Multi-Stage Induction, Forged Pistons, Fuel Cooler

Multi-Stage Induction

Suzuki engineers also utilized Suzuki’s Multi-Stage Induction, which changes intake manifold pipe length according to engine rpm to enhance engine performance. e DF250SS utilizes two intake manifold pipes per cylinder; one operates at low engine rpm and the other takes over at higher rpm. During low engine rpm, air enters the combustion chamber through the longer, curved mani- fold pipe. e particular length of this pipe allows just the right amount of fresh air into the chamber to improve combustion and boost low-end torque.

As engine rpm increases, a valve on the intake manifold opens, letting air enter directly

into the combustion chamber through the short, straight intake pipe. is allows a greater volume of air into the chamber, increasing the engine’s ability to breathe at high rpm, thus improving high-end power output.

Multi-Stage Induction Module

Air Flow in Multi-Stage Induction Module

Lower rpm

High rpm

CloseOpen

Torque Curve

	with Multi-Stage Induction
(50N•m)
TORQUE	without Multi-Stage Induction
TORQUE
LOW	MID	HIGH

ENGINE SPEED (rpm)

Forged Pistons

e upper portion of each piston used in the DF250SS is treated with an alumite coating that increases heat resistance. A resin coating applied to the piston skirt improves resistance to wear and reduces friction.

Alumite coating

Piston	Resin coating

Fuel Cooler

e cooler the fuel the denser it is, and the denser it is, the more performance it delivers. e DF250SS incorporates a water - cooled fuel rail in the fuel delivery system. e fuel is cooled before it is injected into the cylinder resulting in better combustion and better performance.