Evo 8 piston rod combo

[staztrx250]

I've been looking into running evo 8 pistons and rods in my 95 7 bolt and i've been getting a lot of conflicting information. From what i read they work great in the 2g block as is how ever i get conflicting info on these thing:

1. piston orientation: Some say flip them some say run them normal as far as the arrows. Which one is it?

2. Compression ratio what is it. People say its lower than stock because the the piston is short. But the wrist pin is further down the piston.

3. can you use 2g rod bearings with the evo 8 rods


I would appreciate the input the information i have been finding is sketchy at best!

 

[hurricanecris24]

is there a reason you want to do this? just cause? i mean you might has well get forged internals and stock 2g pisons and 1g rods have been proven to handle power

 

[staztrx250]

is there a reason you want to do this? just cause? i mean you might has well get forged internals and stock 2g pisons and 1g rods have been proven to handle power

I'm building a block to get me through the summer so i just want to try something different. B4 i build a monster motor next year

from what i found so far

They are Teflon coated (similarly to wisco) and have a partially forged piston. they can hold down 600 hp.
The compression ratio that i keep finding is 8.8:1 in the 2g block i'm just looking on some hard evidence on that.

I'm just thinking it would be a good upgrade because i have to do a rebuild on the lower end anyway and i could get a set for cheap.

 

[gsxeclipse97]

Short answer, yes they work, yes they are forged, and they are 8.8:1 compression, I have never heard anything about them being coated though. and making the power they make is a combination of many engine improvements, not just those few parts.

 

[prostreetdsmx1]

the rod bearings for the 7 Bolt DSM and EVO are the same so those are interchangeable. Most people do flip the piston and it's a bit lower compression in the DSM. IT's a solid setup to run if you don't have the budget for forged pistons but to be honest, Mahle, Manley and Wiseco all make awesome pistons that are under $500 and when you look at the long term benefits, they are typically enough to really take that extra leap. It's been my experience that when someone is building for a true 600hp setup, they tend to build to dance that line and I'd rather spend another few hundred bucks for piece of mind... just my $.02, though.

Hope that helps.

Marti

 

[shredwin]

Im running the evo/rod combo in my 95gsx... I used the evo rod bearings but you can use the 2g rod bearings as well. here is a thread i started and gixrman is also running the evo pistons and rods.
http://www.dsmtuners.com/forums/newbie-forum/311850-any-2gs-evo-pistons.html
http://www.dsmtuners.com/forums/newbie-thread-graveyard/244184-can-anyone-help-me.html

 

[drewboi]

i just got some evo 9 rods and pistons off curt brown.. just came in today.. im hanging mine on some 6 bolt rods... the pistons have a 1mm wrist pin offset ... and the offset has to be on the exhaust side if that makes sense.. witch requires the 2 dots to be facing the front of the engine, the valve reliefs will be backwards...

 

[staztrx250]

i just got some evo 9 rods and pistons off curt brown.. just came in today.. im hanging mine on some 6 bolt rods... the pistons have a 1mm wrist pin offset ... and the offset has to be on the exhaust side if that makes sense.. witch requires the 2 dots to be facing the front of the engine, the valve reliefs will be backwards...

That's what i thought. So what does this mean in terms of possible valve interference? and what if i run a bigger cam like a crower(not bc) 272?

the rod bearings for the 7 Bolt DSM and EVO are the same so those are interchangeable. Most people do flip the piston and it's a bit lower compression in the DSM. IT's a solid setup to run if you don't have the budget for forged pistons but to be honest, Mahle, Manley and Wiseco all make awesome pistons that are under $500 and when you look at the long term benefits, they are typically enough to really take that extra leap. It's been my experience that when someone is building for a true 600hp setup, they tend to build to dance that line and I'd rather spend another few hundred bucks for piece of mind... just my $.02, though.

Hope that helps.

Marti

yeah i know but i don't have the money to build my dream motor yet. When i do though it will be an all out 500-600hp motor

 

[Redwidow]

IIRC Evo 8 pistons are cast. The Evo 9s are forged and the tops are coated

 

[tEi Vp DsM]

just do what S&R said,just put a few bucks together and get a set of good pistons.sell the pistons you have and get the others.there is really no point in doing 2g piston and 1g rod combos or evo piston dsm rod combos.those are the ways to go if you are just absolutley broke and cant go any other way.if you are going to spend hard working time to rip the motor apart just to do that,then its now just a waste of time.do it the right way and be done with it......good luck

also dont waste your money on bc cams(garbage)...go either with gsc or kelford,hks is also good...i prefer the kelfords,they make great power and cheaper than hks...bc are cheap and you GET WHAT YOU PAY FOR!!!

