Table of Contents
Kinsler_Handbook_#32 December 2017
Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 63 THROTTLE STOP Fuel injection throttlestops, shafts, etc., are not made to take all the force that can be exerted with the driver’s foot at full throttle. A pedal stop should be made, set at approximately1/16”under the throttle pedal at lightly loaded full opening, to absorb excess force. THROTTLE LINKAGE ATTACHMENT The throttle linkage must be attached to the manifold at a point where it will pull directly against a throttle stop at full throttle. Avoid attaching the linkage where the full throttle force would go through a throttle shaft to get to the stop, as this could easily twist the shaft. UNEVEN FOUR BAR LINKAGE This linkage setup helps make a manifold or blower hat with very large throttles much more driveable for road racing or the street. Using the linkage in Fig 3, the first 30 o of pedal travel only moves the plates 15 o . The geometryreversesas it approacheswideopen throttle, so at 80 o of pedal travel the plates have rotated the required 76 o . Caution - The throttle spring must be on the driver shaft. Shaft-A can’t be the driven arm as it comes too close to over-center, the conditionwhere the centerlineof thehex link goes past the centerline of the driven arm... then the linkage can’t be pulled back. SHAFT ROTATION RATIO The shaft rotation ratio at any instant is determined by the ratio of the lengths of the perpendiculars to the Hex Link that pass through each shaft center. Example: In Fig 3, P B (1.10”) divided by P A (.250”) indicates 4.4 o rotation of Shaft A to 1 o for Shaft B in this position. HOW TO SET UP LINKAGE © 2017 !!! INCORRECT !!! Pulling arm on the oppisite end of the manifold from the throttle stop CORRECT Pulling arm installed next to throttle stop JACKSHAFT LINKAGE Counter-rotates the throttle shafts allowing the throttle plates to be installed with the lower edge of each throttle plate out toward the valve cover. This will direct the air the same to every port as the throttles are opened. Easy to set up and gives each shaft the exact same rotation. See Page #58, 65. CLEARANCE FOR LINKAGE No one ever got hurt because they had too much clearance! Consider the engine’s shifted position due to severe torque and vibration. Also consider body panel flexing. TOE KILL SWITCH Mount a spring loaded push-in ignition kill switch where the toe strap will contact it if the driver’s foot is pulled way back. Check it every time the vehicle is raced! TOE STRAP Make a sturdy strap for the throttle pedal that passes over the top of the driver’s foot so if the linkage sticks, he can pull it back. For Safety...
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