View Single Post
  #38  
Old March 31st, 2016, 04:45 PM
George Bongert George Bongert is offline
Senior Member
 
Join Date: Jan 2013
Location: Oshkosh Wisconsin
Truck: Former owner Repowered by GMC 305 V-6, 1963 Chevy 30 Series SM420 Long Bed (9') Step/Fenderside
Posts: 210
Rep Power: 141
George Bongert will become famous soon enoughGeorge Bongert will become famous soon enoughGeorge Bongert will become famous soon enough
Default Re: Too much timing?

Greetings Clarke!

16 degrees BTDC (Before Top Dead Center) initial ignition timing is a bit too much in my opinion. I would set the timing to factory spec, and run the vacuum advance with full intake manifold vacuum. That will be where you will get your best performance. You will lose power with ignition timing that is too far ahead as well as with timing that is too late. It will interest you to note that ignition timing that is too late (retarded) will contribute to engine overheating problems. That is why the people who designed the engine designated that the initial ignition timing be just so many degrees (factory spec) BTDC.
Reply With Quote