Dr_Grip
08-04-2015, 10:17 PM
I am splitting this off from my old/main thread (http://www.gearhead-efi.com/Fuel-Injection/showthread.php?4419-TBI-conversion-on-a-Ford-400-need-help-getting-it-to-run) in order to keep issues separate. With the engine finally running okay, I wonder how to set timing. I found the specs for the original distributor (http://www.ford-trucks.com/forums/324022-1971-distributor-and-engine-specifications-for-the-400-a.html#) and tried to mold them into a base table:
http://pic.armedcats.net/d/dr/dr_grip/2015/08/04/less_sa.png (http://www.armedcats.net/image/view/dKuT5dmjzoiXgFft)
On the other hand, the MAP reading when idling in D is 55 anyways, so I wonder whether it'd be better to bring all the (simulated) vacuum advance in before that:
http://pic.armedcats.net/d/dr/dr_grip/2015/08/04/sa_map_0804.png (http://www.armedcats.net/image/view/6Fnlx8bWm5Q8fmTX)
Which one would you use as a starting point? With the bottom one I did not expect any pinging or detonation yet, "only" one backfire through the intake on a sudden kickdown from idle when not in gear (which might even be not connected to the advance settings at all).
But then again, due to the car not having a fuel tank yet I've only tested the engine in Neutral.
EDIT: Spark plug gap is set to 0.050, matching a Duraspark-equipped later year Ford 400 engine.
http://pic.armedcats.net/d/dr/dr_grip/2015/08/04/less_sa.png (http://www.armedcats.net/image/view/dKuT5dmjzoiXgFft)
On the other hand, the MAP reading when idling in D is 55 anyways, so I wonder whether it'd be better to bring all the (simulated) vacuum advance in before that:
http://pic.armedcats.net/d/dr/dr_grip/2015/08/04/sa_map_0804.png (http://www.armedcats.net/image/view/6Fnlx8bWm5Q8fmTX)
Which one would you use as a starting point? With the bottom one I did not expect any pinging or detonation yet, "only" one backfire through the intake on a sudden kickdown from idle when not in gear (which might even be not connected to the advance settings at all).
But then again, due to the car not having a fuel tank yet I've only tested the engine in Neutral.
EDIT: Spark plug gap is set to 0.050, matching a Duraspark-equipped later year Ford 400 engine.