Has anyone built a higher hp engine with balance shafts? I have a 2.3 and was wondering how smooth the engine would be with the 2.4 balance shafts installed.
So before you call me crazy, hear me out.

After building my entire powertrain and driving a 750hp setup for a while. I must say my car is a little more crude than i want it to be. A few of my mods were maybe not the best choice. There are 2 things i dont like about my car.

1- The old style QM clutch is a noisey bastard. I do love how it performes and i dont mind it being tough/harsh. But at idle it sounds like a box of rocks and decel noise in terriable while driving. Not a great street clutch. So im looking into the new QM to replace it or maybe and exedy tripple.

2-Engine fibration! I have AMS motor mounts and im thinking that going back to stock ones on the sides would help alot and leaving the front ams mount.

I was thinking how come i cant put a set of 2.4 balance shafts in and even more reduce vibration. Im not concerned with a 10hp loss. And an oem balance shaft belt should last as long as a timing belt. I rev my engine to 8500rpm which is not that high.

What i am trying to acheave here is to make my car a more street freindly and comfortable ride while still rocking 750hp. Or 740.

What do you guys think? A 750hp engine that is as smooth at a stocker? Sounds sweet to me.

 

Exedy Triple and just the front AMS mount?

 

stock blocks of all years have been pushed to 650 whp. never hear of balance shaft failure. its always a rod through the block. I build all my block WITH balance shafts. there is a reason Mitsu included them. drag cars should do away wit them.

the new quarter master will be just as noisy as old one. maybe more so. it has extra set of floating splines that will add noise. the exedy tripple is even noisier than the quarter master but drives WAY nicer.

 

I got a GREAT condition exedy triple for sale and it's been converted to a push style too. It doesn't make any noise at idle unless you press the clutch in, but it isn't that bad IMO. It makes less noise than a Tilton does. Not sure about QM. Very easy to get used to and drives like a DREAM compared to other race clutches.

 

It would be nice.

 

For the record i think my QM is the loudest EVER. I have never heard an evo sound like mine to this day...

 

You guys need to get with the picture and get the new street/strip version doesn't sound like a dying seal.

 

http://www.youtube.com/watch?v=F8O3wW6uB7A

Always a great thing to hear on a built motor. Don't be stupid, get rid of them.

If you want a civil 750hp daily, buy something that comes with that much out of the factory. You're taking an already pumped-up cheaply-made econobox and more than doubling the impressive factory 300hp. Of course the clutch is going to go from "workable" to "retarded," the interior from "bearable" to "rattle-trap," and the vibrations from "acceptable" to "my rear-view mirror gives me headaches."

 

a properly built engine with a good tune will not have problems with balance shafts. horsepower made is not even in the equation. RPM maybe. balance shafts fail because of oil contamination and nothing else. I have never had balance shaft failure in my builds. strokers that make mad torque and rev to occasional 9000 rpm. If anything high horsepower engines will have longer life with balance shafts. smoother running engines last longer than vibrating onces.

 

I like this

 

My 2.3 is not to bad browningderek with the balance shafts eliminated with the stubby shaft.

The trick is to keep all the engine mounts stock, but change the front trans mount / roll stopper out for something aftermarket.. this keeps wheel hop from occurring on stock mounts.

I cant even begin to imagine how much restriction the balance shafts would be at 800hp levels.. im sure its not something you want to find out either..

Aside from maybe now when its 30f outside and i fire the car cold, you would never know it has a 2.3L in it with no balance shafts.. there are zero vibrations in the summer time, but of course right now when its 30f outside and the cars as stiff as a rock the apillers and such may make a slight vibration until the car fully warms up.

Hope i helped some. This is with the car idling in the neighborhood of 1000-1200rpm.

Also.. ive had aftermarket mounts all around before and it wasn't fun. i would sell my car if i had to deal with that vibration.. so that gives you an idea how picky i am with vibrations.

 

Maybe ill pick up some stock side mounts and put them in just to see how much change I get. Might be worth it since my evo is my dd.

 

94AWDcoupe, That is what i have been thinking. I dont see why they would not work. Just an option.....

tcomp, I'm going back to the stock ones for sure. The vibration sucks and for what? My car still wheel hops.

Im not going to just throw some balance shafts in there, i was just wondering if anyone had done it. I think it is possiable to get my car more street friendly without losing much, if any performance.The tranny/clutch sounds like a damn box of rocks at idle. It really is stupid loud. The decel noise at 2200-3000rpm is also crazy loud. I never decel anymore, i push the clutch is and use the brakes. Which is why my pads are worn out.

I dont think you would lose much power tcomp. I dont see why it would lose anymore than a stocker. Its not like they get harder to turn and 2.3's dont rev high so all im saying is it would be intersting. Dont get me wrong, spining a balance shaft bearing would suck bad! Cause it wouldnt have happened if it wernt there so i hear ya.

So my first move is stock mounts and second is a different clutch. Im leaning towards the new QM. If the mounts fix 75% of my vibration then balance shaft are a no go.

Angryevo8, Does your new QM have alot of decel noise? Noise at idle?

 

i have the exedy triple on my car it seems ok.. but gets bad drive ability wise once it heats up.. it will make that retarded howl noise then grab aggressive as hell out of no where if you rev high to take off when its hot. something the twin never did! but i know the tilton twin does the same thing.. so i guess you cant win no matter what you get.

other then that its great.. its not to loud, etc.. but def louder then the twin. all in all i plan on never going with another clutch.. the triple seems very street able and when its not hot its as easy as stock to drive.

 

The tripple is soo damn expensive compared to the QM twin. I fully understand im never going to have a easy clutch to drive. I'm more interested in making my car not sound like a rattle trap. I can deal with chatter and/or grabbing.

Tcomp, i see you have a BR 2.3.... Will you test your compression with a guage and post results? Mine is 230psi on 2 different guages.

Just wondering if my higher compression might have something to do with the clutch/tranny noise at idle. Cause my engine hits hard when its camming and everytime it does i can here the tranny/clutch clunk.