who is running a underdrive pulley
03-31-2009, 09:03 PM
#2
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Join Date: 03-08-2008
Location: United States of Texas
Posts: 505
There have been several posts on this
There were several posts about the underdrive pulleys. The general consensus on our cars is it would not help much and may hurt it. Several reasons.
1. The lower pulley is also the harmonic balancer and it is never a good thing to eliminate the balancer. (The old stlye cars the pulley bolted onto the front of the balancer and were not one peice)
2. The fan and power steering is electric and the water pump is not driven off of the crank pulley, it is internal. So the only things ran by the pulleys is the airconditioner and alternator. I do not know that you want to slow those down or how much if any it would help you if you did.
The good news is GM did a pretty good job of designing the engine. The bad news is many of the things we used to do to increase mileage and performance have already been done so it is difficult to get improvements.
1. The lower pulley is also the harmonic balancer and it is never a good thing to eliminate the balancer. (The old stlye cars the pulley bolted onto the front of the balancer and were not one peice)
2. The fan and power steering is electric and the water pump is not driven off of the crank pulley, it is internal. So the only things ran by the pulleys is the airconditioner and alternator. I do not know that you want to slow those down or how much if any it would help you if you did.
The good news is GM did a pretty good job of designing the engine. The bad news is many of the things we used to do to increase mileage and performance have already been done so it is difficult to get improvements.
03-31-2009, 11:30 PM
#3
Senior Member
Thread Starter
Join Date: 06-19-2006
Location: orlando
Posts: 106
There were several posts about the underdrive pulleys. The general consensus on our cars is it would not help much and may hurt it. Several reasons.
1. The lower pulley is also the harmonic balanced and it is never a good thing to eliminate the balancer. (The old stlye cars the pulley bolted onto the front of the balancer and were not one peice)
2. The fan and power steering is electric and the water pump is not driven off of the crank pulley, it is internal. So the only things ran by the pulleys is the airconditioner and alternator. I do not know that you want to slow those down or how much if any it would help you if you did.
The good news is GM did a pretty good job of designing the engine. The bad news is many of the things we used to do to increase mileage and performance have already been done so it is difficult to get improvements.
1. The lower pulley is also the harmonic balanced and it is never a good thing to eliminate the balancer. (The old stlye cars the pulley bolted onto the front of the balancer and were not one peice)
2. The fan and power steering is electric and the water pump is not driven off of the crank pulley, it is internal. So the only things ran by the pulleys is the airconditioner and alternator. I do not know that you want to slow those down or how much if any it would help you if you did.
The good news is GM did a pretty good job of designing the engine. The bad news is many of the things we used to do to increase mileage and performance have already been done so it is difficult to get improvements.
04-01-2009, 02:58 PM
#5
Senior Member
Join Date: 06-04-2008
Location: Toledo, OH
Posts: 1,882
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AaronSS
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09-09-2008 09:16 PM