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 85 3084 Main bypass valve, Kinsler 6 AN High-Flow brass jet can, for gasoline and methanol 3085 End cap ONLY, for model: 3084 High Flow Brass jet can 3155 Main bypass valve, Kinsler 6 AN High-Flow hard-anodized aluminum, for gasoline and methanol 3150 End cap ONLY, for model: 3155 High Flow hard-anodized aluminum jet can 3087 Poppet, for #3084 and #3155, precision ground stainless steel 3074 O-ring set, for #3084 and #3155 end cap, gasoline and methanol ONLY 3083 O-ring set, for #3084 and #3155 end cap, for any % of nitromethane MAIN BYPASS VALVE The main jet is the most basic adjustment of a constant flow metering system. A smaller main jet makes the engine richer, by allowing less fuel to flow back to the tank and forcing more fuel to go to the engine. A larger main jet makes the engine leaner, by allowing more fuel to flow back to the tank which means less fuel flows to the engine. Regarding jets: see section on “K-TYPE JETS” and “ORIFICE- THEORY”. This valve also acts as a check valve to hold pressure for starting and idling. We highly recommend plumbing this valve after the fuel filter, since any dirt or sticking may cause the engine to idle poorly or possibly not start (see Kinsler’s PREFERRED PLUMBING SCHEMATIC on Page #108). Note: It is important to carefully read the section on “HIGH-SPEED BYPASS” on Pages #86-90, so you will understand the relationship between the two bypass valves at wide open throttle. #3155 6 AN High-Flow hard-anodized alumi- #3084 6 AN brass high-flow When you drop the jet into the end of the main jet can, make certain the number is facing you In the most basic fuel injection system, flow increases directly with RPM, resulting in a curve that is theoretically a straight line. In actual practice, internal leakage in the pump would alter the shape of the curve slightly (see schematic at right). The output of the pump is split between the nozzles and the main jet. A larger main jet leans out the engine because it allows more fuel to return back to the tank. FUEL FLOW DELIVERY OF SIMPLEST SYSTEM (pump, nozzles, and main jet can ONLY) Running clearance is a must for the pump gears. This clear- ance causes some internal leakage back past the gears and has the same effect as a bypass from the pump outlet back to the inlet. While internal pump leakage must occur, we do NOT recommend plumbing any bypass valve’s return flow back to the pump inlet. #3112 ‘Ano-QD’ quick disconnect valve NOTE There is no one o-ring compound that works well for gasoline, methanol, and nitromethane. We therefore use one o-ring compound in the gas/methanol jet cans, and a different compound in the methanol/nitro jet cans. Using a fuel or additive other than that specified may cause swelling of the main body o-ring, or leakage due to shrinkage of the o-rings. When the main body o-ring swells, it may be difficult to uncouple the valve. Contact us for the proper o-rings if a fuel other than the ones specified is being used. © 2024 SCREW TOGETHER VALVES AND COMPONENTS 3112 Hard-anodized aluminum, model: Ano-QD, 6 AN male flare, for gasoline and methanol 3115 Same as #3112 but with o-rings for use with nitromethane 3101 End cap, for quick disconnect, hard-anodized, includes jet sealing o-ring 3036 Poppet, Kinsler hard-anodized, for Kinsler and Hilborn 6 AN jet can 3319 Spring, .019” wire diameter, standard spring for Kinsler main bypass valve 3116 O-ring, jet sealing, for end cap #3006, #3104, and #3112 3117 O-ring set, for quick disconnect, gasoline and methanol ONLY 3119 O-ring set, for quick disconnect, for any % of nitromethane QUICK DISCONNECT VALVES AND COMPONENTS