Any 2Gs with Evo Pistons?

[shredwin]

I just purchased this Evo pistons down slowboys, they are used but look in good shape plus I got a good deal. I believe they either came off the Evo 8 or 9. My question is if there are any 2Gs out there with these piston? If your one of them please tell me if your pleased with them or if they are not worth it. Im in the process of rebuilding my motor and im just curious since im still wating for my stuff to be done at slowboys. here is a pic of the pistons.
<a href="http://s74.photobucket.com/albums/i252/shredwin/?action=view&current=Evopistons.jpg" target="_blank"><img src="http://i74.photobucket.com/albums/i252/shredwin/Evopistons.jpg" border="0" alt="Photobucket"></a>

 

[ove_98 TSI]

thats what i was thinking, i took them to my local machine shop and they charged me 20$. i asked them if they had to do anything else and they said they checked them and they were fine.
what bad can come from not line honing them?

 

[gixrman]

thats what i was thinking, i took them to my local machine shop and they charged me 20$. i asked them if they had to do anything else and they said they checked them and they were fine.
what bad can come from not line honing them?

You'll find out quickly when you plasti-gauge them during install. Check clearances and make sure there within spec.

 

[dsm-onster]

Yes. At least check their specs. You could still fall in spec. . . It's just not good engine building not to line hone bearing seats after swapping rod and/or main bolts.

 

[ove_98 TSI]

yes i had checked clearances they were all between .002 and .003

 

[zckry]

Let me get this straight, to do an evo 8 or evo 9 piston swap to my 6-bolt I need to do the following:
*Have 1G rod wrist pin's machined like I would have done if using 2G pistons on 1G rods
*Install the pistons in reverse or no? Which way should the dots be facing? Timing belt side?
*Use the correct offset rings? Which are which ones?

Anything else?

 

[grimdsm]

Slightly higher CR, rods are stronger than 1g, or 2g rods and piston skirts have anti-friction coating. Its just an alternative to going all out forged. I did honestly just to see if it would work.

Evo 9 pistons are forged

 

[gixrman]

Let me get this straight, to do an evo 8 or evo 9 piston swap to my 6-bolt I need to do the following:
*Have 1G rod wrist pin's machined like I would have done if using 2G pistons on 1G rods
*Install the pistons in reverse or no? Which way should the dots be facing? Timing belt side?
*Use the correct offset rings? Which are which ones?

Anything else?

I don't know about the wrist pins I used EVO8 rods.
I installed them the same as my 2g with the dots facing the TB.
What the hell are offset rings? I bought a new set of EVO8 rings, if you look back at my original post it shows the part#'s and install pictures.

 

[zckry]

I don't know about the wrist pins I used EVO8 rods.
I installed them the same as my 2g with the dots facing the TB.
What the hell are offset rings? I bought a new set of EVO8 rings, if you look back at my original post it shows the part#'s and install pictures.

Sorry I typed that up real quick and was confusing my wrist pins with piston rings
I simply meant what piston rings do I use.

If I do this I plan on using my 1G rods because of their strength and because I already have perfectly fine ones in my 6-bolt block

 

[DSMunknown]

Below is a mock setup of a 2G piston and an Evo 9 piston. The 2G is on the left, and the Evo on the right. The 2G had some negative interactions with the valves, as you can tell. They are sitting in a 7-bolt block at TDC. They are using their respective rods.

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[dsm-onster]

Anthony, I couldn't reply to your PM because your box is full

I'm sure you can have rods custom made. . .Pauter is the company that comes to mind. Click.

 

[chuckdog_5]

what about evo 9 rods and evo 9 pistons in a 6bolt

 

[kevbojunior]

i picked up a set of evo 9 rods and pistons with the wrings for 250 shipped to my door. im guessing the best way to get accurate info is to contact thedsmgraveyard as they sell the motors built with these internals.

 

[dsm-onster]

what about evo 9 rods and evo 9 pistons in a 6bolt

No the big end needs to be wider. A 6bolt rod is machined to fit the 7bolt crank by cutting it to fit in the thinner journal.

You still will have the piston at a lower deck hight. Correct me if I'm wrong, but the evo pistons sit in their block just like this. Apparently, Mitsu had abandoned the quench pad design pretty much with the later evo 4g63 motors. . .

 

[Strm Trpr]

Below is a mock setup of a 2G piston and an Evo 9 piston. The 2G is on the left, and the Evo on the right. The 2G had some negative interactions with the valves, as you can tell. They are sitting in a 7-bolt block at TDC. They are using their respective rods.

