English Racing Underdrive Oil Pump Gear - 4G63/4G64

English Racing


Fits these Applications:
1992-2006 Mitsubishi Lancer Evolution I-IX
1990-1999 Mitsubishi Eclipse GST & GSX, Talon TSi & Laser Turbo
4G63 & 4G64 Engines


The English Racing 4G63/4G64 Underdrive Oil Pump Gear has a larger overall diameter to lower the very high oil pressures the DSM & Evo engines reach and allows more oil to be in the pan where it should be to protect the engine!

Fits all 4G63/4G64 (DSM & Evo 1-9)
Must have Balance Shaft Deleted
Oil Pump Front Cover Requires Light Modification (Can be done in car)
Retards Cam Timing (about 2 Degrees)

Team English Racing FAQ:

Q. Timing belt?

A. Same as stock. Just reset the idler on the tensioner. requires minor trimming of the pump and cover to fit. Not big deal for the engines these are made for!

Q. How much does it drop oil pressure?

A. 1100rpm idle is 20psi, the pump doesnt exceed 90psi even with rolled bearings (deleted shaft). Cars that have a balance shaft delete but retain the shaft will be in the 80psi range which fits the old 10psi per 1000rpm rule even better.

Q. Why?

A. Reduced load on the oil pump will mean reduced failures of both pumps and engines.

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