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Paging Dr. Allis - D-17 Tune up specifications

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Clay View Drop Down
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Joined: 11 Sep 2009
Location: Udall, Kansas
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Topic: Paging Dr. Allis - D-17 Tune up specifications
    Posted: 26 Jun 2011 at 11:31am
Dr. Allis
What are the tune up specifications for a 1962 D-17?
Dwell ____-_____
Spark Plug Gap _________
Timing ____ deg. BTDC
Point Gap _______

I am installing a new set of AC45XL spark plugs.

Thanks in advance.
Clay
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2011 at 12:11pm
I gap plugs at .025"....points at .020".....valves at .015" cold int&ex....timing is 25 degrees BTDC at full throttle.
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Clay View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2011 at 1:15pm
Thanks Dr. Allis.
Would you happen to know  the Dwell?  I can not find it in any of the literature I have on hand.
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Gary in Texas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary in Texas Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2011 at 2:19pm
 Clay
 The point gap and dwell kind of go hand in hand
 

The dwell is adjusted by setting the points gap to a specified distance at maximum opening. A narrower gap gives more dwell and a wider gap gives less. Taking it to extremes, excessive dwell means that the points close too soon after opening, cutting off the magnetic field collapse before it delivers all its energy. Too little dwell gives the magnetic flux insufficient time to build up to the maximum.

Both conditions give a weak spark which gets even weaker as the engine RPM rises and produces misfiring at normal operating speeds. The dwell, as well as spark plug gap, do have an effect on ignition timing. The later the points open, the later the spark comes and retards the timing. The earlier the points open the sooner the spark comes and advances the timing. That is why timing is the last thing to be set in a tune-up.

Don't know if this helps or not.
 
Gary in Texas
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Ed (Ont) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed (Ont) Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2011 at 3:40pm
The dwell on a 4 cyl usually ends up at around 45 degrees if the points are correctly set but as the others have said more important to get points as accurate as possible. Also check that the dist shaft does not have a whole bunch of endplay.
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Brian Jasper co. Ia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2011 at 8:33pm
I should see what the pertronix ignitor modules run for dwell. I'm pretty sure dwell being 30 degrees for GM V8 engines at idle and it changed with speed. When the HEI came out, dwell was fixed at 40 degrees. Been a long time since I've worked on anything with points other than a small engine...
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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