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11-03-2014, 06:08 PM | #1 |
Senior Member
Join Date: May 2010
Location: California
Posts: 982
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Model B Carburetor rebuild
I am rebuilding two Model B carburetors. I ordered two rebuild kits. They are labeled 00511-1 Sacramento Vintage Ford. I flow tested the jets and the results were not what I thought they should have been. I used a 37 1/4" head.
For the Idle jets I recorded 58 and 60. For the Main jets I recorded 80 for one and 83 for the other. For the Cap Jet I got 378 and 376. For the Comp jet I got 148 and 142. For the Power jet I got 46 and 44. The Main and Power jets are way off. I know how to adjust the jets by drilling. My questions are ---> Has anyone else measured the flow rates for the jets in the 00511-1 B cab rebuild kit? If so what flow rates did you measure and did you open up the jets? Or has anyone rebuilt a B carb with this kit without adjusting the jets? If so did the engine run lean with not enough power? Below is a table from Vince Falter's "Ford Garage" showing flow rates from various sources. |
11-04-2014, 03:33 AM | #2 |
Senior Member
Join Date: May 2010
Posts: 4,179
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Re: Model B Carburetor rebuild
Hi Bob,
Thanks for taking the time to report on these helpful comparisons between "new" jet flow & the recommended & specified jet flow rates. Appears the B "new" jet flow readings you are getting are just as far off as the A "new" flow readings I got about 8 years ago when testing same. I did not keep records because the "new" jets from several responsible vendors were really ridiculous & a were a waste of money spent. When called to report the findings the vendors replied these were the best they could find to offer. All varied quite a bit & I am sure they were poorly manufactured with absolutely no quality control. I had several old "original" jets from several carburetors that were correct so I re-installed these "original" jets. Under "Search", one can find out where it has been reported to buy quality flow tested jets. |
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11-04-2014, 11:07 AM | #3 |
Senior Member
Join Date: May 2010
Location: California
Posts: 982
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Re: Model B Carburetor rebuild
I measured the main jet hole size and it was about 0.029". I measured an original main jet and the hole was 0.037". These hole sizes account for the difference in flow rates. Below is a picture of the reproduction and original main jet holes. Notice the size of the holes and the shape of the jet around the hole. On the original there is a concave area around the hole. Again has anyone else rebuilt a B carb? If so what did you find in quality of the parts and performance of the rebuilt carburetor?
Bob |
11-04-2014, 09:31 PM | #4 |
Senior Member
Join Date: Jul 2010
Location: Auckland, New Zealand
Posts: 518
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Re: Model B Carburetor rebuild
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I get 21 to 23 MPG on a trip (Mitchell O/D) and 17 to 18 mpg round town on short trips. These are big Imperial gallons (divide by 1.201 to get US MPG). One day I may recalibrate the jets so the GAV will run closed but there are lots of other things to do first. I also have lots of new A carb jets that are wrongly sized too. SAJ in NZ |
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