The second chamber and its...
The second chamber and its ports have been through Leagon's Stage IIprocess, which can be compared to the third chamber which has beencompletely untouched. They look almost identical, but the performance onthe flow bench between the ports is quite significant.
We don't normally talk about cheating in the pages of Circle Track, butwhile working on this story the folks at Leagon's Racing Heads showed usa cylinder head that really caught our attention. This head has had itsNo. 2 combustion chamber ports modified and disguised in what RonaldLeagon will describe as the company's "Stage II process." We don't claimto be experts in this area, but it's one of the best jobs we've everseen.
"It's a tough situation to be forced to have to offer a product likethis," Ronald admits, "but there are so many series where we knowdrivers are racing against cheated-up heads. There are some racingseries that do not allow porting on the heads, and they do a good job ofkeeping that stuff out. But there are other series that say they don'tallow it--but if you are running by the rules you don't stand a chance.It's for racers that are in this situation that we offer this Stage IIprocess so they can at least be competitive."
The head Ronald showed us had one modified intake port while its brotherwas left original. The ports had almost exactly the same volume, but allyou had to do was feel with your index finger to know that the modifiedport was much improved. The shocking part was how hard it was to tellthe difference visually.
Naturally, nobody at Leagon's was eager to tell us the specifics on whatwas done to the head, but they did allow us to carry away a flow testcomparing Stage II versus stock intake and exhaust flow. Keep in mind,these numbers were obtained on Leagon's flow bench, but we have noreason to believe their numbers were doctored. For both ports, valveswere 2.020 intake and 1.600 exhaust, intake port volume was 200 cc andthe chamber volume was 64 cc. The flow numbers were derived at 28 inchesof water.