Rb26 Head And Machining - Questions

[Uncustom]

Sorry - found my answer after searching. Mods please close. Thanks for replies.

Edited March 24, 2014 by Uncustom

[GTSBoy]

That's f**ked. It needs to be repaired. Ground out, welded up, remachined for the internal shape of the chamber and flat head surface.

[Jazzadub]

Is the damage in cylinders 4-6?

To me it looks like detonation damage. And the reason it happened in cylinders 4 to 6 is that those cylinders run hotter and leaner than the front three if injector trim is not tuned appropriately.

Anyway, I don't think you can or should machine the head that much - but I might be wrong.

I had an RB26 head with similar damage and it needed to be repaired by welding over the affecting areas and then correcting the combustion chamber shape.

I would check with an engine shop that specialises in head machining and reconditioning.

Edit: as GTSBoy said.

Edited March 24, 2014 by Jazzadub