Dellortoman
Hero member
- Location
- Tasmania, Australia
Got the skimmed Jota head back today, and yes, now that I can see it clearly, that weird mis-shapen edge is just the shape of the cast iron skulls.
The alloy part of the head wasn't too bad (I'd only measured about 1 thou warp) but the edges of the iron skulls in cylinders 1 and 2 were eroded or burnt away, presumably from the hot gases leaking past them. He had to take 12 thou off to get them back to good metal. So the head will be sitting 0.3mm lower. Fortunately, I have one of Phil Todd's 1.3mm thick head gaskets (which conveniently happens to be 0.3mm thicker than standard) so all will be well. I shouldn't have to re-clock the cams.
Now I'm wondering if the BS013 O-rings (1.6 mm thick) that I bought the other day will have enough crush on them to seal properly with the thicker gasket.
Cam
The alloy part of the head wasn't too bad (I'd only measured about 1 thou warp) but the edges of the iron skulls in cylinders 1 and 2 were eroded or burnt away, presumably from the hot gases leaking past them. He had to take 12 thou off to get them back to good metal. So the head will be sitting 0.3mm lower. Fortunately, I have one of Phil Todd's 1.3mm thick head gaskets (which conveniently happens to be 0.3mm thicker than standard) so all will be well. I shouldn't have to re-clock the cams.
Now I'm wondering if the BS013 O-rings (1.6 mm thick) that I bought the other day will have enough crush on them to seal properly with the thicker gasket.
Cam
