Hello all,
it would seem that S.U.'s are not popular over your side of the world, with so many after market Weber conversions and remarks like "pesky S.U.'s."
In my experience, they are reliable and do not need a lot of maintenance other than cleaning and keeping the dashpot oil topped up. Also their spares availability, even for very old carburettors is excellent.
Some quick points:- find the settings for your car, e.g. for H or HS carbs, the jet setting (Only one jet, must be a bonus) is two full turns down from the top. This is a good starting point. If the piston is sticking, clean it and inside the piston housing with solvent only, DO NOT use an abrasive at all, even metal poish. If it does not drop with a click when you lift it (manually with the air cleaners removed)then the jet needs centering, done by screwing the jet fully up, slacken the jet clamp, push the piston fully home and tighten the jet clamp then reset jet to run position.
Sorry, this post is getting a bit long, but with the basics understood they are a good instrument, especially for a road car. (Webers, especially DCOE types make the car less flexible even if they give more top end)
What do I drive?, Triumph 2.5 saloon, er, Lucas petrol injection. (Basically TR5 engine)
Alec
it would seem that S.U.'s are not popular over your side of the world, with so many after market Weber conversions and remarks like "pesky S.U.'s."
In my experience, they are reliable and do not need a lot of maintenance other than cleaning and keeping the dashpot oil topped up. Also their spares availability, even for very old carburettors is excellent.
Some quick points:- find the settings for your car, e.g. for H or HS carbs, the jet setting (Only one jet, must be a bonus) is two full turns down from the top. This is a good starting point. If the piston is sticking, clean it and inside the piston housing with solvent only, DO NOT use an abrasive at all, even metal poish. If it does not drop with a click when you lift it (manually with the air cleaners removed)then the jet needs centering, done by screwing the jet fully up, slacken the jet clamp, push the piston fully home and tighten the jet clamp then reset jet to run position.
Sorry, this post is getting a bit long, but with the basics understood they are a good instrument, especially for a road car. (Webers, especially DCOE types make the car less flexible even if they give more top end)
What do I drive?, Triumph 2.5 saloon, er, Lucas petrol injection. (Basically TR5 engine)
Alec