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06-12-2022, 12:31 PM | #1 |
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B carb on A manifold .
I know it is said the B carb gives just under 4 BHP extra . This is on a dyno with wide throttle openings the kind of driving us sedentary old geezers would not do . As in a previous post Henry never bored out an inlet manifold to match carb to manifold throat dimensions . The KAYCE carb which is the same as a Zenith 1 was factory fitted to the narrow bore AF inlet manifold this gives a 1/8" step in the inlet tract Ford engineers were quite happy with that the AF car runs just fine . The thinking must be the throttle plate gives more obstruction . Pics to follow so you can see clearly the factory mismatch . This is double the mismatch in the English AA truck application where Henry put a B carb on an A manifold .
John cloudy warm summer evening Suffolk County England . Last edited by john charlton; 06-12-2022 at 12:43 PM. |
06-12-2022, 12:37 PM | #2 |
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Re: B carb on A manifold .
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06-12-2022, 02:25 PM | #3 |
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Re: B carb on A manifold .
Hey you old phart :-), who are you calling a sedentary old geezer? I'm 85 and going to run my banger at Bonneville in August, aim to better my best time of 167.450.
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06-12-2022, 03:51 PM | #4 |
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Re: B carb on A manifold .
But Jim you are a Legend !!! I am only 83 and am for sure a sedentary old geezer as I suspect a lot on The Barn are too !!! . ( no disrespect of course )
John in same place same weather . |
06-13-2022, 10:41 PM | #5 |
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Re: B carb on A manifold .
John,
I'm 85 and I know for a fact Jim is 1 month younger than me.That "whipper snapper" deserves all the disrespect we can give him. We all qualify for the old farts club. but we are younger than our cars. I run a B carb on an A manifold without boring it bigger. There is a good seat of the pants improvement. Richard Anaheim CA |
06-14-2022, 07:46 AM | #6 |
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Re: B carb on A manifold .
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06-14-2022, 08:10 AM | #7 |
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Re: B carb on A manifold .
At 68 you guys make me feel like my first day in kindergarten!
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06-14-2022, 08:46 AM | #8 |
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Re: B carb on A manifold .
Yeah, you can do all that! I mean run B carbs on unbored A manifolds. It will sort of work. But, when you think about the actual reasons for cleaning up a manifold (Model A or otherwise) You realize it requires more than a hole connection from the top of the carb to the block. Think about the actual function! Moving the air gas mix to the cylinder from the carb, and as quickly as possible. This results in increased volumetric efficiency or as a mechanic might say " You get more gas in the cylinder to make a bigger explosion!" Look up "Porting and Polishing" on youtube. There are people claiming as much as a 15 HP increase by P&P on modern engines. The whole idea id to prevent choke points and turbulence. Both create turbulence and slow down the passage of fuel/air to the cylinder.
Terry |
06-14-2022, 06:27 PM | #9 |
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Re: B carb on A manifold .
I have a B manifold because I am afraid to have mine (A intake) bored on a vertical mill because it might weaken it. If the thing busts on the highway I'd be on a tow truck. You know, seems like every time I try to hire some work out it's; A) not as promised - time, materials used, etc, B) costs about 3 times what I think it should have, C) I have to do it again, or do it again myself.
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06-14-2022, 06:43 PM | #10 |
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Re: B carb on A manifold .
I am running a modern universal Zenith model for the A right now on my car. The carb to manifold bores are just the opposite but it runs real well.
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06-14-2022, 08:21 PM | #11 | |
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Re: B carb on A manifold .
Quote:
Terry Last edited by Terry, NJ; 06-14-2022 at 08:32 PM. |
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06-15-2022, 10:09 AM | #12 | |
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Re: B carb on A manifold .
Quote:
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