Lightweight pulley = bad bearings??
10-27-2008, 07:37 PM
#1
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Lightweight pulley = bad bearings??
i have an 08 TL (leased vehicle)
first question; will an underdrive pulley void my warranty?
anyway, i was speaking with a buddy of mine who seems to know a lot about engine dynamics and he was saying that a lightweight crank pulley will mess up the bearings in the long run because the crank pulley is harmonically balanced from stock to work with the rest of the pulleys. he said if you replace the crank pulley you need to replace the rest of the pulleys. that doesnt make sence to me.
i know the crank pulley is a harmonic balancer but i do not see how a same sized pulley with only less weight would throw off the engine balance. its not going to put more stress on other parts because its the same diameter, its only going to spin the other components up to a faster speed than it takes with the stock pulley.
has anyone heard of or had any issues with an underdrive/lightweight pulley causing the crank and or other pulley bearing to wear out pre-maturely?
i want to do this mod on my TL.
first question; will an underdrive pulley void my warranty?
anyway, i was speaking with a buddy of mine who seems to know a lot about engine dynamics and he was saying that a lightweight crank pulley will mess up the bearings in the long run because the crank pulley is harmonically balanced from stock to work with the rest of the pulleys. he said if you replace the crank pulley you need to replace the rest of the pulleys. that doesnt make sence to me.
i know the crank pulley is a harmonic balancer but i do not see how a same sized pulley with only less weight would throw off the engine balance. its not going to put more stress on other parts because its the same diameter, its only going to spin the other components up to a faster speed than it takes with the stock pulley.
has anyone heard of or had any issues with an underdrive/lightweight pulley causing the crank and or other pulley bearing to wear out pre-maturely?
i want to do this mod on my TL.
10-27-2008, 08:27 PM
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thanks for the info though, im doing the swap soon then.
10-27-2008, 08:29 PM
#6
you are aware: more than 3 months membership--- and we get to really razz those who make no effort at search and start new threads!
Unless your friend is an acura tech or well known member of azine, what makes you think they know more about the car,,, than those of us who actually own one!
Unless your friend is an acura tech or well known member of azine, what makes you think they know more about the car,,, than those of us who actually own one!
10-27-2008, 08:29 PM
#7
right= no post on bearing issue because we dont have one
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10-28-2008, 03:34 AM
#10
I have no problem with asking questions, just that members who have been here more than a few months should be able to find this info in the threads
And I personally-- am tired of threads where `friends at work`- who dont own acuras- giving bad info,,, then we get to correct it
If you want acura info- come to where acura owners hang out first!
And I personally-- am tired of threads where `friends at work`- who dont own acuras- giving bad info,,, then we get to correct it
If you want acura info- come to where acura owners hang out first!
10-28-2008, 05:48 PM
#16
Since this thread is right here i might as well post my noob pulley question here also...
Does the underdrive pulley make the a/c less effective both at highway speeds and at idle?
Since it cuts power to the accessories 15% does this mean i can't play my stereo with the car off as long as before?
Does the underdrive pulley make the a/c less effective both at highway speeds and at idle?
Since it cuts power to the accessories 15% does this mean i can't play my stereo with the car off as long as before?
10-28-2008, 06:11 PM
#17
I have no problem with asking questions, just that members who have been here more than a few months should be able to find this info in the threads
And I personally-- am tired of threads where `friends at work`- who dont own acuras- giving bad info,,, then we get to correct it
If you want acura info- come to where acura owners hang out first!
And I personally-- am tired of threads where `friends at work`- who dont own acuras- giving bad info,,, then we get to correct it
If you want acura info- come to where acura owners hang out first!
As for the OP....dude...its not that big of a deal on the Honda/Acura engine for the already above stated reasons. Dont worry about it...you are good to go!
10-29-2008, 05:49 PM
#18
luvs redheads!
the real deal
most modern engines are internally balanced on the crank. Since i have built two acura v6 motors and have used lightweight pullies and an underdrive pulley here are my thoughts:
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
10-29-2008, 07:14 PM
#19
most modern engines are internally balanced on the crank. Since i have built two acura v6 motors and have used lightweight pullies and an underdrive pulley here are my thoughts:
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
I would like to see these dynos showing a hp/tq loss b/c every dyno I have ever seen on these pulleys has not shown a loss. It's equivalent to doing a lightweight flywheel; you're not going to lose hp/tq.
10-29-2008, 07:17 PM
#20
Saying a light weight crank pulley is going to adversely effect engine life on a HONDA engine is like saying you can get a skin cancer from prolonged exposure to a full moon.
Sure, you are getting some UV, but it is not enough to really cause an issue.
Sure, you are getting some UV, but it is not enough to really cause an issue.
10-29-2008, 08:32 PM
#21
Three Wheelin'
most modern engines are internally balanced on the crank. Since i have built two acura v6 motors and have used lightweight pullies and an underdrive pulley here are my thoughts:
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
A crank pulley weights how much again on theses engines 10lbs-15lbs?? cast right? now if you look at them they should have tiny dimples drilled into the outer face to BALANCE the pulley it self. Now you remove this heavy pulley on the end of your crankshaft...it makes a difference. Hence why i dont even use Underdrive pulleys, rather i use lighter ones.
The reason?
I experienced SEVERE loss of power/tq in the upper rpm band lowering my overall time in the 1/4. This was an aluminum pulley that weighed 1.5lbs VS the stock 10lbs plus. It was TOO light! Now on legend motors we run 3.5lb crank pulleys.
Now also, you take off your stock heavy A$$ stock pulley and put a NON-BALANCED lighter pulley it WILL have an effect. Your engine is balanced from the factory and SHOULD take in account these things when built; crank pully, crank, rods, pistons, flywheel. You change these you upset the balance plain and simple.
Will it hurt your motor to change the pulley? It will decrease the longevity of the motor but not by much. You should still get 150k miles
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