[NSRCA-discussion] Acetone in methanol?

[Koenig, Tom]

Gentlemen,

How much silicone is in a DZ though? I'm not sure if the pump diaphragm is silicone? The pushrod cover o-rings however may be silicone.

Last night I mixed another batch with 3%. I hope I wont see any degradation of seals with just 2 gallons worth-but if I do, I'll let you all know.

Thank you for the information-I'm learning considerably.

Tom

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Grow Pattern
Sent: Wednesday, 22 February 2006 3:06 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Acetone in methanol?


It not just a matter of swelling with a YS silicone diaphragm. If they go soft and spongy they also behave badly. A tip - you need to look at the diaphragm immediately after you remove it from the motor. If it is "belled" or distorted you could well have a bad one. I said immediately because they go back to a flat shape quite quickly when not inside of the pump.

I have been fooled by this a couple of times until I caught the little bugger doing it!

Regards,

Eric.

----- Original Message -----
From: Gray E  <mailto:gfowler at raytheon.com> Fowler
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> 
Sent: Tuesday, February 21, 2006 10:00 AM
Subject: Re: [NSRCA-discussion] Acetone in methanol?


Tom

Not sure of YS engines but most 2-stroke engine pumps have a diaphram made of teflon coated glass, which is fine with the acetone, but silicone fuel tubing will be deteriorated, as will any othe silicone part  (if any) in your engine. Viton will resist acetone okay (o-rings). Big problem may be volatility as acetone will boil at about 40C (note that I converted for your benefit) which is way lower than the other components in fuel. If Acetone works and is not damaging your engine seals (use gasoline tubing) try Methy-ethyl Ketone (MEK), more expensive, much less volatile (one more carbon in the molecule). Next up the chain is methy-isopropyl Ketone, which is a difficult product to obtain in the USA at a hardware store....gotta go to Fisher chemical.



Gray Fowler
Principal Chemical Engineer
Composites Engineering



"Koenig, Tom" <Tom.Koenig at actewagl.com.au>
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02/20/2006 04:46 PM


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[NSRCA-discussion] Acetone in methanol?

	




Gentlemen,
You may be aware most of us down here mix our own fuel. We have available pure Methanol or a methanol product 'Shell A' which has 3% Acetone in it.
I have added 2-3% acetone into my fuel mix ( I buy pure Methanol) and I'm not sure if I could detect a difference, if any at all. It may have idled a bit better-but it could have been my imagination??
 
So my question is-what exactly can/does Acetone do in our fuel mixes?? Does it do anything at all??
 
Thanks for any insight.
 
Tom
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