Outer Limits 4x4 Board

dogbreath_48 wrote:I think the genuine 1hd-t filters are a bypass design, the ryco
replacment is a full flow type which obviously won't filter down the the same fineness of the genuine. Pretty dodgy.

From memory the price difference between the z161x and genuine was only 30% - not worth taking chances on a 6-7k engine IMO.

Not quite... full flow, filters better than bypass.

But filters also have a pressure release valve which may open a bit as filter blocks up. (also in block on some engines) Also a dirty filter 'filters' better than a new one.

People get anal with filters, just change oil regularly, use a known brand (they will have to stand up in court if something goes wrong so I would trust RYCO etc)

Bazzle

bazzle wrote: Not quite... full flow, filters better than bypass.

Sorry, but you are 100% incorrect on that. Full flow removes the rocks, bypass removes the smaller particles.

Full flow filters cannot be very efficient because they need a high flow. You will have a 50% removal at about 30-50 microns.

Bypass filters can get down to single digit micron levels.

That is why many trucks have combination full flow and bypass filter setups which look like this:


There are some rare cases - e.g. some toyota diesels - which have a full flow and a bypass filter in one unit.

Land Rover TD5 engines run a bypass centrifuge (instead of a bypass filter) as well as the main (full flow filter). Centrifuges are better again in terms of particle removal.

What about one of these? = http://fs2500.com/

I have been looking at giving on a go from watching the videos thay look the goods.

Red Dog 4x4 wrote:What about one of these? = http://fs2500.com/

I have been looking at giving on a go from watching the videos thay look the goods.

The problem with external bypass filters is severalfold.

a) You need to source the oil without reducing engine flow noticeably
b) You need to return the flow to the sump
c) You generally dont know other than guesswork when the filter needs changing.
d) It's debatable if cleaner oil at the sub micron level = longer engine life. Million miles is not uncommon for trucks anyway.
e) Yes, you can run your oil much longer, if it's synthetic and doesn't get contaminated with fuel / coolant etc over the next 50,000km.
f) Is there a cost benefit? Maybe for a long haul vehicle. General 4wd - maybe not.
g) Your engine will prob wear out for other reasons before oil kills it. There's a reason taxi's get 1M km from a falcon engine but most ppl only get 300,000.

So I love the idea (including toilet roll), but for me, it's cheaper to just do what Toyota says, and assume their engineers calculated the filter volume vs soot loading correctly and put in the right amount of material to do 10,000km.

So yes they are probably better. But, are they worth it.
A kevlar chassis would be "better" too.

ISUZUROVER wrote:

That is why many trucks have combination full flow and bypass filter setups which look like this:

I'll bite

What the second banjo fitting for?
Twin turbo?

Paul

me3@neuralfibre.com wrote:

ISUZUROVER wrote:I'll bite

What the second banjo fitting for?
Twin turbo?

Paul

Factory it's for injection pump lube. Turbo is on the other side and gets it's oil from the same block that top pipe bolts to.

Early Toyota 2H motors had a centrifugal oil filter, apparently work very well, but Toyota in all its wisdom canned them in '82 or so. As an aside, what are Nippon Max filters like, bloke on ebay is talking them up and hanging shit on fleetguard filters.

I believe Nippon Max are owned by Cooper Wesfil or vice versa. Personally I would stay away.