Point setting 46 B JD

[Bill Gellert]

This year make model calls for a Wyco magneto with a .015 point gap setting. The tracktor I purchased has a Delco Distributor. I have this distributor type on a 50 and it can be used as a replacemnt for the Wyco distributor in this model. The spec for the point gap setting is .022 for the delco distributor. Should I set the point gap for the delco distributor on the B at .022 or what?

 

[John T]

Thought I already answered this somewhere??

You set the points gap FOR THE IGNITION SYSTEM YOU ARE USING (i.e. if a Delco Distributor its recommended gap) NOTTTTTT what the tractor originally used. Many older Wico Mags used a points gap of 0.015 while Delco Distributors were more like 0.022 or so.

If its got a Delco Distributor thats what the points are set to match NOT a Wico Magneto

John T

 

[Bill Gellert]

That"s what I thought. Thanks John for confirming!

 

[Carlyle hoffman]

And another way to look at it. I have a 40 crawler, and a JD60. Both have DELCO, and neither will operate effectively set at 22. The 60 , plows great at about 18-19 and starts with a snap, winter or summer. NO POWER at 22 SETTING, NONE and excessive spark knock. The crawler will not even start at 22, runs very nice at 17 - 18. Comments, i surly don't know.

 

[Bill Gellert]

Thanks for the advise. Before I changed the points, I didn't check to see where they were at. They were tighter than .022. When set at .022, it runs like crap. I'll try something in between.

 

[toot]

Here"s a question I couldnt answer the other day. I have a friend that owns an A with a Wico C mag. His coil was becoming weak so he put a external Car coil to power it. It seems to work fine, starts better, runs better than it was, but his question was should he leave the point setting at .015 or increase it to distributor settings now.. such as .022 Opinions?

 

[Carlyle hoffman]

It still *knows* it is a MAG, you only changed the COIL>

 

[teddy52food]

The wider gap fires earlier. Also closes later so coil has less time to get fully saturated.

 

[John T]

I CAN answer that question, you gotta listen now;

The Wico 0.015 gap IS ONLY AN APPROXIMATION its NOT the absolute best final answer. The deal is when the rotors magnet just leaves the field poles and is 0.090 away/outside from them, THATS THE MAXIMUM CURRENT flowing through the coils LV primary (regardless if internal or external coil). Thats called the edge gap setting and is superior to using the 0.015 gap. If all is new and in spec when the points are at 0.015 thats when the rotor is just 0.090 outside the field poles and when coil current is at max when the points just break open

Soooooooo regardless if its the internal or an external coil you would still set the edge gap to 0.090 (best and primary method) or the points gap to 0.015 (secondary method that approximates the 0.090 edge gap)

I spend like 15 minutes on that in my Wico Seminars and Workshops but cant cover it in a few paragraphs here but thats the bottom line

John T

 

[John T]

If all is new and in spec Delco recommends around the 0.022 points gap HOWEVER as things wear and the bushings wear and theres shaft wobble and other mechanical problems happen THE POINTS GAP WHERE SHE RUNS BEST CAN CHANGE

THAT NOT THE SAME AS THE DIFFERENCE WHEN USING A WICO MAG (0.015 gap) VERSUS A DELCO DISTRIBUTOR (0.022 gap). YOU USE THE SETTINGS FOR WHAT IGNITION YOU HAVE AND MAKE SLIGHTS ADJUSTMENTS TO ACCOUNT FOR WEAR

John T