I am not sure but I think that the ls head & type R pistons will not
give you 11 to 1 compression. check on that before you do the job.
give you 11 to 1 compression. check on that before you do the job.
Huh??? I'm still trying to figure out what you're talking about.hybridone said:USDM ITR: 10.6:1
JDM ITR: 11.0:1
LS: 9.2:1
I wouldn't recommend dropping just the pistons. Pistons should be put in built motors. That would be like dropping a turbo and boosting like 15lbs with no intercooler. Everything works together and installing one component will not be beneficial.
Also, the Type R pistons will fit, but the piston has to be cut to be installed onto the LS crank. And, not to mention the LS crank will be under tremendous stress with the new psitons. I wouldn't recommend this considering the crank runs about $1000.
-John
What she probably means is that unless you have upgraded cams/valvetrain and a better flowing head, you probably wont see the full potential of that 2 points. It will obviously give you some horsepower, but it will be very limited to what it could be.First of all you are telling me that putting a full 2 point higher compression pistons in a LS engine won't do anything? I find that hard to believe.
it doesnt matter what you believedeMad10 said:First of all you are telling me that putting a full 2 point higher compression pistons in a LS engine won't do anything? I find that hard to believe.
Yes, that's what I meant. My mind wasn't totally into the thread when I posted so sorry for the vagueness. Yes, all cars do have pistons, what I meant to say was that it would not benefit him to just drop higher compression pistons without having other work done to the motor. This is just my opinion, I never said it wasn't do-able. And I messed up when I said the piston had to be cut to fit the crank. When I called Pann Auto in San Diego about 2 years ago to inquire about the LS/VTEC swap, I told them I wanted to drop JDM ITR pistons and they said that I could do one of two things: 1) Cut/modify the piston to fit onto the LS conrods (sorry for the mistake again) or 2) Machine the crank and install the ITR pistons and conrods. They said that option 2 would compromise the life and performance of the crank. And if you call Acura, the price of a brand new crank is around $1000. I realize nobody would pay this and you would probably find it used, but it is still this price so I don't think I was wrong there.NOSed_b18b said:
Huh??? I'm still trying to figure out what you're talking about.
First, pistons are in all cars, not just built engines. I dont understand how just replacing pistons will be the same as "dropping a turbo and boosting like 15 lbs. with no intercooler". Please enlighten me. If you mean that you need certain work done such as honing, or balancing before your pistons can be put on, then, yes, you are correct. But if you mean just replacing a different piston, then no sir, you are not correct.
Second, when did you have to cut a piston to fit directly onto a crank?? Hopefully, that was just a typing error . Besides, I really doubt that changing a c/r of 2 points is really going to ruin your motor. If anything, I would think you would worry about your rods or your cylinder walls before your crank. Even if you did somehow "break a crank" or something, a new small block will run you considerably less than "$1000". I can find one for a few hundred or less.