Re: 56 Pat Spark Plugs/points

Posted by Bowman Davis On 2009/10/22 12:10:14

Packardv8, I agree with your idea about the fuel. Just prior to this problem I was using reg 87 unleaded fuel and it seemed to be running okay except I had some hesitation on acceleration so I put in 5 gallons of 89 octane and also added some octane booster to see if that would help. I was going to retime the engine but first I wanted to make sure the plugs,wires and points were correct. The Auto lite 57 plugs have been working fine so I'll retime using them to see if I can get rid of the detonation issue. I did a dry compression (got 150# +/- 3 to 4#)in all cylinders,and vacuum test of 22inches. So that seems to indicate the internals are okay.

JW, The Packard manual calls for Champion N-18 for the 56. I don't have a N-18 plug to check it against the others as to whether it is extended or not. I went online but couldn't find any information on the N-18 plug, but I'll keep trying. There has to be a cross refrence somewhere.