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smallboregarage Chuck Kraeuter

Home Page: Chuck Kraeuter   USA
Portland, OR, USA

Total Posts: 26 Latest Post: 2018-03-26
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Week 17

Chuck Kraeuter   USA — Posted on The CycleKart Club
Tuesday January 9, 2018 11:02 PM


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Member Comments on Journal Entry: Week 17   ↵
2018-01-13 21:23:32 # 47801
Comment by Rick Eggers
Just curious. Did you re-balance the rotating assembling after lightening the crank?
2018-01-13 22:10:05 # 47803
Comment by Chuck Kraeuter
Thanks for the question, Rick. The answer is: not yet; I'm still a bit unclear on how singles are balanced. There is not a lot of metal in these engines, and probably not a lot of metallurgy either (It is impressive what you get though for under $100; I really don't know how they do it). I thought that I would see what I could remove. Then maybe look into where I should add.
2018-01-19 21:28:32 # 47975
Comment by Rick Eggers
There are some good websites that detail balancing motors. I built a b-day twin from scratch several years ago and I had no clue how to balance it. I found a website with a balance calculator. You just plug in all your weights (I used a small digital scale that reads out in tenths of a gram) and it tells you how much bob-weight to add for static balancing. It worked great.
2018-01-19 21:30:20 # 47976
Comment by Rick Eggers
I hate that damn auto correct. That's supposed to say V-twin.
2018-01-20 15:33:48 # 47989
Comment by Chuck Kraeuter
Thanks Rick, I'll look around the web a little more, and congrats on the v twin engine. I appreciate having another set of eyes on my project. My plan is to balance with 100% rotating weight and 50% reciprocating weight. My current understanding about singles is that they can't be entirely balanced and only the best compromise should be sought. Changing the balance factor from 50% can move the vibration to a different engine speed (must have something to do with the natural frequency of the assembly). I hope to experiment with it a little, and I'll let you know what I find out. Thanks again for your interest.
2018-01-20 17:39:47 # 47990
Comment by Rick Eggers
Here's the website that deals with v-twins.https://www.rbracing-rsr.com/balance2.html You might want to read it because it explains general engine balancing theory and I think is very informative. The calculator is for a twin however, but you might try plugging in your number and see what you get. After all, a v-twin only has one rod journal on the crank for both rods, so in that respect it's similar to a single. Also keep in mind that the cylinder inclination plays a part. A vertical cylinder engine would be balanced slightly different than a horizontal cylinder engine. Ours being at a 45 degree angle, I'm not sure what you do. There are plenty of websites to study. Here's another.http://www.neme-s.org/Model_Engineer_Files/2924-Balancing%20Single%20Cylinder%20Engines.pdfGood luck and keep us up to date on your progress.Rick
2018-01-20 23:05:22 # 47998
Comment by Chuck Kraeuter
Awesome, thanks

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