Jump to content
SAU Community

Recommended Posts

Hey, I've picked up a second hand dry sump kit for a Gtr but wanted the opinion of some guys who already have dry sumps installed.

The seller told me ue was running a vacuum regulator off one of the valve cover breathers. It is a 4 stage peterson pump running all three pick ups to the sump and a head drain to the pan. He said if you dont have a regualtor it will pull too much vacuum and the pistons wont get any oil (rb30, no squirters) This seems odd to me and you wouldnt think it would matter.

So, is anyone running vacuum regulators? How much vacuum do you run? If you dont then what did you do with the valve cover breathers?

Link to comment
https://www.sau.com.au/forums/topic/355747-dry-sump-question/
Share on other sites

I have seen the cam cover breathers just blocked off. It would make sense to run a regulator so you can set it to what you want.

BMYHOE are you using the Moroso dry sump tank and breather unit as well? It looks pretty compact.

if you are scavaging from the covers it's probably not a bad idea to regulate the vacuum. they can suck pretty hard. hopefully a few others running dry sump RBs will chime in with their experience. but with it all set-up correctly blow-by will be practically zero.

4 stage pump wont pull enough vacuum to create any dramas with wrist pin lubrication. I would be suprised if you pulled more then 10in/Hg with a totally sealed motor. Typically need atleast 15+ to have any small end lubrication issues. Which usually requires 5, 6 stage or higher pumps to pull that amount.

Weve run ours with and without a regulator and its made no difference.

Best way to check how much is to hook up a vacuum gauge whilst on the dyno and read what it pulls.

if you are scavaging from the covers it's probably not a bad idea to regulate the vacuum. they can suck pretty hard. hopefully a few others running dry sump RBs will chime in with their experience. but with it all set-up correctly blow-by will be practically zero.

so with no blowby does this mean a catch can is not needed? - i would still like to run the catch can cause i got everything to plumb it up. but if it will make more vaccum i obviously wont run it..

r33 racer has given the answer. it's as simple as hooking up a vacuum gauge on the dyno and see what it's pulling from the head. and he's given some figures to go by.

and yeah no need for catch tank. the oil system is working properly and scavenging oil and vapour from the crankcase which comes out the 'breather' with the oil returning to the system.

You still run a breather can from your oil tank otherwise you may have some oil vapour spitting out of the breather line. If you do overfill the oil tank and system you will definitely get some oil spitting out that breather until it finds an equilibrium.

the whole point of a dry sump is to eliminate oil surge issues. so if plumbed up normally its a set and forget affair.

the only extra thing i would install is an electric gear pump plumbed into the oil feed so it cuts in if the belt breaks or for pre-oiling before start up.

You can run an accumulator if you want. It shouldnt be needed, but it does work well for pre oiling and incase something does go wrong you have some limited back up.

In terms of sealing the motor up, its just a matter of making sure any holes are bunged off and everything is siliconed up well with a good sealant.

The only other trick I would recommend is to get two machined discs to go either side of the pump pulley so the belt cant slip off. Also ensure there is something similiar on the crank drive side too. We lost a motor due to the belt coming off at the track when I ran off and some small twigs and stones got up and decided to lodge themselves between the pulley and belt.

The only other trick I would recommend is to get two machined discs to go either side of the pump pulley so the belt cant slip off. Also ensure there is something similiar on the crank drive side too. We lost a motor due to the belt coming off at the track when I ran off and some small twigs and stones got up and decided to lodge themselves between the pulley and belt.

Do you ever use an "auto-shut down" or a limp mode when you get no oil pressure?

We have a limp home setup with the autronic if oil pressure isnt within certain parameters it will limit revs to idle only but no shut down. A shut down would be better as it might even save the motor if those conditions come about.

  • 2 months later...

at the moment i'm talking to dailey engineering about building dry sump pan system for rb30 RWD with the pump attached so there's only 3 lines coming off it scavange to tank pressure to pump and pressure to engine and the pan is billet have a look at the vq35 pans also had a chat to ati about building a balancer with a 60 minus 2 crank trigger in it too

http://www.daileyengineering.com/vq_35.htm

and the regulators you were talking about i believe the race v8's run as much vacuum as possible for more HP

http://www.petersonfluidsys.com/engine_breath.html

on my mate's 25/30 we run a 3 stage peterson pump and plumb the cam covers back to the tank with no restriction

in 3 years only problem we had was when the turbo died and we had no screens on the scavenge and the pump ate the ball bearings destroying the rotors $160 later and all fixed

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


  • Similar Content

  • Latest Posts

    • Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
    • -10 is plenty for running to an oil cooler. When you look at oil feeds, like power steering feeds, they're much smaller, and then just a larger hose size to move volume in less pressure. No need for -12. Even on the race cars, like Duncans, and endurance cars, most of them are all running -10 and everything works perfectly fine, temps are under control, and there's no restrictions.
    • Update: O2 sensor in my downpipe turned out to be faulty when I plugged in to the Haltech software. Was getting a "open circuit" warning. Tons of carbon buildup on it, probably from when I was running rich for a while before getting it corrected. Replaced with new unit and test drove again. The shuffle still happens, albeit far less now. I am not able to replicate it as reliably and it no longer happens at the same RPM levels as before. The only time I was able to hear it was in 5th going uphill and another time in 5th where there was no noticeable incline but applying more throttle first sped it up and then cleared it. Then once in 4th when I slightly lifted the throttle going over a bump but cleared right after. My understanding is that with the O2 sensor out, the ECU relies entirely on the MAP tune and isn't able to make its small adjustments based on the sensors reading. All in all, a big improvement, though not the silver bullet. Will try validating the actuators are set up correctly, and potentially setting up shop time to tune the boost controller on closed loop rather than the open loop it is set to now. Think if it's set up on closed loop to take the O2 reading, that should deal with these last bits. Will try to update again as I go. 
    • More so GReddy oil relocation kits, sandwich plates, etc. all use 10AN fittings. And same, I've only used 10AN and my car sees track work (circuit, doing laps, not 10 sec squirt business).
×
×
  • Create New...