Author: "John Hasbrouck" <jhasbrouck@...> Time: Mon Aug 23, 2004 6:29 pm PDT Link
What about using an O-540 @ 235HP instead of an IO-540? The 235HP
engines were lower compression and would run on 80 octane avgas.
These shouldn't have a problem with mogas assuming the rest of the
installation would tolerate it. Remember that STC's for autogas were
based on engine and airframe combinations. Are these engines heavier
than the one Van's recommends?...........John Hasbrouck
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Author: "Bob Condrey" <bob.condrey@...> Time: Mon Aug 23, 2004 7:53 pm PDT Link
If you examine the Lycoming descriptions closely you'll see that the
IO-540-D4A5 (engine in Van's prototype) is closely related to several
others including the O-540-B series which are 235 HP with an 80
octane minimum. Comparing the O-540-B4B5 to the IO-540-D4A5 pedigree
shows that the differences are mag type (impulse coupled vs. Retard
Breaker), low compression pistons (7.2:1 vs 8.5:1) and Bendix fuel
injection. I recently purchased one of these with very low time SMOH
and will put fuel injection and electronic ignition on it. I'll
probably leave the pistons as is unless something causes me to have
to pull all of the jugs.
Link to the current Lycoming engine specs is:
http://www.lycoming.textron.com/productSales/engineSpecifications/SSP2
04.pdf
You can find similar data along with the weight data in the TCDS but
I don't have that link handy.
I wound up building a "family tree" for the IO-540-D4A5 and any other
engine that I considered during my search. It turns out that IO-540-
D4A5 and -C4B5 models are plentiful on the used market. The D4A5s
weren't used in many airframes and the Aztec crowd is competing for
the C4B5s. Looking toward the non-injected engines opens the field
up a lot. A new Airflow Performance or Precision/Bendix fuel
injection system is around $3200-3300.
Bob #40105
--- In RV10@yahoogroups.com, "John Hasbrouck" <jhasbrouck@w...> wrote:
> What about using an O-540 @ 235HP instead of an IO-540? The 235HP
> engines were lower compression and would run on 80 octane avgas.
> These shouldn't have a problem with mogas assuming the rest of the
> installation would tolerate it. Remember that STC's for autogas
were
> based on engine and airframe combinations. Are these engines
heavier
> than the one Van's recommends?...........John Hasbrouck
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