In other sports involving Gas powered motors, there are usually a number of aftermarket vendors that will develop and offer improvements to enhance the performance of a given motor.
Things like Porting and Polishing.
I wonder why we don't see anything like that for the motors we use in competition.
3W offers a competition version of some of their motors. Seems like other manufacturers would do the same. Just wondering.

Originally Posted by Flybye Steve

In other sports involving Gas powered motors, there are usually a number of aftermarket vendors that will develop and offer improvements to enhance the performance of a given motor.
Things like Porting and Polishing.
I wonder why we don't see anything like that for the motors we use in competition.
3W offers a competition version of some of their motors. Seems like other manufacturers would do the same. Just wondering.

In many forms of motorsports, we are limited to certain cubic inch limits or a certain engine design. The only way to increase performance is to modify the existing design within the limits of the rules. Not so in our RC sport. If we don't have enough performance for a certain airplane, in most cases we can just buy a larger engine or one that has more performance. People don't usually pay to have an inferior engine modified at a high price when something is available off the shelf that will do the job just fine. In other words, its a cost issue.

Look around a bit.. http://zenoahmodifiedengines.com/g62-aircraft.php

I have one of these i picked up at an estate sale for a really good price. Haven't run it yet but they are supposed to really turn up. But when you add it up. 450 for a g62 plus 325 to tune it up.. You could just bolt up a da 85 and go fly..So unless you are in a g62 race class it probably is not worth messing with.

Originally Posted by Flybye Steve

In other sports involving Gas powered motors, there are usually a number of aftermarket vendors that will develop and offer improvements to enhance the performance of a given motor.
Things like Porting and Polishing.
I wonder why we don't see anything like that for the motors we use in competition.
3W offers a competition version of some of their motors. Seems like other manufacturers would do the same. Just wondering.

You can see it in Car and Buggy RC such as RB innovation , Daves discount motors because it also is a better fit for the application. The best example of what you are looking for in model aircraft engines is done by the MFG. That example would be YS engines but they do not offer up a gasser as of yet. The closest high tech rendition they have is the 185 DZ Zero CDI.

Originally Posted by Flybye Steve

In other sports involving Gas powered motors, there are usually a number of aftermarket vendors that will develop and offer improvements to enhance the performance of a given motor.
Things like Porting and Polishing.
I wonder why we don't see anything like that for the motors we use in competition.
3W offers a competition version of some of their motors. Seems like other manufacturers would do the same. Just wondering.

8 years ago or so there was a guy that would take your DA 150 and modify it where it ended up being much smoother, better throttle response , and better top end. I had a few done and they were much better engines when done. The company was called SALA, but can't remember the guys name.

Used sala motors sell well on the 2nd hand market too.

"most" 2 stroke engine modifications end up moving power higher in the RPM range. Not something we really want for large props and aerobatics. The differences are minimal also at lower rpms that we turn. The best mod is a tuned pipe.

Interesting comments. Great input. Thanks

Originally Posted by KoleDeRacer

"most" 2 stroke engine modifications end up moving power higher in the RPM range. Not something we really want for large props and aerobatics. The differences are minimal also at lower rpms that we turn. The best mod is a tuned pipe.

Exactly what I was thinking....

Another thought regarding other motorsports is the fact they have transmissions, are able to operate the engine within a narrow(er) power band that the engine is set up to operate within.....

Last, our friendly, easy to start/tune engines that seldom need adjusting, turn into picky primadonnas that demand MUCH more attention to get them running as designed.

Yes they do. I have a few like this.

With 2 strokes they really work well with tuned exhaust. The problem is with that. What we currently have works well for our weight restrictions we look at but look at similar sized or smaller dirt bike 2 strokes and the power they make. However their pipes huge and heavy. Not good for us.

Originally Posted by jamesrxx951

With 2 strokes they really work well with tuned exhaust. The problem is with that. What we currently have works well for our weight restrictions we look at but look at similar sized or smaller dirt bike 2 strokes and the power they make. However their pipes huge and heavy. Not good for us.

Thats not really the issue though. Have you ever ridden a kx65 the power is a light switch that starts at 9k rpm. Thats the reason for the short fat pipes. Our pipes are actually very suited for the application.

A tune pipe( basically) stops the exiting of the new raw fuel charge from the transfers out the exhaust..If you get it done with the porting then there is no need for the pipe. It just hasn’t happened yet. Its getting better, but a well tuned pipe always seems to be a benefit

Originally Posted by FLYMAN022

A tune pipe basically stops the exiting of the new raw fuel charge from the transfers out the exhaust..If you get it done with the porting then there is no need for the pipe. It just hasn’t happened yet. Its getting better, but a well tuned pipe always seems to be a benefit

To a point. But that extra raw fuel and fresh air that enters the tuned pipe is forced back into the cyl from a reverse pressure wave at the end of the pipe. This mixture that goes back into the cyl is like a super charging affect.

Originally Posted by KoleDeRacer

Thats not really the issue though. Have you ever ridden a kx65 the power is a light switch that starts at 9k rpm. Thats the reason for the short fat pipes. Our pipes are actually very suited for the application.

Nothing that small but 125's, 250's and 350's. And you are 100% correct in most dirt bike applications the power is like. Light switch. Even though there are some pipes out there for low end power mid range. But if I remember correctly 125 dirt bike engines are in the 20-30 hp range while ours in that size just over 10.