Evo 8 pistons on 6 bolt block

[RedTsi_PR]

I know the pistons fit on the 1g rods using the same method as putting a 2g pistons but my concern is the evo 8 piston has the pin a little up compared to the 1g pistons.Does the evo 8 pistons are gonna sit lower on the 1g block?

Anyone who can share a little knowledge on this? I only need to know if the piston sits lower than the OEM ones

 

[iceman21221]

Im also interested in this as i have a set of eagle 6 bolt rods that i also would like to fit on evo 8-9 pistons.

Any one have any info on this?

 

[ColtiXim]

For help : http://www.dsmtuners.com/forums/cylinder-head-short-block/394744-evo-8-pistons-6-bolt.html

 

[RedTsi_PR]

For help : http://www.dsmtuners.com/forums/cylinder-head-short-block/394744-evo-8-pistons-6-bolt.html

Thank u but that page doesn't answer my question.I know that they fit with the proper machining work.My question is,Are they sit lower on the block because of the difference in the wrist pin location?

 

[NOSLO2PT0]

Yes, they sit about 1/8" lower than OEM pistons, effectively reducing your compression ratio back down to stock levels!

 

[RedTsi_PR]

Yes, they sit about 1/8" lower than OEM pistons, effectively reducing your compression ratio back down to stock levels!

Damn i didn't want to hear that.The 2G sit even on the block?

 

[ColtiXim]

Thank u but that page doesn't answer my question.I know that they fit with the proper machining work.My question is,Are they sit lower on the block because of the difference in the wrist pin location?

Sorry !

Good thread : 2g pistons or evo 9 pistons

post28 permalink

 

[NOSLO2PT0]

Damn i didn't want to hear that.The 2G sit even on the block?

Yes. 2G pistons sit flush with the block. I built a 7 bolt block using EVO rods/pistons and didn't like the fact that the pistons sat that low in the block. So I ended up selling it before I even installed. it.

 

[CJ89]

Sorry !

Good thread : 2g pistons or evo 9 pistons

post28 permalink

That took forever to read and im still just as confused as i was when i started

 

[ColtiXim]

That took forever to read and im still just as confused as i was when i started

Keep your mind in peace and take 2G pistons

 

[jrohner]

Im also interested in this as i have a set of eagle 6 bolt rods that i also would like to fit on evo 8-9 pistons.

Any one have any info on this?

Just get aftermarket pistons that fit the rods. If you already have aftermarket rods, why spend the money to modify the rods? You'll end up spending more money on that setup than you would for some manley pistons.

Also, with Evo pistons, you don't get the 8.8:1 compression because the Evo's head is 4ccs smaller -- just like the 1.8L/1.6L head.

 

[ColtiXim]

Also, with Evo pistons, you don't get the 8.8:1 compression because the Evo's head is 4ccs smaller -- just like the 1.8L/1.6L head.

For my information, which EVO has 43cc combustion chamber ?
Thanks and sorry for the thread jacking ..

 

[jrohner]

For my information, which EVO has 43cc combustion chamber ?
Thanks and sorry for the thread jacking ..

8 & 9, I'm not sure if the older ones do.

 

[RedTsi_PR]

Damn i dont know what to do now i already bougjt the piston rings and everything.

 

[hazmat6135]

sellem and get some CP's that match your rods and stroke on the crank.

 

[Bill Hincher]

doesnt sound right, you say the rods are the same but the piston pin location is higher, well the deck hiegth would have to be shorter in the EVO block, but from my experience, location the piston pin higher allows you the use a longer rod and increase the rod ratio, why would you relocate the piston pin , keep the short rod, and lower the block, it doesnt ring true

 

[NOSLO2PT0]

The evo piston itself is shorter.

 

[russell3123]

evo pistons in our blocks run a 8.3:1-8.5:1 compression ratio with a stock sized 1.3mm head gasket

 

[Bill Hincher]

The evo piston itself is shorter.

it wont matter, if the pin is located higher towards the rings, the length of the skirt wont matter, you would need a longer rod because the crank is the same stroke

 

[NOSLO2PT0]

evo pistons in our blocks run a 8.3:1-8.5:1 compression ratio with a stock sized 1.3mm head gasket

And where did you get this information from? What evidence do you have that can support that?

 

[russell3123]

the dome volume on an evo 8-9 head is smaller then a dsm head. so if u use a stock dsm head gasket which i believe is 1.3mm thick it drops the compression to right around 8.5:1.. its 8.8:1 in an evo 8-9 engine

 

[NOSLO2PT0]

It's a LOT closer to 7.8:1 in a dsm block. Do you think that 1/8" gap between the top of the piston and the top of the block means nothing? The evo uses a 43cc head, vs a 47cc head on a DSM. That right there drops the CR almost half a point, to ~8.3:1. Couple that with the 1/8" gap the piston has..## right back to where you started with a stock piston!

 

[RedTsi_PR]

After all i think im going to use them.I buy the pistong rings before knowing this :/

 

[viperlp01]

Its a .5 difference between dsms and evos regarding compression ratio. I don't get why people just don't buy a true forged performance piston. The 6 bolt rod and a manley piston would hold a hell of a lot of power with some ARPs for rod bolts.

 

[NOSLO2PT0]

Its a .5 difference between dsms and evos regarding compression ratio. I don't get why people just don't buy a true forged performance piston. The 6 bolt rod and a manley piston would hold a hell of a lot of power with some ARPs for rod bolts.

### people always wanna go fast for cheap, that's why.