Update time. done the square root of nothing with the Staaag since Kop Hill last September.
Really need to use it more. Anyway connected the battery and it fired straight up first pull. yay, took it out for a drive and have absolutely no idea why I dont use it more often. Overdrive doesnt work, suspect dodgy lectrics.
anyway mate of mine is struggling with his stag over fuelling. so I offered to have a look at his carbs
Stag uses Stromberg CD 175 carbs, each with its own choke and temperature compensator. Air fuel mix then travels through a really shit inlet manifold and into the cylinders.
Common problems with stag carbs flooding is fuel pressure. OE pumps are NLA, replacement pumps are better geared to injection systems.
Needle valves in stromberg float chambers dont like more than 2psi so a fuel pressure regulator is needed. Paul had already done this. And still couldn't get his engine to run lean.
Firstly I checked the depth of the main jet, this should be 80thou to 110thou below the surface
Using my homemade depth gauge I found they were both 90thou
Next up is the choke modules. these have a spring loaded disc that rotates against holes on the side of the carb body. folk sometimes fit gaskets, which is a bad idea as the chokes will always allow fuel to pass through, hence a constant rich mixture.
Both choke module discs were very sticky on the spring
After this I removed both float chambers on the bottom of the carbs, the floats have to be set 16-17mm above the carb body (without gasket fitted) and measured at the corner of the float nearest the pivot.
these were 14mm, this meant that the float chambers would fill too much and then flood through the main jet into the carb throat
measured the diameter of the main needle which had worn by 2thou at the fat end. more that serviceable
Decided to strip the carbs down and give them an ultrasonic bath
I bought this unit as a cheapo but am so impressed with it I plan to invest in a larger unit that will take a whole carb body.
I have to fiddle with the carb body in this unit because I can only get 3/4 of it under the surface
20 minutes later and the float chamber vent valve is working again. this little brass pin gets pushed in when the throttle closes and allows the float chamber to breath through the air filter.
edited to add - if it doesnt breath when the throttle is closed and the float is allowing more fuel into the float chamber it will flood through the main jet
Both choke modules responded well to and ultrasonic cleanse and now work perfectly
Shitroen C4 GP 2007 1.6HDi - Wife's daily written off, farewell trusty but slightly unpredictable steed
Pug 307 - son's daily runner Sold to Arthur Foxhake
Range Rover Vogue 1993 - my daily runner
Daewoo Matiz 2002 - Sold
Jaguar x308 Sovereign 4 litre - nicked by Fathathestag might be up 4sayle soon
Triumph Staaag 1973 - cheaper than a mistress.. just
Range Rover 1972 - ongoing extensive restoration
Range Rover 1972 - complete shed but in line for restoration
Land Rover 1969 SIIa SWB - belongs to Fathathestag but maintained and welded by me
BMW E46 318i touring - sold to hhhugues