JUN Stage 2R Camshaft Set Mitsubishi EVO X 08+
The cam profile which influences the performance of a camshaft is the most important element in a camshaft design. At JUN, a software for only cam profile designs is used, and the automatic design by the computer is performed. In order to test the cam shaft, the engine bench system of JUN which has a combustion pressure measurement, equipment is used. This system can analyze the state in a combustion room for all crankshaft angles. Various profiles can be tested.
Even if it says a camshaft, the profile form is various by the type of a car. Profile form is decided in consideration of the difference in valve motion method etc. (direct type, a locker arm type, strength of moving part, valve size, port and combustion room form). If depending on types of a car, a profile may be restricted by the wall in a head, lifter hole size, locker arm form, etc. At JUN, when developing a high camshaft, the detailed data for each type of a car is taken, development is furthered simultaneously with a valve spring and retainer, and the optimal profile is determined.
In order to manufacture a highly precise camshaft, it can be said that the cam grinder is indispensable. At JUN, the CNC master less grinder with high processing accuracy was introduced from the early stage in the camshaft manufacturing. Since the camshaft grinder of JUN can input the program data of a cam profile very finely, it can grind in the cam profile based on a design. The quality control is performed on the high standard like other products. The user is provided with an end product of high quality.
You have to raise "filling efficiency" in order to obtain a high output. It is necessary to increase the amount of cam lift in order to lengthen time which the valve is open. The negative acceleration will become large if the amount of lift is increased. The "jumping phenomenon" in which a valve separates from a cam, and the "bounce phenomenon" which is bounded when a valve contacts a valve sheet ring occur because when negative acceleration becomes large, the acceleration of a valve will exceed the acceleration of a cam. These phenomena not only spoil the engine performance, but also cause engine breakage. The high camshaft must realize the conflicting element with which "extension of time which is opening the valve", and "reduction of negative acceleration".
JUN high camshaft took positive acceleration, and the action time of negative acceleration to keep a long time by shortening positive action time. By doing so, when a valve moves from opening operation to closing operation, a valve can move in a smooth operation and can prevent jumping. Since positive acceleration becomes large at the side of close, the valve, just before closing, is added the strong brakes by the cam. The bounce phenomenon is prevented. The time near the maximum lift can be kept for a long time by opening a valve in a short time. Therefore, the good valve motion of efficiency is possible. The simulation and an experiment of the valve motion system are conducted based on such design theories, and a profile is determined. Here is the true performance for which a high lift camshaft is asked.
Stage 2R Camshaft Set includes Valve springs & Type 2 Retainers and comes with optional Intake and Exhaust Durations and Lifts. Please review the chart and select from the drop down below.
JUN Machine Shop of Japan is world renown for producing some of the fastest vehicles with their highly engineered tuning parts. Having proven themselves with such JDM supercars as the Nissan Skyline, JUN also has won many records drag racing the Honda Civic, time attack events with Subaru, and more. Vivid Racing is a direct dealer of JUN Auto Parts and ships direct from JUN to you the customer.