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Re: Quanta Belt Quandary
Hi Anthony:
I've had problems with the Quanta belts tossing at 4000+ RPM on my 67 327/300 with A/C and power steering. I have not had time to fully investigate the problem, but one of my theories is that the Quanta belts may be prone to this, expecially the long A/C belt. I'd love to hear if others on this discussion board have had good results with the Quanta belts at high RPM.
My first experiment was to switch to Gates belts on the alternator and power steering, and no belt at all on the A/C. That holds up fine at high RPM, but I have not yet tried adding a Gates A/C belt. I'm also looking into converting to the "deep groove" pulleys used on the L79, but that turns out to be a complicated problem because the deep groove pulleys do not line up properly on an A/C car.
In my research on this problem many people have emphasized that mis-alignment of the pulleys can cause belts to come off. The alignment on my pulleys *looks* fine, but I plan to do some detailed measurements to check it more carefully.
Also, many people say that one a belt has come off, it may be distorted and should not be reused.
Lastly, regarding your experience with the alternator belt stretching to the end of the adjustment range, I had this problem too with two successive Quanta alternator belts of the correct part number. I called Quanta and they were very helpful in identifying a slightly shorter belt with similar construction. The best fit was with a belt that was only one inch shorter than the "correct" belt. I was surprised that such a small change in the length of the belt had such a large effect on the position of the alternator adjustment.
Hi Anthony:
I've had problems with the Quanta belts tossing at 4000+ RPM on my 67 327/300 with A/C and power steering. I have not had time to fully investigate the problem, but one of my theories is that the Quanta belts may be prone to this, expecially the long A/C belt. I'd love to hear if others on this discussion board have had good results with the Quanta belts at high RPM.
My first experiment was to switch to Gates belts on the alternator and power steering, and no belt at all on the A/C. That holds up fine at high RPM, but I have not yet tried adding a Gates A/C belt. I'm also looking into converting to the "deep groove" pulleys used on the L79, but that turns out to be a complicated problem because the deep groove pulleys do not line up properly on an A/C car.
In my research on this problem many people have emphasized that mis-alignment of the pulleys can cause belts to come off. The alignment on my pulleys *looks* fine, but I plan to do some detailed measurements to check it more carefully.
Also, many people say that one a belt has come off, it may be distorted and should not be reused.
Lastly, regarding your experience with the alternator belt stretching to the end of the adjustment range, I had this problem too with two successive Quanta alternator belts of the correct part number. I called Quanta and they were very helpful in identifying a slightly shorter belt with similar construction. The best fit was with a belt that was only one inch shorter than the "correct" belt. I was surprised that such a small change in the length of the belt had such a large effect on the position of the alternator adjustment.
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