Oil Pump

[bcmc33]

For my new engine I'm looking for a high capacity pump but can only find them as high pressure pumps - and I don't want that.

Any suggestions?

[rgh0]

A high capacity normal pressure (40 psi) pump would be a waste of time which is why they are not available normally. The pump would be relieving its extra capacity rather than send it through the engine as you need the higher pressure to get the extra oil volume through the engine unless it has excessive bearing wear.

If you had real need for one ( maybe for a short term fix to achieve acceptable oil pressure in a worn engine) you just need to swap the spring from a normal pump with the relief spring in a HP/HV pump to turn it into a HV normal pressure pump. Have a close look at the relief valve desing to ensure the installed length of the spring s in both pumps is the same before attempting such a swap.

regards
Rohan

[stugilmour]

Hi Brian and Rohan. I was just Googling John McCoy of of Omnitech Engineering and came across this article from last year. Might be of interest to Brian; just reading all the material now myself. If I recall the plot correctly Brian, you have a pretty serious build on the go. Not sure of clearance in an Elan at the motor mount area? The other two links were in the first Lotus ReMarque article (club magazine of the US Lotus Ltd). Rohan, I imagine this would not be allowed in your vintage class, but the concept is kinda cool John also seems to have a wet sump pan & baffle tray on the go as well that would be part of the 'system'.

http://www.omnitech-engineering.com/aut ... p10-11.htm

http://johnsonsoilpumps.com/articles_frame.htm

http://www.omnitech-engineering.com/aut ... l-pump.asp

I have one of the high pressure Burton pumps that is 'surplus to my needs' if you want to try one. My road use motor seems to be way happier without it though, and sounds like Brian is not after one.

[john.p.clegg]

Brian(friend)

You have pm...

John

[cabc26b]

Stu and Brian -

There is plenty of clearance with the johnson pump. There is a bit of work involved though ( and money) over the stock set up.

[bcmc33]

A high capacity normal pressure (40 psi) pump would be a waste of time which is why they are not available normally. The pump would be relieving its extra capacity rather than send it through the engine as you need the higher pressure to get the extra oil volume through the engine unless it has excessive bearing wear.

If you had real need for one ( maybe for a short term fix to achieve acceptable oil pressure in a worn engine) you just need to swap the spring from a normal pump with the relief spring in a HP/HV pump to turn it into a HV normal pressure pump. Have a close look at the relief valve design to ensure the installed length of the spring s in both pumps is the same before attempting such a swap.

regards
Rohan

Rohan,

I'm just testing for opinions - I have to admit that if I had thought it a good idea to get a HP/HV pump and play with the relief valve, I would have done it by now.
The new 1600 block has been bored to TC standard and decked to suit a 420 flowed head, and the crank has been ground to -10 top limit, so a new standard pump should suffice.

However, if a 'cheap' HP/HV pump becomes available sometime, I may take time out to have a play.