Lawnboy

iTrader: (54)

I just bought a set of new in the box JE -20cc dish boost pistons .

OK i have a few questions.
They use a 945 pin, not the typical 927 aftermarket pin, can i get a strong 945 pin?

also they are for the stock 6.98 rods, but i heard i can use a 6.1 aftermarket, and that is what i realy want to do.

they are for a 4" LS2 bore , i think they need a 3 0r 5 thousands hone.

and my friend cced them, i think he said they came up 20cc .
Using a 243 casting head, not sure the exact combustion chamber size, i think around 64 cc's , the compression will be 9.0

is this right? i realy didnt want anything under 9.0 to one compression

Thank you for your help

camarols1

iTrader: (17)

I would call JE direct with the part number on the box.
They will verify the piston specs and intended usage and save you lots of time.
The pistons and pins are usually matched up by the piston manufacturer because not every piston uses the same length pin.
JE built mine with a little shorter pin length and heavier wall to reduce flex.
I think you meant 6.098 rod length, not 6.98 btw.
Also, a larger diameter .945 pin will be stonger than a .927 pin given the wall thickness and material are the same.
The rod length is dictated by the deck height, stroke, and piston pin location, so if they were built around a 6.098 rod, that is what you will need.
Good luck!

Jim

Sales2@Texas-speed

iTrader: (5)

If there's a part number, we can do a quick look-up and get all the info you need. Did the pistons come with the pins? Stock is 6.098" on the rods, so a 6.100" would just move the piston an additional .002" out of the hole (or less in the hole depending on the deck height and all). That's not going to be a major problem in most instances.

More info on that piston would help to ensure everything jives together on the combo!

Lawnboy

iTrader: (54)

Yeah sorry about that , i ment 6.098 , no i the pins didnt come with the pistons, i heard that i need standard length pins and that a 6.1 rod will work fine with the stock LS2 crank and block.

In my LS6 block i am running a callies 3.625 dragonslayer, the stock crank is only a 3.622 so that a .003 difference out of the hole, i should be fine.

what you guys have on sale as far as pins, rings and rods? for my JE's

Sales2@Texas-speed

iTrader: (5)

The difference in stroke is actually cut in half when you consider how far it'll push the piston out of the hole. I'd really have to have a piston part number to get exact specs and see what pin it needs since there's more to it than just the diameter.

Lawnboy

iTrader: (54)

ok ill get the part # tomorrow, but are u saying the .002 longer rod length will come out of the hole more over a .003 longer crank stroke?

Sales2@Texas-speed

iTrader: (5)

Right....here's the formula to figure out where your pistons end up in relation to your deck height.

(Stroke/2)+Rod Length+Piston Compression Distance

So say your pistons have a CD of 1.331" and are meant for the stock crank and a stock length rod...here's how it would work out with YOUR crank and a 6.100" rod.

(3.625"/2)+6.100"+1.331" = 9.2435"

So if you haven't milled the deck surface any on that LS1, and it's still 9.24" then your piston will be out of the hole .0035"....which isn't alot or out of the ordinary.

Lawnboy

iTrader: (54)

OK , you know your math very well.. And i like Texas speed i bought your Double chrome LS1 spring kit for my LS6, nice kit by the way.

OK its a new LS2 never decked, machined etc, or will be i hope.

the pistons i will find out tomorrow part #'s

OK with 6.1 Scatt, callies or eagle, H beams , (not sure what i am going with) depends on deal/price

In this motor build i will be using the stock crank, (3.622 stroke) so with the stock 3.622 stroke what will the out of the hole # = than?

but it was good to know that if i used another aftermarket crank like the callies where the stroke is slightly longer 3.625 that these pistons & a 6.1 aftermarket rod will still will still work

TTYS

Lawnboy

iTrader: (54)

O yeah 1 other thing what is the max the piston can come out of the hole?

Lawnboy

iTrader: (54)

OK the part # for the dished JE piston i have is 230472


Ill PM Matt at TSP also the part #

i just got a chance lastnight to go get the sheet with the part # on it

Sales2@Texas-speed

iTrader: (5)

I got with JE since I couldn't find anything on that part number and they said it is a custom piston. They need a job number (six digits all numbers) to pull the exact specs on the piston so we can get you the info you are wanting.

Lawnboy

iTrader: (54)

ok i dont see a job # on that paper that was in the box
but i see this : Cam FAS Forging 915F2 Profile 6928

not sure if this will help

where do i find a job # ?

Sales2@Texas-speed

iTrader: (5)

He said it should be on the piston spec card as well as laser etched into the pistons.

Lawnboy

iTrader: (54)

ok i have to look for that later

Lawnboy

iTrader: (54)

Ok got it! Job # is : 450220

I dont have a spec card for some reason, can i get one?

This # was on the side of the box and on the piston
thank you for your help

Lawnboy

iTrader: (54)

Hello Matt any luck finding out about those JE Pistons i have? please let me know