I am taking the car in this week end to have the timing belt done, while the car is apart I figured I would remove balance shafts. I have heard relativily good things about doing this, but is their any good reasons why I shouldn't? My mechanic has heard of this on non dsm cars and said from their experiences not to do this to my own car, I said I'd ask around, thanks in advance,

Chris.

I really should have titled the thread "any regrets after balance shaft removal" but oh well.

From what I have read I haven't come across one. But think of this all of the top DSM engine builders remove them so I don't think that they would if there were regrets.

take them out

98spydert said:

Seems to me that an unbalanced lower end won't last nearly as long as it's balanced counter part. The race engines don't see 50k+ miles and honestly, most daily drivers who do this probably don't see that many miles either before braking something/blowing something up. Hopefully someone who has been able to put a good amount of miles on their engine after removing the silent shafts can coment on something besides added vibration.

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all the balance shafts do is counter the vibrations that you feel not the ones inside the motor. dosent matter the only down side is that you feel the motor more. if the rotating assambly is unbalanced balance shafts aren't gonna balance them.

Gone and love it.

I'd be willing to bet that almost no major car manufacturer balances their motors. It would be TONS cheaper to make pistons/rods/cranks meet a certain spec and throw the out of spec pieces away or refurbish (grind down) them than it would be to assemble rotating assembly, throw it on a balance machine, and then add heavy metal, break it down and assemble the motor.

just my .02

98spydert said:

Seems to me that an unbalanced lower end won't last nearly as long as it's balanced counter part. The race engines don't see 50k+ miles and honestly, most daily drivers who do this probably don't see that many miles either before braking something/blowing something up.

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The balance shafts do not "balance" the motor, they simply help tone out natural vibration caused by the motor. 4G63's are well balanced, so removing them wont disrupt the natural balance of the motor enough for a concern. They do lift some load from the reciprocating assembly which can ultimately give you better acceleration. The only thing you need to worry about is sealing the oil pump cover properly (major oil leak if you dont).

All balance shaft removed DSM's I've ridden in dont feel much worse that stock, it's definitly not something that will chatter your teeth .

I had the balance shafts removed this year and my only regret was that I didn't do it sooner.

was there a noticible gain when you took them out? anybody.

Not really any difference that I could notice after the ones in my car came out.

My dsm is a 12 sec daily driver and Ive put several thousand miles on it without the balance shafts and have seen no downside what so ever.

BUCK said:

All of us BSE guys should put him on our Buddy List & wait for his Crankwalk Thread to pop up...

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Interesting. So a 2G BSE'd engine is less likely to crankwalk? Why is that? If the BS only counteract the natural vibrations an engine makes, by producing their own counter-vibrations, how can they effect something going on inside the bottom end?

GPTourer said:

Interesting. So a 2G BSE'd engine is less likely to crankwalk? Why is that? If the BS only counteract the natural vibrations an engine makes, by producing their own counter-vibrations, how can they effect something going on inside the bottom end?

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They also rob valuable oil pressure that is much needed to help prevent crankwalk in the 2g 7bolt. Im assuming this was his meaning.

Deleted a few posts.

Remember the rules.


No Insults and/or name calling - this can get you banned without warning - we don't care how experienced or knowledgable you are, don't be a smart ass!

and


No Guesses - if you don't know, don't reply - don't spread misinformation (no "I think" or "I guess" or "I've heard").

Thanks for keeping the tom foolery in check L2RTSiAWD, and thanks for your guys's help, they are comin off this week, I mean they are coming off next week.


Didn't realize the week is almost gone.

Took them out of my car ... didn't notice any difference good or bad. I think its worth it to take them out because that's less things that can break later on.

The ballance shafts are there for your butt and not anything else. Remember they made these cars for average drivers too. I just seen a 2g with a b/s sticking out the back of the block and that is enouph reason for me. I have had mine out with no down side and recamend taking them out to anyone. I will worn you though, you need to know what you are doing or you could #### somthing up big time.

92tsifwd said:

The ballance shafts are there for your butt and not anything else. Remember they made these cars for average drivers too. I just seen a 2g with a b/s sticking out the back of the block and that is enouph reason for me. I have had mine out with no down side and recamend taking them out to anyone. I will worn you though, you need to know what you are doing or you could #### somthing up big time.

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What do you mean? My mechanic is reading this thread so if you have any pointers feel free..........


The only info on the process that I have I stole from the vfaq, I printed out a copy of that and threw the removal kit at dave (guy working on my car). Any pointers will be super helpful. Thanks,

Chris.

I mean if you don't do it exact it is really easy to make a expensive mistake. Make shure your machanic is familier with the 4g63 in specific.

Are you just saying stuff that sounds good? Or does my mechanic really need to be a 4g63 wizard to pull these balance shafts off, frankly this is probly the first or second dsm he's worked on, but does this mean he is not mechanically enclined enough to do this right?


BTW ive read about backyard mechanics pulling the balance shafts out them selves, why are you saying my mechanic will have a hard time with this?

Well, I was there when mine got removed, I am pretty sure he just took them out and installed the kit that is from mitsubishi for plugging the wholes. I'm not exactly sure, I forget.. BUT the balance shafts are only there to stop vibrations at lower rpms and at idle, For those people who are complainers and want a sound car, With no vibrations or anything. I cannot even notice a difference with mine out really, Vibration wise.

14.5 drift said:

Are you just saying stuff that sounds good? Or does my mechanic really need to be a 4g63 wizard to pull these balance shafts off, frankly this is probly the first or second dsm he's worked on, but does this mean he is not mechanically enclined enough to do this right?


BTW ive read about backyard mechanics pulling the balance shafts out them selves, why are you saying my mechanic will have a hard time with this?

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You know that the rear ballance shaft is driven by the oil pump right? Meaning if the oil pump gears are not installed corectly there could be possible damage done to the engine. You know how mechanically enclined your machanic is, so why are you asking me if he can do it? If he follows the instructions on vfaq.com he should be alright. If you are doing it in the car, it helps to loosen the front motor mount so the oil pump casing clears the sub frame.

1993eclipseGS said:

BUT the balance shafts are only there to stop vibrations at lower rpms and at idle, For those people who are complainers and want a sound car, With no vibrations or anything.

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Not exactly- the Silent Shafts were conceived to cancel the second-order vibrations inherent in an inline, even-firing 4-cylinder engine. First-order (pistons, rods, crankshaft up-and-down) can be dealt with through balancing and counterweighting of the rotating assemblies, but the part where the forces are going out to the sides relative the block can't be cancelled that way. That's the job of the Silent Shafts. It's not a significant problem of engines under 2-liters displacement -rubber mounts can deal with it well enough- but as you get much larger the problem grows. The Silent Shafts developed by Mitsubishi were of sufficient success that Porsche paid Mitsubishi royalties to use them in the 944 engine.

And no, if you think you have a racecar, they won't do a lick for you.

Defiant said:

The Silent Shafts developed by Mitsubishi were of sufficient success that Porsche paid Mitsubishi royalties to use them in the 944 engine.

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Ya, it was Mitsubishi who invented/perfected for use on production engines - the silent shafts to begin with.