MG MGB and MGB GT Tech Talk
This question has been puzzling me since I've first heard the the Zenith doesn't have a "choke" but rather an "enrichment valve." Why is that? Is it because it really doesn't "choke" off the air from coming in (as in a Weber or Holley?) If that's the case, then the SU's wouldn't really have a choke either, since your just enriching the mixture by adding more gas, but not "choking" off the amount of air coming in. Am I off base here?
Nope, SUs don't have a "real" choke either. Nor do sidedraft webers. For basically the reasons you mentioned. It's just easier to call it a choke... either way, the end result is the same: a richer mixture.
Enriching is as efficient as choaking, all fuel injected cars has some form of enrichment for cold starts. Early Bosch systems had an electrically operated injector centrally located in the intake manifold and the rest of them were mechanical. A super simple, very efficient system. I had a 1980 Saab 900 with it for 14 years and never had to do a thing to that system
Ahhh... K-Jet... when it works, it's bulletproof... really a pain to fix though... hard to troubleshoot. More often than not, it's a vacuum leak. Very sensitive to vacuum leaks.
I once had an Austin-Healey 3000 that had a "Starting Carburettor", an electric device attached to one of the main carbs that was actuated by a solenoid in the engine block. These were more commonly found on Jaguars, but used for two years in Healey production. Its function was to spray raw gas into the manifold for cold starting. It worked, too and made an awful hissing noise when in operation!
My question is: does this device actually qualify as a choke? Maybe not, since it does not regulate the air flow???? Thanx! AL Bradley
Really it's all about enrichmnent when starting a cold engine. Put in more fuel or less air. Actually a choke is an intake air restricting device, but they couldn't write that on a control knob large enough to be seen. Some guy on death row came up with choke and they used it from then on. ;^)
put on a weber or a pair of su...in any case get rid of the Z,,,abd the Stromberg...they both are bad very bad.
