited on pump. you know that but yet you still made this post......? 2nd ill stand behind what i said as far as investing in springs and retainers over the omni bullshit you are running seeing that omni springs only have 57psi spring pressure which is fine for all motor but are too light for turbo. stock itr springs are rated at 50psi just for reference. at higher rpm and boost levels it wont take much to drop a valve as stated the first time. smh

 

That's fine consider me what you want. It really doesn't matter to me honestly. All you did was regurgitate what I already posted initially. I know about knock and it has upgraded valve train already. So please tell me what part of your post was helpfull. Thanks to everyone else that is giving me good input.

 

unless you can buy this built block for SUPER cheap, why not build the ls block?? If your goal is 300-400whp (that's what you seem to be saying), save some money, build the bottom end on the LS and call it a day! My $0.02

 

last time i checked there are plenty of s2000's out there that are turboed and running on stock engines and stock head gaskets. s2k's are 11.1 compression