I have a b16 engine in my car with 100,000 on it and a gsr block ready for a rebuild, what I want to do is re-ring the pistons from the b16 and put them in the gsr block. I'm planning on doing a complete oem part rebuild to the gsr. I'm looking for an 11.5:1 cr to go with my s2s2 cams. Is there any problems with reusing the old pistons, or is it really worth buying new jdm type-r ones?

 

And do the pistons ever get damaged when the wrist pins are pressed out???

 

i never done it before, but according to the machine shop i go to, they CAN get damaged

 

Just get some .25mm or .5mm overbore RS Machine ITR Copies.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ruffrhyder &raquo;</TD></TR><TR><TD CLASS="quote">Just get some .25mm or .5mm overbore RS Machine ITR Copies. </TD></TR></TABLE>

why?
it don't sound like it's a crazy build, just a little bit more pep into it.

I would get new ones, myself.

 

[QUOTE=jime64871]

why?
it don't sound like it's a crazy build, just a little bit more pep into it.

I would get new ones, myself.[/QUOTE]

You would get new what? New rings or new pistons? If you plan on getting new pistons and rings, what's wrong with my suggestion of using RS machine pistons? It would be a good idea to go overbore to ensure the cylinder walls aren't tapered or out of round. What were you suggesting?

 

Get new pistons. Trying to re-use old pistons is not the wisest of moves.

 

I've got that omniman 200 hp b16 dvd and he's all about using the stock pistons. Thats the only reason I'm wondering if I should reuse them after seeing his results.

 

in omni mans video i believe they put brand new pistons in it. or atleast i hope so since he was shooting one of them with a BB gun.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ruffrhyder &raquo;</TD></TR><TR><TD CLASS="quote">[QUOTE=jime64871]

why?
it don't sound like it's a crazy build, just a little bit more pep into it.

I would get new ones, myself.[/QUOTE]

You would get new what? New rings or new pistons? If you plan on getting new pistons and rings, what's wrong with my suggestion of using RS machine pistons? It would be a good idea to go overbore to ensure the cylinder walls aren't tapered or out of round. What were you suggesting?</TD></TR></TABLE>

New P30 pistons...
I don't think he's doing a crazy build from the limited info. Going oversized would mean a little more work. It's that's not the case, then there are many pistons out there to choose from..

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cmerce &raquo;</TD></TR><TR><TD CLASS="quote">I've got that omniman 200 hp b16 dvd and he's all about using the stock pistons. Thats the only reason I'm wondering if I should reuse them after seeing his results.</TD></TR></TABLE>

So do i, he used new ones...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jime64871 &raquo;</TD></TR><TR><TD CLASS="quote">

New P30 pistons...
I don't think he's doing a crazy build from the limited info. Going oversized would mean a little more work. It's that's not the case, then there are many pistons out there to choose from..

So do i, he used new ones... </TD></TR></TABLE>

How do .25 or .5mm oversized RS machine ITR pistons make for a "crazy build" Overboring cost like another $30-50 bucks on top of a hone, which should be done in any build. And like I said previously, going overbore at least .25mm is a great way to ensure the cylinders are true and not tapered or out of round. You're acting like the RS ITR pistons are forged or something and cost a grip of cash.
Are you refering to OEM P30's, cause if so, those pistons in a gsr motor will already be above 11.5 CR which is what the OP is aiming for. And with even just resurfacing and decking the block, CR can easily shoot up to 11.7 or 11.8:1. Not to mention the fact that OEM P30's alone would cost about $180, why pay that much when the RS pistons are only $160 and come with rings.

 

Dude your over reacting!!!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cmerce &raquo;</TD></TR><TR><TD CLASS="quote">...I'm planning on doing a complete oem part rebuild to the gsr...</TD></TR></TABLE>

Going oversize means more work! He's looking for a "oem part rebuild." P30's are perfect for what C/R he's aiming @. JDM ITR's won't get him there (11.1:1).
Your over examining the original idea of his build and getting carried away from it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jime64871 &raquo;</TD></TR><TR><TD CLASS="quote">Dude your over reacting!!!

Going oversize means more work! He's looking for a "oem part rebuild." P30's are perfect for what C/R he's aiming @. JDM ITR's won't get him there (11.1:1).
Your over examining the original idea of his build and getting carried away from it.
</TD></TR></TABLE>

I'm just not a fan of the P30 dome. I'd much rather run the RS ITR USDM copy pistons which have less dome, get 11.3 CR and have more room for tuning, than run a high dome P30 with a higher CR and less room for error when it comes to the tune.
And how is having the block bored over any more work for the OP if he is already gonna have the block honed. Assuming he does have it honed, which should be done in any rebuild.
Why run OEM pistons when the RS pistons are lighter, better designed and cheaper?

 

ask him those question. I'm just keeping the op originals perspectives in mind.
You have valid info. and do acknowledge that.

 

I know I could step it up to jdm type r slugs for an extra $200, but i'm just trying to save the money for this build. Right now it's a b16a2 with s2s2 cams, ti retainers, springs, p & p, 3 angle valve job, , type-r lsd, and a 6-puck. Now I'm doing a gsr block to finish it off. I figured an all oem rebuild would be good for this set-up because the b16 pistons would give me the compression ratio I'm looking for and I already have them which is a plus. I just don't know what types of problems I might run into with reusing the pistons. With new rings, they should be good as new with sealing the cylinder pressure. Would I have to worry about them being worn out in any other way besides rings?

 

You'll need new wrist pins and new rings. Take the block to the machine shop and have them make sure it isn't tapered or out of round beyond the limit. If so, you'll need to overbore. No matter what, you should have the block honed at the very least. I would also recommend some ARP rod bolts and have the bottom end balanced.

 

Yet another thread where the OP had his mind made up before the first post. Regardless of good information, he is going to go try and press out the wrist pins in his b16 pistons. GL, most of the time you get 3 good pistons and one crushed one.

 

So I just went to a machine shop and they said that the pistons do get damaged sometimes when removing the old wrist pins. So instead of spending $50 for something that might not work out, I'll put it towards the new pistons. Thanks for the good information guys it's whats helping me make up my mind. So how do the rs machine pistons compare to jdm r pistons for quality, I heard jime say RS pistons are lighter, better designed and cheaper?

 

RS Machine pistons are very nice for the price and are a bit better than the OEM castings, but keep in mind they are CAST, just like the OEM slugs, if you want to make power (boost or nitrous or very high revs) go with a forged slug to take the abuse.

EDIT: wow just realized this thread is ancient!!!! ooops!

I just found out that my GSR motor in my hatch has P30 pistons in it and was searching around for an idea on compression ratios...

 

so u could use stock rods with rs machine pistons or u need aftermarket brand ?

 

rs machines are the same as oem pistons just made in china lol but still the same thing

 

They (RS Machine) use stock rods or aftermarket

 

well if rs machine and oem pistons are basically the same and oem pistons use oem rods then use the same with rs machine pistons yes use oem rods rs machine is a stock style piston its nothing special you dont need aftermarket rods for stock pistons

 

where can i get get some RC pistons. i was also thinking about going with p30 pistons in my ITR motor and bore it out .25. what would you guys recommed me going with p30 or RC pistons. my goal is to reach aroud 190 whp all motor.

 

this just means you need a better tuner...