Nelsthebass wrote:
Out of interest Ken, how do you tell when a carb is at or near stoichiometric? I guess some expensive piece of analysing kit is required or do you just experiment with different jet sizes until it seems right?
That is one solution, a cheap gauge and narrow band Lambda sensor. With power plug, then it is
plug'n'pray...
Of course this is needed to weld on exhaust. It is possible to install so it it nearly impossible to see when sensor is removed...
I like to use Lambda, even in cars (and motorcycles) what have carb. Narrowband sensors are cheap, and often easy to find from cars scrapyard. Of course wideband sensor with own gauge (have two on my other EFI-Dyane) is better, but much expensive...
With friend, we finally find what was wrong on his -57 DS, with narrowband sensor and gauge. He has tried to get correct mixture, but couldn't get it without that gauge. With gauge, it was clear to see what is happening in different driving conditions, and easy to correct right jet. Not so easy task to 50's twin choke Weber, where idle mixture is controlled by 2nd choke, and also BVH gave some extra variables...