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

    • GTSBoy
      RB26DETT Sketchy boost mod?

      By GTSBoy · Posted

      There's restrictor pills in the stock boost control hoses. That's how they set the amount that was bled off and hence the "high" boost setting. The usual mod in the day was to remove it and send the "high" boost setting up to about 14 psi.
    • ARB26
      RB26DETT Sketchy boost mod?

      By ARB26 · Posted

      Thanks Duncan, that's the best info I've read. Furthermore after learning about the PCM programming side controlling the factory boost solenoid, the purpose of the solenoid is to "bleed" boost when pin 25 is earthed, thus allowing spring pressure in the wastegate actuator to overcome diaphragm boost pressure, thus closing or reducing the position of the wastegate flap creating more boost as the turbo is able to spin faster. It's pretty cool to see a designated Pill to do exactly this, would have liked to have seen it with a tiny filter over the end for those moments in vacuum.  The constant bleed pill has now been removed completely from the system and solenoid boost control has been restored once again.   Case closed 😂
    • GTSBoy
      Cas issue

      By GTSBoy · Posted

      The wideband reading is meaningless if it's not running. Why are you using shitty old sidefeeds on any engine, let alone a Neo? What manifold and fuel rail are you using to achieve that? Beyond that, can't help you with AEM stuff as I've never been their ECU/CAS combo.
    • Duncan
      RB26DETT Sketchy boost mod?

      By Duncan · Posted

      Manual boost controllers (where a little of the boost was bled off) were quite common back in the day, because they were cheap and easy. Generally they had a manual adjustment screw rather than being fixed like yours. Down side is they always bleed boost, not just when you want them to so an electronic boost controller that uses a solenoid will have less lag.
    • nash47
      Cas issue

      By nash47 · Posted

      Hello , im new here and i have A31 home build  RB25det neo stock eng / turbo  aem ems 2 blue connector  aem 3.5 map aem cas disk aem wideband connected to ecu  355 lph pump 550 nismo yellow injectors side feed aftermarket regulator  and won’t start with base aem tuner basic tune eventually flipped cas 180 degree so it triggers on correct stroke not in exhaust cycle  Now it won’t start Wideband reads 10 and 11 at lowest fuel setting  and will share calibrations soon for aem tuner i think something is wrong in aem tuner    please if you have any information, am very grateful         
×
×
  • Create New...