marc mularz wrote:
Paul,
I was going to ask the same question as Butch but he beat me to it! Perhaps
you could answer a few other questions for me.
1. At 5-6000 rpm, what kind of fuel consumption are the guys running
13b's finding (in gph)?
Depends some what on the airplane, HP needed and the prop as the throttle is less
than WOT. Tracy claims he is down to less than .5 pounds of fuel per HP hour.
Lets us say .48 and 140 HP cruise. That would be 67.2 pounds of fuel per
hour. At six pounds of fuel per gallon (and this number varies slightly
with temperature) that would be 11.2 gallons per hour. Obviously
if the airplane is cleaner and you can cruise at a lower HP setting the
fuel burn would be less. Tracy must do that as he claims he cruise
at less than 10 gallons per hour.
2. In looking at the ACRE NL website and the photos of the
peripherally ported engines I'm not sure of what is being done to the engine
to make it a peripheral port engine. Could you post a photo with some
labels? Also, how does this increase the HP of the engine?
The breathing is much better as it is a straight shot into the suction chamber.
That means less HP loss attributable to pumping the air into the engine.
3. From the articles that I have read about the 13b it sounds like a great
engine, but there seems to be a bazillion different model numbers for this
engine. Could you list for me the top 5 models (candidates for aircraft
use) and in which vehicle/year they were found?
Thanks for your help and the time you put into this forum. I am learning so
much about engines that its just like being back in college again. (Now if I
could just get my wife to let me start building my new plane!! ;-) Take
care, Marc M
Now that would be beyond me. But what you are looking for is a four port
later than 1989. Not a turbo unless you are planing on a turbo.
The turbo rotors are lower compression ratio. Tracy is running a turbo
motor normally aspirated with non turbo high compression rotors.
As you can guess there is a lot of mixing and matching possible.
Bruce Turrentine can build up an engine for you at reasonable cost.
Paul Lamar
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