19 replies to this topic

[Redbaron6969uk]

I am about to buy an oil pump for my 1275 gt....occasional road use......what is the difference between the more expensive evolution pumps and the cheaper standard ones?

As such........do I need to pay £100.......or is one that costs £20 going to be adequate.......it seems to be a big difference for something with similar moving parts.

[carbon]

£20 pump more than adequate for most engines.

[03jkirk]

the evolution pumps are machined out of billet aluminium and have replacable intercomponents, they also have no risk of swarf as normal oil pumps are cast and can have rough edges and swarf which can make them less efficient if not checked and theres the slim chance of swarf coming loose and causing damage

[Dan]

The standard pumps do tend to be very badly made. in the interests of keeping costs down the spec was widened over the years so that the late Rover pumps would have been considered to be close to the limit of tolerance under the early spec.

[Redbaron6969uk]

Thanks guys..........would the turbo pump be a happy medium?

[03jkirk]

no the turbo pump has a high flow to keep pressure up while lubricating the turbo, u should always use a none turbo oil pump on a none turbo engine

[Redbaron6969uk]

Glad I asked then .........as I would have gone for the turbo....cheers

[03jkirk]

if you had gone for a turbo oil pump u would be trying to push too much oil through the engine giving youself too much oil pressure and possibly causing damage to the engine, they are high capacity because a turbo does not cause much resistance to the oil so much more has to be forced through to keep pressure

[Dan]

Well that's not quite true because the majority of the extra oil will simply flow through the PRV, around 60% of the output of even a standard pump runs straight through there anyway if memory serves. However pumping extra oil just wastes power and generates heat so turbo pumps are best avoided unless needed.

I haven't built an engine for a few years now but I always used Sureflow pumps. They aren't available any more sadly but given inflation the price was probably comparable to Evolution pumps. Oil pumps are important. How you build your engine is up to you but fitting parts that are almost worn out from new is not a good way to ensure longevity.

[bmcecosse]

Yes - get the metal backed pump. Worth opening it up and making sure it's clean inside - and of course prime it with oil before fitting. If the engine will stand for a while before being started - consider priming with 50/50 vaseline/oil mix to stop it all leaking away!

[MRA]

Swarf in your oil pump ? Im pretty sure that would be flash, this is part of the casting that is caused by worn casting mould tools.

As above bmcecosse (Roy) covers oil pump priming a very important aspect and must not be missed out, equally important is to cover all moving parts within the pump with grease (preferably a lithium engine building grease), this will increase the reliability of the pump to an acceptable level.

oils and greases have lots of uses..... one of which is to lubricate what is essentially a brand new DRY unlubricated oil pump.

Edited by mra-minis.co.uk, 02 February 2013 - 01:48 AM.

[MRA]

oils and greases have lots of uses..... one of which is to lubricate

I didn't need to repeat what had already been written about priming etc......

[Pigeonto]

The Metal backed are the better pumps in my experience.........

You can get a plastic one??

[MRA]

The Metal backed are the better pumps in my experience.........

You can get a plastic one??

No but you can get alluminium backed pumps

[bmcecosse]

And yes - aluminium is also a metal - we do of course mean STEEL backed pump.

Edited by mra-minis.co.uk, 02 February 2013 - 01:49 AM.
Inapropriate comment removed