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Nov 21, 2019 12:31 am
Nov 21, 2019 12:31 am
Subject: Re: 2ltr oil pump and pressure
Some years ago John Batt demonstrated to me the flow from a 2 Litre oil pump. Using two buckets, one with oil in it and an electric drill with a wire brush on the drive dog on the pump, the volume shifted within seconds was astonishing! However, Julian on this forum says the 2 Litre oil pump has a cavitation flaw and a few years ago he designed a replacement to overcome this. My pump since being fully rebuilt has covered around 7k miles but I will check it for wear.
Your comments about flow rate and velocity are interesting.
The design of the oil distribution block which takes the initial flow from the pump is such that neither flow nor velocity to the centre main bearing would be impacted negatively if you reduce the bore of the take off oil way to the timing chains. But as you say there is a risk that you could starve the chains!
It was only a hypothesis that John put forward trying to explain the differences in oil pressure between 2 Litre engines. It certainly wouldn't be the only reason as each engine will wear differently due to the type of use it has had and its maintenance regime.
At the end of the day I could overcome oil pressure concerns permanently via the Alan Brown Method... cut 2" diameter duct tape circle and apply to face of gauge!
Some years ago John Batt demonstrated to me the flow from a 2 Litre oil pump. Using two buckets, one with oil in it and an electric drill with a wire brush on the drive dog on the pump, the volume shifted within seconds was astonishing! However, Julian on this forum says the 2 Litre oil pump has a cavitation flaw and a few years ago he designed a replacement to overcome this. My pump since being fully rebuilt has covered around 7k miles but I will check it for wear.
Your comments about flow rate and velocity are interesting.
The design of the oil distribution block which takes the initial flow from the pump is such that neither flow nor velocity to the centre main bearing would be impacted negatively if you reduce the bore of the take off oil way to the timing chains. But as you say there is a risk that you could starve the chains!
It was only a hypothesis that John put forward trying to explain the differences in oil pressure between 2 Litre engines. It certainly wouldn't be the only reason as each engine will wear differently due to the type of use it has had and its maintenance regime.
At the end of the day I could overcome oil pressure concerns permanently via the Alan Brown Method... cut 2" diameter duct tape circle and apply to face of gauge!