Quote:
Originally Posted by spacetiger
I wonder if you can figure out the ignition timing vs. valve timing per RPM to see where the piston is relative to the firing.
Seems to me, the best mileage is when you are getting optimal bang to push the pistons down. Taking into account the flame travel time and engine timing (piston, valve timing, and ignition timing), it would seem that would work out to be the best for emissions. I am surprised you can smell the difference. Is it a (unburned) gas smell?
If so, that would not be good for the cat as you could burn it out early - then the mileage would drop and codes tripped...
Jerry
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No it's the smell of oil. My ranger has 180k on it and quite a bit of oil blows past the rings. And I think I'd need to have a catalytic converter in order for it to get fouled up lol. I can see your point about the timing though. If the ignition set of plugs are supposed to spark, say, at around 4 deg. BTDC, (just a random number) maybe the second set of emmisions plugs are supposed to fire directly at TDC or maybe even slightly after, then the second spark after switching the wires around would do absolutely nothing. But, us ranger owners have a unique chance with the dual spark heads. I'll look around at the junkyard and if I can find a wiring harness, I'll do an experiment to add a plug going from the wiring harness on the main coil pack to go to the secondary could pack. This way, the timing for both sets of plugs would be exactly the same. I just looked online the coil packs are the same part number, so it must be the trucks comPuter that makes the secondary Plugs low voltage. By adding on another plug to the wiring harness, the computer will make both coil packs fire the same and at the same time. It's worth a shot, anyways.