I remember hearing about this months ago, and I was wondering if anyone heard anything about this.. supposedly along the same lines as those Topline or Nippon pistons.. except they are ITR with 84mm bore.

Anyone?

 

i belive spark racing carries something like that but they are on super back order from what i understand........

 

anyone else have info on this?

 

hmmm, imma have to look into this one..

 

One question...why???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MaxBoost &raquo;</TD></TR><TR><TD CLASS="quote">One question...why??? </TD></TR></TABLE>A cheap way to raise compression, and maybe even have deeper valve reliefs so you wouldnt have to cut them like on the b20z pistons i believe.

 

not look into it for me, but to see if this is true. That ok?

 

i don't feel like going with forged pistons.
i'm building a mild non-VTEC B20 swap for my car(stock cams, etc), and these pistons would be perfect for me.
looking to build a 100k+ mile motor. not saying that it can't be done with forged, but cast pistons have never done me wrong.

oh, and yet another reason i want cast is the fact that i won't have to go to the machine shop. with forged, even at stock bore, you need the holes slightly oversized to compensate for the expansion of forged pistons.



Modified by Mike K at 8:18 PM 7/21/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MaxBoost &raquo;</TD></TR><TR><TD CLASS="quote">One question...why??? </TD></TR></TABLE>

Some of us are running setups that don't require the strength of forged pistons. And strength is the only advantage of forged pistons over cast pistons. In every other way, cast pistons are better.

 

those pistons are a being made for RS they will be part of the new RS spec line! They will be a 84.5 11.8:1 ultimate street pistons giving up to 5 more hp over forge components

 

Ant idea when these will be available?

 

heard that. when will they be available and also will they come in 84.0mm bore?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Spark Racing Inc. &raquo;</TD></TR><TR><TD CLASS="quote">those pistons are a being made for RS they will be part of the new RS spec line! They will be a 84.5 11.8:1 ultimate street pistons giving up to 5 more hp over forge components </TD></TR></TABLE>

Question:

How will these cast pistons give you up to 5 more hp over forged forged pistons?

 

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

How will these cast pistons give you up to 5 more hp over forged forged pistons? </TD></TR></TABLE>

hp starts at the ring seal of the piston, and compression and all the rest depends on the dome of the piston.

therefore, a forged piston and a cast piston with equal dome profile and ring set should in theory make the same hp, with the forged piston having the edge because it would run cooler.

unless there's somethin i don't know someone else pls chime in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike K &raquo;</TD></TR><TR><TD CLASS="quote">i don't feel like going with forged pistons.
i'm building a mild non-VTEC B20 swap for my car(stock cams, etc), and these pistons would be perfect for me.
looking to build a 100k+ mile motor. not saying that it can't be done with forged, but cast pistons have never done me wrong.

oh, and yet another reason i want cast is the fact that i won't have to go to the machine shop. with forged, even at stock bore, you need the holes slightly oversized to compensate for the expansion of forged pistons.

Modified by Mike K at 8:18 PM 7/21/2005</TD></TR></TABLE>

i heard cp pistons are pretty damn good
and they will also run cooler, but i see your points.
s2000 stock piston is forged.. haven't heard of any problems with those yet. maybe it's how well the piston is manufactured? ::

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVOL &raquo;</TD></TR><TR><TD CLASS="quote">s2000 stock piston is forged.. haven't heard of any problems with those yet. maybe it's how well the piston is manufactured? ::</TD></TR></TABLE>

I have never heard that this is true. But if they are forged, then the stock pistons are probably high silicon pistons. High silicon forged pistons have thermal expansion coefficients similar to cast pistons. But they aren't as strong as conventional, low silicon forged pistons. However, they are still stronger than cast pistons. Just keep in mind that high silicon aftermarket pistons are generally not available.

 

Why not used the stock ones and modified it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike K &raquo;</TD></TR><TR><TD CLASS="quote">I remember hearing about this months ago, and I was wondering if anyone heard anything about this.. supposedly along the same lines as those Topline or Nippon pistons.. except they are ITR with 84mm bore.

Anyone? </TD></TR></TABLE>

I'm also looking for a set of these. Any idea on when RS will have these to market?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StorminMatt &raquo;</TD></TR><TR><TD CLASS="quote">
Just keep in mind that high silicon aftermarket pistons are generally not available.</TD></TR></TABLE>

SRP's are high silicon pistons.

 

Supertech?

 

bump, user thevanitygroup was selling these before but seems hes out of them.

 

I read about this like a year ago some shop in AZ was asking people if they would want to buy them if they made them.. sounds cool to me..

 

as stated, SRP (by JE) are high silicon forgings, as are Endyn's NA slugs from Wiseco.

regarding the idea that a cooler-running piston, otherwise equal to one running hotter, will make more power; that's false. as long as the piston can handle the heat, which doesn't cause pre-ignition, the hotter, the better. (of course, this must account for proper piston-to-wall clearance, and generally, the tighter with which you can safely run, the better, since you'll have better ring seal, longer ring life, and a more round bore.) the same goes for the combustion chamber as a whole. run 2 = heads, one iron and one Al; the iron head will make more power since it retains more heat.

 

ok so anyone know of anyone selling 84mm pistons with some sort of a dome to em that arent forged?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slofu &raquo;</TD></TR><TR><TD CLASS="quote">as stated, SRP (by JE) are high silicon forgings, as are Endyn's NA slugs from Wiseco.

regarding the idea that a cooler-running piston, otherwise equal to one running hotter, will make more power; that's false. as long as the piston can handle the heat, which doesn't cause pre-ignition, the hotter, the better. (of course, this must account for proper piston-to-wall clearance, and generally, the tighter with which you can safely run, the better, since you'll have better ring seal, longer ring life, and a more round bore.) the same goes for the combustion chamber as a whole. run 2 = heads, one iron and one Al; the iron head will make more power since it retains more heat. </TD></TR></TABLE>

Please explain to me how a hotter piston, or hotter iron head makes more power.