Re: 2-strokes and oil ratio

On Nov 4, 12:13 pm, Tiago Rocha <diariodastril...@xxxxxxxxx> wrote:
On Nov 4, 1:50 pm, Mike W. <outof...@xxxxxxxxxxxx> wrote:





On Tue, 4 Nov 2008 08:28:25 -0800 (PST), JayC <j...@xxxxxxxxxxxxx> wrote:
My question as I am about to light up my next blower in about 30 min....
would you bump the oil ratio? I've got a 50:1 spec and plan on putting 40:1
in it at this point. Any thoughts?

E10 does require richer jetting than straight gas - by something on
the order of ~4%.  That generally cooresponds to going up a size on
the pilot and a couple of sizes on the main.  It is possible that
leaner running could cause some problems, especially on hand-held
equipment that only runs WFO all the time.

As far as oil ratios go, I run 32:1 in everything - bikes, chainsaw,
etc.  That way, I only need one gas can ;).

JayC

Mike and Jay,

Thanks... Does that 4% result from any sort of computation or more a rule
of thumb? Same question about going from 4% to jet size?

I'll clean out the 40:1 can I have and then take it down to 32:1.  I wonder
if there's any sort of EPA effect on pushing the ratios higher.

Hi Mike!

Jay got it right. It's not the alcohol that blows the engine, is the
jetting that does it and two stroke engines are very sensible of
jetting. I suspect the smaller the engine, the more sensible it is.
Alcohol has less energy so it leans the mix. Also, alcohol does not
mix with oil the same way gasoline does not mix with water, but
alcohol mix with water and alcohol mix with gasoline, so alcohol
serves as a catalyst between gasoline, oil and water. Complicated
stuff. You can separate alcohol from gasoline adding water and letting
the mix settle. The water with draw the alcohol to the bottom and the
gasoline will float, all gas stations are required to test alcohol
content on gas, since ethanol is much much much cheaper than gasoline.
The alcohol in the gasoline is supposed to be anidride, no water and
the test require that in a graduated cylinder, pour 50ml water and
50ml gasoline (which should be dyed, yellow, green, blue, whatever).
Agitate to mix well and let settle. In a few minutes, you will clearly
see where the line is. If the line is on 60ml, it means that you had
10ml of ethanol on that gasoline... The stuff floating on the top is
40ml pure gasoline now.

-- Tiago- Hide quoted text -

- Show quoted text -

I forgot to thank the Wizard Lurker for buying race gas on Sunday. No
worries there. BRAP!
.

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