Full flow Oil filter relocation line thickness

**takai** · 01-01-2006, 04:03 PM

Ok im finally getting around to installing my oil filter relocator which i have and was thinking about line thicknesses. I was either going to use 1/2" (12.6mm) or 5/8" (15.8mm) lines, but i cant decide which. Its a full flow system so it will go:

Engine -> Oil Filter -> Oil Cooler -> Engine

The engine is a fairly heavily worked 4AG, although the workedness of it shouldnt make any difference. Would run about 60-70psi oil pressure at a rough guess. And will be running with an extended sump.
Anyone have advice on which size line to use? Or more useful what size lines is everyone using?

**Rallystanza** · 01-01-2006, 04:32 PM

Sounds as though your setup is quite similar to what mine will be.

I will have a larger capacity sump, oil filter adaptor block - oil filter relocator block - oil cooler - back to block.

Same full flow system as you with a 19 row oil cooler.

I also have to provide oil out to a turbo this needing more oil pumped out of the engine.

With having to pump oil out through a cooler and a turbo in adition to the filter on its own, will this affect the size of oi line I would have to go for?

I would think that a smaller line should be used to minimise oil pressure drop accross the system.

A new oil pump is being used also.

Sorry for the semi hijack but i guess its some more food for thought also.

So anyone have ideas on line size?

Good luck mate,

Jez

**dave368** · 02-01-2006, 10:08 AM

Originally Posted by takai

Ok im finally getting around to installing my oil filter relocator which i have and was thinking about line thicknesses. I was either going to use 1/2" (12.6mm) or 5/8" (15.8mm) lines, but i cant decide which. Its a full flow system so it will go:

Engine -> Oil Filter -> Oil Cooler -> Engine

Anyone have advice on which size line to use? Or more useful what size lines is everyone using?

Personally I use -10 lines on the pressure side (9/16" ID I believe) and now that we are breaking the bank and dry sumping, we are using -12 (5/8" ID) on the scavenge return and pickup sides but these are travelling to/from the boot.

One thing to make sure of is that your oil cooler is completely clean when using that configuration. Even if you bought it new, clean it out in both directions before using it as this is the last thing before the motor and anything that is in there is going through your bearings!

I've been told that you should use the filter in the way you have to dampen any pressure variances from the oil pump output so you don't split to the oil cooler (very very rare!)

Hope this helps a bit.

Cheers,
Dave

**takai** · 02-01-2006, 10:26 AM

Hm, i always thought that -10 lines were 5/8" and that -12 was 3/4" because the "dash" system indicates the numerator and the denominator is always 16. So -10 is 10/16ths or 5/8ths, and ditto for -12. I could be wrong though.

So it looks like -10 lines will be the way to go for this type of setup, i was always somewhat inclined to go with larger lines, because at least there wouldnt be a restriction that way.

The other thing is that i was advised to put the filter before the cooler to ensure that nothing untoward got clogged up in the cooler and therefore destroying all semblance of flow. Either way it will be all 110% cleaned before it goes in. Dont want that engine destroying itself at 9000rpm.

**BeRad** · 02-01-2006, 11:14 AM

ive used -10 all round on the oil system is working fine

**Hydra** · 02-01-2006, 11:46 AM

Wouldn't it be pointless going for a larger ID than the smallest ID in the system? Just say the oil cooler pipes were 1/4" ID and the filter adaptor had 1/2" ID fittings... wouldn't you just go for 1/4" ID hose? I could be well wrong of course, i've yet to play with the idea of remote filters and oil coolers.

**BeRad** · 02-01-2006, 11:52 AM

my oil cooler firttings are 1/2 well close enough to it to warrant -10 lines

**myne** · 02-01-2006, 12:06 PM

Odd that you're only expecting 70psi. My gze tops 80 on fresh oil and afik it's totally stock internally. is your oil system modded at all?

**dave368** · 02-01-2006, 02:23 PM

Originally Posted by takai

Hm, i always thought that -10 lines were 5/8" and that -12 was 3/4" because the "dash" system indicates the numerator and the denominator is always 16. So -10 is 10/16ths or 5/8ths, and ditto for -12. I could be wrong though.

Yep your right about the denominator being 16 but it is for the OD of the hose for SAE standard hoses anyway (according to http://hydraulics.goodyear.com/hydra...se_length.pdf). When you allow for the thickness of the hose, you end up with about 1/2" ID. I had to double check my fittings to make sure but -10 is definitely 1/2".

Originally Posted by takai

Either way it will be all 110% cleaned before it goes in. Dont want that engine destroying itself at 9000rpm.

Amen to that!

**BeRad** · 02-01-2006, 04:56 PM

80psi, hope mines not supost to be that high haha, my 3sgte runs around 55psi at flat stick

**off-road** · 02-01-2006, 05:14 PM

With a race engine aim is for 10 psi per 1000 rpm

**takai** · 02-01-2006, 06:21 PM

Yeah, the 70psi is a bit low for a race engine, however im taking into account the fact that its not a new oil pump (new engine will have one), and might be a bit tired. Last time it was running it was hitting 82psi at 8700rpm, so its not that bad at all.

Dave: interesting about the measurements, looks like i didnt screw up the first time then. I think the Speedflow braided stuff is actually measured on ID, because i got some -6 Speedflow hose and it was far larger than the 6mm which i assumed it would be. Quite confusing, now i just by my speedflow hose by the ID of the tubing, rather than the "dash" configuration.

Anyway, so 9/16" or 1/2" hoses should be fine for the sort of system im looking at? Or should i go for 5/8" lines?