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>

 

[Splitpi]

I believe you can use the evo 8/9's pistons with out any modification for a 2G... but I wouldn't bet the farm on my advice with this.

 

[shredwin]

well the guy at slowboys is the one that told me it would fit no problem, plus he said the rods are a lot stronger. I believe the compression would be 8.8:1

 

[JusMX141]

What did they say about flipping the pistons on the rods?

Obviously the "front" of the Evo engine isn't on the same side of the car as ours, even though the Evo's still have the exhaust valves on the front side of the head.

 

[toddevo]

yes they fit no problem ,,what numbers are on the top of the pistons ???

 

[dsm-onster]

What did they say about flipping the pistons on the rods?

Obviously the "front" of the Evo engine isn't on the same side of the car as ours, even though the Evo's still have the exhaust valves on the front side of the head.

That's a valid question. From my understanding stock dsm and evo pistons have an offset wristpin.

 

[wont_luz]

Hmm...I almost used evo 8 pistons in my 6 bolt build with machined rods, I don't remember anything about flipping them. Those should work awesome though.

 

[JusMX141]

Well if you're putting Evo pistons on 6-bolt rods, they would be installed the same as a 2G piston on a 6-bolt rod. Your rod direction isn't a problem in this case.

My question is would the complete Evo rod and piston assembly drop into a 7-bolt and work fine, or would the pistons need to be flipped because the rods would, in theory, be on backwards for our cars?

 

[shredwin]

From what he told me, the only thing I have to do is make sure the piston faces the opposite way, in other words make sure the arrow isnt pointing towards the timing belt. Right now all my stuff is there gettin balanced so I can't really look at them till I get them back.

 

[shredwin]

[QUOTE
Obviously the "front" of the Evo engine isn't on the same side of the car as ours, even though the Evo's still have the exhaust valves on the front side of the head.[/QUOTE]


I agree with you, he explained that to me

 

[toddevo]

when fitting evo 8 pistons and rods to evo3 you dont have to turn them .

 

[shredwin]

when fitting evo 8 pistons and rods to evo3 you dont have to turn them .

yeah but the piston would hit the valve then if you dont turn the poiston around, and I could tell a difference between them 2 pistons. Im gonna see if can get pics of both when I get my stuff back

 

[Purevil]

The pistons and the rods will both work. Even though there is a difference in the valve reliefs it does not hit the valves. If it bothers you, most machine shops can deepen the grooves for a reasonable price. The pistons do have a wrist pin offset and you need them to sit in the correct orientation or the offset will be backwards.

 

[shredwin]

The pistons and the rods will both work. Even though there is a difference in the valve reliefs it does not hit the valves. If it bothers you, most machine shops can deepen the grooves for a reasonable price. The pistons do have a wrist pin offset and you need them to sit in the correct orientation or the offset will be backwards.

I might have them deepen the valve reliefs, I just gotta see how much it would cost

 

[gixrman]

I might have them deepen the valve reliefs, I just gotta see how much it would cost

No you don't I have them machined. I have them in my car now, they work fine I just re-ringed them with evo rings and 2g rod berrings and have had no problems. Thats funny you got them from SB because when I first asked around they told me they wouldnt work and that I was wasting my time. I lined them up the same as the 2g piston in the block. I even did a write up on here somewhere.........

Here it is enjoy!!
http://www.dsmtuners.com/forums/cylinder-head-short-block/244184-can-anyone-help-me.html

 

[JusMX141]

Thats funny you got them from SB because when I first asked around they told me they wouldnt work and that I was wasting my time.

Why does that not surprise me?

I'm SHOCKED that they would laugh at you and tell you it wouldn't work until they find out that you did it successfully....then all of a sudden they're selling them to every 2G 7-bolt owner as an "upgrade".

You must be logged in to view this image or video.

So you can confirm that your car is running fine on these pistons and rods even though the rods are rightfully installed backwards when compared to the originals?

 

[shredwin]

No you don't I have them machined. I have them in my car now, they work fine I just re-ringed them with evo rings and 2g rod berrings and have had no problems. Thats funny you got them from SB because when I first asked around they told me they wouldnt work and that I was wasting my time. I lined them up the same as the 2g piston in the block. I even did a write up on here somewhere.........

Here it is enjoy!!
http://www.dsmtuners.com/forums/cylinder-head-short-block/244184-can-anyone-help-me.html

I wasn't gonna get them but oliver pretty much convinced me, It came with rings, rods, and bearings and looked in good shape. My question is, which way did you point the piston? I know you should make sure the arrow is pointing towards the timing belt, but He told me I would have to intstall it the opposite way so the arrow would face the tranny and not the belts. I wanna use the EVO rods too cause they are much stronger.

