650cfm QFT Carb Tuning / 383 / 727
Hi Gents,
I am looking for a set up for my QFT 650cfm double pumper carb as I can't find help over here in France. I would need a configuration of jets, squirters and power valve as a basis I could adjust afterward.
I did some tests but I get lost with my AFR readings. When the carb was stock I thought the Jets were way too big. I changed them, now I'm back trying to adjust the squirter size but now, with secondaries disconnected I get AFR reading around 20...
I did try to tune my carb last year and ended with this configuration :
Primary jets : 62
Secondary jets :74
Primary Squirter : 42
Secondary Squirter : 45
PV: 6.5
But honestly I don't find it runs well. When accelerating from zero at WOT, it stumbles.
Engine is a 383, with this camshaft :
Trans is a 727. The car is a 1970 Duster.
Cheers,
Nico
Hi Gents,
I am looking for a set up for my QFT 650cfm double pumper carb as I can't find help over here in France. I would need a configuration of jets, squirters and power valve as a basis I could adjust afterward.
I did some tests but I get lost with my AFR readings. When the carb was stock I thought the Jets were way too big. I changed them, now I'm back trying to adjust the squirter size but now, with secondaries disconnected I get AFR reading around 20...
I did try to tune my carb last year and ended with this configuration :
Primary jets : 62
Secondary jets :74
Primary Squirter : 42
Secondary Squirter : 45
PV: 6.5
But honestly I don't find it runs well. When accelerating from zero at WOT, it stumbles.
Engine is a 383, with this camshaft :
Trans is a 727. The car is a 1970 Duster.
Cheers,
Nico
