As the power level goes up, so does the demand for airflow. Airflow and horsepower go hand in hand.
When the airflow demand exceeds the flow capabilities of the cylinder head, the engine goes into choke, peaks power, wheezes
out and falls off. The solution, larger ports and valves with correct shape and size become a necessity.
As you step into the Road Warrior series, all hardware (except the valve seats on the 1900) are replaced with new,
high quality, units.
As the name implies, the RW 1900 receives
a larger 1.900" intake valve.
This allows for an increase in airflow over the smaller
stock size valve providing airflow capabilities in excess of 100 hp (rear wheel). The exhaust valve is in stock in size, but
a better design, and is a perfect balance of intake to exhaust flow relationship.
Along with the new valves come a set of new beehive springs. Capable of handling .600" lift (.650" springs
are also available). Titanium retainers become a thing of the past with these springs. By design, the retainers are so small
with the beehive springs, that the weight of the retainers is simply not an issue, even at .650" lift.
Run down of the RW 1900:
Full porting of both intake and exhaust
AV&V 1.900" intake valve.
AV&V beehive springs capable of up to .600" lift.
New AV&V manganese bronze valve guides.
New AV&V viton valve seals.
Competition valve job.
Flow test with flow sheet.
|Stock intake port.
|Finished intake port.
|Stock exhaust port.
|Finished exhaust port.