Jump to content
SAU Community

Head Off Rb25t

skidkid

By skidkid,
in Engines & Forced Induction

 Share

Recommended Posts

skidkid Proficient

skidkid

Posted
Posted (edited)

I got the head off our 98' Stagea yesterday to replace blown head gasket (80k). While the head is off I thought its a good time to give the ports a tickle. Are people match porting out to gasket sizes on both inlet and ex. or just make sure gases are not hitting a shoulder? Are people removing lump in exhaust? Also are people replacing head bolts??

Edited by skidkid
Link to comment
https://www.sau.com.au/forums/topic/250932-head-off-rb25t/
Share on other sites
Dale FZ1 Veteran

Dale FZ1

Posted
Posted

I found the R33 spec factory manifold gaskets pretty well matched already, but checked and touched up both sides where necessary.

That lump in the exhaust port I smoothed out the sharp leading edge considerably and blended them in to the overall port shape.

The short radius in each port, leading onto the seat was where I spent a fair bit of time. Ex-factory that really was an abrupt edge and needed work.

Overall, not much material taken out but quite a bit of finishing work that the factory doesn't do. I'll have an idea later this month if I'm happy with my work :D

New head bolts not essential, but aren't expensive and should be replaced if the engine will see a bit of work.

Link to comment
https://www.sau.com.au/forums/topic/250932-head-off-rb25t/#findComment-4345566
Share on other sites

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

    • Gareth87
      What should I do next to hold the head on

      By Gareth87 · Posted

      I can see between the water jacket and cyl 3 there wasn't a hard line of combustion gas. It certainly appears that the issue is coming from there. Yes, checked the tension. All at 100ft lbs where I set them 5 years ago. These blocks can crack but generally when they have been over bored. Mine is only 0.5mm oversize at 89.5mm. They break between cylinders around the 91mm mark. No sign of that with mine. My gut feeling is the head gasket lifted a while back when the studs stretched and i bandaided it by retorquing the studs. It's finally let go.
    • TurboTapin
      new 1.5 LSD issues/concerns

      By TurboTapin · Posted

      My Nismo 1.5 churps a bit on reverse turns when cold, but besides that feels like a stock diff.
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Yes, but, I paid cash and I'm pretty sure the receipt was in the bin 10 minutes after I got home Note to self, keep all receipts
    • MBS206
      NC MX5

      By MBS206 · Posted

      Bunnings would have just handed you your money back on that one!
    • The Bogan
      NC MX5

      By The Bogan · Posted

      So, version 4 intake is on its way I was looking at these a while ago but at around $200 or more it was a little pricey for something that might not work, but, I had it in my watch list, but, I got a message saying it was on special, and I had a code thingie to use, it eventually came in at $120 delivered, so BAM, BUY NOW.....LOL I'll need to have a look when it arrives but I feel it will "look" better than what I currently have, as it comes with a PCV fitting, so I will be able to get rid of the alloy pipe that goes to the throttle body with the PCV fitting  Well, that's what the voices in my head are telling me  Oh, and this happened today Yeap, it was a Trojan, and it was cheap, so I headed back to the hardware store and actually spent a little bit more on a heavy duty,  one that was actually recommended by a plumber mate, a Cyclone one with a fibreglass handle that is actually rated for clay The broken shovel will eventually be "modified" into a short handle shovel
×
×
  • Create New...