Port velocity

[Little Rocket]

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.

[gofaster]

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.

[Thomas Vaught]

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.

[Little Rocket]

[larrycavan]

[1960flh]

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

[jsa]

I have not tried it in ports, yet.