Does anyone know if these are from the same engine family? Can the rotating assembly with different pistons to lower compression be used to bore & stroke an Evo to 2.4, or does the additional bore cause head sealing problems?

evo 2.0 = Bore and Stroke (mm): 85.0 x 88.0
Compression Ratio: 8.8:1
Valvetrain: DOHC 16-Valve

From a new Lancer:
2.4 Liter = 100.0 87.0
Compression Ratio: 9.5:1
Valvetrain: MIVEC SOHC 16-Valve

 

Damn, a 100mm bore is in the new 2.4?

your joking right?!?!

LOL ( what ever that means! ) Daaaaaaaaaaamn, that is a lot of valve area to be had. If that is true, I would imagine that you would have to use that 2.4 block & head due to the valve / bore spacing with a 100 mm bore. If it's possible to geek this engine into our car, IM IN!!

 

The future lies in larger bores for the king of all performance mods...assuming the boost can be kept as high (wafer thin blocks aren't going to cut it...so to pun). I'm going to be very interested in seeing where everyone goes with the larger bores. Larger turbos will spool sooner, big gains in torque even before spool, magnification of all other mod gains....everything we thought the sti was going to have but flunked out.

 

The info is is right off Mitsubishi's site: http://www.mitsucars.com/MMSA/jsp/la...p?t=mechanical
I know on Buick turbos we increase the risk of blowing head gaskets when we go to a larger bore due to lack of sealing surface, just not enough area to distribute the heat and get the cooling between the bores. I know next to nothing about Evo motors.
Anybody out there done assembly work on the Evo motor? How much material between the bores at an 85mm bore? Are these blocks the same externally?

 

No, the 2.4 doesn't have a 100mm bore.

 

Previous reply is correct, I misunderstood. Bore is 87mm and stroke is 100 in the 2.4.

Can anyone answer if any of this can be used in an Evo?

 

why?

 

More displacement = more power and/or torque
I am planning my next purchase and want to be sure of the upgrade path before I buy. I have driven a highly boosted DSM, seen the graphs of built up 2.0 Evo, and read the road reports; all of which showed less low end torque than I like. By all reports the Evo is spectacular overall. It would never make Buick torque and live long, but more is better IMO.

 

You are right; it will never make as much torque as a Buick with full mods, etc. If you drop a 4G64 in there, it isn't really an EVO anymore. The thickness between the cylinders is not much at all. The motor is build for optimum performance, etc. so they didn't give up a lot of extra weight and space if they didn't need it. Your best bet is the 4G64 or simply stroked will a minor upgrade in bore. Most kits are the mere 0.5 or 1.0 mm.
I guess the best explanation was swap a 4G64 for more grunt or leave it with an EVO motor which is essentially characterized as a screamer.

Mark
www.Quantum-Racing.com