The most commonly used Suby engine were the EJ82? which used a gear
drive for the camshafts.
www.eggenfellneraircraft.com uses the Suby 6
cyl. engine which has a roller chain drive for the camshafts. I'm not
sure there are any aircraft for sale that uses the TB system but,
maybe single owners who build their own lightweight airplanes.
Actually most of the EAA folks around here (about 40 mi east of Oshkosh on
the shore of lake Michigan) prefer the older EA81 pushrod motors. While
the power isn't as high as later models the power to weight ratio is
better.
Keep in mind that there is a huge difference between what works for the
Experimental Aircraft Association and what commercial aircraft are allowed
to do. Every aircraft sold commercially in this country has to have an
approved type certificate. Once a design has been flight tested and
approved nothing, I repeat NOTHING!, can be added,changed or modified
without an approved Supplemental Type Certificate. It can take months or
even years of testing to get a STC approved and then have only a limited
market. Auto gas STC's are a good example.
Most light planes run just fine on automotive gasoline. By car standards
they're really primitive. It's common to have a mixture control next to
the throttle and to manually set the fuel air mixture after reaching cruise
altitude. I haven't checked lately but twenty years ago the difference
between auto and aircraft gas was about $1.35 a gallon. On a machine that
burns 6-10 gal/hr depending on throttle and mixture settings that starts to
add up pretty quick. The EAA submitted a small mountain of test data and
other paperwork to the FAA and got them to issue STC's for running auto gas
in certain aircraft engines. If your light plane has an engine on the
approved list you can buy a STC from the EAA and then legally run auto gas.
At the time I checked into it an STC for auto gas meant you had to use auto
gas exclusively. Fueling up with the wrong gas is a felony, even if the
plane has been documented to run on the stuff.
That was twenty years ago but I seriously doubt the regulatory situation
has improved any. :-(
Later,
Joe