InfinitiTech,

Those that have met you or read your previous posts know who is right here. THose with any gray matter left know what you meant with your posts and really value your response, believe me. I am very glad for waiting on the crank pulley - as enticing as the relatively cheap HP gain sounds. There are always going to be a$$holes and imbaciles on ANY forum, so do not let that dissuade you from continueing to be one of the most valuable contributors on this forum.

Thanks again.

Gurgen

<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/04/04 10:26 AM.</EM></FONT></P>

 

Again people, I am not dictating the law here just providing information so you all can make up your own minds.....

Infiniti Gearhead

 

Appreciated.

03.5 5AT-S (Black-Willow-Premium-Sport-Aero-GroundingGear™-Silverstars-PIAA-PopCharger-Z Tube-Tint-Stillen Dual Exhaust)

 

"AL503, are you still keeping your pulley on?"

Yeah. I'm keeping it on. Not enough evidence for me to act upon.

 

Info is good. People make educated buying decisions based on factual evidence. I had an underdrive pulley on my 330 and never once had any problems. Will I have problems on this car. Who knows. But the real matter that everyone needs to consider...InfinitiTech is ONLY stating what HE knows. No one is paying him, or holding a gun to his head. Thanks.

 

your maturity is is almost impressive as your ability to jump on the bandwagon. I was hard on this guy as we've developed a history in the hyperground thread but most of you have assumed a correlation from a suggestion that could most likely never even be proven by a team of PHD's and statsticians. IF you are worried dont buy it but don't flame me for calling this for what it is - speculation. Nothing can be proven yet so the attempts to be right shouldn't outweight the benefit of questioning the source and the claims that were made to me during a flame war by Infinititech. But if you insist flame on and be childish. Anyone who comes in here and blasts people for selling and also providing valuable information like he did in the hyperground thread are not exactly credible to me but if you missed that then enjoy the controversey for what it is and try not to revert to name calling - it's an even lower level than I stooped to already and not really neccessary.

2003.5 DP 5AT Sedan (E-thing but Nav)
14.2 @ 97.18
Injen CAI
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Polk ex-3500 Tweeter Upgrade/Shock Sensor/H-Liner Under Hood
<P ID="edit"><FONT class="small"><EM>Edited by SixFive on 05/04/04 01:14 PM.</EM></FONT></P>

 

Dang, thanks man. Didnt know so many people would have issues regarding this

Infiniti Gearhead

 

what worries me is that they took the pulley, installed it on another car, and noticed far more vibration. One would dream to have more studies that are so well controlled, a before and after experiment with objective measurements ofthe outcome... This sgure convinced me.

Gurgen

 

Amen cliverman. Post on InfinitTech. InfinitTech, while I've got your attention, how important is it for me to install a Crawford plenum with a torquewrench. Should I spring $20 for the wrench or just tighten until I see gasket squeeze out?

2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way

 

Honestly i would tighten it by hand that will be sufficient. Usually if you see the gasket coming out the sides it is already cracked.....Thank you for all the support guys.

Infiniti Gearhead

 

My hands are very weak. Torque wrench it is! Thanks bro.

2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way

 

Sixfive,

What is your professional background? Student? Architect? Doctor? Lawyer? etc... I'm only asking because we are discussing a technical PHYSICS problem and you only post subjection (the world revolves around "ME" philosophy). Your argument stems from some deep seeded resentment against InfinitiTech, and you assume he is making something up to go after YOU.

FYI, I am in the process of designing a zoom mechanism that has 2 motors, 2 potentiometers, 4 radial bearings, 8 linear bearings and I know a thing or two about inertia, torque and mass unbalance. If the pulley is not balanced about its rotational center and it is not "co-axial" with the cranks rotational center, you will have a rotational mass unbalance. This WILL cause harmonics that will eventually kill bearings.

You are confident that your point is the right one (and it may be in this case) but what do YOU bring to the table to back up your philosophy.

You talk about "drinking (or not drinking) the kool-aid on another forum, well are you basing your facts on your own knowledge or opinions of Maxima owners? Are you drinking the kool-aid yourself?

