Progress Thread 89 hatch hydroplanedrifterweldeddiff thread:

Foxslider said:

Ok, right on. Reading a book on head porting? Cool, you got it worse than me. lol. That book is tempting. I was gonna leave them as is with just the finish of the carbide burr, but i think i really need to go back with a sanding roll and make it a bit smoother after watching a bunch of head porting videos. Im just roughing them in near finish.

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Ha, my girl picks on me all the time for it. Most people like to read fiction books, I prefer to read technical/engineering books in my "spare" time. I must say, this book has been excellent so far.

And he did end up going over the purpose of the bump/vane toward the outlet side of the intake port in front of the valve guide, It has as very small effect on max flow but has more to do with wet flow characteristics and swirl. That bump/vane, combined with a slew of other minor changes to the port, encourages the charge to turn and swirl into the combustion chamber. He calls it a vane guide and if possible, you combine that with a longer vane guide in front of the valve guide that helps to split and streamline the airflow around the guide. You also scallop the area in the port to the right of the valve guide slightly (closest to the cylinder wall) which also helps to turn the charge more. I'd post a picture, but copyright restrictions prevent me.

I've found over the years that to really get proven, sound advice on these types of subjects, you must buy the books and do tons of research to weed out the bad information you get on the net. The people that really know what they are doing, get paid to know what they are doing as it's usually their job, and are not going to give out that information for free. I also like to know why a certain modification works, and not just that it does, so I can apply that knowledge to other problems. Just my exerience.