Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Finally located some Marvel Mystery Oil in Australia and its on its way to me.
Not cheap compared to what my U.S pards pay, but I hope its worth it.

What ratio do you guys use?

Bump What ratio do you guys use?

Not sure I succeed at maintaining a specific ratio. Perhaps something like 40 : 1 may be in the ballpark. If when running it seems to be exhausting a lot of oil, I use a bit less on the next load, while if it doesn't seem to be exhausting any oil, I will increase the amount added to the fuel.

BTW, I mostly use Coleman Fuel, which is essentially "White Gas" or otherwise known as camping stove and lantern fuel. I do have some Aviation Gas that has a fairly high octane rating, and still carries a little lead if I understand correctly, but hardly ever use it as it seems to offer no real advantage. Still, it is expensive fuel that I got for free (don't ask) so it does have some appeal, as long as I am careful in my use of it!

YIKES!

That is expensive mate.

But you don't need much to do the job on Jin's little engines, so that investment should last you many a year, unless you really run the heck out of them!?!?

This is the same stuff isn't it that you fella's all use?

https://www.ebay.com.au/itm/315013194370

I always mix my MMO 20/1 or 25/1 and have also run with no problems at 15/1.

I like having fresh oil coming out through the exhaust. 
This tells me with certainty that the engine is getting good cylinder lubrication which is critical with rubber O-rings on the pistons.

Jin provides extra O-rings with his engines however I have never needed to replace one.

Gil

I always mix my MMO 20/1 or 25/1 and have also run with no problems at 15/1.

I like having fresh oil coming out through the exhaust.
This tells me with certainty that the engine is getting good cylinder lubrication which is critical with rubber O-rings on the pistons.

Jin provides extra O-rings with his engines however I have never needed to replace one.

Gil

Nor have I, though I'd call it a sure bet that you have more hours on more engines than I do Gil!

Thank you for posting that chart!!!

MMO definitely smells pretty nice.