Volvo RWD 140-160 Forum

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Talk of 2' SUs 140-160

posted by  someone claiming to be anthony on  Sat Feb 28 22:18 CST 2004 [RELATED]

Hello.
I've had this on my B20 with HS6's... I put it on a dyno, and saw this happening. What I did was cut the big cast-tron tube which connects the 2 carbs, welded it closed. And joined the two carb with a small hose instead (1/4"), just to balance the vacuum at idle. With the 2 carbs running independently (not joined at all) the engine wouldn't idle too well, and the carbs' pistons would go up and down all the time (like vibrate more like.)

My guess is that the carbs aren't perfect, and it's easier to raise one carb than the other... so one decides to flow more than the other and route the mixture through the big-cast balance tube instead.
Hope this helps.





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New Talk of 2' SUs [140-160]
posted by  KLR142  on Wed Feb 25 07:53 CST 2004 >


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