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Dynamic timing


Rrc19933

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Hello

i just saw that the engine on an 1993 rrc that the engine is 36D with different ratio than the previous one. I just don’t know the dynamic timing degrees to set it to. Does any one have an idea on how many degrees should it be. The engine is a 3.9. Any test that I should do to know the optimum degrees?

Thank you

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Pointer is the rotor arm? I have used a strobe to see the degrees and it was far away before TDC. I want to adjust it to the correct degrees depending on the engine that i have 36D. It was running perfectly but i have removed the distributor without marking it. I know it was wrong but let us consider that I’ve checked it and had to adjust it. I’ve searched and found many answers some say 4 degrees BTDC others 6-8. When i change the degrees the idle rom changes and i read that it should be between 500-550rpm. Mine is around 650-700. I can also change the rpm from the air intake. so I’m pretty lost. Just want to do it right for maximum power and best fuel consumption. Also I suspect that the reference plate of the TDC is tilted a litte to the left side.

Thank you

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As above, make sure the pointer is in the right place first,or you are shooting in the dark. Easiest way to do this is with a piston stop, it has been covered on here, do a search.

Then, most V8s will tolerate 9 deg btdc on modern fuel.

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