Quote:
Originally Posted by Diesel911
About 6 or so Months ago I finally got around to Drip Timing my IP and set it at aroximately 28 degrees BTDC.
I ended up with undesirable Nailing.
I had to retard the timing some to reduce the Nailing.
Up until I advanced the Timing I did not think advancing the timing could cause Nailing. I thought it was only Late Timing that did that.
I guess you have to find the "sweet spot" for each vehicle when it comes to timing.
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Here is my theory....
only a theory.......With advanced timing you could be getting a similar effect to 'pre-ignition' in a gasoline engine which could be confused with 'Nailing'. What I mean by 'pre-ignition' here is the explosive force being presented to the piston when it is still in the up stroke. I would expect it would also be characterized by roughness, vibration, and poor MPG.