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Twin Feeds

Posted by surfpea

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Twin Feeds #1
surfpea Paul Edge new westminster, British Columbia, Canada	Posted: September 13, 2012 07:52AM Registered: 3 years ago Posts: 211

Instead of having two float bowls feeding my twin HS4 carbs, why not have one and branch off the line to the jets? My point is that you'd have the same float level for both carbs.

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Re: Twin Feeds #2
Billm Bill Masquelier Santee, Ca, USA 1965 MG Midget MkII	Posted: September 13, 2012 08:27AM Registered: 6 years ago Posts: 1,476

True unless you were accelerating, brakeing, going up a hill or going down a hill- then they wouldn't be the same level.
BillM

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Re: Twin Feeds #3
trevorwj Trevor Jessie Louisville KY, USA	Posted: September 13, 2012 11:32AM Registered: 5 years ago Posts: 2,280

HIF's do a better job of maintaining matching float levels, but have plenty of other draw backs.

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Re: Twin Feeds #4
mjamgb michael anderson NORTHERN NEVADA, USA 1954 MG Magnette ZA 1967 MG MGB 1973 MG MGB 1974 MG Midget	Posted: September 13, 2012 03:48PM Registered: 4 years ago Posts: 6,395

The carb and choke interlinks may become an interesting challenge. Unless you ran one jet tube all the way to the opposite carbs float bowl "outboard" but then the delivery "signal" would run into friction loss issues, especially at higher throttle demand.

Then there's hills. the "downslope" most carb would have more head on it so would have a higher fuel level at the jet. Granted, likely less than a couple thou. but still...

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Re: Twin Feeds #5
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: September 13, 2012 10:08PM Registered: 4 years ago Posts: 13,091

Please do not even attempt to redesign the absolute best design of side draft carbs ever created. A nice esoteric suggestion but falls far short of practicality for innumerable reasons Bill M just began to touch upon.

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Re: Twin Feeds #6
AmishIndy Seth Jones Wheaton, IL, USA 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Posted: September 13, 2012 10:40PM Registered: 2 years ago Posts: 3,073

In reply to # 2168881 by surfpea Instead of having two float bowls feeding my twin HS4 carbs, why not have one and branch off the line to the jets? My point is that you'd have the same float level for both carbs.

Then why have two separite carbs? Why not just have one with two barrels like a webber DCOE or something? By all means redesign it. I think in attempting to do so you may begin to understand why this arrangement was chosen.

Seth Jones

1971 MG Midget

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