DO NOT! I REPEAT DO NOT!!!!!BUY AFTERMARKET UNDERDRIVE PULLEYS!!!!!!!!
#1
DO NOT! I REPEAT DO NOT!!!!!BUY AFTERMARKET UNDERDRIVE PULLEYS!!!!!!!!
So i after i got the pulley, had to get new belts....got it installed..it ran....no gains whatsoever. just metal and shiny. it made my tensioner go bad. replaced the tensioner... 3 days ago i start the car it starts sounding funky....like when u clip a baseball card to the back of ur bicycle. Frustrated as can be "1 injector went bad last week..." I try looking to see whats wrong with it.......lift the car up....take the wheel off....the shields...and i see that my MotherF*****G pulley is cracked! so i ask for advice on what to do....only thing i can do really is replace it. So i found my oem one and got a belt for it....loosened up the idler pulley...turned the tensioner..... finally got 1 belt off.....then after struggling to get teh underdrive pulley bolt off....i got someone to come with an airgun to take it off.....the freaking pulley just fell off! On a worse note...the freaking center part of the pulley is jammed onto my crankshaft....and i cant get it off now...i tried to take a visegrip and then screwdriver behind it to pry it off....didnt work...feels almost as if its welded togehter...no play at all.....i dont know what to do anymore im soo FRUSTRATED!!!
Here is a picture of the pulley....
Here is a picture of the pulley....
#5
That is going to be a tough one to take out,can you post the pics so we all can see what can be done hear. I would try to pry the damn thing with something tall and skinny to fit in there so you can try to wrench it out.
#6
is the bolt out of it... if so you could try and use some heat to get it off thats if you have access to a torch sometimes we have to use torches to get stuck stuff like that off at the shop i work at..
#10
ok so i tried puttin vise grips on it and then prying it off with a screwdriver.....i think im going to have to cut into it........and take it off that way..no other choice...=/ i just need to get it to run bc im going 3.5 in the next month or 2.
#15
I am curious, what exactly is a harmonic balancer and how is it integrated into the stock pulley? Are there any serious adverse effects on the engine from not having a harmonic balancer?
#16
Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in synch with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure.
To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft. The damper is composed of two elements: a mass and an energy dissipating element. The mass resists the acceleration of the vibration and the energy dissipating (rubber/clutch/fluid) element absorbs the vibrations.
#17
I BELIEVE THE OEM ONE SAYS THAT IT REQUIRES YOU TO HAVE RUBBER ON THE PULLEY. THE AFTERMARKET ONES DONT....
i just realized that was all in caps lol. sorry i don wna retype it.
but...im gonna figure it out when i get the chance...for now im driving my bucket 4th gen lol
also..for those who say theyve had the pulley...was there a gain? doubt its a noticable one...thats it for now..gonna post up with updates 2m.
i just realized that was all in caps lol. sorry i don wna retype it.
but...im gonna figure it out when i get the chance...for now im driving my bucket 4th gen lol
also..for those who say theyve had the pulley...was there a gain? doubt its a noticable one...thats it for now..gonna post up with updates 2m.
Last edited by The Russian; 11-15-2008 at 12:14 AM.
#19
yeah man i would go that far saying underdrive pulleys are bad..i had a obx one and didnt have a problem with it at all..i think u just had sum bad like with that one man..it happens.sorry to hear about it...nothing like a bunch of car trouble lol SOO FRUSTRATING!!!
#21
#22
im honestly not sure. someone sold it to me....all im saying is....DON't BUY THEM THEY DONT MAKE ANY DIFFERENCE AND ITS JUST A HEADACHE TO GET TO IT AND THE WHOLE DEAL........
this is not for the sc'd folks i dont know if it makes a bigger diff for y'all.
this is not for the sc'd folks i dont know if it makes a bigger diff for y'all.
#24
I dont care how many people say theirs have not failed. I have seen enough of threads about these failing and breaking to never ever bother buying one for what tiny gain they provide. The lightweight flywheel will be plenty fine for me.
#26
I have the UR LIGHTWEIGHT Crank Pulley.. NOT the underdrive. I got it simply because I was installing the MEVI, and thought that the pulley would make up for the slight loss in mid-range power that I was going to suffer with the MEVI. I was NOT impressed. I did not notice ANY sort of gain with it, although I havent had any problems with it either. I definately wouldnt go recommending them if you are looking for an actual gain! Now I'm crossing my fingers!
#27
http://www.atiperformanceproducts.co...mper_dinan.htm
This has been discussed many times before in regards to our cars and the pullies.
http://forums.maxima.org/140640-post3.html
http://forums.maxima.org/3515625-post24.html
http://forums.maxima.org/2907485-post10.html
http://forums.maxima.org/4381913-post24.html
However many have run the UR UDP for years without any issues to the crank from torsional vibration.
Im not sure who you were refering to having their UR UDP fail on them, Ive never seen or heard about one doing so. Maybe you can find that thread.
I do know that the issues people have had with the other UDPs were all cheaper knock offs, RVM, Motostorm, etc..
#28
if your motor aint blue printed and balanced i would have to say so...
Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in synch with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure.
To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft. The damper is composed of two elements: a mass and an energy dissipating element. The mass resists the acceleration of the vibration and the energy dissipating (rubber/clutch/fluid) element absorbs the vibrations.
Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in synch with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure.
To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft. The damper is composed of two elements: a mass and an energy dissipating element. The mass resists the acceleration of the vibration and the energy dissipating (rubber/clutch/fluid) element absorbs the vibrations.
Only on some cars,moslty older. A lot of cars now are internally balanced at the crank.
#29
#31
#34
FleaBay Strikes Again, I would never purchase a mechanical part on that site. Speaking from Past experience. I found this on Unorthodox Racing's website I thought it backs their product with some interesting information. I've been running my UR Pulley for 30,ooo plus miles with no ill effects. Knock on wood!! :
http://www.unorthodoxracing.com/faq.aspx#section2
http://www.unorthodoxracing.com/faq.aspx#section2
#35
and believe it or not it felt like it added power!!! I couldnt believe how much faster the rpms jumped up... anyway...the car is running great again! =]
FleaBay Strikes Again, I would never purchase a mechanical part on that site. Speaking from Past experience. I found this on Unorthodox Racing's website I thought it backs their product with some interesting information. I've been running my UR Pulley for 30,ooo plus miles with no ill effects. Knock on wood!! :
http://www.unorthodoxracing.com/faq.aspx#section2
http://www.unorthodoxracing.com/faq.aspx#section2
fleabay...havnt heard that one b4 haha.
#39
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