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Just wanted to get some opinions on a set of JE Pistons I keep seeing for sale all over this site, a few others, and Ebay. JE part #245188 Listed as Yates "Nascar" Pistons. Prices for a used nice looking set are low, which of course leads me to believe they are not good for street use and thus that is why they have no value. I was thinking of popping a set into my Lq4 forced induction build, intended for street use as a good forged piston substitute for the expensive stuff. I haven't ruled out a couple of other offerings but if I can save $$ and have a decent part I will be happy.
With a 6.125 Rod in my LQ4 with LS9 gaskets and L92 heads the summit racing compression ratio calculator puts my CR is right around 10:5:1 a little high for a boosted build but I plan to temper it with E85 anyway, or quality 93 octane from time to time when E85 isn't accessible.
Valve reliefs will be goofy since canted valve heads.
.923” is an odd ball wrist pin. Which by the time you re bush small ends of rods or hone the pistons out .004” and purchase pins. They’re just no longer a deal
You lost me... yes, they are listed as LS2 Nascar Spec. What does this mean? I think I am going to call JE in the morning and see if I can get any info on them
The Nascar LS2 spec engines use LS2 heads (243/799 castings) these are GM stock heads that are ported. The valve size is limited to stock valve size. Wegner developed the initial engines. I don't think the spec motors have canted valves - because a LS2 (243/799) head casting is used.
Spoke to them over at JE. I think I am going to either pull the trigger on a more expensive set or leave the block stock. This would be a great piston for a high revving ls2... but the tops are very thin and supposedly its not a good choice for forced induction.
Spoke to them over at JE. I think I am going to either pull the trigger on a more expensive set or leave the block stock. This would be a great piston for a high revving ls2... but the tops are very thin and supposedly its not a good choice for forced induction.
Thanks,
DG
Yeah.....good call !!!!! stock car **** is ultra light to enhance rev-ability
Even those I've seen split in the center from ragged edge tunes and continuous detonation
Danspeed, regarding the used JE Pistons - choose to pass on them when I got a used Nascar spec motor LS2 block and heads. They would probably be OK NA but FI - I would get new pistons tailored for your project.
Sounds like those pistons are like some of us; don't do well under lots of pressure! lol
I laughed
Originally Posted by 99 Black Bird T/A
Danspeed, regarding the used JE Pistons - choose to pass on them when I got a used Nascar spec motor LS2 block and heads. They would probably be OK NA but FI - I would get new pistons tailored for your project.
Just my .02
I agree with you, I don't need them shattering like glass. Just looking at the weight alone I should have figured they wouldn't be great for FI
I have a set of the spec pistons in the shop.. they aren't real light, which makes me think the top cant be too thin. I'm putting them in a engine with square port heads, and 57cc chambers.. and will be spraying 250hp at least..time will tell how they do (I have a cam from the spec engine as well).
I bought a set of these pistons for my first turbo build on an LS. An LQ4 with twins. I eventually broke a turbine shaft in one of my S467 turbos after about a year and threw a set of ON3 78/75s on it. These pistons are not doing what I expected. They won’t die. I have almost two years of street driving with a season at the track on between 30 and 40psi. I also don’t turn the boost down on the street.
I hate hearings stuff like that because it makes me what to give them a shot anyway even though logic states I shouldn't lol. I got a deal on a set of K1 H-beam rods btw. Still scouring for a killer price on pistons. In no rush though, working on too many other projects all at the same time.
12-03-2017, 11:07 AM
JE "Nascar" Pistons, looking for Info 
