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#101
02-25-2016, 05:14 PM
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.763 is way too much. Can you figure out what the short base is, if the long base is .47"? Do the numbers calculate out close for the newer belt at .44", .30" and .30"?
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#102
02-25-2016, 06:01 PM
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My figure/answer was wrong.
I didn't figure the angle right on one of the triangles.  I got .4936898" With the 36º angle of the belt (if that is correct angle? it's what I'm basing this on) add this to whatever the smaller parallel (short base) dimension is: .24368978 (short base is .250 in diagram you made) 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#103
02-25-2016, 06:07 PM
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Quote:
Slanted sides? 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#104
02-25-2016, 07:25 PM
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Short base and altitude (height).
The .49" is close enough, because the .25" number was probably a little off I'm sure. I have to believe the 3/8" number Quanta was referring to was the height of the belt, not the width at the top of the belt, which is what this exercise was about. |
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#105
02-25-2016, 07:41 PM
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That could be.
Would make the belt a 'half inch' wide belt probably.
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#106
02-25-2016, 08:15 PM
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I believe they called it 1/2" in the catalog, when it was really .47". Then they started calling them 7/16" when the .44" came out.
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#107
02-27-2016, 03:59 PM
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Well, that was kind of surprising.
I would have thought the '75 MVMA (the new name for the AMA) still showed the earlier values. 1976 was the first year it showed the newer values. |
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#108
03-05-2016, 12:31 AM
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I haven't logged on here in a while, but if anyone is interested in a Genuine GM 478012 I have one left. The part number is molded into the belt, too, not ink stamped on it. It reads GM 478012 PQ and then a tiny Gates stamp inside of the oval. This is the belt that runs the A/C compressor.
  .
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1966 Ford F250 Deluxe Camper Special Ranger Custom Paint - San Jose plant http://www.ford-trucks.com/forums/12...al-ranger.html 1966 Ford F250 4x4 Red/White 4-speed - San Jose plant 1966 Ford F250 4x4 White 4-speed - San Jose plant http://www.ford-trucks.com/forums/11...-f250-4x4.html 1971 Trans Am White/Blue 4-speed limited options - Norwood plant http://forums.maxperformanceinc.com/...d.php?t=757496 |
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#109
03-05-2016, 08:10 AM
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PM sent, I could use it
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#110
03-11-2016, 04:02 PM
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I found this which looks like it's from a 1972 manual.
Also, here is a link to the Grand Prix Chapter of POCI page which has information on PONTIAC TIMING COVERS, PULLEYS, & ACC BRACKETS as well as sheets from manuals specifically for belts and pulleys for 64 - 71 Pontiacs. http://grandprixchapterofamerica.com...-acc-brackets/ 
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#111
04-06-2016, 12:12 AM
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I want to thank Pepi (Karl) for a fantastic bearing replacement job on my sealed idler pulley. Quick turnaround and it now runs silent! And a very reasonable price too. Thanks Karl!
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#112
04-06-2016, 07:20 AM
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Can you post a picture of the finished product?
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#113
04-06-2016, 10:11 PM
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You are welcome Brad, glad you are happy with it. It will last a lot longer than original I used sealed bearings on both sides not just the one side, keeps the grease from slinging out into the pulley. That is why I personally think the originals go bad, slings the grease and then the bearing runs dry.
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1973 Formula 400 4 spd 04C build date Norwood assembly plant. |
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#114
11-23-2016, 11:19 AM
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To add some info to this 80 amp thread I am attaching the photos of the original A/C and PS belts that are on my 80 amp alternator equipped 73 SD. I still need to find an original alternator belt for the car.
I crawled around the car today and discovered that I had two of the three original belts on the car, and not just one. So what I need is the 80 amp alternator belt if anyone can assist. Here are the photos of the original AC belt and the original power steering belt. 478012 is the A/C belt with a WH and V2K code 483133 is the PS belt with a N9 and V2 code and the aftermarket 80 amp alternator belt just for length info (15515 -1193 12)   
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#115
11-24-2016, 10:28 PM
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And here are the corresponding pages from the 1973 catalog for the various belts:
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#116
09-04-2017, 09:31 AM
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I'm trying to get the belts gathered up for the Black Car. I understand that Quanta doesn't make a correctly coded belt for the Alt or PS applications, but has anyone checked to see if they have belts of the correct length and width for these applications? I'm thinking if I have to have a non-original GM belt, I would at least like it to look appropriate.
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#117
09-06-2017, 01:53 PM
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Talked with Craig at Quanta. Not very helpful. He says they have no belts between 50" and 52.25" regardless of PN or date code.
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#118
09-10-2017, 03:09 PM
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Bob, so the manufacturer of these belts have no way of making them for us, as I'm sure Quanta is just the marketer?
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#119
09-10-2017, 08:44 PM
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I have bought replacements from NAPA in the past when I had the 80 amp system on a 72. I believe I have an original that got cut with side cutters ( not by me) . The Napa belts could have been Gates and made in Canada .
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#120
09-10-2017, 10:03 PM
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HFR - I'm sure the manufacturer could make whatever length belt he was asked to make. Craig at Quanta, however, had no interest in having them make any belts beyond those that he currently carries. It's a shame everyone has such apathy. Just like trying to get the correct glovebox tire sticker. Most folks could care less. Makes you wonder how they ever started a business.
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