here's the situation: three stromberg carbs on a 235. Had a guy rebuild them (I always find a way to mess up a carb...) but he can't be around when we fire up the engine for break-in. I've not much of a clue as to what adjustments do what, so here is a chance for all those obscure stromberg gurus to flex some brain power. I've numbered the items in question, hoping that the pics are suitable for viewing. so take a stab and we can get this thing on the road! here's my guesses: 1: main jet adjustment 2: screw to hold in the magic 3: vacuum port (for distributor advance?) 4: idle richness 5: vacuum port thanks in advance jon
It appears that you are using industrial fork lift or stationary engine carbs. I think #2 is possibly a bowl drain. I would back the #1 main jet adjustment 1.5 turns out off of the seat. I would set the idle mixture screw #4 at 1 turn out off of the seat. The rest is pretty much seat of the pants. I would have a hand held temp gun to monitor the exhaust header temp during run-in and tweak the main jet setting accordingly.
Not quite your unit, but may help http://gallery.oldholden.com/Jack_s/Stromberg+Carburettor+model+BXV-2/ Where do you get the variable main jet kit for these units?
saltracer: the carbs were set at 1.5 turns out on the main jet and 1 turn on the mixture when rebuilt. thanks I really wasn't sure what's what. chebby: that link is what i've been looking for over a month! the main jets came like that. the carbs are marked bxuv-3 on the base. I bought the set from Tom Langdon. he said they were a bit smaller than a bxov-2 and should work better for a triple set up. maybe only the forklifts had the delux variable main jets. So should I be safe in hooking up the vac*** advance to the #3 port? the carb in chebby's link looked to be in the same place. jon
Just in case you may not of found all your answers to you questions of some time back. --------------------------------------------------------------------------------- #1 is an adjustable main jet, but don't take that as what it sounds. It is NOT fully adjustable. It should have a number stamped on it and that would be it's max. opening when screwed open. Screwing it in will decrease the main jet size. You would be better off replacing that adjustable jet with fixed jets and a plug cap, because, how are you going to know if one carb is set to .062" and another carb set at .058" and so on? ------(answer is) you won't know. This would not be a problem if the motor only used one carb. (think about it) Your better off with fixed jets, then you know all three carbs are putting out the same flow at high speeds. If you need help on this let me know, these fixed jets can be had at any size you want. MANY Strombergs came with the so-called 'adjustable main jet' #2 is just a cap to drain the fuel bowl, you do nothing with it, just make sure it's tight. #3 is a vac*** port. You only need to hook up the distributor to this only on one of the carbs (any of the three) and leave the plug in the other 2 carbs #4 is the idle adjustment screw. Start with 1 to 1 1/2 turns open on all three carbs (but keep track), then after motor starts adjust each carb for best idle and vac***. You will probably need to keep bouncing back and forth between carbs a few times to get all three set correctly but once you get there they are done and they don't drift so you set them, then forget them. (it's not at all hard to do, as some people may say) #5 is another vac*** port and just leave this pluged on all three carbs. One bit of advise: make sure you use a fuel pressure regulator and set to 1 1/2 to 2 lbs. pressure. These Strombergs do not like high fuel pressure and their needle valves will leak and over fill the fuel bowl. I'm going to ***ume that all three carbs have the same numbers stamped on top of the fuel bowl covers. If not, then they MAY not be a matched set. (??) It depends on what your rebuilder did or didn't do to the carbs. From the one picture the carb has an electric choke. More than likely it's a 6 volt choke and would burn up if attached to 12 volts. This may be something you might have to find 'a way around', but you only need to choke one of the three carbs in order to start so just leave the other two chokes fully open. You have an excellent set up (not cheap) but it will work very good once set up. If I can be of any help email me at, rocknchair_recording@hotmail.com Good Luck, Ed
On the pressure...spec said to fill bowl at 1 pound pressure to measure fuel level (NOT float level! Fuel, like a 97), then up test pressure to 3 and watch to see if level rises indicating needle valve filure to seal. Float and mains are like a 97, power valve utterly different. I was just reading the Army manual on these for entertainment...
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