Remark: For RB25&20 solid type engines ONLY!
OIL Restrictor
The Orifice controls the amount of oil flow that is delivered to the head to lubricate the parts in the cylinder head and to cool down the engine assembly. However the stock oil-gallery orifice has a hole that is too large which allows too much oil to be delivered to the cylinder head which will cause the problems as listed below.
(1) Too much blow-by Gas,
(2) Blowing engine oil,
(3) Leaking oil through the valve guides,
(4) Insufficient oil delivery to the crank journal,
(5) Allows air pockets into the system from when the oil pan is under horizontal G-Forces.
The TOMEI oil gallery orifice was designed from the experience and data we had obtained from the development of our N1 endurance and drag racing engines. By restricting the diameter of the orifice to φ1.5mm (Normal is φ2.0mm) we succeeded in securing enough lubrication to the camshaft and valve while maintaining the correct amount of oil in the oil pan which resolved the common problems. (For added Blow by prevention, we recommend using the TOMEI 3D Profile pistons.)
Tomei
TOMEI POWERED (TOMEI MOTOR Inc.) Was founded as a company which specialized in professional racing by Seiichi Suzuki who was known as a driver for Nissan Motor Works in 1968.
From that time Seiichi Suzuki who was also and excellent tuner helped to achieve high scoring results in numerous races and made many legends.
Stories in which is still handed down as one of Japans historical race.
TOMEI have been involved in various competition levels from Touring cars to Formula Cars and the D1GP series.
From the past, present and the future, TOMEI continues to compete in motor sports and develop superior tuning products.
