Packard Forum Index » Post-War (1946-54)

I was concerned that the vacuum dwell on my 51 200 might not be working correctly, so I put my dwell meter on it. At idle, it reads 30 degrees of dwell. Reving up the engine, the dwell goes to 25 degrees and stays steady. Is this correct? And if it isn't, what do I need to do to correct it? I've never had the vacuum dwell unit rebuilt. thanks

The vacuum advance should not change the dwell, only the timing. The small change you see is not significant and probably due to a little wobble or free play in the movement of the breaker plate to the base plate.