i'm not trying to argue,but you shouldn't say things that have no basis in reality in people's threads and get people worried about their builds.it's obvious you have heard a couple things about EVO motors and then misconstrued them and what you thought you heard.

then you went on to say that the extra 1.5mm or less if the 4G63 is bored up top makes the cylinder walls to thin.1.5mm is pretty small.the head gaskets set up just fine on a 4G64.

then you say the crank breaks in the 4G64,but the 4G64 block has nothing to do with the crank breaking and the 100mm crank has been used in thousands of high hp applications for years.i don't think you understand what you are saying about the crank doesn't even apply to the block so you might be right that there is no point in arguing.

it's clear that you don't even understand what i have said so i won't try to argue,but i will try to state some facts so people with 4G64 blocks won't be worried b/c some random guy said they are no no good.the 4G64 block is just as good as the 4G63 and for 100mm crank it may be even better.

 

The problem with the 2.4L is due because of two major concerns, first: Since it is a 2.4L then it should have a compression piston ratio over 9.5:1 I guess, so you have to lowered that compression considerably in order to make high boost or high HP numbers safety. Second, it is possible that the 2.4L came tuned for more Naturally Aspirated intended use, so maybe the ignition could be a little advanced from factory, and maybe the cam gears are also advanced degrees to make a more throttle response and more acceleration and to improve the low end torque with NA engine; so it is needed to retard ignition and retard cams considerably in order to improve the top end power levels. I think that the 2.4L Turbocharged is a good challenge project but only with a STANDALONE FULLY PROGRAMMABLE ECU. NOT FACTORY ECU, since maybe also the MAP SENSOR THEY USE ON THE 2.4L ARE 1BAR ONLY, ETC. ETC. ETC. You can try buying a 3bar Omni MAP sensor, and confirms if it improves or not the boost readings. Thanks a lot.

 

You are way off base thinking people put these motors into the Evo and leave the stock 2.0l tune

Why would lower compression be a problem? The motor doesn't know if it is 9.5:1 or 10.5:1

Nobody is using a "stock long block" 2.4l, and nobody is using the stock 4g64 head, nobody is using stock 4g63 or 4g64 cams or cam gears in this motor.

What makes this a challenging project? This isn't a difficult project at all.

So what if it uses a 1 bar sensor? I doubt anyone is still running a 1 bar sensor on this site if they are running ECU boost or if they are logging boost.

Again with the tune, who in their right mind puts this motor in their car without a proper tune? The stock ECU is extremely capable of handling this motor and is basically fully programmable.

 

You have some reading to do my friend.

And oil squirters really do make a difference in these builds, as the rod angle like to push the skirt into the cylinder wall, hence why oil squirters were there in the first place.

 

Oil squirters cool the bottom of the piston, its for knock suppression believe it or not.

Do 2.4s break crankshafts? Yes but its really random from what we have seen. I can name more 2.4s above 700whp without problems than ones that have broke cranks. Do they pop headgaskets? Any of our cars will if the deck and head prep are sub par. The 2.4 is very finicky to how that prep is, the RA needs to be off the chart smooth.

Harmonics obviously have a lot to do with how the crank will survive but I think sometimes its the clutch, balancer, reciprocating weight, all coming together. Usage also has alot to do with how its going to survive, launching the crap out of it is going to be hard on it but thats hard on anything. If you are worried about the crank there are a few 4340 options we can use.

Aaron

 

I interpreted what he said differently than you, it sounded to me like he meant using the 4G64 crank in the 4G64 block created a condition around the journals which does not exist when you use that crank, but in a 4G63 block. And as far as cylinder wall thickness why would you not want every little bit you can get? I have heard plenty of shops mention not really wanting to go 0.040 over on a 4G63 block for really high boot applications, due to wall strength and head gasket sealing.. not sure what the final difference in actual cylinder wall thickness is (between cylinders) when you compare a 4G63 bored 0.040 over, to a 4G64 with stock or just a cleanup done on its bores.

I've never owned one so I'm not joining any sides of what's good or bad, it's just an interesting subject that I'd like to hear more technical information about..

 

Local shop here has only ever had two cranks break and both were 2.4's on top of that talking with ER even they said the 2.4's seem to randomly fail so if reliability is your goal then this "might" not be the best motor for that.

 

the crank journals are the same no matter what block you put it.

this is what he said:
the 4G64 is the block,not the crank.

the crank is the 100mm that also goes in all the 2.3L strokers out there.i actually have a broken one in my garage,but i believe it broke because the OEM crank jounals are undercut where they meet the throw.the 100mm crank that i have in my garage broke in a 2.3.again the 4G64 does not break cranks,the 100mm cranks may break,but they will break just the same in a 4G63.that's why you buy a billet crank or a race crank.i don't like the undercut journals in any high hp application.

 

Sounds like the benefits still outweigh the risks to me

 

My 2.4 has been fine at over 700 for almost 15k miles.

 

No.

Just no.

 

lol.

 

Those were the only 2. There arent that many that randomly fail.

 

I was kind of expecting a flood of 2.4L owners in the 500-600whp range to step up saying they DD their cars and have 20k+ miles without failure but so far... nothing.

 

If you want to completely discount what ER is saying (given the fact they probably do more 2.4's then any other shop on this board) then thats on you.

I'm swapping my 2.4 into another car so I will be over 20k very soon.