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Author Topic: Project Return of the MAC - Vintage 350cc Velocette build  (Read 911 times)
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Age: 46
Location: Kent, England
Posts: 188

« 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
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Age: 68
Location: Great Britain
Posts: 315

« 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,


Flat Head Forever

...What exactly are we trying to do here?...
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Age: 65
Location: backwoods Oregon
Posts: 4818

« 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.
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