This topic deserves a little chat. We are talking about three major adjustment ideas here -- all interactive: (1) The float level adjustment, (2) The air/fuel mixture adjustment, and (3) The profile
That was a good write-up, and I think your proposed experiment would be very valuable, but it still seems to me that the float bowl fuel level does not directly affect mixture richness, in that it is
Thanks. In my admittedly limited experience, I have found that the float, or fuel level does affect the mixture because it influences how easily the fuel can be drawn into the venturi (remember, ther
Hey Max; Sorry to bust in here, but I have to tell you this: I had the opportunity a number of years ago to spend a day with noted tuner and engine builder, Jerry Branch, who, amongst other things, r
Very interesting. I have always thought of the float bowl as containing a reserve of unpressurized fuel, which flowed into the carburetor as allowed by the needle jet opening. In this view, as long a
This is the way I understand it. Excuse the (bad) ascii art: here is our float chamber: +--+ +--+ **|**|**| <-- fuel level +--+ and with the float too low: +--+ +--+ **|**|**| <-- fuel level +--+ and
We are pretty much talking here, I think, about the SU carb. A number of the carbs on the bikes in question are from the same family as the SU, being of the constant velocity type, and many have idl
Hi Gang, This has been a really interesting discussion for me. Thank you all! Now that we have this whole SU float chamber float adjustment, etc., issue out into the open we can also discuss what hap
I totally agree. The dynamic operations achieved by these precision machines, and machines that frequently receive ZERO maintenance for years, is just incredible. They produce mechanical solutions to
you just might get "flamed" for not knowing it is SKINNERS Union........ Dave -- Original Message -- From: "R. O. Lindsay" <rolindsay@dgrc.com> To: "Dave Munroe" <dave@munroe.ca> Cc: <mgs@autox.team
Yes Max, you are missing something. The flow rate for any given combination of needle/jet position is dependent on the difference between atmospheric pressure pressing down on the surface of the fuel
Good advice CR. On the SUs that DON'T have adjustable jets, like those used on the Series I e-types, the float setting is much more critical. There is no 'nut' to tweak. (Dang! Hurts to even type tha
OK, I admit this is more complicated than I thought... I'm still a little dubious that a pressure differential of .0012psi could make any discernable difference (difference of + or - 1/32nd inch fuel
...and I agree. The mixture nut is about a 24 tpi thread. That means, one entire revolution of the mixture nut / jet height adjustment makes 1/24" or 0.042" difference in the height of the jet. Rick
OK Max and others; If you want to have a real eye opening "practical" educational event, install an O2 sensor driven Air/Fuel Meter in your car. Tune your carb(s) with your Colortune, your balancer,
It is in the weekend plan. And FWIW, engineering isn't speculating. Engineering is applied science. Speculating is guessing while hoping. -- Rick Lindsay Diamond Geoscience Research 5727 S. Lewis Ave
Of course, there comes a time in every project when you have to shoot the engineer and begin production. My father, an engineer, has that on a plaque above his desk. -- ______________________________
Hey, I wasn't speculating! I was in "deny everything" mode... Actually, I don't see any way to measure the kinds of things we're talking about here given the resources at my disposal, so I'll leave i