Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Distributor Tuning and Theory - Part 1
View Single Post
  #13 (permalink)  
Old 03-07-2005, 04:22 AM
TurboS10's Avatar
TurboS10 TurboS10 is offline
Registered User
Last wiki edit: Auto Terms and Definitions Used in Modern Engine T...
Join Date: Sep 2002
Location: Texas
Age: 42
Posts: 3,441
Wiki Edits: 2

Thanks: 0
Thanked 1 Time in 1 Post
Not shade tree at all. What you have to understand is that the mechanical advance and the vacuum advance over lap. The time you will here ping is at part load and WOT transition. The reason is because as the engine accelerates mechanical advance is advancing the timing, and at the same time vacuum advance is retarding it back down. If the springs are too light, the mechanical advance will come in too quickly and you will hear pinging. At this point, you go back one set of springs just like accel said.

Reply With Quote