My motor is a relitively mid combo consisting of a custom set of je,s with a modifyed compression height,a stock length carrilos,"small in racing terms" a web 378 intake cam with a stock intake on the exaust side,they are degreed at 106,108.I hand ported the head myself concentrating on velocity,instead of volume.I started by leaving the runner in front of the intake guide,and raiseing the roof slightly trying to create a slight turn into the bowl area,in where i worked the short turn radius and increased the bowl area silghtly.My theary was to speed up the air on either side of the guide in hope to increase velocity.I have seen on many of heads where the guide boss was removed completly up flush with the roof.I am not a head porter by no means,but i have seen alot of aftermarket automotive racing heads ported,and have flowed alot of heads myself.I think that velocity,not volume will make better power through the powerband,especially at mid lift since the valve will travel through mid lift twice,once on the way to peak lift and once to closeing.On the exaust side i did remove the runner and raise the roof slightly trying to create a smooth radius ot of the cylinder head,in theory that if i filled the cylinder with more volume by velocity,i would need a larger port to evacuate to cylinder.I know that there are alot of varibles that contribute to volumitric effencity.My bike is a full weight busa sitting at 64"On my first pass i left with a 1.51 60ft.went 123 in the 8th and 152 out the back,spinning from the 8th out.My datalogger also showed me a interisting thing,small spikes in rpm showing me that my clutch was also slipping!My goal is to put bigger cams with more duration and lift and see how fast a stock stroke motor can go wtih my knowledge.I want to raise the rev limiter and spin it up.I am reaseraching on how to do that now.I AM A RACER THAT WANTS TO GO FAST.I am not a engine builder.so any help towards my goals will be appreciated!
