Never the less we got one useful data point where the throttle
was 3/4 open at 5250 and intake air temp of 84 degrees F.
The HP was 148. BSFC was .53 and EGTs were 1402 and 1477.
EGTs were down about 100 F from peak 1532 and 1580
The air:fuel mixture was about 15:1

Paul, the Leman HP at 5250 is about 340.  So for the 13B that makes 170,
so you guys are pretty close already.

Hans

Yes but that is only one data point.
We need to have the mixture right at 500 RPM  full power increments from
there up to 8000 or so. I am struggling figuring out
exactly how to do that with what I have to work with.

In an airplane you set the mixture at static RPM and take off
and climb out. You then can back off the throttle and cruise around a
bit to set the mixture for that throttle opening and RPM.
At that point you can slowly increment the throttle, RPM and air speed
while again setting the mixture. That is Tracy's method of programming
his computer. Works very well for an aircraft engine. One never
sees max HP at a given RPM while cruising with a fixed pitch
prop. Top speed yes.

Paul Lamar

It might be useful to put the engine on a prop load to get the mixture
settings in the ballpark.  Then, put it back on the dyno to see how much
power you are really making.

I am sort of surprised the dyno doesn't have a constant speed load.  What
kind of load is used to dissipate the horsepower?

How noisy is it?

When was the last time you had a good night of sleep?  :)  I know that
changes my problem solving abilities.

Keep up the good work...


Regards,

Matt-


When it is at full chat it is quite noisy. No DB numbers on the
noise. I should take my DB meter with me today.

Paul Lamar