Blake Mantel wrote:

Hi Paul and everyone,

I got a question for you....

How much horsepower can you get from a Turbo'ed 20B at say 2500 to 2700

RPM at a reasonable boost level running 100LL???

Thanks,

Blake
Cozy Mk IV Plans

You got me there Blake. I would guess less than 150 HP but maybe a bit more.
Not a good power to weight ratio as you have to add in the weight of exhaust
manifold and turbo. Course you would save the 35 to 65 pound weight of a PSRU.
As I under stand it the Power sport PSRU is 65 pounds and the Ross about
35 pounds. Tracy's is somewhere between the two.

David Doshay wrote:

It is far from optimal to run this kind of engine so slowly. Best hp per
fuel is in the 3500
rpm range, and I think that they should spin faster when you want real
power. After a
few years of driving my RX-7 I keep the rpm above 3000 for any constant
speed driving.
My data taking so far tells me that I get better mileage and much better
responsiveness
and driveability when I am between 3500 and 4200 rpm than when between 2500
and 3000
rpm. These engines are perfectly happy spinning at 5000 to 6000 rpm.

I am not flying the 20b that I have for the tail of my Velocity, but after
the automotive
experience I have had with the 13b in my car, I plan to spin the engine
faster. It seems to
me that something like a 2.17 ratio is about right, but slightly higher
would work too.

David

 
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