Hi there!
I have a SPF Cobra, bought from Hillbanks, and had a Pro-System Carb 834cfm on the 427cui Stroker (from Automotive Engine Specialties). The Carb worked fine over 2500U/min, below it was not working fine. Also the missing choke is a problem for me. OK, some adjustments and with a warm engine it could be fine, but I would not be satisfied.
So, I changed the Carb to a new QFT with e-choke and mech. Sek. Don't think about it again
The engine is hanging realy fine on the throttle, runs smoother and not as loud? as before. I am definitely faster on the road. But a bit less power on top, but that was precalculated.
First Setup:
Prim: 72; Sek: 82; Idle: 70, main: 28
Gas in the middle of the glas, 6,5psi regulator, floater and needle OK, fuel vent installed, power valve is 45 (4,5), choke works fine, double pumps are adjusted (not nozzle and valve).
Some things are still to improve, like the exorbit waste of gas
I use an AFR Tool to measure and at Idle if have a rate about 12
. Much too rich. Should have 14,3-14,7(= 1 as perfect mixture). Idleneedle 1 turn out.
Driving is between low 11 and 12. Power or getting off the gas is up to 14.
So my setup is much to rich, but the jets should be OK... ?
Under 2000U/min the engine bocks around and isn't nice to run, this will be a couse of the rich mixture I think. If I increase the idle up to 1800U/min this gets much better but not a solution.
So where could be the problem situated?
THX and regards from Austria!
QFT 650cfm on 351W Stroker
Threaded Mode
