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07-14-2018, 08:28 AM | #1 |
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model B motor in model A chassis
Thinking of putting B model in model A chassis.
First question; will the motor mounts work? |
07-14-2018, 08:32 AM | #2 |
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Re: model B motor in model A chassis
My roadster has a B engine and transmission with front and rear Float-A-Motor mounts.
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07-14-2018, 08:47 AM | #3 |
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Re: model B motor in model A chassis
Are these custom made for B motor to fit A chassis?
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07-14-2018, 11:26 AM | #4 |
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Re: model B motor in model A chassis
B float-a-motors are different than A, the side-bolts are located differently. e-mail me at [email protected] and I will send the chapter from my book that goes into details.
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07-14-2018, 12:02 PM | #5 |
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Re: model B motor in model A chassis
I kept the Model A transmission. This saved me worrying about pedal adapters and wishbone adapters. I have never had problems shifting the Model A transmission. My first car was a Model A and no it was not new. The Model A flywheel housing will bolt directly to the Model B block. The rear motor mounts attach to the flywheel housing. The Model A front motor mounts bolt directly to the front of the Model B engine thus that problem is solved. I prefer the original mounts to the float-a-motors but that may just be me. The one thing you are going to have to do when you make the conversion is to cut off the back of the Model B oil pan (see photo). If you are lucky you might be able to swap for a pan that has already been cut. The whole project was extremely easy.
Be sure your Model B motor is from 1932. A Model B motor from 1933 or 34 is shorter to allow for the sloped grill. The water pump is shorter (see photo, note the spacing of the grease fittings). The generator is further back on the timing cover (see picture) and the front pulley is shorter (no picture) Charlie Stephens |
07-14-2018, 05:20 PM | #6 |
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Re: model B motor in model A chassis
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I believe the water pump is the longer one. Maybe best to check serial number, if I can make it out. I was told it was a 32, and wasn't aware of the differences. Thanks for your help! |
07-14-2018, 07:48 PM | #7 | |
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Re: model B motor in model A chassis
Quote:
Charlie Stephens |
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07-15-2018, 04:29 AM | #8 |
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Re: model B motor in model A chassis
The engine number on a B engine is not on the pad on the side of the block. It is on a pad on the flywheel housing just above the starter. To use an A gearbox on a B engine, the flywheel housing is changed for one from an A engine and the sheet metal part of the housing removed from the back of the sump. The B number is lost. All that is left is the blank pad on the engine. That might cause some head scratching when it comes time to register a car with such a set up in it.
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07-20-2018, 03:18 PM | #9 | |
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Re: model B motor in model A chassis
Quote:
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07-14-2018, 01:08 PM | #11 |
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Re: model B motor in model A chassis
The previous caretaker made these modifications. I don't know who made the adapters, but this will show what was done .
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07-14-2018, 06:20 PM | #12 |
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Re: model B motor in model A chassis
I have a 34 B engine in my Cabriolet. I just put a higher compression head on it that uses a model A water pump. I've never heard of the actual block being different length. Different length water pumps but not the engine block. Also, I've never seen a serial number on a B block.
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07-14-2018, 06:34 PM | #13 |
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Re: model B motor in model A chassis
My "Diamond B" block was cast (D126 left side of engine) April 12, 1936. Like foxfire42, it has a Brumfield A head and an A water pump. The serial number is on the bell housing and starts with BB. This number was accepted by the CHP and DMV. I happily didn't have to lift the body.
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07-15-2018, 06:15 AM | #14 |
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Re: model B motor in model A chassis
Wow, good information here, thanks for the input. The engine looks complete other than carb. oil cap and I'm guessing fuel pump. Are these fuel pumps and oil caps available?
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07-15-2018, 08:29 AM | #15 | |
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Re: model B motor in model A chassis
Quote:
Charlie Stephens |
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07-16-2018, 12:12 AM | #16 |
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Re: model B motor in model A chassis
I should have posted earlier that the Model A oil filler tube and cap can be used on the Model B engine. The Model B tubes were at first longer (very early) and later a larger diameter . This was done to reduce oil being blown out of the tube, a problem that shouldn't exist on a well built engine.
Charlie Stephens |
07-17-2018, 08:15 PM | #17 |
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Re: model B motor in model A chassis
If you put the B motor in the A and use the Model A Bellhousing and transmission you must trim the back of the B pan in order to fit.this is what I did on mine---B motor runs very smooth.
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07-20-2018, 07:11 AM | #18 |
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Re: model B motor in model A chassis
How did you trim back of oil pan off? Did you take seam loose where back of pan is tacked. I see the rear seal is larger on B motor.
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07-20-2018, 10:33 AM | #19 |
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Re: model B motor in model A chassis
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07-20-2018, 11:00 AM | #20 | |
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Re: model B motor in model A chassis
Quote:
Charlie Stephens |
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