View Full Version : Timing=UDC?

03-26-2012, 09:19 PM
I know what TDC is, and I know what BTDC and ATDC is. What is UDC?

I used the search and found that IGN is the 4* advanced or BTDC and that UDC is 0* TDC, but what does UDC stand for?

And then it looks like there is a mark that says "in OP1" whatdoes that mark on the damper mean?

03-26-2012, 09:22 PM
Upper Dead Center.

Dick Steinkamp
03-26-2012, 09:31 PM
in OP1 = intake on #1 cylinder opens

03-26-2012, 09:48 PM
I learn something everyday. Now if only I could remember past tomorrow.