[Diy_efi] RE: Diy_efi Digest, Vol 1, Issue 506

[efi student]

Yes, LN=3Dliquid nitrogen.  My lab used to use about 3000 lbs a week.  =
Part of
my responsibility was to ensure its availability.  We also used methane =
for
glass torches, that's what made me think of your application.  We had a
brilliant young lad decide he thought it would be interesting to liquefy
about a pint of methane in a fully enclosed area in our lab.  His =
employment
was relatively brief.  I don't recommend liquefying combustibles in =
enclosed
areas, your next of kin may not appreciate it either.

Lance

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of Mike
Sent: Saturday, January 11, 2003 10:51 PM
To: List for general do-it-yourself EFI talk
Subject: RE: [Diy_efi] RE: Diy_efi Digest, Vol 1, Issue 506


At 10:42 PM 1/11/03 -0800, you wrote:
>What if you ran it through an LN trap and liquefied it?  Put the=20
>carefully measured liquid in your container, allow it to return to=20
>ambient temperature, voila, high pressure NG, no pump required.  I used =

>to work in a cryogenic lab, we did this all the time...in fact, you can =

>amaze and amuse your friends with a few drops of LN in a sealed=20
>container that isn't cooled...

mmmm - I take it LN =3D Liquid Nitrogen ?

Costs about a $1 per litre here in bulk, though I have been looking at a =
3
stage stirling compressor to make small qtys of liquid air, I guess that
would do the same thing. Actually, I've been in favour of using methane =
for
a while and this might be a way to do it, its almost the perfect fuel,
little CO/CO2, mostly H2O exhaust, no sulphur. But the drawback is the =
high
pressure tank :(

Is there a solvent one could use for methane, much like acetone is a =
solvent
for acetylene and no I dont want an acetylene tank in my boot ~`:o

Thanks for the post, like the cooling idea, is a cheap stirling cryo =
coolar
avail around the place - if so can I chill my tank in the car and get =
away
with it that way <:o

rgds

Mike




>
>Lance
>
>-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]=20
>On Behalf Of Mike
>Sent: Saturday, January 11, 2003 10:18 PM
>To: List for general do-it-yourself EFI talk
>Subject: Re: [Diy_efi] RE: Diy_efi Digest, Vol 1, Issue 506
>
>
>We had a chap here in perth who did a CNG conversion for a Ford
>StationWagon and IIRC used bosch methanol injectors from a gas pressure
>regulator. The tank ran at something like 2000psi so no fuel pump =
needed.
>With CNG being mostly methane, there was no evaporator but high =
pressure
>tank in back of wagon which could only hold enough for half the normal =
cars
>distance, ie. Wasnt deemed legal to have a large 2000 to 3000psi tank =
of
>methane so a smaller one was used that was just within fire/legal =
limits. I
>think he works for the local gas company - trouble is we couldnt do =
that as
>we only get CNG piped from 100psi main to 0.5psi at the home, bugger =
the
>politics ! They absolutely refuse to remove the 0.5psi combo=20
>regulator/meter and put in a 100psi flow recorder/meter instead. That =
makes
>it woefully uneconomic to pump up from 0.5psi to 2000+psi to make it
viable.
>Also the fed gov. wouldnt get their excise on CNG as they cant tax for =
use
>but have to tax for product etc hence problematic delineation between =
home
>heating/cooking and fuel given we pay about 50% per litre 'tax' for =
parity
>pricing etc.
>
>rgds
>
>mike
>
>
>At 11:06 PM 1/11/03 -0700, you wrote:
>>I wonder how well the GDI injectors would tolerate LPG... That could
>>make for a mighty fine motor.
>>
>>Chris
>>
>>>surely you'd need much bigger injectors as your spray time per engine
>>>cycle is less, or will you raise pressure or also spray a little when =

>>>the inlet valve is closed ?
>>>
>>>rgds
>>>
>>>mike
>>>
>>>
>>>
>>>At 05:35 PM 1/11/03 EST, you wrote:
>>>>well im no EE but ive been working on a AVR based injector=20
>>>>controller
>>>>that
>>>>takes a ecm pulse and converts it into a sqeautnaily timmed pulse. =
im a
>long
>>>>way away form having it built. but it can be done. and alot of CDI
>>>>engine
>>>>desiels and the mitsu stuff are in fact rail controlled fuel =
pressue.
but
>>>its
>>>>more in the head return. the point of CDI isnt to spray fuel=20
>>>>directly
>>>>into
>>>>the cylinder. its to take advantage of the vaporazation from the =
heat of
>the
>>>>chamber/and being able to time the fuel to stave off detonation with
>>>>hgih
>>>>compresion ratios. a hot injector pintle will really help to atomize =
the

>>>>fuel. this will inturn make it easier to ignite of very lean =
mixtures.
>yet
>>>>again any GM ecm could be use with a bit of hardware development.=20
>>>>then
>again
>>>>for all the trouble it might actually be easier to just scratch=20
>>>>build something or use a design similar to the efi332 project.
>>>>
>>>>  its all subjective. there alot of way to skin the cat.
>>>>
>>>>_______________________________________________
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>>>>
>>>>
>>>
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>>>
>>
>>
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