SP & GM motor timing question
#1
SP & GM motor timing question
Hi,
The SP motors come with adjustable timing 0 - 10 deg with the middle setting being 5 deg so does that mean my GM with fixed timing has 5 deg ? if not how much timing does it have ? I don't understand how different manufacturers timing work on their motors, is there a standard amount of timing they all have ?
Thanks.
The SP motors come with adjustable timing 0 - 10 deg with the middle setting being 5 deg so does that mean my GM with fixed timing has 5 deg ? if not how much timing does it have ? I don't understand how different manufacturers timing work on their motors, is there a standard amount of timing they all have ?
Thanks.
#2
I do not know how the GM is measured, but I do know how the SP v3 is measured.
First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.
Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.
One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.
For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.
Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.
One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.
For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
#3
Thankyou.
#4
Tech Addict
#5
Tech Adept
I do not know how the GM is measured, but I do know how the SP v3 is measured.
First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.
Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.
One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.
For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.
Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.
One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.
For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
I have run the SP 4,5 with GM 75 speedo in my Top Rebel , and had a massive improvement , by turning the mecanical timing all the way down on the SP and then give it 3-5 degress more in the speedo. Someway the engines run more smooth with less mecanical timing