best info yet.

and its not so much the power levels, as the harmonics produced by the stock motor -- with balance shafts.

 

I would say most people in this thread understand what a harmonic balancer is supposed to do. The question is do the effects of the extra vibrations seriously reduce the longevity of engine parts? To what effect does this occur? Where is the data to back this up? All engines are going to vibrate to some extent, that is what they do.

Does the difference in vibration from a stock balancer to an aftermarket one really extend the life of an engine? Would be curious to see some actual test data. I am in no way claiming it wouldn't help, but I would be curious to know by how much. Also at what power level is this detrimental? Unfortunately most people never install one, so it would be hard to compare against the stocker.

I have been running over 400hp in this stock engine for 85000 miles now and over 500hp for the last 35000 miles. We will see how long it lasts as that is certainly no where near stock power levels.

 

I personally have one and I can say this, my motor makes 630whp is a 2.0lr with ams balance shaft eliminator is revved to 9k+.
With a solid engine mount on the front I do not have any extreme vibrations, With that said I I believe if you are going to have a stock motor pushing 400whp you dont need it. If you are going to build a motor and go for 500+ why would you not want something that makes your high strung 4cyl engine more reliable by eliminating some of the harmful vibrations that cause bearing failure, not to mention slightly increase horsepower.

 

Great Info's Guys...

Thanks

 

I think we all know what it actually does it is called a dampener after all and doesn't make things wet, so obviously it reduces vibrations which should be common sense. And yes weight does have more than you think of an effect on rotational mass and inertia.

 

i STILL run the OEM one.. 715 on buschurs dyno, rev well over 9k... no problems at all.

 

That you know about.




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That is the problem with THIS topic. There is no "proof" because its so hard to prove. Its like why some stock cars make more then others? How do you prove why?

The general consensus is that they are better then stock once you remove balance shafts and change the harmonics of the stock motor, because they adapt to all, both new and old vibrations created by the new setup.

How much better? Meh. How much do you gain from adding a thermal gasket between your head and intake manifold? Is it better? Yeah. How much better? Who knows.

 

Stock damp here on my drag car. I have seen way to many cars lose a motor because of aftermarket damps. It is not worth it if you ask me. A lot of them tend to fail. I have a 2.4 and it is very "vibby" and the OEM is working just fine. I'm not to nice to my motor either.

Mikey

 

Mr Kiggly runs a stock dampner on his 2.3 litre engine running to 9200rpm.
Good enough for me.

 

Do you understand where I was coming from though? Obviously you dont know that it is better or worse then oem. Ive actually seen OEM ones from dsms SPIN, such that the timing marks no longer lined up because the two parts slid on the rubber mating surface.


The only failures from dampners I have ever seen was those cheap *** light weight crank pullys(that arent even dampners) from ebay.

Does anyone have any link, to any forum, on any car, of a fluidampr/ati failing?

 

the ati is known for having a loose fit on the crank which renders it ineffective and fluid dampners dont get much respect in most forms of racing. the fact is no dampner is one size fits all. they all are tuned to a specific frequency range and i bet mitsubishi engineers are closer to optimum than an aftermarket company that just copied the stock one dimensionally and guessed on its frequency.

 

If building a motor i would buy a new oem damper at least. Dont use an old beat up one. Also if doing a 2.3l order a damper from a 2.4l car. Rubber ages so an old damper should be replaced if there is any cracking.

 

People use the 2.4 damper instead of the Evo damper? Are there differences?

 

If you aren't removing the balance shafts, should you go aftermarket or stick with OEM?

 

maybe someone smarter than me can chime in, but i doubt balance shafts and the vibrations you feel have anything to do with a dampner. different frequencies.