When I replaced the pulley on my 240sx, ASP pulley weighted 4 times less that stock and it did make a noticeable diference, especially down low. Now what I've heard here before about pulleys for VQ is that they are only 20% lighter than stock, so I think effect will be not as noticeable. That could be the reason behind their low popularity.

***04 G35s 5AT/Sport***
***04 Volvo XC90 T6***

 

I know, i know....I was just kidding....I know they have sponsors. That's why I did a "lol" after my statement.

doc

 

Ask these guys if they've actually seen an engine failure attributed to a pulley and how they attrubute...

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

I did.

They did.

Belt harmonics transmitted to the crankshaft by pulleys without dampeners.

Perhaps having the last word is of greater value than an engine.

People act on what they believe to be true.

 

I'm not sure of the exact weights but the ur pulley is around 6 lbs. lighter than the stock pulley which is around ~9? lbs. The 20 you're thinking about is the size of the pulley. It underdrives the accessories belt by about 20%.

 

Do the pulleys included with FI kits have a 'dampener?'

If not, then they will all go boom (and much faster than those of us without FI) if those techs are correct.

 

that accurately describes what most people who say they fail do - try to get the last word.

Lets see plenty of people have pulleys with oil anaylsis and no negative affects. And there are those who claim correlation and causation without positive confirmation. Neither proove anything but those who have no confirmation other than theory should be less adamant. YOU don't even have them and you have nothing theory.

All the dampner issues and harmonics are covered several months ago and the smart money shows nada for eveidence there is a problem with AN INTERNALLY BALANCED MOTOR. Read up and try not be right over being bitter you don't have one of the best bangs for bucks mods out there because you cling to unproven hogwash..cheers

Then no one has presented a case with an actual attributed failure. Get some facts - bring them on board and show some money. No one has ever presented this with factual support so you'd be the most popular guy in 25 sites if you could find proof that substantially shows CAUSATION. Not some mechinc with a theory - actual evidence. Dealers spew about mods all the time. Remember Infiniti Tech - he admitted there was only theroy behind his assertion as there was only evidence of the results and no casuation was established by the dealer as I remember his own words.

There folks who have them and no problem

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

6-5,

Do you know if the <blockquote><font class="small">In reply to:</font><hr>

INTERNALLY BALANCED MOTOR

<hr></blockquote> is balanced with the pulley on the shaft? Why do they have a rubber ring on the stock pulley? Do you know how much "inconsistancy" a 0.040" Profile Tolerance can have on a 9 pound cast pulley?

<font color=blue>The above statements are only my take on the issue. If you disagree with anything I typed then you are 100% right!</font color=blue>

 

The rubber ring (according to some) is for belt noise issues. If the rubber ring went all the way through the pulley, then it would be a different story. Having a thin rubber insert glued onto a cast iron pulley isn't going to do much more than tame some belt noise. Impurities/heterogeneity of the iron and casting process will probably have more of an effect than the rubber will.

Anyone want to field my FI pulley question?

Here's a link to my Blackstone lab report after some very hard running. Lead levels are below average. http://www.g-owners.com/pic_display.asp?id=695<P ID="edit"><FONT class="small"><EM>Edited by al503 on 09/07/04 10:19 AM.</EM></FONT></P>

 

so what are the best ways to see if the pulleys are negatively affecting your engine? what to look for in the blackstone analysis?

G35s6mt/TSecu/350Z Springs&Struts/K&Nfilter+Z-tube/StillenDualExhaust /6WireGroundKit/KinetixHighFlow

 

apparently, wear to the bearings is the major concern, which will be shown by the lead levels.

 

The maxima owners are gods on this subject for those who would like more information on this mod. I wouldn't recommend this mod if your a second guesser or worry alot as there is a lot of both information and misinformation out there ala the rubber piece. Also this was debated at a lower level of sanity on my350.

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

...interesting that we have sparked up this debate again huh? Theory vs. Blackstone analysis concrete evidence..... what to believe, what to believe....

This is why I enjoy reading this forum, I learn alot.

Can we contact someone from Infiniti higher-ups to know exactly what the rubber ring does for sure to end all the speculation?

doc

 

my 350 has gone over this well i believe - been a while. Nissan is a better source I'd think

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

6-5,
I agree with what you are saying on the lack of any reliable or factual proof that the ur pulley cause engine failures.
On the other side of the coin there is no proof that they don't cause these failures in rare cases. I think that is why so many people like myself are still on the fence.
My understanding is that the rubber ring is not a harmonic balancer but simply a vibration dampner. The much heavier rubber ring equiped oem pully will dampen vibrations, comming from the belts, much better than the light weight ur pulley.