DIY_EFI Digest V1 #86

[talltom]

Has anybody had any success with electronic port injected liquid propane
with O2 sensor
and turbos? How much compression/boost? What happens when you go to far? Is 
there such a thing as to far?
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>From: Darrell Norquay <dn at dlogtech.cuc.ab.ca>
>Date: Sat, 23 Mar 96 16:44:21 MDT
>Subject: CNG/LNG
>
>>         I remember reading an article on natural gas injection that was put
>> in a 302cid Ford Mustang which, incidentally, utilized the FACTORY ECU. I
>
>>         I also recall that the stated octane rating of the gas is
>> 130....could anybody verify this, and if so, why not run a 10:1 compression,
>> bump the timing up a little, and run 10 psi of boost???(can't do that with
>
>Compressed Natural Gas (CNG) does have an octane rating somewhere near to
>130 - you can run 25 degrees initial advance, and upwards of 35 total.
>It's cheap, (at least here in Canada), and it has VERY low emissions.
>Having said that, it is stored in tanks at up to 3000 PSI, which means
>they are big, heavy, and they don't hold much fuel.  Typically, range is 
>very limited.  It's hard to find fuelling stations, (getting a bit easier)
>and it takes half an hour to fill up.  Plumbing and installation is very 
>expensive, all stainless hard tubing (no hoses allowed).  Doesn't have as
>high a specific energy rating (per lb) as gasoline, making fuel consumption
>much higher.   All in all rather impractical for a street vehicle.  There's
>no reason you can't run turbos and high compression with CNG, it's just
>that nobody does... (Taxis, couriers, etc use it somewhat, and our local gas 
>company's service vehicles are all CNG - it figures)  
>
>Propane (LPG), however, has a pretty good octane rating(110-115), is also 
>cheap, clean, and the tanks and plumbing are much lighter and less costly 
>since you only have to deal with a couple of hundred PSI.  Tanks also hold 
>more fuel since it is in a liquid state instead of a gas, and you can get 
>it anywhere.  Ideal fuel for use with turbos and superchargers.  All in all 
>IT IS a good fuel for a street/high performance vehicle.
>
>Both fuels promote long engine life because of the cleaner combustion and
>the fact that these fuels are not solvents like gasoline and don't wash the 
>lubricating oils off cylinder walls and valve guides, etc, thus prolonging
>their life substantially.  Half a million miles is not too unusual between
>rebuilds on a propane engine, if it was built specifically for propane in 
>the first place...
>
>There are no stupid questions, only stupid answers...
>
>regards
>dn
>
>
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>
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> Darrell A. Norquay              Internet: dn at dlogtech.cuc.ab.ca     
> Datalog Technology Inc.         Voice: (403) 243-2220
> Calgary, Alberta, Canada        Fax:   (403) 243-2872            
> 
>       "Absolutum Obsoletum" - If it works, it's obsolete    
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