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I have rather recently purchased a Graupner bundle, a beautiful Yak-54 with the wonderful OS MAX 120AX ringed engine. Given the fact that I encountered some rust on the internal ball bearing of another engine I used before, I thought about using a fuel with 0% (yes, zero percent) nitromethane and 20% castor oil. The engine manual says that this engine has been factory adjusted for a slightly rich mixture (idle mixture, that is) for a fuel containing 5 % nitromethane.
The question I would like to ask is whether there is a problem with using this engine with fuel WITHOUT nitromethane, and if there's a problem if no synthetic oil is being used.
Thank you very much!
Ei:
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Thank you for your purchasing OS MAX-120AX.
The factory setting of 120AX carburetor is for 15% Nitro fuel.
Even 0% nitro fuel, if you adjust carburetor needle and idling screw properly, you can run it right. However, if the fuel contains more nitro, the adjustment is easier and the engine runs more powerful. More nitro containing fuel causes more rust. So in case you use 0% nitro fuel, it may better for the engine in view of rust.
Good caster oil is superior to synthetic oil. Good caster oil has rather better lubrication than synthetic oil. However, caster oil smells worse and it will becomes like varnish and you will face difficulty to start the engine next time if you do not wash out inside the engine after run.
After end of flight of the day you need the following treatment in case you use caster oil:
1. Fill alcohol in the fuel tank and wash out inside the engine by running an engine starter.
2. Drain the dirty alcohol from the glowplug hole or silencer exhause pipe.
We hope you enjoy flying with O.S. Engine.
Best regards,
Pe scurt: daca-l reglezi bine n-are greata, dar spala motorul dupa zbor altfel uleiul de ricin se intareste si o sa pornesti mai greu motorul data viitoare. Din punct de vedere al ruginii, e mai bine pentru motor (nitro -> rugina, dar pe de alta parte nitro -> putere mai mare si reglaj mai simplu).
Later edit: Astept sa vad ce zic de after run oil (daca e bine sa dau cu ulei after run dupa ce-l spal cu metanol curat).
Zbor lin!
Aceasta postare a fost editata de ave: 23 April 2009 - 11:36 AM