Don Dunbar wrote:
Don wrote
Paul and group could you help me with some quires.
I have a series 5 RX7 13B turbo engine manufacture 1989-1991 which I
will use in my Cozy MK4 with modifications.
1# Is it better to use two stroke oil in the fuel or leave the existing
oil injection.
I think it is better to mix it with the fuel. You will get a more even distribution
of oil on the inner surface of the rotor housing. You could also do both
for the best of both worlds.
2# Should I leave the sump and oil lubrication system as it is as I will
not be doing aerobatics.
By all means. Perfect for a cross country airplane.
3# Is the fuel injection system that is standard on this model ok to use
with after market EMS systems or would you recommend other fuel
injection systems.
Use the stock injectors but get an EFI/IGN computer from Tracy Crook.
Unfortunately the intake manifold needs to be custom made so it
fits most airplanes. It might fit a cozy with a bump on the cowl.
4# Is there any modifications that you would subject.
????
I can remember a member saying that he is pulling a 300 hp prop with a
13B single turbo, if this is the case is there any reason to use the
higher reduction of 2.8 to 1 when the 2.17 to one would be ideal if you
are only after 210 to 250 hp to the propeller.
I don't wish to start the reduction debate again but there is a large
variation in torque of a turbo engine versus non turbo and a reduction
to suite both.
This engine as standard with the exhaust system and pollution equipment
is reported by Mazda to produce 200 bhp at 6500 rpm and 196 lbs-ft at
3500 rpm. Has anyone had one dyno tested without the above equipment.
Is there any dyno sheets available on the 13B with or without
modifications.
Don Dunbar
Good choice of engine.
Believe it or not torque has nothing to do with it.
If it is generating 200 HP at 6000 RPM then that is what counts.
High torque readings at lower RPM have absolutely nothing to do with it when
using a fixed pitch prop. Just take my word for it for now. HP makes
the airplane fly. If it is a turbo a 2.17 to one PSRU ratio is a good choice
as you can get whatever power you need at 6000 RPM by upping the
boost slightly.
Paul Lamar
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