Paul,
What's the status of the turbocompound engine? Have you run it?
Peter
I am still building but nearly done. The amount of oil and pressure
required by the TC gear box is a big unknown. I am having trouble
finding info on that.
The parts man at Big T came up with an oil feed line to the TC GB.
Cost all of $20 so I ordered one. I cut it in half and sweat soldered
a modified AN -6 hose fitting to it. I plan on sharing the oil supply
with the 3 rotor. Typically the Mazda engine's oil pressure is much
higher than piston engines so I am hoping it works.
I am awaiting AN-6 oil and AN-10 pressure tap fittings to install 2
oil pressure gages. One for the main engine and one for the Turbo
Compound Gear Box. I don't want to destroy a $3000 DD15 TC system.
This stuff takes time as you have to see what idea works as you go
along with the occasional "That won't work" :) In the mean time,
while I wait for TC parts, I am working on a 12V input 400 volt
output HV supply for modular CD ignition systems. The 13B powered
RV4 uses a Holley 2 bar 500 CFM carb so the old LS1 coils will not
work.
The 3 rotor TC test engine is using a 110 V AC in wall powered HV
supply for the CD modules. Six plugs in all. That is working fine on
the bench. I have lots of confidence that will work on the engine.
I need to figure out how to clone myself so I have a non paid
competent assistant. :)
Paul Lamar
Paul,
What about an oil temp indicator on the return line from the TC
gearbox? It would give you
a good measurement of whether it needs more/less oil feed...
roger paxton
Good idea Roger. One of the functions of the oil is to cool the bearing.
The turbine needs a cool bearing as there is a lot of heat transferred
from the spool.
I have a laser, infrared, hand held thermometer
Paul Lamar
Paul
As the blow down turbine gear box is hard coupled to the eccentric shaft
is there a chance sympathetic vibration could be a problem.? It could
almost instantly destroy the gear box
! Perhaps a shear pin or something similar would be
prudent. yours
truly Grant Taylor
There is a fluid coupling inside the gear box.
Paul Lamar
I found a reference about Turbo-Compounding from its early times,
in the June 1945 SAE Journal issue:
'Turbine Compounding with the Piston Engine' C F Bachle
The whole issue can be downloaded from
www.sae.org
for $15
You'll tell us if it was of interest. Salut
Jose Gros-Aymerich
Madrid, Spain
I got the oil pressure fittings installed.
Next project is the oil drain back to the 3 rotor oil pan
from the turbo compound gear box. Always a problem with turbo chargers.
The drain back line is always much larger than the feed line.
In this case it is almost one inch inside diameter.
Paul Lamar
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