one common crankshaft, with the top arrangement of two camshafts (with the CVVT system). The engine has a closed-type liquid cooling system with forced circulation. The lubrication system is combined: under pressure and spraying. The cylinder head is made of an aluminum alloy. The drive of the camshafts is carried out by a toothed belt. The belt itself drives only the exhaust camshaft. The intake camshaft is driven from the exhaust camshaft by means of an internal chain located at the rear end of the cylinder head, as is the mechanism for changing the valve timing. There are no hydraulic lifters. Adjustment of valve backlash is required every 90,000 km. During 2001-2002, the engine made its debut in models such as the (XD) Elantra and (GK) Tiburon. Output is 138 hp (102 kW) at 6000 rpm with of torque at 4500 rpm. It has a cast iron engine block and aluminum DOHC cylinder heads. For the latest version the following changes were noted: Redesigned block with external contouring of cylinder bores (instead of flat sides), extra ribbing and one extra transaxle fixing point (now 5)(less NVH) Crankshaft now has 8 counterweights instead of 4.(NVH) Cast & ribbed aluminium sump pan (instead of pressed steel sheet) with stronger joint to transaxle (NVH) Reshaped combustion chambers, ports & pistons (performance, [fuel] economy, emissions) longer intake rams, 8% smaller surge tank, resonator added, spark timing and valve lift optimized, lighter valve springs, denser conrod bearings, returnless fuel system (instead of return type) with higher fuel pressure and smaller injectors (torque spread and economy) Cylinder head machined to more precise tolerances Head gasket now 2-layer (instead of 3) Idle speed reduced to 700 rpm from 800 rpm (NVH) Hydraulic engine mounts (4) instead of rubber (NVH) Heat shield installed between engine and air filter, reducing heating of induction air. New camcover with I-piece high-specific gravity polypropylene baffle (ilo 2-piece pp) Oil flow reduced (economy) Mechanical valve lash adjusters (solid lifters) replace hydraulic, improving valve clearance precision (durability). Lower valve spring load reduces valve train friction (performance). Engine cover installed (NVH and dress up engine bay) Catalytic converter now upstream adjoining exhaust manifold (ilo under car) (emissions) Other detail changes to: alternator, intake manifold brace, power steering & a/c pulleys, idle speed actuator, oil filler cap & drive plate between engine & torque converter In 2008 the Beta II was modified to produce and of