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

    • Ok i will get those 310mm. I found one but on a different site. This is the description on those...is it ok? Technical parameters: - Axle: front. - Disc type: ventilated. - Number of holes: 5. - Disc diameter: 310mm. - Total height with center: 54mm. - Thickness (new/min.): 30/28mm. - Designed for brake calipers manufacturer: Sumitomo.
    • You Gregged a whole racetrack!?
    • Look for broken wire or bad connector at the motor. Might not be it, but is worth starting there, as it is easy.
    • Hi everyone, I’m having an issue with my R32 GT-R. Sometimes, when the car goes over a bump or experiences some vibration, the 4WD warning light comes on the dashboard. When I check the code from the control unit in the trunk, it shows Code 19 – ETS Motor. However, everything seems to be working fine — if I turn off the engine and restart the car, the light goes away and everything functions normally. Has anyone experienced this before? Where should I start troubleshooting this issue? Thanks in advance!
    • I'm back from the dyno - again! I went looking for someone who knew LS's and had a roller dyno, to see how it shaped up compared to everything else and confirm the powerband really is peaking where Mr Mamo says it should. TLDR: The dyno result I got this time definitely had the shape of how it feels on the road and finally 'makes sense'. Also we had a bit more time to play with timing on the dyno, it turns out the common practice in LS is to lower the timing around peak torque and restore it to max after. So given a car was on the dyno and mostly dialled in already, it was time for tweaking. Luis at APS is definitely knowledgable when it came to this and had overlays ready to go and was happy to share. If you map out your cylinder airmass you start seeing graphs that look a LOT like the engine's torque curve. The good thing also is if you map out your timing curve when you're avoiding knock... this curve very much looks like the inverse of the airmass curve. The result? Well it's another 10.7kw/14hp kw from where I drove it in at. Pretty much everywhere, too. As to how much this car actually makes in Hub Dyno numbers, American Dyno numbers, or Mainline dyno numbers, I say I don't know and it's gone up ~25kw since I started tinkering lol. It IS interesting how the shorter ratio gears I have aren't scaled right on this dyno - 6840RPM is 199KMH, not 175KMH. I have also seen other printouts here with cars with less mods at much higher "kmh" for their RPM due Commodores having 3.45's or longer (!) rear diff ratios maxing out 4th gear which is the 1:1 gear on the T56. Does this matter? No, not really. The real answer is go to the strip and see what it traps, but: I guess I should have gone last Sunday...
×
×
  • Create New...