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By MoonShadow - 17 Years Ago
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I recently took my distributor out, put it on the machine and set the dwell to 28deg. Now when driving I get pinging during acceleration. I've moved the timing from 12 deg advance to several lower setting but it dosen't change. Still pings! Any Ideas? Maybe just some low octane gas? Chuck in NH
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By Hoosier Hurricane - 17 Years Ago
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Chuck: I assume it didn't ping before you R&R'd the distributor. Did you change the gas while the distributor was out? If not, it isn't the gas. Did you mess with the advance curve while the distributor was on your new machine? Only other thing I can think of is a slipped damper ring so the timing marks are lying to you. John
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By MoonShadow - 17 Years Ago
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John, In all the years and combinations I've had in the Vicky I never heard a ping. I know thats odd since I haven't been real choosy about fuel. I didn't make any changes to the advance curve and the damper appears to be dead on. The dampner was a NOS unit and looks good. I'll try timing without the light and see what I get. I did fill up with fuel on the way home before the distributor came out. The idle is a steady and vacume is 16lbs at about 850RPM but the Holley 600 idle circuits are screwed almost all the way in. Maybe 1/2 turn out. Usually required 2.5 turns to idle correctly. It had burnt points in it and was making the car very hard to start. I also had to put a new solenoid on due to over cranking. I don't know why but I always seem to get the wierd puzzles! Chuck in NH
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By charliemccraney - 17 Years Ago
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Did the vacuum change since adjusting the dwell? Maybe it now has more vacuum advance.
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By MoonShadow - 17 Years Ago
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The distributor is a Mallory single point with mechanical advance only. I didn't make any internal adjustments to it. On the machine it showed 18deg maximum advance. The only thing I did was clean up the points and set the dwell. I did put a squirt of oil in while I was at it. When I started it today I noticed a little putt(?) occasionaly out of the right bank. I'll triple check the wires. Aren't their a couple that could be swapped with minimum affect? I'm also concerned about the change in the carb vacume adjustment. I used to have them about 2.5 to 3 turns out. Now only about 1/2 turn. Vacume is at 16 and smooth. Previously it hung around 14. Throttle plate appears to close properly. Chuck in NH
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By GREENBIRD56 - 17 Years Ago
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Chuck - Are you talking about 18° distributor advance - or advance at the crank?
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By John F - 17 Years Ago
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Chuck, I assume you are setting the initial timing @ 12 BTDC and the distributor has 18 degrees of mechanical advance. When you had the distributor on the machine at what RPM was all of the advance in by?
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By charliemccraney - 17 Years Ago
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Perhaps lubing it has made it so that the advance comes in faster - less friction to fight with.
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By MoonShadow - 17 Years Ago
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18deg at the distributor. I didn't make a note of the exact rpm when it all came in. Seems like 2500-3000rpm. Same dizzy didn't ping before. Chuck in NH
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By GREENBIRD56 - 17 Years Ago
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Chuck - You must have had something stuck before? The mechanical advance could have been hanging up or something. Or very low initial advance setting. 18° (distributor) x 2 = 36° at the crank + 12° initial = 48°.....which is a bit too much - needs to be 36°/38° total 2500 -3000 rpm crank revs or distributor revs? this would be OK for crank revs a typical curve is: 10°/12° initial + 26° (13° distributor) all in at 2500 rpm (crank)
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By MoonShadow - 17 Years Ago
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Steve, I was wondering if oil in the little tube freed up the advance and brought more of it in. I not sure about the RPM. The distributor was in an ALLEN Syncrograph machine when I set the points. So I guess that would be distributor RPM. I've tried the initial timing at 2 and 4 deg with no change. Still pings under acceleration. The performance of the car changes a bit but not the ping. I've tried the timing very low but it makes the starter drag. Maybe I just need to change the distributor again. I have a Mallory Electronic unit and MSD 6BTM. I thought I was having a problem with them in Columbus. But apparently it was a defective coil. More tomorrow. Chuck in NH Also I just remembered, when I set the blower cam up I set it at 8deg initial advance. Would that make 20 at the crank instead of 12? I had it at 0 before but am thinking about pulling it back to 4 deg.
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