Probe Forged Pistons: You want 'em? GB!

[Cya]

will higher compression give more torque? (i assume yes) so im thinking 8.8:1 compression (just to get the ball rolling). I like the piston ring sizes but main concern is the compression since im planing on shooting meth.

 

[starscream5000]

Here's some info I found on the following pistons from their respective websites. Problem is, they don't release the info on their G-damn skirt lengths:

JE

Part #--- Bore--- Oversize-------- ---CC's ---C/R With .040 Dome--- CC's--- Gram--- Footnote ---Skirt

186241--- 83.50 ---+.020------------- 40.0--- ---8.8:1--- --------16.1--- ---296--- ---T ------R

186242--- 84.00--- +.040------------ 40.0---------8.9:1--------- -16.1------ 301----- T -----R

Wiseco

Bore-----O/S-----Comp.-----Gram
83.00----Std.-----9.0-------317
83.50---+.020----9.0--------322
84.00---+.040----9.0-------327

Ross

Bore---CR-----Gram-----Dome
83.4---8.5----357---- __-19.3
83.1---8.5----357----___-19.3

Arias

Bore-------------- Comp.----- Dome---- CompressionRatioComp.--- Gram
3.287 / 83.50 -----1.299----_ -17__------------8.9--------------- 300
3.307 / 84.00----- 1.299---__ -17__------------ 9 ----------------312

 

[starscream5000]

Sounds like you want something close to a Wiseco piston John

 

[Doward]

A Wiseco with less compression *would* be very nice...

The thing is, I want this to be a COMMUNITY effort - I'd like to get information from all of the main players - people that have played with the other forged pistons. There is ZERO reason, since we can have these made any way we want for $292.50/set, to have a piston that doesn't address any issues anyone can think of!

I, for one, am not cool with the short skirt of the JEs, for example.

 

[starscream5000]

Exactly! I want my cylinder walls to last, and I don't car about having a light piston to rev this engine to the moon. I want a heavier, reliable piston that won't wear on the engine and can take some detonation and keep going.

 

[screaminglemon]

1) Doward
2) S turbo 87
3) zachm611
4) TobyCat
5) mark3monster
6)MassSupra89
7)Born2drv
8)90T04
9)woodytsi
10)bmoss85
11)LilMissMkIII - pending shipping price to Aus
12)screaminglemon

im in, as long as you are not asking for the money right away. way too many great group buys lately.:aigo:

so they will be recomending 3 thou clearance for these? that seems kind of tight but would be awesome if true. thats even tighter than the CP pistons. from what i got from another thread:
Ross 0.006
JE 0.004
CP 0.0035
Probe 0.003

 

[IJ.]

Ross at 6 will rattle when cold

Also if you have coatings applied you'll need to drop it a thou or so for the same reason (coatings prevent the piston expanding as much so rattle)

 

[suprarich]

IJ - we call it slap

 

[IJ.]

Slap/Rattle all much of a muchness

Good thing NOT to have unless diesels make you smile.

 

[TobyCat]

Cold start slap doesn't sound too sweet, especially here in Canadia
I would also prefer a long skirt like the Wiseco pistons, and a close to stock compression. Then again, I don't have much clue on the effects that each parameter has on an engine. Maybe some of the more experienced guys could pipe in and share their...epxerience

 

[Doward]

Toby, that's what we're looking for, more experience!

I'm going to run 4 thou on these pistons, most likely - I don't want to sieze one because I got lean and expanded the piston

Ian, what thoughts do you have, on an optimal piston?

 

[IJ.]

Dow: If you're building these for the majority of the guys long skirts and stock thickness rings would be a step in the right direction, the after market covers the high end race type parts nicely but for DD mid hp cars there's stock or ummm stock....

 

[TobyCat]

That's true IJ. These pistons would mainly be for those not looking for crazy HP but want something that'll hold up against higher boost levels.

 

[IJ.]

TC: It's the 2 things I don't like about my JE's

 

[suprarich]

IJ - there are two things I don't like about JE's also

1- they cost a lot
2- they cost a lot

 

[IJ.]

I figure with the amount of $$$ in my motor the JE's are a very small % but would have preferred thicker rings and maybe a little longer skirt as I tend to pile up the KM's when it's actually running.

 

[Doward]

The longer skirts is a definite plus in my book - why the thicker rings, though? I would think a slightly thinner ring than stock would help remove some friction... Let's discuss some of these parameters!

The Wisecos are 317 grams, stock sized - I'd like to aim for about 325 ish - how does that sound, compared to stock?

 

[suprarich]

A thicker ring set will yeild longevity for the ring. IE, more surface to wear on the ring. A sharp pencil dulls quickly.

 

[jdub]

I'd go for the thicker rings myself

 

[born2drv]

I'd prefer a lighter piston, aprox 290-300g, similar to the CP's or JE's.....

Weight:
Stock pistons.... 366g
JE................... ~293g depending on bore
Ross................ 357 Grams
Arias(??).......... 310 Grams
CP ...................301 Grams @ 84mm bore.