We ran the p-port engine again today on the EFI system
and slide throttle. Runs great. Will idle below 1000 RPM.
Starts easily. Idles smoothly more or less under 1500 RPM.
The mixture through out the RPM range is better with
the $200 manifold referenced fuel pressure regulator
but still a bit rich on the low end and a lean on the
high end. We are running out of dyno time to do further
mixture and ignition timing tuning. Max HP was 222. I used
Tracy's Mode three to set the mixture richer by eight clicks
over the entire MAP and RPM range. We did no Mode 1 tuning.

 From here on out final tuning will be done with a prop
load in the air at altitude. The EGT's track together within about
40 F which Dave says is not that bad. Could be a
difference in fuel injectors. Perhaps one runner at
the slide throttle is leaking more air than the other.

No time to build a new sealed slide throttle before Dave must
dyno another engine. We will do one more run tomorrow or the
next day with Jerry's muffler.

Next project is to bench test some fuel injectors.

Paul Lamar

Paul,
I think the results will only get better with some minor tweaking.
George (down under)

I hope so. I just revised the design yet again to eliminate
all possibilities of air leaks affecting the tuning.
More about that later.

Paul Lamar


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