Jump to content
SAU Community

Rb20de Compression

Rancher

By Rancher,
in Engines & Forced Induction

 Share

Recommended Posts

Rancher Community Regular

Rancher

Posted
Posted

Hi again!

After skimming the Turbo performance part of the page I came across a Compression problem someone was having. Not too long ago I checked mine (After I over heated the bastard) and the compression was about 120 130 in all 6 cylinders. Normal.

But when I was reading the that page his was also 120 130 in all 6 cylinders (Forgies, bigger turo and a 2ml head gasket). This got me thinking "Wtf?" My question is; What is the standard compression in an RB20DE? or have I somehow (When I rebuilt the top end and new head gasket) jumped down to turbo compression? Its a standard Nissan Head gasket (From Nissan).

If I have, would this cause problems with my car? I didn't think it would but its really got me thinking.

Link to comment
https://www.sau.com.au/forums/topic/153409-rb20de-compression/
Share on other sites
blackprincegts Collaborator

blackprincegts

Posted
Posted

not 100% sure dude but i think there pretty low numbers..If i remember correctly i think my rb20de was like between 157 and 165 on all 6.

i doubt that changing your head gasket to another stock nissan 1 would change your compression that much. i remember working it out that adding 0.5mm to your head gasket only lower it by like 0.3 ova point or sumtn...

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

    • niZmO_Man
      R32 Nostalgia

      By niZmO_Man 路 Posted

      From my youth: GTi-R clutch change is a massive pain. The gearboxes are fragile? But the car is super cool and I want one 馃槩 
    • niZmO_Man
      New R32 owner soon

      By niZmO_Man 路 Posted

      Remember this is 1988 tech.
    • TurboTapin
      R32 GTST - 600KW+ RB28/CD009 Build

      By TurboTapin 路 Posted

      Driveline vibration is resolved. I ended up loosening all my engine mount and trans mount bolts, giving it a good shake then retightening everything and it's gone... Let's just say I was surprised that fixed it.  I've been happily driving it around again but unfortunately put zero time into my direct port/constant pressure WMI setup. I'm on vacation next week, so I'll try and finalize it then.  On a different note, I spent all week fuel/ignition mapping 2x 216L V16 engines. Turbo's were burning glycol and we swapped them out for larger units. We also had planned emissions testing on site, so I figured I'd be there the same week to use their instrumentation and massage any emissions issues out if needed. This was a first for me. Fuel management is similar in certain ways to automotive (i.e air density as load variable) but very different in others. It's all PLC based and AFR's are controlled by air and not fuel. They use a control valve between the turbo and air manifold to control pressure which in turn controls AFR's. Due to this, target AFR tables supplied by the OEM are in pressures and not mass which really through me off. They use air pressure vs fuel pressure tables. I also relied on an O2 concentration sensor the emissions team had in the exhaust. Ignition timing was also all over the place and we were losing a fair bit of power. They're now happily sitting at 16-40BTDC depending on load. We were making about 1600kw at 900rpm at 90% load. Engines were running a lot smoother as well.    
    • Duncan
      1992 R32 GT-R Race Car

      By Duncan 路 Posted

      heh, aint no R32 ever meeting modern targa cage rules unless the driver is veeeery short OP, good luck with the sale, since its already in the land of freedom I'm sure you will find a good buyer.
    • Duncan
      Oil pan for RB25DET NEO Stagea "version"

      By Duncan 路 Posted

      meh, it was a good video, clear about the issue and how he dealt with it. A bit heavy on the RTV and very brave to put an RB in anything without rebuilding it first, but otherwise I thought it was good Dose, I'm not sure that having the pickup forward is a big issue; yes of course the oil could shift under brakes but the sump should never be empty enough for that to be a problem (unless you also have a higher volume oil pump, and that oil can't return from the head to the sump quickly enough)
脳
脳
  • Create New...