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You know, believe it or not, I actually saw that the compression height, (center of wrist pin to crown of piston) of the 2g to Evo IX piston was not the same in the below picture.
Your ^^^ mock up clarifies this.
When installing the Evo IX pistons in a dsm it's OK to have the valve reliefs under the wrong valves due to the extra deck clearance.

DSMunknown, can you verify if both stock pistons have any horizontal wrist pin offset at all?
I would imagine with a rod/stroke ratio of 1.70 stock any horizontal wrist pin offset is not necessary.
It's obvious they have different compression heights.
And we can clearly see that the Evo IX piston has a much smaller dish volume.
This is necessary because of the additional deck clearance Mitsu Engineers designed into the pistons to bring the compression ratio back up.
The good thing about the additional deck clearance is that it gives a little more clearance for the inadvertent piston to valve kiss which is the result of a broken or slipped T-Belt.

 

[dsm-onster]

I still like more squish or quench zone. I can keep a head/block in time. Whether or not the quench zones are a real benefit, I still like all my gas/air closer to the spark plug, vs. not worrying about valve to piston kiss. the compression benefit isn't very much and 6bolt rods and and 1g/2g pistons are good to 600whp. Anything more and you should be looking at aftermarket upgrades regardless of evo pistons/rods or 6bolt. . .

 

[ifeelubu]

I am thinkin of getting a 7 bolt or 6 bolt with the evo pistons but i havent hear from any one in this thread whats the perfomance gain like hp or torque that you get form these pistons I know it depends on your set up but lets say over stock pistons anybody dyno with them on yet. So far only thing I heard from them is that they run great with no issues .

 

[dsm-onster]

They arn't going to net you much more power (8.8CR vs. 8.5CR). A dyno run would be pointless, unless it showed a 7bolt motor eclipsing the 600whp mark. or even the 550whp mark. . .

 

[shredwin]

I think people have used the evo pistons because they are stronger than the stock 2G pistons... I im running them because when I was rebuilding my motor one of the workers at slowboys asked me if I would be interested. He convinced me because he said they were a lot stronger and didnt have that many miles on them. Oh yeah he gave me everything rings, rods, and pistons bearings for 100 Bucks. I couldnt pass up the deal

 

[NOSLO2PT0]

Bringing this back up. So...are we saying that in order to drop an EVO9 rod/piston set into a 1G 7 bolt motor, NOTHING needs to be done except to make sure the dot is facing the timing belt side? THAT'S IT?

 

[cory51191]

an EVO 8 has a 4g63t btw.......

 

[Boomdeeze]

Quote:
Originally Posted by 1timehondalover
The offset on the pin in the Evo piston should be very near identical to the offset in a DSM piston.
I don't understand all the commotion over turning the pistons around. The valves are oriented the same in both engines so there is no need to modify the valve reliefs. The engines both rotate in the same directions (which would dictate wristpin offset) so the pistons should not be turned.

The only difference (that matters in this thread) between the 2 engines is which side the timing belt is on.
As long as your marks on the pistons point towards the bell housing and not the T-belt you're golden."


I was told to point the dots on the pistons towards the T-belt in my 2G GSX. I bought them at DSM Graveyard and they told me to make sure that the dots were facing the T-belt. As they have built cars at the shop with the EVO 9 pistons and they put the dots towards the T-belt and thats the best way to do it. I will be getting my motor back at the end of this week. I had my short block built by Motors by Gosh. If you have any questions about placement of the pistons you can call DSMGraveyard and ask for John, he will tell you all about the EVO 9 pistons.

 

[tristanmb81]

my evo piston won't fit my 7 bolt 2g block.

 

[shredwin]

my evo piston won't fit my 7 bolt 2g block.

how come? it should fit just fine

 

[tristanmb81]

that's what i thought but, apparently the skirt seems to be .01-.02mm bigger that the bore of the stock cylinder. however, if i turn the piston upside down it would a very tight fit. i did some research and the dsm stock piston size 84.98mm vs evo 85mm. i'm deciding if i should just hone until it fits or bringing the block to the shop to get it slightly bored?

 

[shredwin]

hmmm... thats weird, I didnt have that problem when I dropped mine in. honing would be a good idea though. put a little bit of lube in the cylinder and the piston and gently see if it will drop, unless you already tried that....