2+2GT,
I didn't want to hijack any other threads so I'm starting this one. How does one determine the optimum advance curve (mechanical & vacuum) for a given engine setup? Here is my engine at a glance:
>99-ish Explorer 5.0 with stock hypereutectic pistons
>GT40-P heads
>Performer RPM intake
>B303 Ford roller cam - specs: Ford Racing Performance Parts
(cam installed advanced 4 crankshaft degrees)
>1.6/1 roller rocker arms
>Quick Fuel Technology 580 vacuum secondary carb
>Try-Y headers/2 1/2" exhaust
>T5 transmission
>Mallory "57" series magnetic breakerless vacuum advance distributor
The distributor in "out of the box" form gives maximum 24 deg mechanical advance at +/- 3000 rpm, approx. 13 degrees at 1500 rpm and no mech advance below 950-1000 rpm. The vacuum can is adjustable from o to about 16 degrees.
I have seen you post stock Ford advance specs in the past, however it seems that these specs are not necessarily applicable with the different vacuum characteristics of an upgraded/performance cam. When those specs are listed, they state at distributor rpm, can I assume that they mean distributor rpm being half of the engine rpm. Please school me and/or point me to some informative articles/tutorials concerning distributors.
Thank You Much,
Gene
I didn't want to hijack any other threads so I'm starting this one. How does one determine the optimum advance curve (mechanical & vacuum) for a given engine setup? Here is my engine at a glance:
>99-ish Explorer 5.0 with stock hypereutectic pistons
>GT40-P heads
>Performer RPM intake
>B303 Ford roller cam - specs: Ford Racing Performance Parts
(cam installed advanced 4 crankshaft degrees)
>1.6/1 roller rocker arms
>Quick Fuel Technology 580 vacuum secondary carb
>Try-Y headers/2 1/2" exhaust
>T5 transmission
>Mallory "57" series magnetic breakerless vacuum advance distributor
The distributor in "out of the box" form gives maximum 24 deg mechanical advance at +/- 3000 rpm, approx. 13 degrees at 1500 rpm and no mech advance below 950-1000 rpm. The vacuum can is adjustable from o to about 16 degrees.
I have seen you post stock Ford advance specs in the past, however it seems that these specs are not necessarily applicable with the different vacuum characteristics of an upgraded/performance cam. When those specs are listed, they state at distributor rpm, can I assume that they mean distributor rpm being half of the engine rpm. Please school me and/or point me to some informative articles/tutorials concerning distributors.
Thank You Much,
Gene