Kinsler_Handbook_#32 December 2017

206 Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. Phone (248) 362-1145 Fax (248) 362-1032 MANIFOLD DESIGN NOTES 1) Six cylinder engines resonate stronger than eight cylinder engines as they have three pulses that are evenly spaced, compared to four that are unevenly spaced. 2) Tuning effects end where the intake becomes common, at E. VARIABLE RESONANCE INDUCTION SYSTEM Typical of some advanced design passenger car manifolds in the 1990s. THEORY The length of the resonance tube F can be changed by opening either valve C or D.... only one would be used .... D giving a longer length then C. When a cylinder takes a gulp of air and the intake valve closes, the inertia in the air column makes the air try to keep flowing... it compresses down against the valve, then springs back, setting up a resonant pulsing, which can enhance or hurt the intake pressure available to the next cylinder gulping air. Mazda obtained a positive effect through most of the RPM range by using the engine electronic control unit (ECU) to close a valve like C or D up to 3000 rpm, where it opens until 5200 RPM, where it closes again. REFERENCE SAE Technical Paper #871977 Mazda six cylinder engine development RUNNER FORMULA How to calculate new length if you change the runner diameter but want to keep the engine ram tuned at the same RPM. Calculate “N” using your present lengths and diameters. After you change your diameters, work with the ramtube length to obtain the same value of “N”. Offshore Power Boat big block Chev with Kinsler 1-piece manifold. Lucas mechanical metering and staggered ramtubes. © 2017 L 1 L 2 L 3 = N D 1 2 D 2 2 D 3 2 + +