Paul,

    I have quite a bit of experience running the 13b on natural gas. In  fact
   Mazda
   built 13b natural gas engine blocks back in the '90's.
    There are still some here in my state still brand new in boxes. I  just
   bought two.
   During testing when I worked at RPI the 13b would  run 8k -10k on the
   stock seals.
   With ceramic seals the time doubled.
    The natural gas engines come with ceramic seals and 9.7 compression.
    Another interesting thing about the natural gas engines is they run  so
   clean that
   they have omitted the trailing ignition. The rotor  housings only have one
   spark plug
   hole. And the oil metering is half  of a gasoline 13b. So the engine is
   equipt with
   two spark plug  distributor and only two line oil metering.

    Back in the day we did a test in the field with the Idaho fish and
    wildlife for an
   indian tribe raising salmon. They needed an engine  to pump water from the
   river into
   tanks where they would raise the  fish and then put them into the river.
   The engine
   had to run for six  week straight. The requirements where no engine
   pollution, no
   noise,  and no evidence left behind when job was finished. The team parked
    the 13b
   on a trailer near the stream with a belt drive running a  pump. A propane
   take was
   delivered to the area and feed the engine.
    The engine had an audible horn and light to tell when it was time to  add
   the oil. A
   local indian tribe member parked a small trailer next  to the engine
   trailer and kept
   the engine topped off. Worked great.
    Maybe you could pass this along to Danny Perterson.

    Thanks,Skip Gorman



    Who do you get ahold of to buy an engine and how much?

   Dale Davies


   Thanks for the info Skip,
   I was out of pocket for a few days.  Like Dale I am curious how I can get
   ahold of
   one or more of these boxed engines.  Next question, what
   type of reduction unit should be used?
   Danny Petersen



 I remember someone selling the ceramic apex seals for these on ebay last
 year.

 Ed Carver



I was watching Hot Rod TV on Speed Channel this evening.  They were
talking about a liquid propane injection system that Mother's developed.
 Looks interesting.  They were building a dragster with it.

http://www.autoblog.com/2007/10/31/sema-2007-1-000-hp-propane-chevelle-by-mothers/

You'll have to glue the URL back together.  Check it out.

They said it was way better than the gaseous propane version.

 Mark LaPierre


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