I'm beginning to fit the crankshaft in my '14 touring's engine, afterwards I'm taking it back out to balance it. I have a opportunity to purchase a original set of Dunn weights, and I'm quite intrigued by the idea. I'm just doing a refresh on this engine, the main bearings are in good shape with no real wear in the second main. I'm doing a hone and rering with the original cast iron pistons as well.
In the little research I've done, it seems like there is a "love/hate" relationship going with them. If they do actually "lend a hand" on taking some of the stress of the crankshaft, I'm interested in going to the trouble of fitting them and then doing balancing them.
What are your guys's thoughts and experiences? And what are weights like these worth in todays market?
Thank you, and Merry Christmas!!
Dylan, I added a set of Dunn's 25 years ago and haven't broken a crank yet. First, I "balanced" them using a postal scale. Later, I did a "rebuild" and took the crank to a balance shop. When I picked it up some 2 weeks later the weights looked like swiss cheese. there were holes all over them. So, if you use um be sure to get them balanced on the crank. It does make the engine run smoother but it will still shake-rattle and roll....
Hmmm, cool! I'm not expecting it to run like my Studebaker, but some improvement would be nice. It's half tempting to not even bother; haha!
You will get some forum members recent opinions and maybe even an offer to buy them at:
Thanks Jim! The person that owns the ones I'm looking at; doesn't know what they are worth in todays market. Trying to find out to make a offer.
Dylan, I recently fixed an engine that came in with a bad vibration, I pulled it down to find the Dunn's weight's in it, I have always wondered if they worked or not? I had this one spun balanced to cure it. I got it back together and it sounds great at idle 1/4 ok, 1/3 ok, then 1/2 throttle the harmonic vibration starts, after 1/2 it smooths back out. Well the weights are now cut off of the crank since they where welded on. This engine has been a pain in the ass, I do not know who built it and do not care but I have never had any issues like this with out the Dunn's, so all I have to say is good luck on the ideal!
I believe there was a somewhat famous former member of the forum from FL that tried the weights with no success.
Yup,and you have to have the weights that fit whatever shape crankshaft you have.Bud.
Here's the past thread the photos above came from.
Thanks for the suggestions guys! I'm starting to reconsider the idea, I think I may be trying to make the old T too much of a modern engine.