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Author
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Topic: 'splain to me jet sizes
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jww_289
Journeyman Posts: 71
From: Victoria Australia
Registered: Feb 2006
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posted 03-09-2006 07:25 PM
 
I have just realized that I have no real idea what the carby jet sizes mean, my 4100 has 48F primary and 58F secondary jets .... what does the 48 etc refer to and what does the F refer to  TIA,
John...... ------------------
1966 fastback
- 4v 289
- T10 4 speed
- Pony interior
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senzstang
Gearhead Posts: 530
From: perry, oh, usa
Registered: May 2002
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posted 03-10-2006 11:26 AM
You might want to try posting this in the Ford Racing forum. That is where the Carb guru's are. I on the other hand am worthless to answer your question  Phil
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Scott H
Gearhead Posts: 1480
From: Chicago area
Registered: Mar 2005
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posted 03-10-2006 12:22 PM
If I recall, they are based on standard drill sizes.
According the the shop manual, an example of stock sizes for a 1966 289 A-code with a 1.08 carb would have 48F for the primaries and 57F for the secondaries in a 49-state car with an auto trans, and 46F and 58F for a thermactor car.
For a manual trans they change slightly to 47F and 58F with termactor control, 49F and and 58F for the 49-states version.
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Jake11
Gearhead Posts: 246
From: Banning,Ca,USA
Registered: Oct 2005
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posted 03-10-2006 05:26 PM
The Autolite numbers don't make sense.
Try adding .01 to the number on the jet.
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