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Hello everyone, I am trying to help my dad tune up and fix his Midget. And in the books, it says "11 Flats from bridge" and nowhere in the book does it explain where that is. I believe we are working on his carborater (sp). So if anyone can help me, I would greatly appreciate it! Thanks!!
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Little lost on the terminology
- Thread starter lilpbnjam
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Bruce Bowker
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11 Flats from bridge /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif
Leave it up to the British for clear terminolgy. I am sure someone knows.
Leave it up to the British for clear terminolgy. I am sure someone knows.
well using deductive reasoning, from bridge would mean going out away from a bridge or something that would conect 2 things like te carb linkages, and 11 flats would probably be the 11th flat spot or maybe number 11 on a guage. more of the manual around the quote would be helpful
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aerog
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Not seeing that quote in the context it's written in the book I'm making a wild guess... but usually when you're turning an adjustment nut or bolt a "flat" refers to the flat side of the nut or bolt-head. 11-flats would mean to turn it so that 11 of that flat sides have passed a single point.
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[ QUOTE ]
Not seeing that quote in the context it's written in the book I'm making a wild guess... but usually when you're turning an adjustment nut or bolt a "flat" refers to the flat side of the nut or bolt-head. 11-flats would mean to turn it so that 11 of that flat sides have passed a single point.
[/ QUOTE ]
that's what it would mean in the pneumatic transmitter business, although we don't have many any more we typically tune by the number of flats on a hexagonal nut we turn. gets down to a quarter of a flat sometimes
Not seeing that quote in the context it's written in the book I'm making a wild guess... but usually when you're turning an adjustment nut or bolt a "flat" refers to the flat side of the nut or bolt-head. 11-flats would mean to turn it so that 11 of that flat sides have passed a single point.
[/ QUOTE ]
that's what it would mean in the pneumatic transmitter business, although we don't have many any more we typically tune by the number of flats on a hexagonal nut we turn. gets down to a quarter of a flat sometimes
G
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[ QUOTE ]
Not seeing that quote in the context it's written in the book I'm making a wild guess... but usually when you're turning an adjustment nut or bolt a "flat" refers to the flat side of the nut or bolt-head. 11-flats would mean to turn it so that 11 of that flat sides have passed a single point.
[/ QUOTE ]
This is correct. The flats are refering to the edges of the adjustment that is designed like a bolt head but I have no idea what the bridge is. I saw this terminology in the tuning instructions of a Sprite I had refering to the carburator mixture adjustment. It was a '68 but it has been too many years ago for me to remember any more than that. Maybe someone from England could join in and clear it up.
Not seeing that quote in the context it's written in the book I'm making a wild guess... but usually when you're turning an adjustment nut or bolt a "flat" refers to the flat side of the nut or bolt-head. 11-flats would mean to turn it so that 11 of that flat sides have passed a single point.
[/ QUOTE ]
This is correct. The flats are refering to the edges of the adjustment that is designed like a bolt head but I have no idea what the bridge is. I saw this terminology in the tuning instructions of a Sprite I had refering to the carburator mixture adjustment. It was a '68 but it has been too many years ago for me to remember any more than that. Maybe someone from England could join in and clear it up.
A
aerog
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I found it I think. In the 62-70 MGB Owners Manual reprint:
"Screw the jet adjusting nuts until each jet is flush with the bridge of its carburetor, or as near to this as possible (both jets being in the same relative position to the bridge of their respective carburetters). Replace the pistons and suction chamber assemblies, and check that the pistons fall freely onto the bridge of the carburetters (by means of the piston lifting pins). Turn down each jet adjusting nut two complete turns (12 flats)."
So - a flat is a "flat" side of the adjusting nut. I think you'll find the bridge is bottom part of the carb body where the jet sticks up. The SU manual refers to the bridge again when talking about making sure the piston falls freely "onto the bridge".
I think the point is the top of the jet should be flush with the bottom of the carb when you're looking inside where the piston should be (pull it out to do this obviously), or if you're running two carbs both jets should be set equally. This is only a starting point anyway and isn't critical. As long as you get them balanced and the mixtures set properly on both you'll be fine.
"Screw the jet adjusting nuts until each jet is flush with the bridge of its carburetor, or as near to this as possible (both jets being in the same relative position to the bridge of their respective carburetters). Replace the pistons and suction chamber assemblies, and check that the pistons fall freely onto the bridge of the carburetters (by means of the piston lifting pins). Turn down each jet adjusting nut two complete turns (12 flats)."
So - a flat is a "flat" side of the adjusting nut. I think you'll find the bridge is bottom part of the carb body where the jet sticks up. The SU manual refers to the bridge again when talking about making sure the piston falls freely "onto the bridge".
I think the point is the top of the jet should be flush with the bottom of the carb when you're looking inside where the piston should be (pull it out to do this obviously), or if you're running two carbs both jets should be set equally. This is only a starting point anyway and isn't critical. As long as you get them balanced and the mixtures set properly on both you'll be fine.
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Well finally!
Been waiting for someone to come up with the right answer.
D
Been waiting for someone to come up with the right answer.
D
I'll have to second aerog's findings.
Having recently rebuilt both HIF's for my 74.5 mgb-gt, I remember that language in the repair manual.
The "bridge" is the flat,rectangular section of the carburetor throat that surrounds the metering jet and is the portion that the piston seems to rest against when the needle is all the way into the jet.
If you have a carburetor rebuild kit handy, and it still contains the instruction sheet, it may, like mine, contain a sketch of the referenced parts.
Mike
Having recently rebuilt both HIF's for my 74.5 mgb-gt, I remember that language in the repair manual.
The "bridge" is the flat,rectangular section of the carburetor throat that surrounds the metering jet and is the portion that the piston seems to rest against when the needle is all the way into the jet.
If you have a carburetor rebuild kit handy, and it still contains the instruction sheet, it may, like mine, contain a sketch of the referenced parts.
Mike