Scout Balance Factor

[canadianbiker099]

I am building a 1931 Scout engine. What balance factor works well with this engine? I am using the S&S balance tools.

[PaulCDF]

CB099
Now; Please understand I am NOT an engine builder; hoping others will chime in.
Best I can do is quote Professor Jim Mosher (60%)( hope that helps) and direct you to his site:
Indian Performance Bottom Ends (performanceindian.com)

[T. Cotten]

Here we go again, Folks..
(Please read all the way down to Herr Elvenkemper's experience.)

http://virtualindian.org/Flywheeltheory4.htm

We do not know what the original factor was for virtually any antique American motorcycle, and without back-calculating an unmolested assembly, we may never know.

But odds are an early Scout wasn't sixty. Good thing they are so forgiving.

....Cotten
PS: CB099!
Have you inspected the fit of the tapers on the S&S arbor to the wheels?

[canadianbiker099]

I made new ones to fit Indian tapers.

[T. Cotten]

I made new ones to fit Indian tapers.

Have you calculated your existing factor, CB099?

....Cotten

[canadianbiker099]

No, it came to me apart with new T&O flywheels.

[T. Cotten]

Rather than picking a completely arbitrary number out of thin air, CB,..

It might be best to get back to basics: "Hang" it with one piston assembly.

42 Quartermaster balancing2.jpg



....Cotten

[PaulCDF]

You can't go wrong listening to Cotten.

There is an interesting article on truing and balancing Indian Flywheels in the Club magazine archives: Sept/Oct 2015 issue pg 74-76
"Lessons Learned More Secrets for Rebuilding Old Machines" by George Yarocki. I say interesting as even after reading it is still pretty much "Greek" to me.
(Probably a re-read or two to three is in order).

[T. Cotten]

You can't go wrong listening to Cotten....

Sure you can, Paul.

Balancing is probably the most obfuscated topic of all, and I'm sure I've added to it somehow!

My back issues aren't in order; Did Mr. Yarocki put a number on 101s?

....Cotten

[PaulCDF]

Cotten;

On Balancing Mr. Yarocki mentions no specfic numbers.
He does use a set of rails of his own construction similar to the one you posted in #7 above.

He did state:
"Balancing is done using one piston, one wrist pin, two clips and one set of piston rings.
Drill holes equally in the outside of both flywheels at the heavy spot until the flywheels
will remain motionless in any spot."

BEFORE BALANCING He discusses Truing using a "Clamping method".

I was not able to link the article from the Archives to this post.

If you go to the AMCA home page
On the Right of the page is "Features"
Listed under features is AMCA Magazine Select this.

There is a Gray Box about 1/3 down the page on the Left (Archives AMCA Magazines) Select this.
You will need to log in if you have not already done so. NOTE AMCA Homepage log in is unique and
separate from Forum log in.

New Screen Appears.
On LEFT of page is Documents Folder with four options:
About(1)
Events(17)
Chapters(2)
Features(2)

Bottom Option "Features (2)" IS WHAT You want select "Features"
Now decades of past magazines appear: 2020s to 1960s.

Select 2010s

Mr Yarocki article appears
2015 Vol 54, Issue #5
(Sept/Oct) pg 74-76

[T. Cotten]

I appreciate your effort, Paul!

But after jumping through all the hoops twice, it still won't let me in: Refuses my email address for yet another password.

It would be easier to sort my magazines...

Getting into truing techniques would be endless.

,,,,Cotten

[PaulCDF]

Almost two years ago (June 2020) I was having similar problems logging onto the AMCA Homepage.
I was trying to access the Library. Mike Love directed me to:
Carlene Kronau carlene@clubexpress.com
As The Homepage and Forum have different moderators. She was able to help me. Hopefully
she is still around.

[T. Cotten]

I appreciate that you emailed me the article text direct, Paul!

Mr. Yarocki's Brown and Sharpe ruler 'rails' (or 'knife-edges') never showed up in the dumpsters, but some 12" planer blades did, which I had ground in tandem to a 1/16" face. Very sensitive, but then so is round stock!

If I had to bet on a number out of thin air, CanadianBiker,...
I'd consider that your motormountings are much more like a Chief than a Sport Scout, so all other things considered, the factor should be similar as well.

That's my narrative, and I'm sticking to it.

....Cotten

[canadianbiker099]

Thanks for the input guys. I think I will build a balancing tool like Indian recommended for this one.

[PaulCDF]

"build a balancing too"
CB099
I re-read Mr. Yarocki's article in the AMCA Sept/Oct 2015 issue. I am glad I did. Right at the start (probably while I was concentrating on my coffee) the author mentions some YouTube videos
with Mr. Yarocki that show balancing and his tool. Worth a look. Search YouTube for: "JAA1perin". Good Luck.