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Old 05-02-2015, 10:11 PM   #1 (permalink)
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Default 1997 F6A Carb issues?

I have what I believe is a 1997 Suzuki Carry!It has F6A stamped in the engine bay....My current carb is shot !
Here is a picture of the current carb and here's a picture of a carb that I was sent which was suppose to fit....it would mount up except for 2 coolant ports underneath!Would this still work....
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Old 05-03-2015, 09:02 PM   #2 (permalink)
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Greetings! What issue with cooling ports? 2 hoses, connect to either port, interchangeable.
Do other ports line up?
Carb is almost always same, but hose configuration changes with year due to emissions control.
Pictures are bleary
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Old 05-03-2015, 09:04 PM   #3 (permalink)
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okay!So I can use said carb?I'm really not worried about emissions as it's a farm truck....how would I know if I have electronic or manual choke....both carbs have a solenoid with a connector jutting out
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Old 05-03-2015, 09:17 PM   #4 (permalink)
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This is the type of carb I had on the truck
notice the two coolant nipples underneath!The new carb doesn't have those ports!I'm guessing I should be able to bypass those ports?
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Old 05-07-2015, 02:46 AM   #5 (permalink)
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This is what I found about WHY they are there, best explanation, has to do with carb ice, best I can come up with.
That is called the Thermac system in GM nomenclature. It's purpose is to ALWAYS deliver at least 100*F air into the carb by mixing hot air from the heat stove and cold air from the regular snorkel opening. There is a thermal vacuum switch built into the base of factory GM air cleaners to modify the amount of vacuum sent to the "flapper door servo" on the snorkel for this reason- to get the proper mix of hot and cold air to make it 100*F inside the air cleaner.

It serves TWO purposes, actually, neither of which probably matters to you, but definitely matters on factory vehicles.....

1. It is to help with emissions. Carbs do a better job supplying a consistent A/F ratio if the intake temp is held constant. Carbs can't compensate for air temp changes very well. It's not a big difference, but when you have to pass Gov't emissions testing like the OEMs do, every little bit helps.

2. The REAL reason. Preventing carburetor icing. This is a phenomenon that happens between about 30* and 50*F. Any moisture in the air (humidity) will condense on cold parts, much like fogging a mirror. This is not a problem unless the part they condense onto is COLDER than 32*F. Then that condensation turns instantly to ice. The throttle plates on a carburetor get VERY cold due to the fuel being atomized and evaporated in their vicinity (evaporation is a cooling process, if you remember high school physics). When there is sufficient moisture in the air and temps are within spitting distance of freezing the throttle plates can start to get a buildup of ice on them! This buildup slowly starts to choke off the airflow past them, especially at idle when the throttle opening is very very small. Idle speed goes lower and lower and lower as more and more ice builds up. The engine can actually stall in extreme situations! And this phenomenon will persist until either the air going through the carb gets warm enough to stop it or engine heat penetrates into the carb and makes the throttle plates too warm to allow ice to form.

It takes a LONG time for engine heat to conduct up into the carb. Heating the incoming air can be done MUCH faster with the Thermac (intake air heating) system. Which is the main reason why it existed even before the "emissions era" of the 1970s.

Do you need this on your modified vehicle? No. Not unless you daily drive in cooler weather. Then it can be handy. But even on a daily driver, you can just feather the throttle a little on cold mornings until the carb and intake heat up enough to prevent carburetor icing. In short, it's no biggie.
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Old 05-12-2015, 11:44 PM   #6 (permalink)
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Greetings! I live in Philippines. Local mechanic said water lines to carb are not needed and he has left them off.
I have a fuel injected van, have not had a carbed vehicle for more than 10 years, so had to research it.
The long and short of it are carb icing, and vapor lock.
research and see if you live in an area that that can occur in, and how isolated you will be if they occur.
Good luck.
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