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

    • He obviously had his reason for flipping you off. I wonder what it was...
    • Thats why I stay far, far away from Eastwood. only go there if I wanna eat Korean food 
    • I have to agree like, yesterday, I was driving down the warringah freeway towards the bridge when this jackass driving a beaten up Honda civic cut me off so suddenly it made me almost yank the wheel to avoid him hitting my car. Honestly and he had the NERVE to flip me off (or some other gesture Idk). Im a calm guy, but really some people just dont deserve to have a license, let alone be allowed to drive on densely populated roads/highways. If youre gonna cut through lanes at least use the damn turn signal
    • HPA do an interesting video on tuning, and Adrian shows on the dyno, moving from 10:1 to 12:1 (And I think even 13:1) and the power moves SFA. However, a couple of degrees of timing has a HUGE impact. Exhaust side of things will more be the length of the exhaust and how many bends and turns you have. The straighter you can keep it, the better. By a lot. Oh, and getting the diameter right. Bigger isn't always better. Going to big can actually lose you power.
    • I have to say, most people I see on the road fit the bill of atrocious drivers. Whether they be cowboys in their dual cabs, bogans in the Commodores, or the soccer mums. Pretty much most people on the road put zero freaking thought into driving. Barely look further up the road then the end of their bonnet, and have never even thought about how catastrophically wrong shit can go, by doing what they all deem as normal driving. Especially their late braking, racing to stopped lights, and sitting half a foot off the bumper of the car in front at 110km/h. Wanna know what's even better? By the time their kids get to be old enough to learn to drive, they've already got in the back of their brain what is normal driving, how annoyed you're allowed to get at people etc, and then their parents who actually have zero freaking skill at driving (Even though they constantly say "I've been driving for 20 years and never had an accident!") teach the little twerps how to drive, or should I say, how to make a car move. Literally watched a parent teach their L Plater, on a 4 lane freeway, that you just slam the brakes on, and push your way over, even with a B Double bearing down on you, and that's how you should drive, rather then, just keep going to the next exit. Same shit happens all the time for side streets etc, watching numpties pull dumb shit turns pushing across 3 lanes of traffic, rather than just go up the road another 30 seconds, and take the next turn that'll get you to the same location... Oh, and the damn right lane bandits. Or the retards driving along with their headphones in, and can't hear the ambulance or fire truck right up their ass about to run them over...   Pretty much, people drive on the road, like ego centric f**ks, and don't actually think how dumb shit their driving is, how it could easily kill them or someone else in a split second, or at the very least, how they're driving is contributing to all the shit they're bitching about on the road, like shitty congestion!
×
×
  • Create New...