Sincerely,
Neffster, BSME
Sr. Research Engineer
Precision Mechanical Design
Lockheed Martin Missiles & Fire Control - Orlando, FL

300bhp??? We'll see... 5-22-2004

 

infinititech,
I was just curious as to what extent the test you conducted on the pulleys went? Just to say before anyone or you take offense...I am asking only for information, not to question anyone or incite some more flames. Anyway, here are a few questions I have about the 2 pulley incidents you've talked about. What kind of pulleys were they? I know you said you conducted a test with the pulley in question on another vehicle and there was excessive vibration, with that said could it have been a defective/low quality pulley in the first place? Did you take any known good pulleys and conduct the same test with the same results? Perhaps, on the car that had the stripped bolt on the oem pulley never had an aftermarket pulley, and the owner just f'd it up by trying to take it off and stopped when it stripped and in doing so caused some sort of damage. Do you know for sure he did use an aftermarket pulley and if so what kind?
I don't know much about the pulleys themselves but it just sounded like not enough extensive testing was done on these two particular cases...maybe there has been and you just didn't communicate that to us. If you could that would be helpful and I'm sure it would satisfy a lot of curiousity for others and myself.
Now regarding another aspect of my reluctance of believing everything I read.
"two problems which your dealership's service department has never heard of by the way!"
What did this statement made by Sixfive mean? Did he call your dealership and they said they never heard of the problem?
You also said they both came in "last week" and then you said they were months apart "maybe"...can you explain the discrepancy here?
One more thing that I often wonder about when accepting the credibility of anything I read on these forums is in this case...You said you knew that the car you looked at had an aftermarket pulley, well aren't you obligated to note anything suspicious regarding the warranty? This to me seems a little unethical and disloyal to the company that issues your checks. And on top of that you accepted a case of wine, I find it hard to take someones word that would act in such a way to a company they've been working for for 13 years.
This to me puts your credibility in check.
Just to let you know, I do not have any interest in installing a pulley I just enjoy learning different things about my car, so I can really care less if they do or do not cause damage. I just think that your posts could be misleading and biased due to not conveying enough information for these people to make educated guesses with.
Right now I just think there is too much missing information for anyone to jump to conclusions, and maybe you could shed a little more light by giving more facts.
I just wanted to end that all I'm doing is asking questions about some of my observations on this whole post...I'm not trying to prove you wrong just trying to get more information and a little better feeling about the source we're getting this info. from. Hopefully you can answer some more questions, and I thank you for your time.

 

While he may not come across well all the time, he has a point.

A properly installed pulley from a reputable dealer should not cause a problem on this engine.

If it does, I'd like to know why. There is probably more imbalance caused by the belt than the pulley. We're only talking 6K rpm here, not 66K.

2004 G35C 6MT Black. Yes Honey, I promise no mods. I love it just the way it is.

 

For the sake of argument, who's to say that the aftermarket is not better for the engine than the stock? Perhaps a lighter pulley will actually balance the crank better than the stock pulley.

Speculation aside, if you physically look at the two pulleys, there would be no contest in terms of quality of materials and the manufacturing procedures used to make them. The stock pulley looks like it was made to the quality control standards of a farming implement (I'm exagerrating a little here of course) whereas the UR pulley looks like it was created with extreme precision via milling. What kind of metal did they use to cast the stock pulley? Was it a mixture of different metals or was it all one type of metal? To what level of QC were they manufactured? Did they make sure it was completely balanced or did they just weigh it to make sure that it was within certain tolerances. Being in the metal fabrication business, I'd take a part that was precision milled out of a block of pure metal (aluminum in this case) v. the inarguably less precise casting method using who knows what for base metal.

In addition, the stock pulley has a rubber ring around it. How is that ring attached? Is it attached with some kind of adhesive and was that adhesive applied uniformly or not? If it is held in their by it's own size (squished in the ring), was it forced in uniformly or are there places where the ring is more compressed than others that could lead to an imbalance? Regardless, anytime you have more than 1 type of material, there is a greater possibility of an imbalance.

I guess my point is that the aftermarket pulley might be better for the engine than the stock pulley much the same way the crawford/kinetix plenum lets the two front intake runners breath better than the stock plenum.

On an entirely different note, how does the extra weight of the stock pulley even matter significantly enough to make a difference? If there was nothing attached to the pulley, I could see a longitudinal balance argument but this is not the case.

Then there is the vibration argument. Again, if the nothing was attached to the pulley, I would be more accepting of this argument. However, there are 2 belts attached to the crank pulley and both of them are at a fairly high tension. Wouldn't this tension be more than enough to offset any additional damping due to the extra weight of the stock pulley? Could we just make sure that the tension of the belt was (hypothetically) a couple lbs. (or whatever it would be) greater to compensate for the UR's lighter mass?

Unlike neff and the other engineers, my political science and psychology (I know why republicans are the way they are and the reason for this dementia :-) )degrees along with my law degree are ill-suited for this kind of discussion. However, I think my observations/arguments have some merit. Can anyone confirm or repudiate them?