Thomas J Hankamp wrote:

Hello Brian or Paul,
I recently signed up for newsletter and get  "5 " copies of each

e-mail

!!! What can I do to correct this ??

Thanks in advance,
    Tom Hankamp
       pvnyejag2@juno.com

Scroll down and read the new parts of the messages added on at the end
in chronological order. If you still feel you are getting five copies
your ISP (juno.com) has a virus problem.

Paul Lamar

-Alex Madsen wrote:

Hi,
What equation are people using for PP intake manifold tuning?
My calculations do not seem to match what Paul and other have said.

I am assuming that one wants the low pressure pulse of the port opining
to reflect at the beginning of the intake and return as a high pressure
pulse to the port just before the port closes.

For a rough calculation I will just use one shaft revolution as the
durian of the intake.

Tuning for 6500 rpm at 0C speed of sound = 1087ft/s

1,087ft/s * 12in/ft=    13,000in/s

6,500r/s / (60s/min)=   108r/s

13,000in/s / (108r/s)=  120 in/r

Since the pressure pulse travels down the runner reflects and returns to
get runner length the total length of a cycle is /2.

So I get a runner length of 60 in

60 inches is much larger than the numbers I have seen other people
quote. Am I doing something wrong in my calculations? The second
harmonic of my runner length is 30in, which is in the same ball park
other lengths I have heard.

Alex Madsen

It is mostly from published data on intake length verse HP and RPM.
You have to add the fixed part to this variable part.

Paul Lamar
 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.