In JUN MACHINE SHOP, Solid type high camshaft for MITSUBISHI 4G63 engine were produced commercially, and sale was started.

These products are the things which have performed the wearing test over a long period of time in JUN SUPER HYPER LEMON EVO V other than a test on an engine bench, and the effect was proved from the street to the circuit run on the broad stage. It is taking into consideration equipping simultaneously as a camshaft kit and thought total balance as important.

4G63 engine has a lash adjuster for tappet clearance. This has advantages of maintenance free or silence by clearance 0, however, on the other hand, it has disadvantages of poor movement during the high rotation because of the oil pressure control. Therefore, 4G63 has a basic problem as a base engine for tuning. JUN MACHINE SHOP prepared solid type camshaft for corresponding to solid type head.

• When using this cam shaft, solid processing of rocker arm is needed.

When engine turns by high rotation, valve surging phenomenon happens so a valve becomes unable to follow to a motion of a cam. In order to prevent this phenomenon, the strengthening valve spring which raised the spring rate of a spring was developed. It corresponded to the normal cam shaft and JUN cam shaft, and considered as the design which can get the optimum load. When use a cam with the big amount of lifts, such as a JUN high lift cam shaft, you need the strengthening valve spring.

Strengthening a valve spring and using light weight valve retainer prevents valve surging. JUN VALVE RETAINER is used titanium material which has light specific gravity and high hardness. It was made very lighter than normal, without spoiling hardness.

By equipping with a CAMCHAFT, the valve spring for which exchange is needed, VALVE RETAINER, and theCAM SPROCKETwere released as the kit with reasonable. It can choose by budget or the purpose.