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03-28-2020, 11:51 PM | #1 |
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Join Date: May 2010
Location: Michigan
Posts: 464
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49 vs 50 car water pumps
Was there a reason ford switched to a narrow belt. Is one better than the other. I have a 49 coupe with no engine. I have an 8ba block and a narrow crank pulley and fan but no water pumps. If I go with a wide belt I need everything. Not sure what route to go
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03-29-2020, 12:38 AM | #2 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,302
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Re: 49 vs 50 car water pumps
I have an 8BA with trock pumps and one wide belt and another with the two narrow belts. I prefer the narrow belts. I can't quite put my finger on why, but I have a gut feeling the single belt is too big and bulky. I also like that the two belts give you a bit of redundancy. If you lose one narrow belt, you just may be able to limp it a little further along, Although I've never had the occasion to go part hunting. I think that the narrow belt components might be a bit easier to find, because they were used for 4 years rather than just one.
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03-29-2020, 09:22 AM | #3 |
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Location: san antonio, texas
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Re: 49 vs 50 car water pumps
totally agree with the 2 belt redundancy statement.
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03-29-2020, 09:41 AM | #4 |
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Location: Granger (Northern) Indiana
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Re: 49 vs 50 car water pumps
I think the switch to two narrow belts in '50 was to allow more fan and/or generator rpm adjustment, with each having it's own belt and drive pulley ratio.
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03-29-2020, 10:11 AM | #5 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
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Re: 49 vs 50 car water pumps
Damn, Bob, you have a way of getting just a bit deeper into this than most. I hadn't thought of that, but it makes perfect sense.
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03-29-2020, 10:30 AM | #6 | |
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Location: Sweden
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Re: 49 vs 50 car water pumps
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Quote:
The widebelt is at it´s max going over the small generator pulley that takes energy and creates stress in it. a narrow belt can handle small pulleys better. And with 2 belt setup the wrap angle of the crank and fan/generator pulley is increased. So my thinking is that the new setup gave longer time between maintenance. |
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03-29-2020, 11:29 AM | #7 | |
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Join Date: May 2010
Location: Granger (Northern) Indiana
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Re: 49 vs 50 car water pumps
Quote:
You may be right, but....trucks kept the single wide pump/gen. belts through '53,.... and the narrow belt iron crank pulley is stepped, which requires the offset pump's pulleys having different sizes to run at the same pump rpm. |
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03-29-2020, 11:36 AM | #8 | |
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Join Date: Apr 2015
Location: Sweden
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Re: 49 vs 50 car water pumps
Quote:
Or maybe the new ratio was for cars only which was driven faster and the higher rpm gave problems with pumps cavitation...and they wanted to keep them apart. |
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03-29-2020, 12:02 PM | #9 |
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Join Date: May 2010
Location: Granger (Northern) Indiana
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Re: 49 vs 50 car water pumps
I thought fan noise could have been a reason since Ford switched from 4 to a 3-blade fan in '50, although Mercury stayed with the 4-blade through '53, and used the same narrow belt system and crank pulley.
I have the '49-'51 Ford and Merc shop manuals and can find no explanation why in either. Another flathead mystery! |
03-29-2020, 05:09 PM | #10 |
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Join Date: Sep 2011
Location: Madras Oregon
Posts: 89
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Re: 49 vs 50 car water pumps
I have a stroker 8ba in my '40 Tudor. I used the narrow belts thinking buying a replacement on the road would be much easier. I even run the '51 car pumps with some nice adapters I got with some stuff from a '36 with an 8ba that was being hot rodded. They bolt to the pumps and then use a stock '40 biscuit. All works great.
Dave |
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