George Lendich wrote:

Have you been talking to Rolf or Jerry?

Why are you concerned with minimum area? The damned engine will run

with a

half inch hole in the rotor housing. The intake velocity will approach

super sonic.

Is that minimum enough for you?

We have two examples of P-port engines generating close to 300 HP

tested

on dyno's with two inch runners. One of which with fixed length

runners

dominated road racing road racing in the US for a decade where low

speed

torque

and engine response was and still is absolutely essential. Then

P-ports

were more or

less outlawed in US road racing as too powerful. Not fair to piston

engines.

Why don't you believe it?

Shessdsssssssssssssssssssssssssssssss!

Paul Lamar

Paul,
No conspiracy!!
George ( down under)

Did I say anything about conspiracies? Rolf and Jerry are not the only

people

advocating small runners out there. Tracy much to my chagrin also choose

the

low power, four port RX8 engine for his latest engine. Despite the stock
six port high power RX8  engine having 240 HP. Probably at the urging of

Bruce

Turrentine. A major mistake IMHO and so far Tracy has not gone any faster

than

his old 3rd gen engine.

Bruce's new manifold with the tiny runners is indicative of his thinking

on this

matter. These activities set us back years IMHO. Everett Hatch was going

20 MPH

faster ten years ago. The rotary clearly has a much better power to weight
ratio than any piston engine despite Mazda's excessive use of cast iron
for the end housings  but that will NEVER be demonstrated until people

start

tuning it right so it can produce the power it is capable of. Unless we

start

wearing these engines out we will never know what they are capable of.
What is inexplicable about this is Tracy has everything to gain and

nothing

to lose. Unless of course he really does not want to sell ten times
as many PSRU's and fuel injection computers. By comparison my next door
hangar neighbor Klause goes out and blows everybody away racing his

Varieze

and doing extremely well at Reno beating airplanes with twice the power.
He is selling electronic ignition systems like hot cakes. He is also
buying $200,000 hangars and one of the largest houses on one of the
highest hills around Santa Paula.

Pilots are stubborn like mules. Reminds me of an old joke. One farmer

sells a mule

to another farmer telling him it is the greatest mule in the world.
The second farmer brings the mule back in a few days and says; "I thought
you said this mule was the greatest mule in the world? I can't get him to

pull

anything let alone a plow." The first farmer picks up a 2 by 4 and smacks

the mule

on the butt and says "gitup". The mule takes off like a scalded cat. The

first farmer

says; "First you have to git his attention."

Paul Lamar

Paul,
You have my attention!
I'm looking at those Graphs you sent me and can't work out what D/B is - is
that Diameter V Length (B) ratio?
Also it's very difficult to read.
George (down under)

Yes D/B is the diameter of the intake pipe divided the bore of the piston engine.

Keep reading George. 

There is no direct correlation with the rotary. I uploaded
this stuff to illustrate the complexity of the problem. I am sure Mazda spent
millions on tuning the Le Mans, engine. Nobody anywhere is likely to improve
on it without a similar expenditure in dyno and fabrication time.

If you pick up a book on Fluid Mechanics you will not see this subject treated
as it is probably beyond even CFD. It is a transient phenomena not easily treated
mathematically.

Paul Lamar
 
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