Re: PACKARD 160 TUNE-UP DATA

Posted by auto.nut On 2020/7/27 20:23:56

Appreciate your message & knowledge. You say my vacuum @ 500rpm is low. What could cause this? Could timing cause it? I still have not checked the timing because not sure what criteria to use. If I check the timing @ 500rpm what mark on the balancer should it be on? One source I looked at, states 4 marks before TDC. Isn't that kind of retarded when most more modern engines are more advanced before TDC?

I notice that when I increase the idling to around 800 or 1000, the tack pointer really jumps around. Is that normal? I believe it is because the high speed part of the carb is trying to cut in, but it sure isn't doing it very evenly. What could be the cause of this or is this normal? The tach is steady when I reduce down to 500rpm.
Lee