NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   Exhaust diffuser and porting in progress (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/exhaust-diffuser-porting-progress-64770/)

ChainSawOnSteroids 03-17-2007 11:25 AM

Ok diffusers are out already now i need to port them, pics coming in a minute. need help on port size and shape

ChainSawOnSteroids 03-17-2007 11:26 AM

well heres the rough beginning:



https://i115.photobucket.com/albums/...330/img035.jpg



https://i115.photobucket.com/albums/...330/img036.jpg



https://i115.photobucket.com/albums/...330/img037.jpg



https://i115.photobucket.com/albums/...330/img038.jpg

ChainSawOnSteroids 03-17-2007 11:27 AM

what now? lol

ChainSawOnSteroids 03-17-2007 02:47 PM

here are the pics after porting, templates were not used, free hand



https://i115.photobucket.com/albums/...330/img039.jpg



https://i115.photobucket.com/albums/...330/img040.jpg



https://i115.photobucket.com/albums/...330/img041.jpg



https://i115.photobucket.com/albums/...330/img042.jpg



what do you guys think???

ChainSawOnSteroids 03-18-2007 08:46 AM

Well??? What do you think???

iceblue 03-18-2007 10:05 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.

ChainSawOnSteroids 03-18-2007 10:43 AM

Over lap is not a concern for me, since the motor is bridge port.

My bevel is not good? WHy square off the port?

Lynn E. Hanover 03-18-2007 12:53 PM


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

iceblue 03-18-2007 06:24 PM


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.

ChainSawOnSteroids 03-18-2007 08:56 PM


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 https://www.nopistons.com/forums/pub...#>/bowdown.gif

Im just a bit afraid of hitting the water passage.


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