Thread: Stromberg CD carbs

Gents, work this out.

I put carby rebuild kit through my Stromberg carbs. New main jet and needles in both as the rangie was farting out black smoke. The v8 has lpg twin mixers and vaporiser. its still running poorly with high petrol fuel consumption. when i turn it off it farts and stumbles (runs on abit.) followed by a metalic pop like a 20 litre oil drum why is this-what is this? Nobody wants to even touch to service/tune the lpg/ petrol system. one weird thin is that the rangie has vacuum needle lifters, that is when running lpg needles are sucked up to reduce wear on needles. Running on petrol the hoses suck lifting the needles( vaccum solenoid possibly stuffed) question is when i remove the vaccum tubes from the top of the carbies and plug it off, the vehicle runs rough????? the carbies shouldnt need additional vaccum from lpg system to work properly! any suggestions gents. also i have bought a holley carb and manifold for rangie. Do 3.5 and 4.6 heads differ- intake ports sizes ??? Anybody running holley carb and are you running off road kit and what size holly suits rangie. I just thought i would simplify things on the rangie with one carb and one mixer? am i going the right way???

Originally Posted by mateusz

the jets were knocked out and new ones put in to the same height.

I do have the impco lpg system.

lpg does work but cuts out after a period of running without the main mixer on the firewall freezing. was told de waxing little mixers either side carbs could work.

.just before the rangie lost its starter motor, it was blowing smoke---.

!
Im still stumbled with the vaccum issue that is when i take of the vaccum from top strongbergs they dont work?

ooh i need to spend some time on the beast.

Last sentence makes sense , sound like you have more than one issue .

If it`s still blowing black it could be the needles but as you know there are other things too .

If the carbs aren`t set correctly in the first place you will waste alot of time on it .

Our carb RR has the same impco mixers (100 each side ) been on lpg since 1992 still runs fine on lpg .

If the converter is mounted on the firewall , that sound like it`s too high in relation to the top of the radiator to not cause problems but if it`s been working it must be ok .

There will be a filter in the line somewhere , these if waxed/gunked up can let them run for a time and then stop and won`t want to restart for some time .

The converter doesn`t need to be iced when you look at it to be a problem .

If it is damp , has moisture on or coming off it , that is also a tell of icing internally or lack of coolant or coolant movement or block as in air lock .

If you mean your removing the vacuum hoses from the tops of the pots and not blocking them off , there can be no vacuum influence inside the top of the carbs and the inlet will be getting too much air , both ends need blocking .

Have a look at the needles you replaced , if they were dirt/lpg effected you will see a sand blasting type of look on one side and the needle will not have a smooth , cylindrical type taper , one side will appear to have a flatter , wider shape . On lpg the needles always sit in the air flow because of the raised pistons .