Serpentine belt screech on DECEL: Try a BIGGER pulley ?
11-07-2017, 07:02 PM
#1
TECH Apprentice
Thread Starter
Serpentine belt screech on DECEL: Try a BIGGER pulley ?
2002 Tahoe, has consistent audible belt squeal during high speed 1-2 shift, or closed throttle at high rpm. I am fairly sure it is the Alternator overrunning the belt.
. With stock pulleys, the Alternator can maintain 110 Amps output at idle. Has anybody upsized the Alternator pulley, to A: Reduce belt load, B: Additional belt traction, and C: reduce parasitic / and inertial load ?
My current stock Alt pulley is 2.2 inch diameter.
I have available a 2.6" pulley to try, should slow the rotor speed by a couple thousand RPM.
.
I do not think we have a belt tensioner problem, as boost is maintained 174 KPa all the way up over 6200 rpm.
. With stock pulleys, the Alternator can maintain 110 Amps output at idle. Has anybody upsized the Alternator pulley, to A: Reduce belt load, B: Additional belt traction, and C: reduce parasitic / and inertial load ?
My current stock Alt pulley is 2.2 inch diameter.
I have available a 2.6" pulley to try, should slow the rotor speed by a couple thousand RPM.
.
I do not think we have a belt tensioner problem, as boost is maintained 174 KPa all the way up over 6200 rpm.
11-07-2017, 09:05 PM
#2
2002 Tahoe, has consistent audible belt squeal during high speed 1-2 shift, or closed throttle at high rpm. I am fairly sure it is the Alternator overrunning the belt.
. With stock pulleys, the Alternator can maintain 110 Amps output at idle. Has anybody upsized the Alternator pulley, to A: Reduce belt load, B: Additional belt traction, and C: reduce parasitic / and inertial load ?
My current stock Alt pulley is 2.2 inch diameter.
I have available a 2.6" pulley to try, should slow the rotor speed by a couple thousand RPM.
.
I do not think we have a belt tensioner problem, as boost is maintained 174 KPa all the way up over 6200 rpm.
. With stock pulleys, the Alternator can maintain 110 Amps output at idle. Has anybody upsized the Alternator pulley, to A: Reduce belt load, B: Additional belt traction, and C: reduce parasitic / and inertial load ?
My current stock Alt pulley is 2.2 inch diameter.
I have available a 2.6" pulley to try, should slow the rotor speed by a couple thousand RPM.
.
I do not think we have a belt tensioner problem, as boost is maintained 174 KPa all the way up over 6200 rpm.
11-20-2017, 12:28 AM
#3
TECH Apprentice
Thread Starter
Yes. Crank pulley is pinned.
Installed the 2.6" diameter alternator pulley, turned on all the lights, heaters, seats...
Alternator throws down solid 110 amps at hot idle.. No Problem.
.. Did not hear any belt screaching, but I did not run over 4000 rpm.
Installed the 2.6" diameter alternator pulley, turned on all the lights, heaters, seats...
Alternator throws down solid 110 amps at hot idle.. No Problem.
.. Did not hear any belt screaching, but I did not run over 4000 rpm.
