Posted by wi50 on October 13, 2013 at 04:53:20 from (70.194.64.42):
In Reply to: porting tools........ posted by baldwin racing on October 10, 2013 at 04:11:28:
Cylinder Head Supply also known as Woodward Equipment has a good selection of tools. I buy a lot of "flame shaped" carbides, they are shaped like a flame or tear drop to allow cutting around a corner to leave a longer radii.
I use a Superflow flowbench, a set of flow balls and flags, I've got a set of petot tubes for measuering air speed.
I've read a lot of stupid posts on here where someone was bragging about supersonic air speed....... well some people are clueless in the real world ans should best stick to fictional writing for entertainment purposes only. I've seen some pretty messed up port jobs and like Cody says, huge valves for dinkey manifolds and carbs. I've tested some fairley big name and expensive port jobs from around the country, I think some people pad their pockets and customers think spending more $$$ is better.
Shape is more important than size. Every "orfice" meaning port oe valve seat area has a certain coefficient of flow. The shape of the orfice or port has more to do with it than the size. The inlet to the orfice and the outlet will greatly effect how the individual orfice flows. The exit past the valve is verry important. If there's a chamber what can be done to help the air discharge into the cylinder or the exhaust discharge into the valve and port?
Most people should use their checkbook to poer their parts, if they really want to learn and do it themselves then find someone willing to spend some time on the flowbench and teach a little. Spend some time makeing the custom adapters needed to flow the parts and doing research rather than hacking away. Then learn a little and work on the parts.
I'll look at all the parts in the induction system and then start to figure out what can be done, what things should do and start to make comprimises depending on the given application and set of rules. It's not a perfect world and these tractor engines are far from perfect platforms to start with but the challenge is fun.
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