I find it hillarious. It is quite possible one of THE greatest 4cylinders ever built.

 

they probably had issues with the stock oil pumps,alot of k series guys now use a modded f20,22c oil pump for high rpm applications...

 

Found this little gem hidden in the paragraph. What are the bearing clearances? When assembling did you have the bearings coated? How did they look?

http://www.enginebuildermag.com/Arti...gs_go_bad.aspx

Do you have a lot of experience building 4g motors or motors in general? I don't mean to question but this seems to be a serious problem people are overlooking.

 

I am not concerned with records he is setting. I don't know who is behind the screen name nor do I care. The question was a LEADING question. His answer will lead to my next question.

I really want to see what those bearings that took the pounding looked like. Then we (well based on the quality of tech advice presented on these forums I should say a few of us) can come together and figure out what the problem and fix could be. As he stated he hasnt figured it out. I am more concerned with that bearing than the other concerns in this thread.

 

usefull stuff!. I never timed one with balance shafts so I didn't know

 

w00t nevermind.

Looser clearances would have been my first guess. Have you run you clearances by other "race motor assemblers"? I'm sure a guy with your fan base would be able to coax a few trade secrets out of them.

Also with lighter rotating parts are you not now in a sense weakening the strength of the bottom end? In particular the piston.

 

It seems built ported k20 heads flow like this
360+CFM CNC Ported Head
Sources:
http://prayoontoracing.koalaco.com/o...longblock.html

These same builders just broke 400whp Dynojet All Motor

 

That is DISGUSTING!!!!!

 

.....and now you know why some of these Honda's can make 300+whp on NA applications w/ 2-2.4liters....

 

I came from a K20 and I have a 4G63 now...the K20 is quite possibly the best 4 cylinder engine ever conceived. Able to rev 9k out of the factory and boosted, it is well capable of mid 500whp every day without even having to worry about the internals.

Granted the Evo is a better platform with AWD and that's really the only thing wrong with the RSX, that it's FWD. Had it been a RWD platform, it would be absolutely phenomenal. I still love seeing modded K20s on the road and the engine is really something to behold.

But to answer your question, the main thing allowing the K20 to rev higher than the 4G64 is the rotating assembly mass. The 4G64 can rev high but I believe people think falsely of it because people that DO have the 4G64 choose not to rev it out because it falls flat on it's face. The K20 however just keeps pulling, even up top, due to better air flow.

Regardless, I'm sure you can find someone that'll rev the 4G64 close to a K-frankenstein but most do not because it loses out up top.

 

I really must be missing something, first off I never said it was a bad engine I said it was lesser, and since the 4g63 held Highest specific engine output for a forced induction engine until the 4b11t took the title I would say that makes it the best 4 banger ever made. I dont think the K series has any such bragging right.

As for it making 500whp on stock block...Evo's do that too and since we lose more thru the drivetrain, the engine is actually holding more HP then a K seires putting down the same numbers to the wheel.

So what am I missing? The slightly higher revs? Honestly if I had to pick a honda engine the J spec f20c seems like a better engine to me. Since its 127.5 hp is higher then the K series 120 hp per liter.

I think the biggest shocker is that Im having this argument on a Mitsubishi enthusiast forum lol, I got it the K series is a very well built engine. But if it really was that good and it was just the Evos AWD that make it the perfered platform why don't I see honda swaps beign the think to make power? I see guys spending 10 20 30k on building the 4g63 and running in the 8s and 9, not paying for swaps. I have seen 4g powered Hondas though...

 

The 2.0l lives pretty well at OEM clearances (~2.0), so nobody really messes with main clearances very much. I'm also somewhat breaking new ground with these engines, so I expect the learning curve to be my own.

Not at all. I'm going the route of more optimized designs/systems and actually shooting for lower stresses and overall better parts. I'm going for a net gain here, not trading off reliability by making things weaker in some way.

Kevin

 

Look as I told you in PM I love my Evo best car I have ever owned. AWD for amazing handling and no worry winter duties, 4 doors, and ridiculous tuning potential and support.

But the K series engine is quite amazing, to bash it is foolish, and I don't feel in any sense of the word that it is a lesser engine

 

If I have one million dollars and you have nine hundred and ninty-nine thousand nine hundred and ninty-nine dollars. You have a lesser ammount. Still more then enough in my opinion.

I'm a 49ers fan I hate to admit it but any time that they have been tied with or lost in an upset to Im gonan still say my team is better. Appearently Im one of the only Mitsu enthusiasts on the forum.

Mitsu > Honda, I picked a team and I roll with it. As good as the K series is it is still a lesser engine to me. 4g63 > Any other 4 banger and thats the beauty of an open forum I can express my opinion freely.

 

And again we'll agree to disagree.

Stay safe over there, and thanks for doing what you guys do