oil filters - long vs. short

[jimbob-mcgrew]

changing the oil for a friend of mine, and there is both long and short filters available for it, both have the same attachment dimensions, and both the same brand.

the longer filter i would prefer to fit, as it will have more material inside, so would in theory work better, for longer.
the thing i want to know is, would it put any extra strain on the oil pump, or near by seals ? or are they no different, and only use shorter filters for limited bay space ?

92mm vs 119mm

cheers

[millworm]

Was told shorter ones boost oil pressure on worn engines

[mowgli]

Was told shorter ones boost oil pressure on worn engines

how?

[Stuart]

I guess on an empty crank it will help rescue pressure lag, but after that one occasion it won't be an issue ever again lol

[Andy]

I guess on an empty crank it will help rescue pressure lag, but after that one occasion it won't be an issue ever again lol
lmao lol lol lol

[mowgli]

i ought to go & find that old thread i started on bullsh!t people had ever been told.....lol

edit here it is........ clicky (http://www.pngclub.com/forum/showthread.php?141311-mowgli-s-pub-car-facts-bullsh!t-thread)

[millworm]

That's what I was told anyway, the theory behind it makes sense but you couldn't really shave enough of to make a difference without blanking it completely witch defeats the idea

[jimbob-mcgrew]

i think most pumps have a built in regulator for the pressure, although not 100% sure

[millworm]

i think most pumps have a built in regulator for the pressure, although not 100% sure

yeah a spring and ball bearing, would only stop it going over tho

[jimbob-mcgrew]

i suppose if the pump was shagged, and outputting low enough pressure, to the point that the relief valve wasnt cutting in, then a smaller filter would probably help it along a bit better than a larger one.

its kind of like wrapping a wound with bandage, when it needs stitching. lol

[jimbob-mcgrew]

i think ill stick with the smaller one, to be on the safe side, as the cars done alot of miles

[Stuart]

Once its primed it could take 100ml or 100litres, the pressure and flow wouldn't matter

[mowgli]

That's what I was told anyway, the theory behind it makes sense but you couldn't really shave enough of to make a difference without blanking it completely witch defeats the idea

there is no theory.. a pattern filter, be it 92mm or 119mm will have the same innards, unless it is a specialised hi-spec item, which, on this occasion, it most likely isn't.


use the small one, because it will be cheaper.


the valve in the oil filter is a bypass, so if the oil is cold, and thus thicker, it will not restrict the engine's oil flow by pushing it all through the actual filter, causing potential starvation.

[meritlover]

That's what I was told anyway...

...by someone who doesnt understand the oil pressure circuit.

Size doesnt matter but make sure the threads are the same. Very early engines had imperial oil filter threads.