external oil return from head?

[ralphsdiorama]

Hey guys, I am in the process of doing an rb26 swap in a s14 and am doing some precautionary oil mods. I am putting in a 1.5mm oil restrictor and in addition to that I want to add an external oil return line from the welsh plug on the head to the sump. I haven't been able to fit my engine into the car yet and I was wondering how much room I have between the head and firewall in order to install a 90 degree bend for the external return line? (I have mckinney mounts) Thanks!

[STR8E180]

im just using a brass 90 degree bend on my rb26 and it fits fine my rb26 is in a R32 but im guessing the clearance should be very close to having it in a S14

[ralphsdiorama]

Thanks man. Has anybody done this in their s14?

[Darius]

http://www.spoolimports.com/co...t.asp

IMO, I would run the drain line to the intake side of the motor to avoid heat related issues with the hose. Ask CarlH about his lines way back in the day.

[cdorhout]

I run the spool imports drain that Darius just posted, but I ran mine with braided -6 instead on the intake side. I welded a -6 bung into the side of the oil pan for the return. I also have a S14 with McKinney mounts so I know for a fact that it fits.

[Carl H]

that was done before any of the fancy pants press in/bolt in fittings were available.

[Darius]

HAHA that is what I have on mine too, but I have yet to run the lines down to the oil pan. Lazy I know. I just don't want to mess with pulling the motor around until winter.

[sickness14]

do you guys think i should do this oil return mod to by RB head? The original owner of the car had a -12 an tapped into the welsh plug but i didnt do it on the replacement head i got. Is it really necessary, can it hurt if i do this and i dont really need it? like will there be too little oil in the head and cause things to happen?

[Cjmartz2k]

Not needed at all for your application. The aussie guys (mostly sydneykid and his groupies) push the hell out of the "oil stuck in the head" problem. Thing is, it's not a problem. It *can* be helpful to put the "drain" in the back of the head in high boost/high RPM/high hp applications because there is so much blow by going up thru the oil passages down from the head, it can blow the oil back up into the head. The additional "drain" is simply another place for the blow by gasses to go, it's not really a drain, and not needed in 99% of RB's.

They argue the s*** out of the mod to justify to themselves how much money the spent on a not needed mod.

[gawdzilla]

Not needed at all for your application. The aussie guys (mostly sydneykid and his groupies) push the hell out of the "oil stuck in the head" problem. Thing is, it's not a problem. It *can* be helpful to put the "drain" in the back of the head in high boost/high RPM/high hp applications because there is so much blow by going up thru the oil passages down from the head, it can blow the oil back up into the head. The additional "drain" is simply another place for the blow by gasses to go, it's not really a drain, and not needed in 99% of RB's.

They argue the s*** out of the mod to justify to themselves how much money the spent on a not needed mod.

not running one . arguably overhyped. however, i did notice a BIGGGG difference with blowby when i put the mines baffle plates in the valve covers, which does something similar to the drain but requires less work. sustained high rpms with hot oil will push a decent amount through the vents, but the mines baffles definitely put a stop to it.

[Shocker]

not running one . arguably overhyped. however, i did notice a BIGGGG difference with blowby when i put the mines baffle plates in the valve covers, which does something similar to the drain but requires less work. sustained high rpms with hot oil will push a decent amount through the vents, but the mines baffles definitely put a stop to it.

Agreed. I bought into the "oil drain" mod back in the day. However after aging, and learning more about this motor its simply not an "oil drain back". The giant holes in the back of the head are the oil drains, and they are large factory. This acts like Chris said as more of a pressure evac from the head than anything.

[ralphsdiorama]

If I am going for a mostly street car (track time every other month) with around 550whp at the most with an N1 oil pump (Boost @ 20psi). Should I just do a 1.5mm restrictor and mines baffle plates. I'm guessing using the drain as a pressure release would not be very beneficial unless I was running a lot more power and boost. Thanks

[eh?]

Not needed at all for your application. The aussie guys (mostly sydneykid and his groupies) push the hell out of the "oil stuck in the head" problem. Thing is, it's not a problem. It *can* be helpful to put the "drain" in the back of the head in high boost/high RPM/high hp applications because there is so much blow by going up thru the oil passages down from the head, it can blow the oil back up into the head. The additional "drain" is simply another place for the blow by gasses to go, it's not really a drain, and not needed in 99% of RB's.

They argue the s*** out of the mod to justify to themselves how much money the spent on a not needed mod.

+1

Even more so on the RB25 since you have 3 head drains. Not too mention the oil hungry hydrolifters.

Unless you have a oil pump that flows massive amounts of oil this mod is pointless..

[gawdzilla]

If I am going for a mostly street car (track time every other month) with around 550whp at the most with an N1 oil pump (Boost @ 20psi). Should I just do a 1.5mm restrictor and mines baffle plates. I'm guessing using the drain as a pressure release would not be very beneficial unless I was running a lot more power and boost. Thanks

i assume you're talking about drag track here? just top off with an extra 3/4 qt every time you go to the track and you should be good

[ralphsdiorama]

Drag, Auto-x, and some road race.

[cdorhout]

I'll go ahead and disagree with the masses. I've run without it, and I've run with it.When I orginally built the RB30 with no drain, i had MASSIVE amounts of oil in the catch can. After adding the drain, the catch doesn't fill up a 1/10th as fast. Whether it oil draining or pressure bleed off, it worked for me.I say run without it first. Add it if necessary.

[RustspecS13]

After drifting with my all stock RB20, I'm going to add some external drains or restrictors.

My first drift event I had lots of oil in my piping and it was starting to burn. it took about 50 miles of regular driving to burn it all off.

I don't know if every rb needs it but I know mine does, and if you have yours apart I'd recommend adding something while you have it apart.

~Alex

[Cjmartz2k]

I'm not saying it can't be useful, it's just not the "must have or your engine will blow up" mod some of the aussies make it out to be.