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How do dial back timing guns work?
https://slantsix.org/forum/viewtopic.php?t=15811		 Page 1 of 1
Author:  Reed [ Wed Jan 18, 2006 11:48 am ]
Post subject:  How do dial back timing guns work?
I got my new e-Bay dial back timing light in the mail yesterday (yay), but it didn't come with instructions. It has the dial on the back for advance degrees, but how do I use this on the car? I know how to hook it up, but how do I use the dial back fuction?

THanks!
Author:  Pierre [ Wed Jan 18, 2006 11:51 am ]
Post subject: 
If the dial is set to 0, then its read just like any normal timing light. When mark is seen at 0deg mark on timing mark tab, engine is at 0 degrees advance.

When the dial is set to, say 5deg, and the mark is at 0deg on the timing mark tab, engine is at 5 deg advance. 10 deg on the dial, mark at 0 on engine, 10 degrees advanced, etc
Author:  Eric W [ Thu Jan 19, 2006 12:25 am ]
Post subject: 
Yep. If you want to set the initial timing set to 10BTDC, turn the dial to 10. Rotate the distributer until the timing mark lines up to 0. Tighten up distributer and there you go. To check total timing, turn dial to where you want it (32 degrees for example) and rev up engine to where ever it stops advancing. Adjust timing as needed to get desired total. Again, when you get it right, the timing mark on the balencer will line up with 0 on the tab on the timing chain cover. Have fun!
Author:  Reed [ Thu Jan 19, 2006 8:28 am ]
Post subject: 
Okay, sounds simple enough. I just can't make the connection of how the timing guns knows when the engine is at the specified degree of advance. It seems like the gun would need an internal tachometer and would need to know the number of cylinders. As long as it works I don't care, I just don't get how it works.

Anyway, thanks for the instructions! :D
Author:  dakight [ Thu Jan 19, 2006 10:17 am ]
Post subject: 
Every time the light is triggered the engine has rotated 360 degrees. A fairly simple timing circuit would be all that is needed to complete the puzzle.
Author:  emsvitil [ Thu Jan 19, 2006 1:37 pm ]
Post subject: 
Quote:
Every time the light is triggered the engine has rotated 360 degrees. A fairly simple timing circuit would be all that is needed to complete the puzzle.

Where did you get the 2-stroke engine????????? :roll:


It's actually 720 degrees. :lol:
Author:  dakight [ Thu Jan 19, 2006 1:41 pm ]
Post subject: 
Quote:
Where did you get the 2-stroke engine????????? :roll:


It's actually 720 degrees. :lol:
What. doesn't everyone run a Saab engine?
You're correct... but it's still the same principle.
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