Subject: Re: Oil pumps

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Thanks Colin, kind words.

We did some testing a little while ago with regards to the fluctuating oil pressure at higher engine speeds and while not finding a complete cure we did come to some conclusions.

1. the std pump design was cusing excess cavitation at higher speeds, this we proved on our test rig.
2. The pipework and std routing of the oil before and after the pump was also causing some cavitation, this disapeared on the test bed without the pipework with the modern internals but came back with the pipework.
3. With the new pump it was better up to a steady 40 psi constant. but if let to go too high (60+) the cavitation came back and caused the pressure to drop back to 40 or 45 psi
4. The standard pressure relief valve is prone to open due to engine harmonics if set at about 40psi. We had this on several standard engines but not on the 2.4 or on the test rig. and tried many springs but all did it if set in this range!
5. Probably many other reasons we will find out in time ;o)

Best regards,
Julian