Hi Anyone

This is likely to have been covered before, if so just point me to the correct thread or forum. I assume some of it will also be in the engines accompanying instructions. I'm waiting on an OS 50 SX-H ringed Hyper engine to arrive on the courier and have the following questions.

1. What is the best way to run it in, on the bench or in the heli, or doesn't it really matter? It seems to make more sense to me to have the engine run in and reliable before trial flying a new heli.
2. How many average sized tanks is enough to be called "run in"?
3. What is the ideal fuel/lubricant mixture for running in and is there any special additive or lubicant that should be used with running in?
4. I understand that the amount of lubricant in a heli engine is a slightly higher % than in a plane because extra lubricant is required in the combustion chamber etc to offset the reduced airflow experienced around the cylinder head in a helicopter (I would have thought there are plenty of enclosed cowls on planes that would also have reduced cool air flow). Is that higher % enough to cause all of the extra exhaust smoke or is there something else peculiar about heli engines that contributes to the extra smoke?

Cheers in advance

David

Where's the popcorn?

The engine will come with specific instructions on how to run in the engine.

FBD.

Thanks for the sensible response FBD

....well....usually when the debate about breaking-in engines starts, it can turn into
a circus side show. The fuel and other recommendations will run from soup to nuts.

FBD.

dwilmot-

Yes, the smoke is mostly from the higher oil content in heli engines. Just follow the fuel recommendations for break in. This is a ringed engine. The 50SX is a pretty good engine but that was discontinued. It should be run a bit rich at first, but not excessively. A tank or two should be enough for you to get a sense of it settling in and getting smoother. Just follow the instructions and you'll be okay. If you have any more questions, ask them here.