Great work guys! It's good to know we have some alternative recourse to the dealer if/when something goes :boom:.

 

Looking good, cant wait to see what this can handle

 

AMS,

So happy to see that you guys got underway with a nice stout 4B11 build. I came over to the EVO X world previously from a long history with Honda/Acura stuff, so I am very familiar with ERL, Benson, Golden Eagle, etc. and the sleeving process.

My main question for you so far is on your main and rod bearings... Does Mitsubishi have different sizing or "colors" like the Honda blocks do? Will you guys be going with a one size fits all ACL setup? I'd imagine that removing material with the line bore will necessitate larger bearings, unless you're looking to run a looser motor.

All in all, I am psyched to see this. My biggest qualm with the X was the AL block, but I knew a fix would come down the road sooner or later.

BTW, did you go with a larger bore with the addition of the thicker sleeves? If so, do you plan to deshroud the combustion chambers on the head? What pistons / rods do you have in mind?

Keep up the good work!

- Louis

 

By the way... I'm a bit dissapointed to see individual main journals on these blocks. Did the 4G63's have a girdle of some kind?

 

One last comment, I promise... haha

I have seen a lot of issues arise with step-decking the blocks with sleeves that are proud of the blocks deck. I know that Dan Benson did a bunch of testing with different sealing techniques (o-rings, step-deck, rough vs. smooth surfaces, etc.) and concluded that the most reliable setup was a completely flat surface for the head to mate to, with the use of an OEM headgasket. Are you guys weary at all of any distortion to the head/motor with the step deck setup?

- Louis

 

When you align hone the mains you also remove a little material from the main cap flat surfaces. This will allow you to resize the journals and keep the tolerances that you need. As far as bearings these block will be set up for standard mitsu bearings until someone comes along and makes aftermarket bearings.

As far as the sleeves and the deck surface goes we will have to see if there is any distortion. We are assured that this is a great way to improve cylinder head sealing. There is only a difference of .003-.004 between the sleeves and the deck.

 

Yes, but the crank is raised slightly, which on Hondas at least... kills oil pumps.

 

Very nice AMS . Subscribed. Question, how much power (or boost) can an unmodified 4B11T make before blowing up?

 

That remains to be seen.. Nobody is pushing the limits of HP on this motor just yet..

 

This is just a dumb comment. I guess you better sell your Z06.

 

Exactly. I am going out on a limb to assume that the X's weakest link are the stock sleeves... which, if they are anywhere near comparable to a Honda sleeve, will make 500whp without problems. The pistons and rods are forged (I believe), so the rotating assembly is pretty stout from the factory.

It really comes down to the heads flow efficiency, etc... combined with the ability to rev high to take advantage of larger turbos like a 40R and bigger. As you make more and more power on a stock motor, the tuners abilities become more and more critical... meaning, the true "horsepower limit" of any stock motor depends largely on the tune and supporting parts such as fuel pump, injector duty, timing, etc.

 

HA HA you beat me to it lol. And great job AMS time to make some serious power

 

Wow...I'm glad you guys are starting on this! Can't wait to see the end results.

 

Yes we will be selling these shortblocks as a core exchange or outright purchase. we will also be selling them as assembled shortblocks of just the sleeved shortblock if you want to do your own thing. Pricing should be released by early next week.

Eric

 

Any 2.3RR blocks in the future for the 4b11T?