Endurance Racers
- Thread starter SquadraCorse
- Start date
RedPlastic
make it rain bitches
Those cylinder heads are making me have impure thoughts!
Rocan said:
Using more valves decreases inertia by making each valve lighter than a smaller number of larger valves would be. It helps top end power. Clever valve arrangement can increase "tumble" as well. This increases turbulence within the combustion chamber which helps cooling and allows greater dynamic compression.
JustinLonghorn
No Purple Hearts, No Blue Ribbons
That baby blue scoot is going in my "Vault" for later use. Fantastic.
SquadraCorse
Coast to Coast
JustinLonghorn said:
Just wait until the winter when my FZR get's that paint scheme
The point is that it's possible to get more valve area for greater flow. It's almost impossible to get as much area with say 2 big valves. Yamaha discovered that 7 are not any more effective than 5 in the real world and are way more complicated to cast and machine the heads. There's a limit with vales and a rule of thumb is 34% of bore area. More than that loses gas velocity and charge density.
Tumble might be improved but probably with less Swirl and getting the gas to go around to those port makes for a circuitous gas path with lower efficiency than a straighter more direct route.
It was a great experiment and without it, we would have never known the answer to that question.
Tumble might be improved but probably with less Swirl and getting the gas to go around to those port makes for a circuitous gas path with lower efficiency than a straighter more direct route.
It was a great experiment and without it, we would have never known the answer to that question.
