Does any one know of a company that is working on a kit for the Evo X were they use a built 4B12 (2009 2.4 GTS) block with a 4B11T head?

That way you have 2.4 without the need to stroke it.

 

the 4B11T is forged , any other engine block is not. Why would you downgrade?
I think even the 4B11 is not forged either.

 

I'm thinking that it would be a bottom end kit from a tuner shop. It would be built up with forged parts.

 

If its a built motor its not really a down grade besides the 4b11t is limited because
its a aluminum block needs to be sleeved for any 550~plus applications so the 2.4 sounds like a good idea
i havent heard of any shops doing it but im going to keep my eye out now

 

I don't think the whole block is made of forged aluminum alloy, just some parts like pistons etc. The Block itself is cast aluminum alloy I believe.

 

ya, I thought I saw a pic/reveiw of a 4b11 block and it was alum with forged sleeves.

 

the evo service cd if i'm right it said , the 4B11T block is forged. VS the 4B11.
Fact they even point out the whole engine is over %90 different.

I'll have to check again
I'll be back

 

sorry it said "more internal structural strength and cooling capability vs the 4B11" Not forged.

http://www.youtube.com/watch?v=0RoxR...p?t=15&page=43
first 3 minutes. You can skipp the first 1 for sure.

 

the 4b12 crank is forged just like the 4b11t

 

yeah , that is one thing if they are a same.

 

I can tell you the 4b11t is holding over 550 whp on stock internals with no failure so far, but i can't give you the proof... wouldn't be fair to that company. and from what i remember, the 4b11t is sleeved.

wasn't there a post on here a few weeks ago of someone in florida that's building a 4b12 block for his X?

 

I dont think anyone on here is arguing that the 4b11t is weak by any means rather looking for options when it comes time for more then the block can handle which seems to be around the 550whp mark on certain dynos at this time ,,,,,

so why not get more displacement when you decide to build your motor this is why the previous generation 4g64 was so popular more torque quicker spool something anyone running a large turbo will be looking for

It seems the 4b11t will need to be re-sleeved in order to handle more power then above stated why not go for more displacement and see where it takes you this how innovation works steming from new ideas put into motion by others dreams.(and money)

 

makes sense what you saying, but here is my take.
The evo X is already comes with short gear ratio. So when you go for higher displacement usually you lowering your top rpm.
Now here is the interesting part, why would you limit your 4th gear trap speed which is so important in the Evo's in 1/4 mile? (I assume you want to drag race,
The 4B11T is a perfect square engine bore , which is perfect for high and quick raising rpm. plus it have a chain timing belt , which is also good for a same purpose.
Why not spend money to make a safer higher rpm running engine vs the bigger bore?
benefits are obvious with Rpm raise. More top speed in gears + more hp.

I would love to have a 9-10k rev limit 4B11t. And i do not think it is impossible.
But i'm not a mechanical engineer.
Just my simple mind thinking. I see more benefits from higher rpm from the Evo X engine then more lower rpm TQ.

Rob

 

getsideways, your right on.
That exactly what I was thinking, although Robevo RS has a good point about the short gear ratio. It drives me nuts that I'm in 5th going 70mph @ 4K RPM!

 

makes sense. If someone does do the stroker, and as a result lower the max RPM, then they'd need to re-calibrate their gear-box (read "replace" gear box with new ratios) to suit the new torque/HP curve and limits of the engine.