12
« on: January 23, 2011, 17:45:08 »
Lew,
Good to hear the Aceca is moving. I did some work on ignition advance sometime back.
Background: I was taught by racing engine builders to set timing at the MAX advance. Setting at idle is not accurate. With radial cams and cam timing, the idle is too lumpy to get an accurate reading. Most engines like 30-35 BTDC at full centrifugal advance. Usually all the centrifugal advance is in by 3000 rpm.
On to the Bristol 100D2: I set it at 35 BTDC at full advance and the engine ran terrible. No power, ran hot. I advanced it further and found 50-55 was good. It seems way too much and I thought something was mismarked. In 2007, I rebuilt the engine, used a degree wheel that confirmed the timing marks. I also extended the scale on the flywheel. I believe every tooth on the file is 1.5 degrees. I can double check if you want.
By the way, how did a Mallory twin point get installed? Did the whole distributor get changed or did the fit the point plate inside the Lucas distributor?
Peter