Cylinder Head Improvements
My mate here at work has just got a Bill Blydenstein head for his GTE (he's scared Im gonna catch him next season ;) )
Now the work done involves changing the shape of the ports and other things that experienced builders of single brand engines know from hundreds of attempts....so it's hard for you too see them....
BUT...you can see what THESE DO with no real brain power at all. The head has slightly BIGGER valves AND the angle the valves sit inside each port effects the SIZE of the port too...
PLUS..to keep resistance to a bare minimum, the valves are "machined" thinner....its a balance of thin and strong....you gotta have good quality valves and know where too STOP GRINDING...but the combination is THIS.
http://server3.uploadit.org/files/141103-valves%201.JPG
RED shows theangle of the OLD VALVES SEAT...the biggest area of this valve is the narrow bit....the reason valves are like this is EASE OF PRODUCTION and the long term seat they make in the head...reliable.
The BLUE on the new valve on the right shows the steep angle....see howmuch BIGGER the area of the air flow will be...WIDER :)
Next...ytou cant miss the stems :)
HOW DIFFERENT is THAT? hehe
The air flows AROUND those......the airflow in through the SIDE and then DOWN around thevalves (they gointo the head upside down to the this pic)
THAT is tuning:)