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Small Air Cooled Gasoline Engines

Suction VS Float type carbs


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Old 10-21-2011, 04:08:19 PM
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Bigjoedo Bigjoedo is offline
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Default Suction VS Float type carbs

Hey,

Just curious about the pros & Cons of each type. My Briggs engines with suction carbs seem to start and run well. The few I have with float type carbs, that are harder to start and don't seem to run as well?

Bigjoedo
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Old 10-21-2011, 05:31:37 PM
Rex Wellendorf Rex Wellendorf is offline
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Default Re: Suction VS Float type carbs

Hi;
That's been my experience too. Adjust them with a half full tank of gas to run good, then when the tank is full they run fine but a little rich, and close to empty they run fine but a little lean. But overall they run plenty good for me. I like'em.
Rex.
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Old 10-21-2011, 08:34:54 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Suction VS Float type carbs

Rhe B&S updraft carbs weren't the best. They tend to flood easily, and their transition from idle to high speed is poor. The biggest problem with the suction carbs is that the neoprene diaphrams don't last with the crap E-10 gas we use now days. Oh well, can't have everything!
Andrew
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Old 10-21-2011, 08:42:55 PM
sprkplug sprkplug is offline
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Default Re: Suction VS Float type carbs

The older vacu-jets were sensitive to the fuel level in the tank, while the newer pulsa-jet helped overcome that to a great degree. The float types, (flo-jets) tended to be harder to start, especially in colder weather. However, if the tank went dry while you were using them, the float style that was gravity fed would usually restart quicker than the pulsa-jets, which required some cranking to bring the fuel up into the main discharge sump in the tank.

The flo-jet carbs suffered some when used on equipment that shook, or vibrated a lot. (tillers). The float would bounce around too much, causing an uneven mixture. A lot of times these carbs would be equipped with a dampening spring on the float to help alleviate this problem. It wasn't an issue on the pulsa-jets, and usually wasn't too bad on the vacu-jets.

The vacuum type carbs eventually gave way to the float type, due in a large part to the float types having both an idle circuit, and a main circuit. The vacuum types had one mixture screw, which was more of a compromise between high and low speed. The float types could control the mixture much better,(leaner for all operating conditions), which was a big hit with the EPA.
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Old 10-21-2011, 08:59:01 PM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Suction VS Float type carbs

Quote:
Originally Posted by Andrew Mackey View Post
Rhe B&S updraft carbs weren't the best. They tend to flood easily, and their transition from idle to high speed is poor. The biggest problem with the suction carbs is that the neoprene diaphrams don't last with the crap E-10 gas we use now days. Oh well, can't have everything!
Andrew
Ya the E10 crap is so bad for those diaphragms. It just destroys them, I had one destroyed over 1 summer because of E-10 crap.
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