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Exhaust diffuser and porting in progress

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Old 03-17-2007, 11:25 AM
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Ok diffusers are out already now i need to port them, pics coming in a minute. need help on port size and shape
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Old 03-17-2007, 11:26 AM
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well heres the rough beginning:















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Old 03-17-2007, 11:27 AM
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what now? lol
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Old 03-17-2007, 02:47 PM
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here are the pics after porting, templates were not used, free hand



















what do you guys think???
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Old 03-18-2007, 08:46 AM
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Well??? What do you think???
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Old 03-18-2007, 10:05 AM
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I say square the port off more at the top and work the bevel edges to flow characteristics and seal life. The scribe looked like a good port shape. Should be a nice exhaust port.



That port has allot of overlap you might want to not take allot out of the intake ports with this one.
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Old 03-18-2007, 10:43 AM
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Over lap is not a concern for me, since the motor is bridge port.

My bevel is not good? WHy square off the port?
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Old 03-18-2007, 12:53 PM
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Originally Posted by iceblue' post='864099' date='Mar 18 2007, 08:05 AM

I say square the port off more at the top and work the bevel edges to flow characteristics and seal life. The scribe looked like a good port shape. Should be a nice exhaust port.



That port has allot of overlap you might want to not take allot out of the intake ports with this one.




Read the tech section about exhaust porting on Paul Yaw's website. WWW.yawpower.com





Lynn E. Hanover
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Old 03-18-2007, 06:24 PM
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Originally Posted by Lynn E. Hanover' post='864117' date='Mar 18 2007, 12:53 PM

Read the tech section about exhaust porting on Paul Yaw's website. WWW.yawpower.com

Lynn E. Hanover
Yeah its a good article Paul is truly a seasoned man.
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Old 03-18-2007, 08:56 PM
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Originally Posted by Lynn E. Hanover' post='864117' date='Mar 18 2007, 12:53 PM

Read the tech section about exhaust porting on Paul Yaw's website. WWW.yawpower.com

Lynn E. Hanover


Thank you Lynn

Im just a bit afraid of hitting the water passage.
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