Standing in front of the car, which direction is the IP turned to adjust timing? (towards the engine or away from the engine) I am running waste motor oil and would like to experiment with the timing setting for performance approach. thank you.

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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500.

Toward the engine to advance; toward the driver-side fender to retard. And it doesn't matter where you stand.

If I was going to use used motor oil as fuel. Consideration of buffering the acids present in it would enter the equation. Cheap to do I think.

Just some litmus strips and a common cheap chemical. I am not aware of the strength of the acids in used motor oils but they are developed in use. Amount probably depends on how frequenty the oil was changed you are getting.

Feeding acids through an injection pump and hot injectors as a regular diet again raises questions. On the otherhand injection pumps are reasonably inexpensive at a pick and pull. I am really not an enviroment nut either. Yet what is perhaps coming out of your tailpipe might be pretty nasty.. My hope is the combustion temperature is destroying the serious pollutants rather than just converting them to even worse types of chemical emissions.

Just to be clear. I do not care what anyone uses for fuel. It is simply their choice. If used oil is going to present a lot of carbon buildup inside the combustion space. I might also consider installing a simple water injection system to periodically clean it out.

It is logical that you may benifit by moving the timing a little past the recommended advance. The flame front is probably slower on that fuel.