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Posted by Tim Wescott on March 9, 2010, 12:06 am
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I want to CC a few Cox 049 heads, but none of them are going to contain
more than a fraction of a CC of volume.
Anyone know how to do this when the volume to be measured isn't that
much larger than the volume in a drop of light oil? I'm thinking maybe
a small syringe, complete with needle, filled with mineral spirits,
really really light oil, or rubbing alcohol.
But I'm open to suggestions.
--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
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Posted by Ecnerwal on March 9, 2010, 12:26 am
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> I want to CC a few Cox 049 heads, but none of them are going to contain
> more than a fraction of a CC of volume.
>
> Anyone know how to do this when the volume to be measured isn't that
> much larger than the volume in a drop of light oil? I'm thinking maybe
> a small syringe, complete with needle, filled with mineral spirits,
> really really light oil, or rubbing alcohol.
>
> But I'm open to suggestions.
Probably cost too much, but the biology/microbiology types have
"micropipettes" (the tip that holds the fluid is cheap, the thing that
controls how many microliters are dispensed is not, I think) - I've seen
them, never bought one.
Without much shopping effort, 2-20 uL for $99 (but they don't seem to
have tips to fit that one?)
http://www.enasco.com/product/SB39111M
Fixed volume 5 or 10uL is only $20, 250 tips for 11.30 from the same
place, but you should no doubt shop more before buying, if buying.
--
Cats, coffee, chocolate...vices to live by
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Posted by Ed Huntress on March 9, 2010, 12:27 am
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>I want to CC a few Cox 049 heads, but none of them are going to contain
>more than a fraction of a CC of volume.
>
> Anyone know how to do this when the volume to be measured isn't that much
> larger than the volume in a drop of light oil? I'm thinking maybe a small
> syringe, complete with needle, filled with mineral spirits, really really
> light oil, or rubbing alcohol.
>
> But I'm open to suggestions.
>
> --
> Tim Wescott
> Control system and signal processing consulting
> www.wescottdesign.com
As a diabetic who uses plastic syringes for many things, I think you'll do
best with rubbing alcohol. The rubbery plunger material doesn't stand up to
petroleum oils for very long (maybe hours -- that's how I lube the bearings
in my furnace blower fan, using South Bend spindle oil), and, if you get the
98% isopropyl that they probably have behind the pharmacy counter, you won't
find many common materials that have lower surface tension. You want as
little water in it as you can get for lowest surface tension; it appears to
be related by a rule of mixtures. Water and alcohol don't cause the plunger
to stick until they've been in the syringe for a few days. With oil, leaving
it in the syringe will make the plunger stick and it will be almost
impossible to dispense smoothly after a few hours.
Straight isopropyl has a surface tension of around 22 mN/m; water is 75;
gasoline is around 20. So mineral spirits probably is in the same
neighborhood as gasoline, and probably, again, offers no advantage over the
alcohol.
Good luck. CC-ing an .049 engine has to be pretty tedious. I had enough
hassle doing it with a 1300 cc Alfa Romeo.
--
Ed Huntress
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Posted by Ed Huntress on March 9, 2010, 12:35 am
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>I want to CC a few Cox 049 heads, but none of them are going to contain
>more than a fraction of a CC of volume.
>
> Anyone know how to do this when the volume to be measured isn't that much
> larger than the volume in a drop of light oil? I'm thinking maybe a small
> syringe, complete with needle, filled with mineral spirits, really really
> light oil, or rubbing alcohol.
>
> But I'm open to suggestions.
>
> --
> Tim Wescott
> Control system and signal processing consulting
> www.wescottdesign.com
BTW, I'm curious about why you'd CC a single-cylinder engine, unless you're
experimenting with compression. Or are you using them in a multi-cylinder
configuration?
--
Ed Huntress
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Posted by Tim Wescott on March 9, 2010, 2:31 am
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Ed Huntress wrote:
>> I want to CC a few Cox 049 heads, but none of them are going to contain
>> more than a fraction of a CC of volume.
>>
>> Anyone know how to do this when the volume to be measured isn't that much
>> larger than the volume in a drop of light oil? I'm thinking maybe a small
>> syringe, complete with needle, filled with mineral spirits, really really
>> light oil, or rubbing alcohol.
>>
>> But I'm open to suggestions.
>>
>> --
>> Tim Wescott
>> Control system and signal processing consulting
>> www.wescottdesign.com
>
> BTW, I'm curious about why you'd CC a single-cylinder engine, unless you're
> experimenting with compression. Or are you using them in a multi-cylinder
> configuration?
I'm going to fabricate some heads, and experiment with compression and
combustion chamber shape (within the limits imposed by using a glow
plug, which is relatively huge compared to the 049's cylinder diameter).
--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
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> more than a fraction of a CC of volume.
>
> Anyone know how to do this when the volume to be measured isn't that
> much larger than the volume in a drop of light oil? I'm thinking maybe
> a small syringe, complete with needle, filled with mineral spirits,
> really really light oil, or rubbing alcohol.
>
> But I'm open to suggestions.