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Tractorsport Flowbench Forum Archive • View topic - Port velocity

Port velocity

Have an interesting technique, tool or just anything related to porting? Post it here . . . please no bashing anyone for the model of engine they are working, we're here to share ideas . . .

Postby Little Rocket » Sun Jun 24, 2007 3:01 am

How fast is too fast? I have a 4 valve head that is flowing 420 fps at the short turn @.28" of water. Every thing I have read says 300 fps is fast. The ports stock average 320 fps (averaged from 24 locations) After a days work flow is up 25cfm and speed is up an additional 30 fps average in the port.

Should I consider opening the port up more to slow the air down? I don't think so but I thought I would throw it out there.
Little Rocket
 
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Postby gofaster » Sun Jun 24, 2007 1:01 pm

Try adding clay to the floor ahead of the ssr, and to the roof above the ssr. Then try several tests, shaving off a little bit of clay at a time to see which direction this takes you. If removing clay steadily inproves things until it is all out of the port, then you will know where to start removing metal. If adding clay improves the port, then you need to build up the surfaces with weld or epoxy.
Or poke around with various sized flow balls to try to see what is causing the acceleration.
Jim
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Postby Thomas Vaught » Sun Jun 24, 2007 6:44 pm

Ford typically shoots for an AVERAGE port velocity of 300 ft/sec but a pitot tube will show that some parts of the port will be higher than others to get that average port velocity.

Tom V.
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Postby Little Rocket » Sun Jun 24, 2007 9:20 pm

Little Rocket
 
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Postby larrycavan » Sun Jun 24, 2007 9:35 pm

larrycavan
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Postby 1960flh » Thu Jun 28, 2007 10:56 am

As for clay I have found the Green Electricians clay sold at Home Depot the brand is GB it is oil based, never dries out and is very sticky. Cleans up well with WD40. Comes in a 1x2x8 bar.

Rick
HP = Torque x RPM / 5252
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Postby jsa » Sat Jun 30, 2007 4:29 am



I have not tried it in ports, yet.
Cheers

John
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