2g with Evo X pistons and rods..

[suprasalas]

Well to day I'm taking my block apart since I blew a rod on my 7bolt. I order brand new piston and rods from a 2010 evo x.. I don't know very much about evos but I do know they are very similar especially because most evos use the 4g63 engine block.. But I haven't seen no threads of anyone using the new evo x pistons on there 4g63 other then the dsm graveyard. I do know that there piston is 1mm (.040over) bigger then my 7 bolt 4g63 block. So I am taking my block to get bore this weekend but im not getting it back in till next Thursday because they are so busy not to mention that the piston don't arrive in till this Wednesday.. I will be posting update's and pic's as my project comes along.. I would really like some advice or hits if anyone know a lot of the new evos pistons and the things I would need to complete my project or should I say my daily driver.. thanks

 

[honda_burner]

And what a lovely opinion it is. Kind of loses some luster when you learn what stock boost is on an Evo X (hint: it's over 20), but it's still a lovely opinion and you should keep it forever. In fact, you should probably avoid sharing it again, so no-one steals it.

that's awesome!!!!!!!

 

[suprasalas]

left 7 bolt right Evo X.jpg

Evo x piston top

evo x piston on 7 bolt rod

sorry but i didn't have to much light this is the best i can do..

 

[Planckscale]

Thanks for the effort and the positive results..this is what keeps the hobby going.

 

[bmoha7321]

I could see going to the EVOx piston as it might be a bit stronger than stock 7 bolt. But if you have already damaged a 7 bolt rod why would you replace it with a 7 bolt rod? Maybe I read it wrong? I don't have a problem with the piston I would just have thought you would at the very least go to a 6 bolt rod for increased strength over a part that you have already failed.

 

[suprasalas]

Well in reality I think 6 and 7 bolt rods have the same straight. The only really bad thing is that 7 bolt rods have bad reputation. Ive been pushing the rods and the pistons to 20psi and yet they still holding strong.(imo its how u take care of ## engine, u maintenance and change ## oil every so often it should last) On the good side I only had to bore the 7bolt 1mm bigger not like the 6bolt rod, that I would have bore it 2mm bigger.

 

[jrohner]

But have you seen the difference between the 6-bolt and 7-bolt rod (and rod bolts)?

 

[PieEyedPiper]

But have you seen the difference between the 6-bolt and 7-bolt rod (and rod bolts)?

I was just going to say; the difference is clear and proven.

 

[m_0ney_pit]

Does anyone have the part numbers for the 86.5mm and 87mm pistons? I can't seem to find them.

Also whats the difference between the 86mm A,B, and C parts?

 

[rx7ttlm]

So what everyone's forgetting is the compression height difference, the wrist pin diameter difference AND the dish volume. Whoever, after stopping to calculate it. I think you still come out on top. 9.3:1 using my head as a cc reference.

BTW people, the reason Mitz went with the hyperutectic piston is because it's a street car first. The cast/ hyper pistons have a smaller piston to wall value for clearance. I think it's 1 and a half to 2 thou. Burns less oil, smogs better and no pre warm noise. If I can get my machinist to do the 23mm wrist pin my daily driver 1g will be getting x pistons on 6 bolt rods as a budget build. The other reason the x pistons are better, is because the damn valves are releaved in the right place now . (8/9 are backwards in our application)

To the rod argument. The 6 bolt rods are actually a fair bit stronger than the 7 bolt 2g rods. I personally wouldn't bother putting those in an engine with over 300 hp. While they are lighter they do bend easier when you detonate the engine. I have seen many horse shoe 7 bolt rods.

oh, and money pit- unless your running a 4g64 I wouldn't suggest running bigger than 86. That is getting damn thin for the cylinder walls and you risk cracking one. I would have the block sonic tested first to see if there is enough meat on it. Keep in mind these blocks are sand cast, so no 2 are exactly the same internally (water passages and non machined surfaces)

 

[delta448]

Hypereutectic = less thermal expansion and more brittle due to a much higher silicon content. Absolutely great for emissions and people who don't let their car fully warm up before beating on it, but definitely not the best choice for all-out performance.

rx7ttlm understands what I'm saying and he has a proper purpose in mind for them. I feel like the rest of you guys don't understand that they aren't a performance upgrade, especially when they weren't even made for the same engine. Given that these pistons increase the static compression ratio of your shortblock, I'd be very wary of detonation while tuning. Don't expect to run these for long with a stock tune in your ECU.

 

[m_0ney_pit]

Yep this is for a 92 4g64 block.
So apparently the oversize parts aren't in the standard mitsu parts catalog. There is a 0.25mm oversized piston which is 1110B730 and 1110C329 but these aren't going to work for the 4g64 because thats only 86.25mm. Apparently there is no 0.5mm or 1mm over piston available for the X unless I'm missing something.

 

[DuricsmitGST]

What's the benefit of running x pistons? cheaper?