The valve operates to create three specific first-order resonant frequencies that increase cylinder air charge. rpms) to produce optimal torque/horsepower output at any given engine speed. The valves actuate at particular engine frequencies (i.e. A series of two butterfly valves coupled with electronically controlled actuators varied the volume and length of a resonant chamber within the intake manifold. Mazda introduced a key technology with these engines, known as the Variable Resonance Induction System (VRIS). The distributor was replaced with a Ford EDIS coil-pack ignition. It featured solid lifters, a cast crankshaft to reduce rotating mass and a reworked intake system. In 1998 a revised version of the KL known as the KL-G4 was used in the 626. Another variant, the KL-DE (also known as the KL-03 outside the US, and fitted to 2.5-litre Ford Probes) was the worldwide version, with 164–174 bhp (122–130 kW 166–176 PS) in various applications. The KJ-ZEM was on the Ward's 10 Best Engines list for 1995 through 1998. The supercharger used is the twin-screw type with electronic boost control. It employs the " Miller cycle" which uses a supercharger to increase compression efficiency by decreasing the compression losses (i.e., flywheel energy used to compress the intake charge in the cylinder) and thereby increasing the net power output of the V6. The 2.3 L (2,255 cc) 80.3 mm × 74.2 mm (3.16 in × 2.92 in) bore and stroke, KJ-ZEM was one of Mazda's most technologically advanced engines. The displacement was held under 2000cc to minimize the annual Japanese road tax obligation. It was a DOHC 4-valve design with VRIS and a bore and stroke of 75 mm × 69.6 mm (2.95 in × 2.74 in). The 1.8 L (1,845 cc) K8 is among the smallest production V6 engines ever and also the first K-series engine to be used in a Mazda car (in the Mazda MX-3). The KJ-ZEM Miller cycle engine had a 6,000 rpm redline, but was only available with an automatic transmission. The K-series all have a 7,000 rpm redline with 7500-7800 rpm limiter, which given the engine design is conservative. VRIS is used on the K8, KF, and KL but nearly all modern Mazda V6s are now using this technology. This effect optimizes volumetric efficiency over a given rpm range to provide maximum torque over the entire rpm range. The computer dynamically switches between each resonant chamber to achieve the appropriate resonant frequency for the engine's rpm. Based on the Helmholtz resonance principle, the intake manifold is equipped with 3 chambers tuned to a specific resonant frequency. One unique innovation of the K-series was the introduction of Variable Resonance Induction System ( VRIS). They were designed with the intent of being as compact as possible for short-hood front-wheel drive applications. The K-series also features a highly rigid aluminum split-crankcase engine block design with 4-bolt mains with additional bolts securing the lower block, an internally balanced forged steel crankshaft with lightweight powder forged carbon steel connecting rods. ![]() ![]() They all use a 27-degree DOHC valvetrain with directly actuated hydraulic bucket lifters. ![]() ![]() The Mazda K-series automobile engine is a short stroke 60° 24-valve V6 with belt-driven DOHC and all-aluminium construction. Reciprocating internal combustion engine Mazda K engine
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |