pistons

so i have a 7 bolt engine, pistons are listed for 93-94, or 95-99, whats the easiest way to tell if its a 93-4 or 95+ bottom end?

all 95-99 are 7 bolt.

well he was asking how to tell the difference between a 1993-1994 engine to a 1995+ engine

..but he asked about the bottom end.

i interpeted his question as he knows its a 7 bolt, but wants to know if its a 1g or a 2g 7 bolt. I think is that the 1g's had a smaller compression ratio than the 2g version. But other than that, i dont know any way of knowing which year it is

let me help everybody out - racerx55, what exactly is your question? are you looking to know which pistons to buy? or are you asking which bottom end is which and how can you tell the difference? because a 7 bolt is a 7 bolt, don't matter if it's from a 93 or a 99

i want to know what pistons to buy, its a 7 bolt, i was assuming its a 93-94 because of the 1g head, but by the looks of this engine its a n/a motor with a turbo head,paperwork on the car shows a 95 engine being put in, so it could be a 1g head on a 2g bottom correct?
i dont trust a paper to tell me what it is so, what i want to know, is by looking at the bottom end how do you tell weather its a 1g or 2g (7 bolt of course)
thanks for anyones help

as far as i know. a 7 bolt is a 7 bolt. doesn't matter if it comes off a 93 or 99. now i never thought about this until now but... i'm not sure if there is any issues with taking a 7 bolt from a NA 1g eclipse and putting a 2g head onto it...

i think the block itself it pretty much identical. I dont know of any #'s or anything that would clue you in, all i know is that the compression ratio on a 95+ should be like 8.5:1 where the 1g's where 7.8:1.

quote:

ORIGINAL: RCJr9186

as far as i know. a 7 bolt is a 7 bolt. doesn't matter if it comes off a 93 or 99.

well when pricing pistons for a 7 bolt, its lists 1g 93-94, then 2g 95-99, theyre priced different so somethings gotta be different about them, maybe the difference in CR is all its is..

quote:

ORIGINAL: TheEngineer
the compression ratio on a 95+ should be like 8.5:1 where the 1g's where 7.8:1.

Yup.
The 1Gs have lower compression and longer rods (I know, not what you're asking). So the pistons will definitely be different between the two 1G and 2G motors. I'll look around a bit too to help clarify.

longer rods are things i do like to know, with things like that i just need a rod length then ill be able to measure & know what i have,longer rods are always better anyway, i wish i had a 6 bolt just because i know the bottom ends are indestructable in them.
i'm up for any kind of info on all the different engines i can get, i love knowing alot about anything, no information is useless to me, ive been trying to find a specs list on all the internals of them but havent came across much yet, a friend gave me a haynes manual & those usually tell me evrything i already know & whatever i want to know it always says it should be done by a trained professional, or "see section 6", you go to secton 6 for that certain thing, and it tells you go go back to where you just came from, and nowhere in the book does it tell you **** about anything you were looking for
those books are good for nothing but torque specs for bolts....
anyway when i do figure out what i have i'm gonna get new pistons, have the rods resized IF it can be done, i know a 420a has the caps broken off and they cant be machined & resized for cheaper than buying new. if anyone has a stock 14b turbo floating around for cheap im sure ill be interested, its better than a 16g with the blades melted off, it has little nubs left on it and the housing is cracked across the wastegate

thanks silvercoupe97, with your help found out its a 6 bolt motor

Glad to help
So, you either have the pre 7bolt like the 1GB or a previous owner swapped in a 6 bolt. Someone probably just ran that motor to hell, never turbo timed it, and probably just cranked up the boost without supporting mods or just ran it to the ground all day, every day without TLC.

its a 5-93 car, must be a 6 bolt swap, but i honestly belive it was a n/a bottom end because the pistons are flat tops, not dish, that will cook it real quick, especially with a 16g turbo on it, there is no sign of a cut hose for a boost controller, but that doesnt mean anything, it has a turbo timer,i think that was just recently put on

well at least thats some good news for you that its a 6-bolt

I'm having a hard time finding any other info for you bro. I did find a set of 2g type pistons..you're correct about them being dished/bowled/not flat, lol.
http://www.store.partsdinosaur.com/product92.html



Damn, right guy, wrong thread, lol.

dont matter, you can just talk about it in any of these threads and it will work since his discussion is in all of them, haha

Well then, lol.

Here's some 1G non-turbo pistons.


Kind of hard to tell, but they are concave too.

i think the "T" on the number is a giveaway for Turbo, mine say 67D on the top, and look just like thos non turbo's in the pic, i'm gonna try to stick to one thread now, i get sidetracked too easy & start rattlin **** off about my car then the whole thread changes subject
actually the ones in your pic have more of a dish than mine do,


Thumbnail Image

alright well let me just say this, there is know way that you have N/T pistons in that car, because the car would not even run correctly and it would get destroyed, and i know that your engine is already, but not for that reason. The CR for NT pistons are way to high, and someone would have to be a dumbass to put that in there. So my guess is that they are just cheap pistons. I say call up a dealer and tell them the code on top of the pistons and see what they come up with

it dont much matter, the cylinders and crank are still good, so that leaves me with the option to do anything i want with it, any suggestions? forged pistons are out of the question i dont wanna dump $500 in pistons in it

As long as you're not looking to make balls out power and stay close to proven stock capabilities, I say find some 2G pistons and 1G big rods, or just use your rods (if they're still any good). You'll still need to get new rings and you'll also have to machine the wrist pin to fit the bigger 2g piston rod. I don't see that costing you more since you do machining too.

whats the deal with using 2g pistons?

I was just looking for info for you regarding that, lol.
http://www.dsm.org/archives/1999/10/19991014.txt/21.html
Starts in the 3rd paragraph down.

Awesome timing, lol.