Cheers Thom and Tony, I have enjoyed sharing especially when you guys show so much appreciation and give great feedback.
I have ported heads on a mild scale for a long time and only had seat of the pants judgement on if it goes better, Porting without a flow bench you really are just guessing, you can have an educated guess and make improvements for sure. Once you use a flow bench you start to find out what was just a waste of time, some of the things I've done in the past didn't hurt flow but didn't improve it either and once I started mapping the port velocity it really only took small changes to the port shape to make a big difference, simple things like throat percentages, blending the seat into the throat and the seat itself are all things that can be done that will give good results without needing a flow bench, plus I will be sharing things that you guys can do at home that I will prove on the bench before posting them up, plus things that I can show don't work to save people some time and money.
Thanks guys for your interest and positive comments, I have shared things on other forums about what I'm doing but not to the same detail as here as I think this group is the best of the lot and I feel the urge to take the extra time to share the details with you.
I thought I would start a separate thread for the head port I'm working on for the race head I'm going to be doing for a proddy speedway car.
This port is a C1A casting, and the results are using a stock standard crossflow intake valve, 1.8in single cut valve. The port has a 3 angle seat cut that is a little worn but still usable. So the first test was on the port as cast from the factory with the 3 angle seat cut, the second test is with the port ported and the third is with the port work plus the chamber work.
this is the stock valve I'm using
Stock combustion chamber and reworked chamber, not much needed here, just laying the edge over and blending to form a nice smooth shape, you have to take the point off the end of he swirl generator to stop pinging.
This is the port work, hard to explain what I have done but most of the work is at the short turn and bowl area, I mapped the air velocity of the stock port to determine what material and shape needed to be used, the port responded well to being biased to the right.
So as you can see the results are reasonably good, the chamber work plays a big part of the power potential, this head now has a flow potential of 330hp using the stock standard intake valve.
Hope you find this interesting.
