|
|
|
|
Original Message
|
| Timing advance |
| By Joel - 05/21/2002 4:32:25 PM; IP 12.27.46.140 |
| I have a stock 428cj/auto with a dual diaphragm advance unit. I've set the initial timing at 8 degrees BTDC. I set this at about 550 rpm in hopes of eliminating mechanical advance factor. That is about all the initial timing I can have before it will ping on a heavy load road test. I read else where that the vacuum advance unit should have a lot of vacuum at no load thus advancing the timing, and have no vacuum draw at WOT thus eliminating the vacuum advance. The advance portion of my advance unit is connected to a port on the thermostat housing. It has a vacuum draw when the motor is cold, but then drops to zero when the engine is warm. When I rev the throttle in the driveway with zero load, it has some vacuum draw, but then drops back to zero at idle. Is this correct? With the vacuum lines disconnected and plugged, I have about 30 degrees advance by 2500 rpm. I'm not sure if this is the total initial and mechanical advance because my timing light flickers out at about that speed. |
|
|
This thread, so far...
|
|
|
|
Post A Response
|
|
|
|
|
|