Banjo Bolt Specs

[ENGINR]

Hey guys,

I was supposed to bring the banjo bolt for the oil feed from the cylinder head home with me from when I was working on the engine on Tuesday and FORGOT (I'm getting old and my memory is not so good!!)

I need to get some speedflow fittings so that I can make up the new oil feed line before going back up there and I was looking to get a -4AN outlet to screw into the cylinder head to run the -4AN line to the turbo.

Can anybody please help me with the specs for the banjo bolt (size and thread) which goes in the oil feed outlet on the cylinder head so I can get the right fitting first time!

Cheers,
Shayne

 

[Gianni]

I posted a few weeks ago looking for that thred size and thread size of the water return pipe. No luck. It's either an m10 or m12x1.25 for oil. Water I'm not so sure about. It's larger.

 

[DOUGMO]

Ill check tomorrow shayne.

 

[EVO-00X]

The banjo fitting Eyebolt in the side of the head for the turbo feed = Part number MF650102.
M10 x 20mm long with 1.25mm thread pitch

 

[Gianni]

Yeah and the water return line is m16 yeah?

 

[ENGINR]

The banjo fitting Eyebolt in the side of the head for the turbo feed = Part number MF650102.
M10 x 20mm long with 1.25mm thread pitch

Thanks Rob! I was thinking it was either a M10 or M8 x1.25, but having it confirmed is great. I was going to replace the banjo fitting with a speedflow screw in outlet and then put a 90deg hose end fitting on that.

 

[EVO-00X]

Just be a bit wary Shayne. The purpose of using a banjo fitting on the side of the head would have to do with maintaining a specific amount of oil flow and pressure to the turbo.
If you change it to a straight through -AN system, the amount of oil and pressure might change dramatically.
Ive never tested a straight through line with a pressure gauges or anything, but the banjo bolt serves a purpose for a reason, much like it does for your brake calipers.

 

[4piknup]

the banjo bolt serves a purpose for a reason, much like it does for your brake calipers.

Ok Rob, I will bite, why is there a banjo bolt on some brakes and not others?
I look around and I have banjos on wrx, proton and i20. Screw type on evo3, tr magna.
The only reason I can see is thet a banjo is easier to undo, because you don't have to twist the line.
Surely you wouldn't want a flow restriction or pressure drop at the caliper bolt? To me that would be like a 4" exhaust with a potato in the end

 

[khubner1]

shayne i'm using a similar setup to you with my braided lines and make sure you get a restrict or fitting because if you don't you could risk blowing the seals in the turbo

 

[ENGINR]

I'll definitely be fitting the oil restrictor to the feed line to avoid blowing the turbo seals. As long as that's there I am confident that the oil flow and pressure will be OK.

Was it this forum that I thought I saw the PN for the oil restrictor fitting listed?

 

[4piknup]

Isn't the oil restrictor that is the common eBay type for roller bearing turbos, and plain bearing turbos require more oil than that, I don't doubt that you require some sort of restriction, but you need to find out how much oil is too much

 

[EVO-00X]

Ouch that hurt, I'll muzzle your bite Jack... am I going to get an infection? :lol:
Banjo's are a strong and versatile fitting good for 90' bends and turning the hose in a 360 degree environment, but there's no denying that they physically also serve as a restrictor/pressure regulator to some degree - just look at the size of the hole in the side of the bolt compared to a straight through hose fitting. Banjo connections are mainly used in high pressure situations and when you swap out the banjo for a straight through line it will effect your fluid supply and pressure no doubt about it. But to what extent at the oil feed or brakes I havent physically measured but its worth taking into consideration as manufacturers just dont fit them for no reason. As Shayne has since said that he's adding an inline oil restrictor to the -an line then that's all that matters
If some brake calipers use banjos and others dont it would probably have to do with ease of installation for one, but different brake caliper designs and sizes would also require different hydraulic pressures for expelling the brake piston out. Im agine removing the banjo if it serves as a restrictor. It will change the pressure and have an impact to some extent on brake pedal feel and how much speed and force the fluid pushes the piston out. Think of it this way... if pressure and amount of fluid wasnt a factor in a brake upgrade, then why is it when people change from OEM brakes to EVO/Brembos brakes, they also change to the larger brake booster?
All Im saying is that the difference in pressures might be a little or it might be a lot, or perhaps even in some circumstances it might be negligable... but you have to ask yourself these sorts of questions before changing fittings on key components otherwise you can blow seals, cause adverse pressure to bearings, in a hydraulic situations it could push pistons out too quickly or with too much force etc.
Shayne, I had a thread on oil pressure in the GSR/EVO section... there were pics and info in that for restrictors and other oil related mods.

 

[4piknup]

As usual rob, a very inciteful reply, I am not convinced but i shall consider your points over a rum or two, and it will be a discussion point with the mrs. Lol.
Yes obviously a banjo is a restriction compared to a screw fitting, but I will need to think about why a restriction is required for some calipers and not others.
On upgrading boosters, if you upgrade the master cylinder to a larger diameter, you will increase the pedal effort required to press the pedal. A matching larger diameter booster will negate the effects of changing the master.

And sorry for hijacking

 

[ENGINR]

Ouch that hurt, I'll muzzle your bite Jack... am I going to get an infection? :lol:
Banjo's are a strong and versatile fitting good for 90' bends and turning the hose in a 360 degree environment, but there's no denying that they physically also serve as a restrictor/pressure regulator to some degree - just look at the size of the hole in the side of the bolt compared to a straight through hose fitting. Banjo connections are mainly used in high pressure situations and when you swap out the banjo for a straight through line it will effect your fluid supply and pressure no doubt about it. But to what extent at the oil feed or brakes I havent physically measured but its worth taking into consideration as manufacturers just dont fit them for no reason. As Shayne has since said that he's adding an inline oil restrictor to the -an line then that's all that matters
If some brake calipers use banjos and others dont it would probably have to do with ease of installation for one, but different brake caliper designs and sizes would also require different hydraulic pressures for expelling the brake piston out. Im agine removing the banjo if it serves as a restrictor. It will change the pressure and have an impact to some extent on brake pedal feel and how much speed and force the fluid pushes the piston out. Think of it this way... if pressure and amount of fluid wasnt a factor in a brake upgrade, then why is it when people change from OEM brakes to EVO/Brembos brakes, they also change to the larger brake booster?
All Im saying is that the difference in pressures might be a little or it might be a lot, or perhaps even in some circumstances it might be negligable... but you have to ask yourself these sorts of questions before changing fittings on key components otherwise you can blow seals, cause adverse pressure to bearings, in a hydraulic situations it could push pistons out too quickly or with too much force etc.
Shayne, I had a thread on oil pressure in the GSR/EVO section... there were pics and info in that for restrictors and other oil related mods.

Thanks Rob - appreciate your input.