Oil Control In Rb's For Circuit Drag Or Drift

[abr33]

Hi all, i have a question, my 25, i built it, got it tuned (about 320rwkw), found out about oil problems, got scared and pulled engine out to fit restrictors and make sump bigger. To my horror the bearings were totally shot, and had been running dry at times obviously, anyway thats sorted, whole bottom is getting blueprinted as we speak. But what i want a second opinion on is, is putting a scavenge pump from rear of sump pan to front unnessisary? Iv made sump bigger, about 1.5L, and its baffled and gated, modified pickup, i have tomei pump set to 65psi. head restrictors, rear head drain etc. Reason i worry is when i do a hillclimb race of any sort, when pulling huge revs for really long times up really steep hills, will the oil flow back to front of sump? or is it a worthy setup? Its predominantly driven sensibly on the road, but i will do the odd race and track and skidpan day.

Now everyone will say go dry sump... Iv considered it, not going to do it the aircon is too valuable around here. plus its pretty dear. And i dont bash the limiter, so the tomei should serve me well. Iv probably missed some details... thanks

[jangles]

should be fine for a road car that gets a bashing every now and then, just make sure you have plenty of oil prior to any off street events!

[KiwiRS4T]

Did you drill out and relieve the drains in the head?

[abr33]

No i havent yet, but they look great? nothing restrictive about them. or do i need to take them oversize?

Now, plenty of oil?

Does anyone know if overfilling a bit is bad? what happens if your crank slaps the oil?

[zebra]

No i havent yet, but they look great? nothing restrictive about them. or do i need to take them oversize?

Now, plenty of oil?

Does anyone know if overfilling a bit is bad? what happens if your crank slaps the oil?

Compare the half a dozen tiny oil drains in the RB to the 12 x 14mm oil drains in a JZ

So yes they are restrictive, most guys drill them out by 1mm as there isnt much room to move.

[kitto]

So drilling out the drains in the head and block. How do people actually go about doing this?

Just grab the power drill, a 9mm drill bit, some cutting fluid and go nuts?

Do they get a workshop to do it.

Or use a suitable drill press?

[abr33]

You mean the back head drains in particular? ill tidy them with a die grinder.

So is crank hitting oil bad?

Any other opinions on the scavenge pump?

[jangles]

That's the ones, die grind them!

Peopl have been 1l overfilling sumps on track days for years

[abr33]

ok so no real problem with an overfill, ill attack the drains on weekend.

Has anyone experienced oil problems with restrictors and head drain with bubbles or starvation up really steep hills with big power?

[KiwiRS4T]

So drilling out the drains in the head and block. How do people actually go about doing this?

Just grab the power drill, a 9mm drill bit, some cutting fluid and go nuts?

Do they get a workshop to do it.

Or use a suitable drill press?

I was going to use a 10mm bit unless anyone knows better?

[jangles]

id use a die gringer, dremel etc..

[kitto]

id use a die gringer, dremel etc..

This is for the rear drains yes, but what do people do about the 8?mm holes in between the cylinders?

[KiwiRS4T]

As above run a 10mm bit through although it would be nice if someone could confirm having done it themselves.

[O2 Autosports]

I run 10mm, no probs at all.

[koe]

solid lifters,oem restrictors,oil cooler set up,N1 mod oil pump and this

Nice flow

[DVS JEZ]

Koe have u tried fitting that in the engine bay yet?

U may need to massage the firewall in to clear the fittings

[abr33]

When you guys say 10mm drill, where are you talking? i though the idea was to grind the rear drains? or are you using a drill in place of die grinder?

[jangles]

This is for the rear drains yes, but what do people do about the 8?mm holes in between the cylinders?

As above run a 10mm bit through although it would be nice if someone could confirm having done it themselves.

I run 10mm, no probs at all.

die grind rear drains, drill others as they are round

Edited December 6, 2011 by jangles

[kitto]

die grind rear drains, drill others as they are round

The question still remains though. do people just get out the power drill with some cutting lube and drill out the drains to 10mm in the head and block and then chamfer the holes with a deburing bit.

Or do they get a machinist with a drill press/cnc to do it?

[O2 Autosports]

I normally do it with a cordless drill.