very nice. how much time did that represent? then again, you probably have much better (and more efficient) tools/equipment available to you than i do.



there should be pics of the last 12A i built floatng around here somewhere. i plan to start on a 13B soon. between being lazy and trying to sort my life out, i haven't made time to begin working yet.

 

The heavy parts in a piston engine go round and round, too. The light end of the rod and the pistons go up and down, but their travel is described by a sinusoidal wave and not anything jerky. If you've ever rode on a Scrambler type carnival ride, you've felt what it's like to be a piston except you get the accelerations in both directions.



Plus, the heavy rotating parts of a piston engine are much closer to the axis of rotation than in a rotary, so a gram out is much less critical.

 

You'll be surprised how many engine builders don't know that. Imagine a piston motor with the factory imbalance of a rotary. It would shake it self to death. Going round and round do have it advantages. The most noticable results from balancing are with a totally stock motor. It's so much smoother and very willing to pile up the revs.

On heavily modified ones your bearings will thank you.

 

Care to elabourate a bit on this? I was under the impression the rotating assy was very well balanced from the factory.



B

 

First couple engines I did I couldn't believe the difference, even the owners noticed.

 

lol, we've been amazed at our customers ability to hear the teeniest little noises from the steering wheel, it was so quiet, that with the engine running the average human cant hear it, yet totally ignore the flatspotted tires and bad wheel bearings.

 

Hmmm. After thinking about this, I think I'll start doing this on all of the motors I build from now on. I found a local place that'll do it decently cheap so it won't be much more in terms of overall cost to the customer. Thanks for the suggestion, Crispeed. I guess I was wrong in what I had assumed based on what some others had told me.



B

 

Pardon for bringing up a dead thread (and this is my first post here btw) but...

I was wondering what you guys do when balancing your motors. I will be putting together a new motor and want to do this, or send them out to be balanced.



I was wondering mostly weather it is just as simple as balancing the two rotors equally together, or another system that actually would balance the tips of the rotors. Just curious.



Oh, and I almost forgot wouldn't polishing the faces of the rotors "TECHNICALLY" aid in keeping some of the heat in the combustion chamber and away from the oil. This I would assume would help with detonation as well, but that's just an assumption.



dpf22

 

It looks real cool, too!

 

If lower oil temperatures is what you're after you're going to see far better results with coatings. We also offer the balancing service.