Rich at cruise, lean at WOT
I'm doing some fine tuning of my carb. It's a 750 double pumper.
I just got a innovate wideband, and I gotta say it is awesome for carb tuning. Here's where the air/fuel mixture is at now:
The primary jets are 71, secondary jets 85
So I'd like to lean out the cruise and richen the wot. The carb has removable air bleeds, but I haven't experimented with air bleeds before. I figure the simple way to tune this carb would be to jet a bit smaller on the primaries and a bit bigger on the secondaries. Is it possible to have too much difference in jet size between the primaries and secondaries? And if so, would I be better off changing some of the air bleeds also/instead?
My targets af ratios are:
Do these seem reasonable?
81 Grand Prix, 355, 700r4, 8.5" 4.10
64 Oldsmobile Jetstar, all original