<<   The current power level from a non bridgeported 13B
 > is 225 HP. I confirmed with two builders that best power is available with
 > more than 30 degrees of lead. That was 36 in one case. One says split the
 > timing events and the other says fire both at the same time. I looked at
 > another 13B before it was assembled and went on the dyno last Tuesday. It
had
 > very mild bridge ports, very small. It has 259 HP. .
 > Lynn E. Hanover

 What RPM's are these HP levels Lynn?

 Paul Lamar

The 259 was at 9000.  Daryl Drummond has gone as high as 9,800 with a 13B
with very light rotors to get 305 HP through two 44MM venturies. Nothing here
useful on an aircraft unless it was just for Oshkosh demonstrations. But
moving the port under the oil scraper and not closing it later would keep the
low RPM power. If you are going to turn it 4,000 or 4,400 it is flowing well
and can tolerate a bit later closing. We are outrunning the fellow with the
small port 13B, so I will be doing a set of ports for him soon. We finished
the year in 9th place out of 28 starters. We turned our best lap time at Mid
Ohio. 1:39.226. and did a number of 1:39 laps. The engine is all junk parts
with some new side seals. It ran very well. I will be on the flow bench all
this winter. We need 30 more HP to run with the Nissans. The oil pressure was
sagging at the end of the longest straight. The oil tank was over full and
the scavenge pump was blowing bubbles in it and foamed it good. Sound
familiar?
When flow was high (9,500 RPMs) the pressure went down to 50 PSI. Then back
up to 85 on the rest of the lap. I also need larger than 1" ID line to the
suction side of the pump.
Lynn E. Hanover

That is interesting Lynn. Since I redesigned the oil pan I must make a 
new oil pickup tube. Should I go larger on the diameter?

Paul Lamar
 
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