 

[jrohner]

The evo has a smaller combustion chamber head, so when you put their pistons in a dsm the compression goes down (8.3-8.4 probably). Tthe wristpin is offset to take some stress off the rod -- reversing this adds stress instead, so don't put them in backwards.

Evo pistons are nice, but I'd take 1g rods over evo rods any day.

 

[staztrx250]

Im running the evo/rod combo in my 95gsx... I used the evo rod bearings but you can use the 2g rod bearings as well. here is a thread i started and gixrman is also running the evo pistons and rods.
http://www.dsmtuners.com/forums/newbie-forum/311850-any-2gs-evo-pistons.html
http://www.dsmtuners.com/forums/newbie-thread-graveyard/244184-can-anyone-help-me.html

so getting thought the layers and layers of going back and forth what is the final word on piston orientation. And did you run evo 8 rods as well?

 

[nightmares GS-T]

just do what S&R said,just put a few bucks together and get a set of good pistons.sell the pistons you have and get the others.there is really no point in doing 2g piston and 1g rod combos or evo piston dsm rod combos.those are the ways to go if you are just absolutley broke and cant go any other way.if you are going to spend hard working time to rip the motor apart just to do that,then its now just a waste of time.do it the right way and be done with it......good luck

also dont waste your money on bc cams(garbage)...go either with gsc or kelford,hks is also good...i prefer the kelfords,they make great power and cheaper than hks...bc are cheap and you GET WHAT YOU PAY FOR!!!

He clearly stated that he was looking at CROWER not bc.

 

[staztrx250]

also dont waste your money on bc cams(garbage)...go either with gsc or kelford,hks is also good...i prefer the kelfords,they make great power and cheaper than hks...bc are cheap and you GET WHAT YOU PAY FOR!!!

I said NOT brain crower!!!! crower cams... just crower. There is a huge difference!

and does nobody read that this motor only has to last the summer. Then yes i will be building a motor from the ground up the right way.

 

[shredwin]

so getting thought the layers and layers of going back and forth what is the final word on piston orientation. And did you run evo 8 rods as well?

I believe my pistons and rods came off an evo 9, and I have the dots facing towards the timing belt side.

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[drewboi]

That's what i thought. So what does this mean in terms of possible valve interference? and what if i run a bigger cam like a crower(not bc) 272?

im not sure , shredwin.. what kind of cams you running

 

[Army4g63]

Why would you do it twice is the question? Like everyone else is saying, save your pennies and do a manley/wiseco build man. Better than tearing it apart, putting it back, tearing it apart, putting it back again. Or, maybe i'm just lazy..

 

[shredwin]

im not sure , shredwin.. what kind of cams you running

stock cams

 

[codeofdastreets]

Just curious, how many people did 6 bolt crank and rods wit evo 8 or 9 pistons?? And if so ,is it recommended??

 

[staztrx250]

Why would you do it twice is the question? Like everyone else is saying, save your pennies and do a manley/wiseco build man. Better than tearing it apart, putting it back, tearing it apart, putting it back again. Or, maybe i'm just lazy..

Yeah you make sense but i left out a couple facts. I have to put new bearing in the lower end because my crank is just out of spec. The motor is already out of the car because the stock clutch disc blew up. I'm for sure not using this block when i do my monster build and the head is only a maybe. My compression is a little low in one cylinder so i have to re-ring the pistons and hone the cylinders any way. I have the possibility of getting brand new evo 8 pistons and rods for 175 bucks. Which include brand new rings. I'm on a college budget so we're looking at a total rebuild budget of about $700 tops. And i'm already in it $336 for a clutch gaskets a new bov and a throw out bearing. and tht 700 was supposed to include 350 bucks fro those crower 272s. I still need main and rod bearings arp head studs and a head gasket and piston rings.

So lets try this what would you do? keeping in mind we are building a motor to survive the summer