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engine rotation

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From what I heard they can run either way!! Was told this when i bought my plane.
 
Although it is possible to get a nitro car engine to run backwards, it would run very poorly and may damage the engine. They are designed to run in one direction only, and that is counterclockwise.
 
It may run poor but I don't think it would damage the engine, maybe the one-way bearing for a pull start though. It could also cause the flywheel nut to fall off.

I did have my pull-start motor start backwards on me once. Imagine my surprise when I hit the throttle and the car flew backwards into the curb!:OMG:
 
I think airplane engines may run backwards...but arent they built diffrent? The RC car/truck engines are definitely designed to spin one-way only. Ask any engine company. I might just email O.S. engines.:hehe:
[move]-Kellen[/move]
 
2 stroke airplane engines will sorta run backwards, but they spit fuel out the carb. It's the port timings that are off. K&B engines made a CW crank for some of their engines so you could make scale multi-engine planes fly right. But, why would you want a car engine to run backwards?

SHK, airplane engines and car engines are fundamentally the same, car engines just run at higher RPM and temps.
 
I learned the hard way that the engine will run backwards... I do believe it damaged my Brand New mill. It runs like crap & seems sluggish...
 
I think we established this but the nitro engines run counter clockwise. I just bought a starter box for my NTC3 and I had to figure out which way the flywheel goes so I could make sure the doughnut would go the otherway to spin the flywheel correctly.

Now I am sure you can get an engine to move clockwise by hand, but how do you get it to actually run clockwise. I would think this is impossible to do.
 
Originally posted by error401
SHK, airplane engines and car engines are fundamentally the same, car engines just run at higher RPM and temps.
Click to expand...

error401, most 2-strokes are the same If you ever decide on looking at one and taking it apart. Things that may differ is how they are laid out and the carbs and the fuel systems.
[move]-Kellen[/move]
 
Yeah, I have taken them apart, replaced bearings, pistons, sleves, etc. 2 stroke and 4. Try doing a valve job on a YS .91 AC sometime, makes a 2 stroke seem simple. Also the heads are different. My original point about the rpms and temps was that aircraft engines are not designed to run at 275 and 35000 rpms (unless it's a ducted fan). I have a Czeck MVVS 40 that sounds like it's gonna blow up at 18000 rmp (which is the max rated rpm for that engine). If you do the math on props and rpms, you can easily cause the tip speed to exceed the sound barrier well below 20K rpm.

But getting back to the point, all 2 stroke engines are fundamentally the same in operation. The crank is a rotary induction valve, the case is a pump and the intake/exhause ports on the cylinder are the outlets. The timings required to properly operate a 2 stroke engine dictate that it must run CCW (unless it has a CW crank). It will run backwards, just not real well, and will not develope any HP. That was what I was getting at. I do know engines, cause I've screwed with them for years.
 

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