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benny
Re: Why are exhaust ports square??
#1
No life (a.k.a. DattoMaster)
Joined:
2002/6/14 7:24
From Sydney
Group:
Registered Users
Posts: 2598
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I have a copy of "Four-Stroke Performance Tuning "
by A. Graham Bell

And I do recall a chapter on port shaping. It stated that the best shape for exhaust ports is a "D" shape with the flat section as the floor of the port. I guess a square port like the one in the A-series head is a step in the right direction of performance . From memory it had something to do with gas velocity is better with the flat floor port.

BTW the book is a great read and rather easily understood. All is explained from induction to exhaust and everything in between, aswell as gearing.

benny

Posted on: 2007/6/27 22:26
Transfer the post to other applications Transfer

Subject Poster Date
     Why are exhaust ports square?? qik1000 2007/6/25 6:54
       Re: Why are exhaust ports square?? matbighat 2007/6/25 7:12
         Re: Why are exhaust ports square?? short-coupe 2007/6/25 8:26
           Re: Why are exhaust ports square?? Ash 2007/6/25 10:24
           Re: Why are exhaust ports square?? qik1000 2007/6/27 12:10
             Re: Why are exhaust ports square?? ddgonzal 2007/6/27 16:24
               Re: Why are exhaust ports square?? benny 2007/6/27 22:26
                 Re: Why are exhaust ports square?? GB 2007/6/28 12:28
                 Re: Why are exhaust ports square?? Dundee1000 2007/6/28 13:55
                   Re: Why are exhaust ports square?? Rallytwit 2007/6/28 15:13
                     Re: Why are exhaust ports square?? Daveman 2007/6/28 15:52
                       Re: Why are exhaust ports square?? kululadotgroen 2007/6/28 21:26
                 Re: Why are exhaust ports square?? qik1000 2007/7/2 13:07
                   Re: Why are exhaust ports square?? Dodgeman 2007/7/2 13:43
                     Re: Why are exhaust ports square?? qik1000 2007/7/3 12:41




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