| sbishop1806 | -- 03-03-2013 @ 1:55 PM |
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I have a 53 Monterey with an 8BA flathead. I would like to find out what the advance curve looks like. I was heating up on the freeway at normal speeds and level road. I got off the freeway and took side streets home and the temperature came back to normal. Checking the advance I was 8 degrees BTDC at idle. At higher RPM the advance went to 32 degrees I put a stronger spring in the heaver side of the distributor and the heating at normal freeway speeds went away. Now it only overheats on steep grades. I had the radiator cleaned. In order to troubleshoot further, I would like to know the advance curve. Stan Bishop
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| TomO | -- 03-04-2013 @ 6:26 AM |
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Stan, Here is a link to the information that you requested. http://www.secondchancegarage.com/public/422.cfm The Loadamatic distributors should be adjusted on a distributor machine, as you cannot get the specified vacuum readings on the car. Make sure that you have the correct 1953 Holley carburetor on your car as it could also affect the advance curve, Tom
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| supereal | -- 03-04-2013 @ 9:00 AM |
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As Tom has said, it requires a machin to accurately check and adjust distibutor timing. If you are using a timng light, or reinstalling the unit, be sure that the #1 cylinder (first one on the passenger side) is at the top of the compresion stroke, and the distributor rotor is pointing at he #1 cylinder contact. You then rotate the distributor body until the points just open to get initial advance. The timing light should show 0 advance at 200 rpm, and a maximum of 1 degree at 500 engine rpm. At 1000, min and max readings are 5.2 and 6,2 with vacuum of 1.32. At 1500, 8 1/4 to 10, vac 2.85, at 1500 rpm, 8 3/4-10 2.85 vac. At 2000rpm, 10-11 1/4, 3.7 vac. For your engine, the Holley carb draws the vacuum from a port above the throttle plate. Pure manifold vacuum could account for the exceptionally high advance you mention. AS you have changed the springs, it is important that the distributor be setup on a macnhine.
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| 37RAGTOPMAN | -- 03-06-2013 @ 3:57 PM |
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While you are checking things, I would also check for any backlash in the Distributer gears and also the Timing gears,dist cam bush.,and also make sure there is no blockage in the vacuum line,it might be rare but it does happen, my 3 cents 37RAGTOPMAN
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