Timing opinions
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More Turbo
Joined: May 2000
Posts: 655
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Timing opinions
I guess I am running a sort of hybrid I-6 300. The Bronco is an 84 (well started that way). I installed a re-maned long block and the emmision control sensors (air pump, sensors, carb feedback controls) did not make it in the swap. Those parts were eliminated. Recently, I removed the TF-IV distributor and computer completely (it just was not running to my satisfaction) and installed a Duraspark II with a vacuum advance system.
The question is what are you running for timing? I guess I am looking for differant timing specs for older motors? The original 1984 configuration is 10 BTC. What's next on the to do list?
Bob
The question is what are you running for timing? I guess I am looking for differant timing specs for older motors? The original 1984 configuration is 10 BTC. What's next on the to do list?
Bob
Cross-Country
Joined: May 2002
Posts: 98
Likes: 1
From: Southeastern Virginia
Timing opinions
This takes awhile, but it will get you in the ballpark. Advance the timing 1 or 2 degrees and test drive the truck. Make sure the motor is at normal operating temperature. Get out on the highway where you can put a good steady load on the motor. Accelerate in high gear like you were passing someone. Is the engine detonating? If not, advance the timing another 1 degree or so and test drive again. Keep this up until you hear the engine detonating. At this point you are too far advanced for the fuel you are running. Repeat the procedure, but in the retard direction, until you can't hear the spark knock anymore.
Thread Starter
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More Turbo
Joined: May 2000
Posts: 655
Likes: 0
Timing opinions
Have it set at 9 degrees BTC and it is running great. As a matter of fact after the conversion to a vacuum advance I actually picked up significant mileage gains. I was hovering around 10-11 mpg with the eec IV but now I am actually pushing 14 - 15 mpg. 
If I go further on the advance it wants to be hard starting so the 9 degrees is the best of all worlds.
Bob
If I go further on the advance it wants to be hard starting so the 9 degrees is the best of all worlds.
Bob
