Date registered: Nov 2008
Vehicle: 1981 300TD 310k--1966 230 165k--1970 280se 172k
Location: Ohio City, Ohio
Mentioned: 1 Post(s)
Quoted: 36 Post(s)
Fintail Ignition Tuning
Before I figure out what's wrong with my carburetors, I want to be sure the ignition is up to snuff. 1966 230 with the 180.945 engine. I see the timing spec in the owners manual says "approx. 2 degrees UDC." However, the service manual has an assembly setting stating "Stroboscope check at starter speed and with spark plugs installed 3 degrees BTDC". Then there is also a table for "Ignition setting and stroboscope values at engine speed" and lists a range of degrees at various RPMs. The text says to check it at 4500 RPM without vacuum. That setting is listed as 37 degrees.
First of all, is UDC the same as BTDC?
Secondly, is there really 37 degrees of advance at 4500 PRM? Seems like a lot. What do you guys recommend? Just set it at 2-3 degrees BTDC at starter speed and then check it at 4500 RPM?
Also, is the table with "Closure angle" the same as dwell?
Forgive me, I am more familiar with diesels and it's been many years since I tuned up a gasser. What's more important, dwell or gap? Doesn't one affect the other?
1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
Last edited by carpenterman; 11-06-2010 at 06:22 PM.
Reason: add pictures