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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> oil content Q?
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oil content Q? - 1/1/2008 7:27:59 AM   
tonywayne



Posts: 242
Joined: 4/13/2005
From: benton, MO, USA
Status: offline 		I don’t understand. Allot of 2c engines "on tower" have a minimum of 18% oil requirement. But tower doesn’t sell a 2c fuel with more than 17%. Some engines recommend at least 20% oil. Power Master sport fuels is 18%. The old discontinued 46fx on tower says minimum 20% oil, iv had this engine for many years and have many hours on it. and iv only ran omega and cool power threw it witch has only 17% oil content. What’s the dill do i need to start adding castor to my fuel or is the standard 16, 17, 18% ok these days for a synthetics or synthetic/castor blend 2c nitro fuel? Have i been abusing my 46fx for the past 7 years by only running 17% oil content threw it? Thanks Tony

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RE: oil content Q? - 1/1/2008 8:15:30 AM   
XJet


 

Posts: 2995
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: online 		Tony, there's a couple of other threads running here which deal with the percentage of oil needed for good engine protection and performance.

You'll also get a thousand and one different opinions so I suggest you read what's already been written to get an idea of the general consensus.

However, here are my own opinions (which are worth what you're paying for them).

On an ABC engine, always use a fuel that has at least a small percentage of castor (that probably means Omega in your case).

A ringed engine can run with a straight synth oil package although a little castor certainly will not hurt.

The percentage of oil you need depends in a range of factors but the key one is the quality of the oil.

Fuels blended in the USA tend to use what is now considered only a low to average grade of synthetic oil and this needs to be mixed to at least 17% by volume. The Europeans and one US fuel maker however, tend to use more advanced synthetic oils that can be run quite safely as low as 10%-12%.

If you're using a commercially brewed fuel, the difference between 17% and 20% oil is probably going to make zero difference to your engines but I certainly would be hesitant to go below 17% unless a better oil were used.

Regardless of the oil and oil percentage used, you should be (and probably already are) aware that engine tuning is critical to good performance and long life. 200-300 RPMs rich of peak is a good rule of thumb. Running engines at "peak" RPMs provides no safety margin against overheating and lubrication failure.

If you're still worried, you can add a few ounces of straight castor to your store-bought fuel to bring it up to 18% or 20%.

Most people have no problems with lack of lubrication in their engines, regardless of the fuel they use -- unless they're really trying to wring the last few RPMs out of them or have cooling issues due to bad cowling designs or whatever.

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(in reply to tonywayne)
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