Kinsler Handbook #32 May 2025

Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 97 PLUMBING, ADJUSTMENT, AND OPERATIONAL NOTES. The Torque Valve is a bypass which opens and closes in a pressure range of Approximately: On 8-12 PSI Off 32-42 PSI. The primary purpose for the Torque Valve is to bypass fuel and lower the system pressure when the engine is at Wide Open Throttle and the engine RPM is lower than the point where Peak Torque occurs. When the RPM is below the peak torque region, the engines volumetric efficiency is lower and the required fuel is reduced. Excess fuel can cause a loss in lower RPM torque output and cause the engine to falter during hard acceleration. The Torque valve holds a “Jet” in the shuttle valve (be sure the jet size is facing you when you drop it in), (reverse flow), which controls the bypass volume and also the force exerted by the flow to move the shuttle and close “Off” the valve. At any constant flow rate, a change in the jet diameter will create a change in the applied force to the jet and the corresponding shuttle. Example: Changing to a smaller diam- eter jet will decrease the flow at a given RPM and increase the pressure / force applied to the shuttle. The shuttle in this example will now close at a slightly lower RPM. The opening “On” point, or initial bypass, of the Torque valve is controlled by an idle check valve located at the inlet. The idle check valve is intended to maintain the idle fuel pressure of an existing system so that the barrel valve will not require adjustment when the Torque valve is installed. The “Torque Valve” must only have clean fuel passing through it and back to the fuel tank. The valve is plumbed in parallel to the main bypass and should not see any back-pressure on the return flow path back to the tank. We recommend that this valve be plumbed via a separate hose to prevent changes in the return flow pressure that might be caused by any other bypass valves. “TORQUE VALVE” Typical 410 CID SB Chev , Tough Pump 500, Nozzle flow code 600, Methanol Kinsler Fuel Injection requires the following information to build and set your valve: a) Main jet can pressure c) Fuel Pump brand and size b) RPM Peak torque occurs at. d) A copy of your Dyno sheet is very helpful. This graph shows increasing pressure or larger orifice. The text below explains what occurs when you reduce the orfice size. © 2024