The Ford Barn

RHD · 12-18-2012, 10:51 PM

Spark And Throttle Levers.
Spark Lever.
If all linkages to the distributor are perfect with no play, how many degrees of movement is one click of the lever? What would the total range be?
Throttle Lever.
Similarly with the throttle lever, what would one expect in revs with one click?

Jim/GA · 12-19-2012, 12:48 AM

Les-
Full movement of the spark rod is 40 crank degrees (20 cam degrees). You can count clicks and divide.

At idle (no load) one click of the throttle rod will be a lot of RPM change, not predictable from engine to engine.

John LaVoy · 12-19-2012, 10:47 AM

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According to NuRex information one click of advance is equal to 4 degrees of advance.

12-18-2012, 10:51 PM	#1
RHD Senior Member Join Date: Jan 2011 Location: New Zealand Posts: 665	Spark And Throttle Levers. Spark And Throttle Levers. Spark Lever. If all linkages to the distributor are perfect with no play, how many degrees of movement is one click of the lever? What would the total range be? Throttle Lever. Similarly with the throttle lever, what would one expect in revs with one click? __________________ R.H.D. Author of Model 'A' Ford technical manuals. Supplier of good original RHD parts.

12-19-2012, 12:48 AM	#2
Jim/GA Senior Member Join Date: May 2010 Location: Young Harris, GA Posts: 1,819	Re: Spark And Throttle Levers. Les- Full movement of the spark rod is 40 crank degrees (20 cam degrees). You can count clicks and divide. At idle (no load) one click of the throttle rod will be a lot of RPM change, not predictable from engine to engine. __________________ Jim Cannon Former MAFCA Technical Director "Have a Model A day!" Last edited by Jim/TX; 12-19-2012 at 11:42 AM.

12-19-2012, 10:47 AM	#3
John LaVoy Senior Member Join Date: May 2010 Location: Rocklin, CA Posts: 1,219	Re: Spark And Throttle Levers. Sponsored Links (Register now to hide all advertisements) According to NuRex information one click of advance is equal to 4 degrees of advance.