Four Stroke vs Two Stroke Fuel Differences
 

Hi.

I am thinking about moving up to a four stroke Saito .82 engine from a OS .65 LA. Does this require a different fuel than a two stroke?

Should a specific fuel be used to break in the engine?

RE: Four Stroke vs Two Stroke Fuel Differences
 

I have always used 15% nitro with an 18% oil content. (Powermaster) You can use the Powermaster 20/20 if you'd like too but it costs more.

RE: Four Stroke vs Two Stroke Fuel Differences
 

I believe Saito recommends 20% synthetic oil content. Castor tends to build carbon up around the valve seats and guides causing loss in compression and power.

RE: Four Stroke vs Two Stroke Fuel Differences
 

i use Cool Power 30% heli fuel in all my 4 bangers with great results. if you're going with the Saito the 20/20 blends would be my suggestion, they have a bit higher compression then most so the lower nitro fuel is easier for the newbie to tune in them.

kc

RE: Four Stroke vs Two Stroke Fuel Differences
 

I use Cool Power 15% in all of my engines, both 2-stroke and 4-stroke. As long as your lubrication content is ~18% or higher you will be just fine using it in your 4-stroke engines.

Ken

RE: Four Stroke vs Two Stroke Fuel Differences
 

Don't waste your money on high nitro, 10% to 15%/W 18% lubrication will work fine.

RE: Four Stroke vs Two Stroke Fuel Differences
 

Thanks.

I went with the Morgan Fuel 10% Nitro Cool Power. The rep at the hobby shop said it has 18% synthetic oil.

I can't wait to fire up my new Saito .82!!!!


Another question, why is this fuel green and the others are pink?

RE: Four Stroke vs Two Stroke Fuel Differences
 

Its the oil they use.

RE: Four Stroke vs Two Stroke Fuel Differences
 

While castor will EVENTUALLY do some gumming of the engine, the additional protection against a lean run may be worth it to you.

I usually add 3 oz of castor to 1 gallon of fuel (Powermaster 15% ). I have 3 Saitos, a 72, 80GK and an 82. My 72 has about 4 gallons through it and the only thing I have had to do is one valve adjustment and 2 glow plugs.

RE: Four Stroke vs Two Stroke Fuel Differences
 

I use Omega 15% Synthetic/castor blend . I have Saito and Magnum 4 strokes and OS, Supertigre and Evo 2 strokes and all run fine on it.
I think full synthetic is O.K but Magnum recommends a castor blend with thiers. So I can cover all bases with the Omega.

RE: Four Stroke vs Two Stroke Fuel Differences
 

No it's the dye they use :)

kc

RE: Four Stroke vs Two Stroke Fuel Differences
 

I'm almost in my third year with 2 and 4 strokes in the hangar.They are flown several times weekly year round.I use the same thing Ken does,CoolPower 15% and have not had the first problem.;)

RE: Four Stroke vs Two Stroke Fuel Differences
 

I have a question about the castor oil in glow fuel. Is it the same as the castor oil you find in the pharmacy?:eek:

RE: Four Stroke vs Two Stroke Fuel Differences
 

Cruel Power green fuel? This is only about 17% straight synthetic fuel, and it has no castor oil in it whatsoever. This is, by Morgan Fuel’s own ads, inappropriate for ABC, ABN (and AAC) engines, but this is exactly the fuel many use. Low lubrication fuels account for a lot of the cases of nickel liner separation in the OS FX, SF series for example. Not only that, but a number of pilots really run their engines lean in the air, and this compounds the problem, and leads to premature failure of an otherwise good, strong engine. A good high quality castor oil would only be found from Bakers AA castor oil and Klotz Benol racing castor (sold since 1958), the very best (pure). Generally speaking smaller engines (.19 - .65) use more oil content than larger engines. 20% oil is a better fuel offering a cooler running engine, more powerful leaner runs with a larger margin of protection. Castor works efficiently when the engine is at operating temp, not good on a cold engine. Bad some decades ago, the older engine fuels had more castor (20%-29%) and today many freeflight and control line engines running wide open use more oil content.