Jump to content
SAU Community

Oil Restrictors --- Pics

Fastrotor

By Fastrotor,
in Engines & Forced Induction

 Share

Recommended Posts

Fastrotor Proficient

Fastrotor

Posted
Posted

Hi guys, just removed the head to fix a blown gasket, and i noticed three oil restrictors in the head.

I just wanted to clarify if these are standard ? I was under the impression from all the talk of fitting restrictors to limit oil buildup in the head meant there wasnt any at all to begin with ..

Was i assuming incorrectly , and you guys just modify them by fitting smaller orifice ones ?

Gary

IMG_1593.jpg

IMG_1594.jpg

Link to comment
https://www.sau.com.au/forums/topic/266059-oil-restrictors-pics/
Share on other sites
gotRICE? Veteran

gotRICE?

Posted
Posted
Hi Gary

they are the standard nissan restrictors,

tap them down into the block and then install the new ones on top of them.

? Really?

I have no idea how to do the restriction mod, but it sounds wierd! Do you really just tap them into the block and have them float around? ahah

gotRICE? Veteran

gotRICE?

Posted
Posted
dont think they will go into the block as the hole goes a fair way down just pushes them in a little bit so you can install the new ones it wont float around

Never thought of that. Makes perfect sence!

Ah ok, thanks for the clarification Darren. Im not going to put any in , but i have the rear oil drain back to sump on its way up here. I just wanted to check if they were std.

Gary

Is this an engine out job? Do you think you could fire up some pics when its in?

I do a bit of track work in my R33, and havnt done either mods yet... bandad it with overfilling the oil slightly. And dont go quite as hard.

But it still makes me nervous!

Fastrotor Proficient

Fastrotor

Posted
  • Author
Posted

Yeah i track my car also, just on a small circuit up here. Haha first round is next saturday !, wonder if i'll make it .... :P

This is just a head off operation.... You do need head off (or motor out) to fit the rear oil drain. Im getting it off Tufrx3 on here.... nice bit of gear.

I don't rev mine past 7000, but it still concerns me abit. But hasn't died in two years of racing it ....

I'll do pics when done..... Check the "automatic performance thread" for pics and updates.

Gary

Fastrotor Proficient

Fastrotor

Posted
  • Author
Posted

Oh well, so be it. It hasn't blown up in 16 years street and two years + racing, i just see the rear drain as an additional help. And honestly i really just dont like the idea of limiting the amount of oil the factory deemed necessary. Just my personal preference. And i dont rev it over 7000 , which i assume makes a difference ?

Gary

SLAPS Rising Star

SLAPS

Posted
Posted (edited)
thats what i was thinking,

plus they cost next to nothing from a machinest

Don't even need a machinist.

6mm black rod from the local metal supplies on O'sullivans beach road + a drill press with a 1.5 or 1.2mm drill bit and you have a restrictor. :thumbsup:

---

Gary,

Sorting the Nissan oil issues begins with the oil restrictors. Second... I personally prefer venting the sump rather than the mess of drilling/tapping the head for an additional oil drain especially if its being raced.

---

Fastrotor... My issues with excessive oil occurred over 5000rpm and 95psi oil pressure with 2 x 1.8mm oil restrictors.

It really depends on the oil pressure and setup you have if your going to experience problems or not.

I now run a single 1.5mm up front front and blocked rear with stupid hydraulic lifters. Zero issues.

Edited by TheRogue
Fastrotor Proficient

Fastrotor

Posted
  • Author
Posted

Thanks for the tips. I can whip up a restrictor myself no probs.

The oil drain im using is a shrink fit into welch plug hole.

So you guys are that concerned for my motor, totally stock top end, 7K factory limit...... you really want me to go restrictors , ie its that close to a problem ??

I have hydralics still and VCT ..... so there is only the 3 restrictors to do ?? I assume i'll leave the vct one as is, and reduce the other two. ?

What size are std , 1.8mm rogue ?

bubba Grand Master

bubba

Posted
Posted
Didnt anyone here try and search for this already and find SK's guide on oil control? That thread has everything you need.

search "Oil Control In Rb's For Circuit Drag Or Drift" - SydneyKid

+1

Size and location of restrictors is dependant on head and oil pump used aswell as intended application.

femno Grand Master

femno

Posted
Posted

Youre all forgetting its a standard engine? Why would you need restrictors with a standard oil pump? You dont have any extra flow or pressure...nor will the standard pump empty the sump as quickly as an aftermarket pump would so why limit supply to the head?

Fastrotor Proficient

Fastrotor

Posted
  • Author
Posted

I hadn't read the thread yet as i only posted this to show what i saw and ask if it was stock or not. I initially had no plans to add the restrictors.

Upon reading SK's threads first few pages and from alot of suggestions to do it from you guys, i'm going to block off the center feed only. Im not going to restrict the rear one, as i figure halving the supply is enough in combo with the rear head drain i have coming. Coupled with the std pump, and std rev limit. I feel this is a reasonable compromise.

I have some copper welding tips here close to 6mm i can sand down to fit (using a drill to keep round) , then solder up the center hole. Easy.

Gary

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      Nah, the car seems to run exactly as it did prior, in saying this it does "seem" to be better down low, like more eager to rev, but that may be 100% placebo effect from intake noise But, I'm not worried about it at all, in the end it is a fairly low compression NA engine that has a well shrouded intake,  if it is getting hotter IAT I cannot notice anything negative performance wise from the seat of my pants thrashing it about on the street or sitting in traffic, so meh, car now now makes induction noise so I'm happy
    • Kinkstaah
      MLR's Bogan cruise ship

      By Kinkstaah · Posted

      Do you have an IAT sensor? It's worth checking it to see. You may be suprised how little gap you actually need to flood your engine with hot air. (I tape up my airbox for a reason) :p
    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      @KinkstaahKrinkle paint the "silver" alloy, not the red filter frame Engine bay heat won't be a issue worth worrying about as the silver alloy blocks it off on 3 sides, as for the top, the bonnet seals most of it and the big OEM CAI intake snorkel is still fitted in its original position  I will head into Clark's Rubber when I have some time to grab some pinch weld to tidy up the alloy after I paint it As for performance, I honestly wasn't expecting any, the only reason I got it is because the intake noise sounds cool to my old ears when I'm feeding it the beans Sometimes it's the silly things you do in in life that gives the most fun, and I do love anything that makes cool car noises In other news: I survived 4 nights at sea with Jackie not throwing me over board, holidays are continuing now as we are currently chilling at the Beachcomber in Toukley, after taking the coast roads from Sydney in the MX5, top down all the way, Toukley is where I spent a good deal of my youth holidaying during the summer months, there's lots of reminiscing going on,  and lots of beaches and old houses to visit Next on the list is to head to Batemans Bay for a few days, but we will take the Commodore out to stretch its legs, then Commodore hasn't really moved for months
    • r32-25t
      PRP RB26 cast block + head prototype running

      By r32-25t · Posted

      There’s probably people who’d like to do it and then when it comes to putting their hands in their pockets they’ll all disappear into the shadows 
    • Duncan
      Thinking of getting a Q50 300hp and just tuning it instead of getting the Q50 Red or 400R

      By Duncan · Posted

      interesting....sounds like the later trans has software differences (or AM vs JDM). If I wasn't going down the tuning route it would be worth looking into retrofitting a new computer to the old box.
×
×
  • Create New...