Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Jim on May 17, 2025, 01:21:18 am
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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
@RedRyder what mix would you run in a little Red Wing? Asking for a friend… 😜
;D ;D ;D ;D
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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
@RedRyder what mix would you run in a little Red Wing? Asking for a friend… 😜
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MMO definitely smells pretty nice.
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Thank you for posting that chart!!!
Cheers I was happy to find it myself.
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Thank you for posting that chart!!!
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Handy chart....if you're 'oil mixing challenged' like me :)
[attachimg=1]
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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!
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Appreciated!
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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
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This is the same stuff isn't it that you fella's all use?
https://www.ebay.com.au/itm/315013194370
Yep, looks about the same packaging anyway.
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This is the same stuff isn't it that you fella's all use?
https://www.ebay.com.au/itm/315013194370
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Read so much about MMO.....I thought I better get some.
Its not a 'thing' down here so was really hard to locate.
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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!?!?
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I'm using an Aussie version of 'white gas' Shellite.
The MMO was exxy at $50 bucks delivered for 473ml.
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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!
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Bump What ratio do you guys use?
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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?