Hi everyone. My first post to this forum. I'm a Mazda guy, but I'm now gettting into a Nissan for the first time. My stepson, military man, just came back from oversea's for a 30 day leave has a 240sx. To make a long story short, he broke a piston and now has a replacement junk yard engine. I'm going to build the other engine for him while he's gone. Also going to put together some upgrades for him on other things. The broke motor had been bored to 85.5. It's going to rebored and sleaved for a larger piston. What size would be recommended, 88 or 90 mm?

Any comments? Let me say that it's going to be a "built" engine. Not going to cut many corners. Thanks

 

first off welcome to the forums.

2nd. since your going to build the motor up good, i think you should use bigger pistons, meaning you'll need it to be resized to 90mm. u only want 375HP?


if you build the SR properly you'll be able to push alot more then that.

Good luck! and keep us informed of the project.

BTW PICS!!

 

Thanks for the welcome!

Well since I'm unfamiliar with the potential of this unit, we were discussing the 375 range. It's going to change with what we do to it. I'm in my first phase of research. First I wanted to set the piston size. I don't know much about these sleaved blocks. What would be the largest safe piston size? 90mm?

I have a lot more to do.

Thanks KMag

 

i havent built an SR20 (cus i took the KADE-T route) but im guessing that bigger is better if your going to build up the rest of the motor. I kno others will post bout the best size and such.

There have been SR20's that were built and were able to hit 600+hp and depends on Turbo and how much boost ull be running. But so much HP isnt needed. depends on plans for the car. 375-400 HP sounds good thats my goal rite now with KA24DE-T

 

Thanks Slidin240. I think I'll just work around the 375 to 400 range. He's only going to drive it when he comes back to the states, which is only a couple times a year. I know he wants something that's streetable, not too much over the top.

Anyone else have any info the max safe size piston?

Thanks

 

well, if you have someone bore it and sleeve it, you can slide 90mm pistons in, which will make the motor and SR22. I believe darton makes 90mm sleeves that will work for the SR. check out http://www.lsauto.com/default.asp

 

Thanks revolution. I take it that it would be a 2.2 liter with 90 mm pistons? I'll check out SR.

Now, on to rods!

KMag

 

check this site out, they have everything you can want for this motor and they are very good people and easy to do business with.

www.heavythrottle.com

 

Thanks everyone for the links!

KMag

 

heres a couple more:

http://www.jgycustoms.com/

http://www.enjukuracing.com/

http://www.aspecproducts.com/


also heres the FSM for the SR20

http://www.zeroyon.com/TheSite/techservice.html

 

Thanks Slidin!

You are very helpful!

KMag

 

like it says under my SN, im here 2 help

- Golam

 

you should do the next size up. not the biggest. it doesnt leave much room for rebuild if something happens again. if you do the larger then resleeving would be in order if something goes down. just build it to min. size then get a turbo thats appropriate to your app.

 

Thanks bottombunk,

That's what we came to the conclusion too. Looks like we're going to resleave, use 88mm pistons. That would give us some room for rebore later. We're still trying to decide which brand piston and chromealloy rods to use.

We've got several requests out to several different shops for pricing. I hope to hear back from them next week so we can send the block out to get the sleaving and boring done.

Thanks for the info. KMag

 

ross and pauter if you can afford them