9 replies to this topic

[unburntfuelinthemorning]

I don't like the idea of the ball valve in the oil filter head opening and letting unfiltered oil into the oil gallery.  I can see why it's there as a blocked oil filter would restrict the flow severely and unfiltered oil is better than no oil at all,  however the spring has very little resistance so how much would it take to allow oil to bypass the filter say when the oil is cold. 

 

A better solution would seem to be to omit the bypass valve in the filter head and fit a much larger filter.  This would really require remote mounting of the filter.  What filters then become available?

[dotmatrix]

interesting topic. I have asked questions about this bypass valve in the past. as you probably know you can buy machined filter heads to be mounted on the block that takes the standard filter but does't have the bypass valve so I am hoping that someone in that industry has done their research and found that the oil while cold or dirty will still be circulating properly.

[unburntfuelinthemorning]

I can understand the need for it for those who delay servicing their vehicles and end up with blocked oil filters and horrible oil as at least something reaches the bearings then.

 

If it opens too readily though just because the oil is cold then it seems that what is really needed is a much larger oil filter that will handle the quantity of oil needing to flow through it whatever the temperature.

[nicklouse]

you can also braze up the ball in the standard head. AC has done a few.

[grizzler73]

I have a remote filter head for the GTM racer with no by-pass, I am running it before it gets to the pump to help pump life, you do need a Late A series block to do this so you can tap the holes in the block.

By-pass is a moot point as I will change the oil every few races, I guess roughly the same applies (change oil regularly) to people with road going Minis that would like to have a healthy engine/box!

S

Edited by grizzler73, 22 May 2019 - 09:21 AM.

[Spider]

All spin on filters and many of the cartridge types has a built in by-pass in any case, however, while I don't have the specs on them, they would open at a higher pressure than that in the filter head.

[Earwax]

From my limited googly knowledge, the oil filter is matched in pressure range /  pressure release valve opening and volume as specced at OEM . On the standard 'small' spin on filters the bypass is usually specced at 8 PSID  ,,, so when the pressure differential between outflow and inflow is 8PSI  then the valve will release,  on larger units that are often fitted in remote oil filter setups on the same mini, the bypass reference is 30  or similar PSID..... a bigger differential before the valve kicks in,,, this is (in my layperson's opinion) largely due to the flow requirements still being met due to the larger surface area of filtering media.  So this agrees with unburnts statement above.

 

 

 Apart from physical dimensions and thread sizes some of the more important filter info, such as do they work! is harder to find.    It requires a phone call or two to the support line at the aftermarket manufacturer.. so you know what pressure the bypass kicks in at and what volume is to be pumped. The other less than easy information(sometimes) to get for comparing different products is their oil filter efficiency scale..... A nominal size say of 25 micron  ( a human hair is 40-80 for reference) may sound good , but not as good if you find out it only is filtering out one out of every two of these size particles ( beta 2 measure)  However if 98.7 percent of all 25 micron and above sized matter is filtered then you would be much happier ( Beta 75 measure). It would seem that the 98.7percentage figure is becoming the defacto norm, but  ...  watch out for sales pitch.

 

For Aussie readers our Ryco filters across the standard range is 25 or 30 micron if i recall correctly.... which is about par for the course. Dont know the syntech measure, because it wasn't recommended for race type environs.

 

For those thinking if 25 micron is good then 10 micron must be better, cleaner etc,,,,,, maybe,,,, but some of the oil additive packs have ingredients in them of around this size,,, so you might just be stripping the oil of some of its protective qualities. 

 

So again it seems a fairly standard  BMC OEM oil filter with a stock standard oil pump was a pretty good set up to start with.  **** I have no idea if it is still a good setup for turbo, weird wonderful setups, so please do your own research****

 

 

 back to The OPs question ,  the standard remote filter setup sold through minispares RFK9 and probably others    fits a longer bigger filter   cross check against Baldwin B178  or Mann  w719/15

[unburntfuelinthemorning]

The MSF166 Minispares oil filter doesn't have a bypass valve and nor does the Mann W 712 listed for Minis however the Mann W 719/15 does and it's opening pressure is rated at 2.5 bar or about 36 psi. 

 

The 712 is just under 3" long, the MSF166 just over and the 719/15 just under 5".

 

https://catalog.mann...SPORTERS/ROVER (MG%20ROVER%20GROUP%20LTD)/Mini%20(MK%20I%20%2B%20II)/1000%2099%20H%20(T00000000322131)/Ventilator/W%20712

 

https://catalog.mann...Filter/W 719~15

 

David Vizard states in th'ol book... "If the oil is cold and thick or the filter is starting to clog the least bit, the bypass valve opens and some of the oil bypasses the element.  Installing a large remote filter of the full-flow type, as shown here, ensures clean oil under all conditions."  The accompanying photo shows a filter roughly as long as an inertia starter motor attached to a remote filter head.

 

So the larger Mann filter mounted to a remote filter head bypasses at 36 psi which seems a bit better than 8psi from the standard filter head however Vizard is using an even larger filter which he says is full flow by which he must mean it has no bypass valve.

 

Fascinating.

Edited by unburntfuelinthemorning, 22 May 2019 - 01:53 PM.

[unburntfuelinthemorning]

 

Oops.

Edited by unburntfuelinthemorning, 22 May 2019 - 01:53 PM.

[DeadSquare]

Before crank bearings were pressure fed, no engines had filters, and it was a long time before all the engines with an oil pump had a filter.

 

I think that the last modern era engine not to have an oil filter was the early Renault 4.