Landracing Forum Home
January 20, 2019, 03:34:51 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News:
BACK TO LANDRACING.COM HOMEPAGE
 
   Home   Help Search Calendar Login Register  


(Note: Donations are not tax deductible)







Live Audio Streaming and Archives of Past Events
Next Live Event: TBD
Pages: 1 [2]   Go Down
  Print  
Author Topic: Project Return of the MAC - Vintage 350cc Velocette build  (Read 911 times)
0 Members and 1 Guest are viewing this topic.
comet
Full Member
***
Offline Offline

Age: 46
Location: Kent, England
Posts: 188





Ignore
« Reply #15 on: January 08, 2019, 08:39:09 AM »

At least being shorter than you gut feeling you could have trimmed the pipe to suit. Better that way than trying to nail 2" back on again.  grin
Logged
thefrenchowl
Sr. Member
****
Offline Offline

Age: 68
Location: Great Britain
Posts: 315





Ignore
« Reply #16 on: January 08, 2019, 12:01:06 PM »

It's only a theoretical calc for exhaust length...

As a rule of thumb, one can also add:
Shorter = less torque/more power,
Longer = more torque/less power,

And bigger diameter = NO NO  grin

Most bikes I have seen in me time are always over-carbed and over-exhausted...

Sweetest Harley Sportster I ever had was a bored/stroked (from 900 to 1200) 1959 Iron head CH with std 36mm Linkert DC carburetor, 1"1/2 high level pipes, OEM std 57/58 small valve heads and 45 deg fixed advance magneto...

See ya,

Patrick
Logged

Flat Head Forever

...What exactly are we trying to do here?...
wobblywalrus
Hero Member
*****
Offline Offline

Age: 65
Location: backwoods Oregon
Posts: 4818





Ignore
« Reply #17 on: January 09, 2019, 10:10:17 AM »

At this stage it might be a good idea to have digital profiles made of your cams, flow test results from the cylinder head, a measured compression ratio, and rubber castings of the intake and exhaust ports.  Then, a virtual model can be made of the engine in an analysis program to figure out the answers.  The big benefits are getting the model, but more important, the things you learn about engines from reading the program user's manual and working with the example data sets that are included with the program.  This is a lot of "up front" work that saves time, money, and frustration in the long term.
 
Logged
Pages: 1 [2]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!


Google visited last this page January 19, 2019, 10:11:01 PM