Fuel Mixture The diffinitive 2 stroke oil thread

Ozi

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There are a lot of threads here on the topic and a wealth of Information on the web so hopefully for someone that is looking for the answer to
'whats the best oil to use ?' is answered here.


1. Which 2 stroke oil do you use and why ?
2. What ratio do you use ?

For my 48cc HT engine I have settled with Caltex Revtex Semi synth. Super 2T.

I needed an oil that mixed well at cold temperatures and this one seems to be the best for me.

I used Valvoline racing mineral oil for run in at 20:1 for about 200mi
I use the Caltex at 25:1 with 98 octane ULP


Ozi
 
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I use a synthetic oil that is blended with 20% degummed castor. The small amount of castor increases the oil's flashpoint by 200 deg F to 440-460 deg F meaning it stays and lubricates longer before it is burned. Regular synthetic flashses at 220-240 Deg.

I currently use it at a 50:1 ratio but recommend it be used at a 32-40:1 ratio.
 
1. I use Amsoil Saber/ Dominator /Interceptor. Currently I am running Interceptor mixed with just a little castor oil.

2. I use 25:1 - 40:1.

Castor oil does have some great and interesting properties. Best is it's ability to protect in extreme, near weld contact EP events. Worst is it's not so clean burning in street engines, fouled plugs and such. Comparing the flashpoints of an unblended 2 stroke oil is interesting but not necessarily a practical or useful tool. Easily demonstrated by finding out the flashpoint of any oil mixed with gasoline.
 
Nothing about motor oil is definitive. Ask 10 people and you'll get 10 different answers! :)

As far as 2 stroke oil goes for me, I use a good synthetic (Mobil 1 racing 2T) at 32:1 ratio. I personally would not use any castor oil in my gasoline two strokes. A happytime engine (or any bicycle engine) will hopefully never see the operating conditions where castor oils strengths would be an advantage. Dirt bike racers often use a castor blend, but their engines are punished and torn down frequently so the deposits castor oil leaves ehind aren't an issue. The Mobil 1 is probably overkill, but hey, I figure I can be a big shot.
 
Pablo,
You started it. Pure synthetic is garbage in a 2 stroke. Flashpoint is critical. Engine temps easily exceed the 220 deg flashpoint of AMSOIL saber oil. This means that the oil is vaporized before it is ignited in the air fuel mixture.
Yes, flash point isn't everything and castor, not synthetic of any brand, has the best lubricating ability under extreme temps, pressures (high load bearing surfaces). The only drawback is a nice dry lubricating film on all of the internal parts. I have yet to have a fouled plug or a ring stick from using castor.

Truth be known, my rotary powered car even gets a little castor in the tank to supplement the motor oil that is injected into the engine. Its still running strong since 1991.
 
Hi Skyliner70cc,

I have no experience with castor but what you say makes sense. You use a 20% ratio,
did you experiment with different ratios then settle with a 20/80 castor synth mix?
What would be the minimum amount of castor in % that would be beneficial?
Would say 10% do much to help with lubrication - that stuff is pretty pricy:mad:

What synth oil do you use and what brand of castor


regards


Ozi
 
Has anyone used biodiesel (B100) as 2 stroke oil? It's just veggie oil, not castor but usually soybean, converted to a methyl ester. I have heard of people using it as 2 stroke oil, but haven't heard any results.
 
I use castrol 2t motorcycle oil at 32:1. I can't find any synthetic stuff, checked wal-mart, autozone and advance auto. Where do you guys get yours?
 
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