Paul Carey wrote:

Hi Paul

Thought I would fill you in on the progress of my 20B drag engine (I

know it's not an aviation installation, but the info may be good).

I did a PP job on the 20B, 53mm bore with squared lower corners,

reasonably low in the housing. Three 18" equal length 55mm ID runners, with
6 constant flow injectors in the runners, three for idle,

three over 4500rpm. 8/71 blower with only 4 small nozzles in the hat,

instead of 8 and 10. Engine started first go, and was basically the same in
sound and feel, just a little rat tat tat just off

idle of 2000rpm. First run was amazing - the difference in power and

torque was substantial, compared to the side port. We have instantly taken a
second off our times. The interesting part in the

engines ability to breath. Previously, 3% under blower drive gave 36lb

boost, and 3% over gave 45lb plus. The new PP at 3% under was 20-25lb, and
changing to 3% over made no difference. Now you know

that boost is only a measure of the air an engine cannot consume. Better

breathing - lower boost. This PP just ate the extra air easy, and we plan on
upping the blower drive until we get the 45lb

again. That means more air - more fuel - more power.
Once this engine has settled down, I move onto the Power Turbine. Now

that is going to be fun.

Regards PC

Paul Carey
Aero Group Pty Ltd
226 Railway Parade, Bayswater WA 6050
P.O.Box 119, Maylands WA 6930
Ph: (08) 9371 5205  Fax: (08) 9371 9644  Mob: 0418 959 892
www.aeromanagement.com.au

Now that is some decent size P-ports :)

Paul Lamar

Hey Paul,

what kind of rpm are you running with these monsterports? Any HP readings? I
hope this is all "non-confidential!!"

Thomas J.

 
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