I searched apparently search is down or something. I was considering a UR crank pulley I'm not sure. I know the motor is internally balanced and the pulley isn't harmonically balanced but what about the vibrational aspect.....
any insight....These motors were designed with a certain weight pulley on the end for balance. How would this not shorten the life of bearings??

 

The motor is internally balanced and the pulley does not act as a hrmonic balancer. This shouldn't shorten the life of the engine or have any effect on anything. There are plenty of users out there that have done this modification over long periods of time without incident.

 

Search....

 

Search is down. Says so in the thread

 

So the stock pulley or damper whatever you would like to call it has a rubber matted ring in it for dampening. You go to the UR one and its all aluminum. So why wouldn't it shake the crap out of the rotating assembly? If you remove the damper what acts as the damper? All Honda / Acura motors have the pulley / damper with the rubber matted ring in it.

 

I think beacause it's so much lighter, any ammount of vibration in the pulley wouldn't transfer nearly as much felt vibration as would the super heavy steel pulley. Also, the machining of this pulley is probably alot more precise than the stock one.

 

I understand its lighter but it still doesn't have the rubber ring to absorb the vibration.
I'm passing on the UR pulley. I'll sacrifice 5hp and save the longevity of the motor.
I highly doubt the UR is made more precisely than a stock honda part.

 

You need to hold the UR pulley in you hand and you will change your mind. Lucky me being a sales rep I have about 230,000 miles on two different J32 motors over eight years and NO problems with this pulley. It is a great and safe mod.

 

Yeah, JD, when your search starts working again this has been touched on in almost every UR thread.

Short answer is no one can explain the elastomeric bearing in the stock pulley but 2G TL owners have hundreds of thousands of miles with no ill effects. It is a beautifully crafted part.

 

It's most likely there to help meet NVH "standards" (noise, vibration, harshness).

 

A 1/10 ounce rubber ring has no effect on your engine's internals.

 

I already got an email back about the search. The mod said the server broke and they would have someone looking at it today. Should be working any day now.

I just got the pulley done and it is really a night and day change. All for the better. In my opinion I think that the engine runs better with it.

 

The rubber ring (elastomer) used in Honda's crank pulleys is there to reduce engine noise. That rubber ring does not absorb vibration like you are thinking of. You are thinking of older domestic V8's. There are 2nd gen CL/TL customers with over 200k with the crank pulley with no issues. If you were running 3 times the factory hp or revving past the factory redline then you want an aftermarket damper like ATI or Fluidampr.

And yes the UR pulleys are CNC and 0 gram balanced which is better than the factory pulley.

 

What type of engine noise? Moving metal parts? Exhaust? I can't comprehend that. I'm sure you're right, but please explain? Examples are always good.

Would you be talking about the noise the pulley itself makes? Cause it doesn't look like one solid piece. Kinda put together at the rubber ring. If this is the case then there is no big deal going to the UR pulley cause it is one solid part.

 

I don't know what engine noise there is that the crank would need to absorb. Please explain??

 

I just did the pulley this past weekend and it really does make a difference. The car idles much smoother and quieter at highway speeds. No vibration at all. The weight savings is crazy!! Very happy with the way it turned out. I had the whole set on my previous car. I am thinking about getting one to go on the wifes MDX to help with fuel.

 

Read:

http://en.wikipedia.org/wiki/Noise,_..._and_Harshness

 

You are not going to notice engine vibration in the cabin. How is it quitier at highway speeds that just doesnt make any sense. Especially since the rubber ring is so called only for engine noise.

 

I dont see how that answers my question. It talks about NVH it has nothing to do with the actual damper. Well everybody is going to believe what they want to believe. Call Justice racing engines he can explain it for you. He specializes in Honda / Acura motors.

 

The rubber insert interupts and/or absors noise and/or normal engine vibartion. Not tuned/resonant internal/crankshaft vibration as has been mentioned above, since the engine is internally balanced.

In a way it acts similar to the rubber part of the engine mounts.

It's obvious that the amount of noise/vibration reduction provided by the OE partsis minimal. After removal no one ever complains (or as far as I know) even notices increased noise or vibration.

There was a good article posted here sometime back on the difference between hamonic vibration (resonance) dampning and noise/vibration dampning. They are not the same thing.


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Ok thanks bearcat. I know people have had good luck with them, but then the people who build motors steer me away and I have seen some pretty major problems very soon after an aftermarket pulley has been installed on several occasions. Mostly they are modified motors. I am planning on S/C my type s. I'm getting everything inline right now before I do. Thanks for everybodys help!!