Jump to content
SAU Community

Recommended Posts

6 hours ago, DTT_Eruc said:

What's the oem specs for clearances on the rod and main ?

These are for RB26, I doubt that RB25 will be different but I don't have a manual for that engine.

Crank is 0.028-0.046mm (0.0011-0018 inches)

Conrod is 0.020-0.039mm (0.0008-0016 inches)

It's actually a bit more complicated than that because main and conrod journals/tunnels/rods are graded at the factory and then bearing thicknesses are selected to get the correct clearance.      OTOH, with an aftermarket set of shells it's all one size, although there would be a very small variation due to manufacturing tolerances.   

In your case, if you're confident the journals are in good condition (short of actually measuring them with a mic....not vernier and most people don't have access to the specialist bore gauges required for main tunnels and rods) and you have the original bearing shells still in their original locations on the rods and block, you can measure the clearance with plastiguage, which will be a reasonable guide to the condition of the bearings/journals.     

 

  • Thanks 1

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

    • Oh, also, forgot to add these photos I believe.
    • Thought i'd update on this. I was able to get in contact with Craig Lieberman and later on Darryl Alison (owner of Kaizo Industries). Darryl was able to help me verify that my car was in fact one of theirs and is helping me find more info on mine !
    • 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.
    • 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 😂
    • 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.
×
×
  • Create New...