Man everyone coming out with stroker kits now. I've seen 2.3 L kits out now from Toda and Bozz These cars are going to have sooo many parts out there

 

2.3l damn... that is good....
If I can wait for one more year we probebly get a 3.0 liter Evolution and be sure to get 800+ easily

 

I just found a link that shows that the JUN stroker kit for the Evo is really just a reground stock Mitsubishi crank. BAD idea. The cranks are hardened from the factory. The hardening doesn't penetrate very deep. So if you grind the stock crank for a longer stroke, you lose the hardened bearing surface. And if you re-harden, it is very hard to get even penetration. And you end up hardening surfaces of the crank that are already hardened. This could cause the crank to get brittle and weaken.

On top of this, grinding the stock pins means that the resulting pins will be smaller. They will have a smaller bearing surface, and will be weaker because of their size.

Believe it or not, a MUCH better idea is to use a 4G64 2.4L block from the start. The 2.4L crank will work fine. The 4G64 is NOT a stroker. It has a pretty good rod/stroke ratio (as opposed to a stroked ratio). And the only real difference between a 4G63T block and a 4G64 block is the addition of oil squirters on the 4G63T. It has been shown that you can run without oil quirters. Or you can retrofit them to the 4G64. The other major difference is the deck height, which is obviously taller on the 4G64.

I'm not 100% sure that the latest 4G64 block is compatible with the Evo's 4G63 head and gasket. However, all other generations of head and block can be exchanged fairly easily. So it may just work with the Evo.

 

Here you go:
http://www.junauto.co.jp/products/cy.../index.html?en

MITSUBISHI 4G63 85.5x94.0mm 1029M-M001 2.2L (Shaved Crankshaft)

 

I have a 4g64 in my DSM with a Garrett 60-1 stage 3 wheel and .82 ar exhaust housing it spools up that big turbo like a pin wheel.

ShapeGSX: Why not just use a 7bolt 4g64 crank? It isnt ideal as far as r/s ratio goes but I think it would be easier than getting a whole 64 block in there.

 

That will work, and people have done it. But I thought that it ended up moving the piston wrist pin up into the rings. As well, I have heard "somewhere" that the 4G64 crank in a 4G63 block (gives 2.3L) ends up causing accelerated cylinder bore wear due to the R/S ratio and the short skirt pistons required. That may have been related to the type of piston they used, though.

I'm no stroker expert, though. I'll stick to 2.0L, like the fast guys run...except Marco, who will eventually own us all.

 

FYI It happens on the 64 too although not as bad.

 

I don't think so. Here is what that crank looks like when the start shaving.

 

Are you sure about that? Because that isn't a crank for a Mitsubishi.

 

I've been to their shop and watched them making them. Same goes for Tomei making cams. 60 year old guys who been doing nothing but making engine parts all their lives. Jun is one of the most respected tuners in Japan. How could they put their name on a stock crank and expect it to handle 600-700 hp some of the tuners run over in Japan.

 

I did some digging on their web site. They make a distinction between shaving crankshafts and forging crankshafts. I assumed that "shaving" meant that they shave a stock crank. I was incorrect. Shaving means that they shave the crank out of billet, rather than forging a crank.

My mistake. No need to worry, Claudius.

 

I belive that what they do is shave a crank from a forged billet.

edit: I guess that's not true as they offer both a forged crank and a shaved (billet) crank. I find this surprising as most performance cranks are forged pieces for the increased strength:weight properties the forging process offers.

 

This is a stupid question..

If I want to converte my EVO to 2.2 what should I do other than getting the Stroker kit.. I know if I just installed it strate away my engine will fail I obviously need to change the ECU which I already did.. Is their any thing eles I should do ..
And is it a good idea to keep every thing stock except for the ECU and ex. and put on the 2.2 stroker it on the car . or is it a bad idea..

Thanks