 

[gixrman]

I wasn't gonna get them but oliver pretty much convinced me, It came with rings, rods, and bearings and looked in good shape. My question is, which way did you point the piston? I know you should make sure the arrow is pointing towards the timing belt, but He told me I would have to intstall it the opposite way so the arrow would face the tranny and not the belts. I wanna use the EVO rods too cause they are much stronger.

If you look in the link I provided it shows which way the dots on top of the pistons are facing.

if you look at the one picture of the side by side shot there are weep holes that shoot oil to the wrist pin for lubrication. This is what is critical and thats the way I did it. Dots facing towards the timing belt.

 

[shredwin]

If you look in the link I provided it shows which way the dots on top of the pistons are facing.

if you look at the one picture of the side by side shot there are weep holes that shoot oil to the wrist pin for lubrication. This is what is critical and thats the way I did it. Dots facing towards the timing belt.

allright your gonna think im retarded,So your saying is the dot should be facing the timing belt. but what about the indentain on the top of the piston? would that make a difference. The guy told me I had to take both piston and rod and rotate it but if its not gonna hit then Ill face the dot towards the timing belt

 

[dsm-onster]

Did everyone miss the wrist pin off set info????

Why do pistons have an offset wrist pin? What does it do? And how can having the wrong pin offset screw with your tune?

 

[shredwin]

Did everyone miss the wrist pin off set info????

Why do pistons have an offset wrist pin? What does it do? And how can having the wrong pin offset screw with your tune?

well sorry, im not a DSMwiseman like you. Im just trying to get help

 

[delta448]

As long as the dots point toward the timing belt side of the engine, you are fine. Think about it, engine rotation is the same in both blocks with respect to the timing belt side of the engine. In the Evo, the dots point to the passenger side because that's the timing belt side. In your DSM they will point to the driver's side, which is still the timing belt side.

Did everyone miss the wrist pin off set info????

Why do pistons have an offset wrist pin? What does it do? And how can having the wrong pin offset screw with your tune?

The wrist pin is offset because it reduces strain on the rods and reduces out-of-round wear to cylinder walls. As the piston passes TDC, pressure reaches maximum. At that point, the con rod is under the most stress and the piston is subject to the most side loading. The rod is more close to perpendicular when it just passes TDC when the wrist pin is offset. Meaning the piston reaches TDC position at a different moment than when the rod reaches its conventional TDC position, which lessens stresses to the pin. Obviously, the rod is the strongest when pressure acts in a straight line across its long axis. If the pin were not offset, the rod would be "leaning" more as the pressure hit the maximum and would be subjected to more shearing force.

There is a little more to it than that, but this is how I look at it.

 

[dsm-onster]

well sorry, im not a DSMwiseman like you. Im just trying to get help

Friend, I wasn't worried about your response. I was worried about someone doin more damage than good. Which delta488 suggests. You can't put Evo pistons in the same way you put dsm pistons. without putting the maximum capable strenght in question.

 

[delta448]

Here's a good link I found to some more info about wrist pin offset. Basically says everything I alluded to above, only in much more detail, a bit fancier wording and more length. It also goes into the benefit of reducing piston slap, which I didn't mention (on purpose).

Piston Pin Offset

 

[shredwin]

As long as the dots point toward the timing belt side of the engine, you are fine. Think about it, engine rotation is the same in both blocks with respect to the timing belt side of the engine. In the Evo, the dots point to the passenger side because that's the timing belt side. In your DSM they will point to the driver's side, which is still the timing belt side.


The wrist pin is offset because it reduces strain on the rods and reduces out-of-round wear to cylinder walls. As the piston passes TDC, pressure reaches maximum. At that point, the con rod is under the most stress and the piston is subject to the most side loading. The rod is more close to perpendicular when it just passes TDC when the wrist pin is offset. Meaning the piston reaches TDC position at a different moment than when the rod reaches its conventional TDC position, which lessens stresses to the pin. Obviously, the rod is the strongest when pressure acts in a straight line across its long axis. If the pin were not offset, the rod would be "leaning" more as the pressure hit the maximum and would be subjected to more shearing force.

There is a little more to it than that, but this is how I look at it.

Allright man that just helped me out a lot big time, and I appreciate everyone trying to help out with this