| Gallery, Projects and General > How do I?? |
| SABB valve job |
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| Bogstandard:
Ade, Bob has it spot on. Just got to be careful of any water galleries that are around. If you are careful, you can actually cut the valve angle in the new cast iron seat as you are making it in the lathe. Then after it is fitted, it should be very close to what is required, and may even be grindable and lapable to aligment. I have some nice cast iron left over from the Scott engine build if you get stuck, and if you want to accurately bore the head, my mill and all equipment for aligning it all up is here at your disposal. John |
| HS93:
Hi have you thought of NEWTONS ENGINEERS or John Lucas in liverpool (havent used lucas since he re bored a marina block for my midget) or even lane end up by me. they all do seats for petrol conversions. may be cheap as it is only two seats and a od ball job. Peter |
| AdeV:
Thanks Chaps; I can see that the overall vibe is "probably best left well alone"... Bob, I'm curious about the idea of screw-in inserts; how does one cut enough thread to get a decent hold of the new metal? I'd figured on boring a maximum of 1/4" into the head, and maybe 2mm oversize; for a fairly slimline steel seat. I'm guessing that to install a screw in cast iron seat would need a much bigger & deeper hole? I am somewhat limited in that the valve is within 2.5mm of the cylinder wall; I don't really want to cut into that bit if I can help it... |
| AdeV:
--- Quote from: HS93 on March 23, 2011, 12:27:00 AM ---Hi have you thought of NEWTONS ENGINEERS or John Lucas in liverpool (havent used lucas since he re bored a marina block for my midget) or even lane end up by me. they all do seats for petrol conversions. may be cheap as it is only two seats and a od ball job. --- End quote --- Thanks Peter, I'll pass those names on. The owner had tried the Birkenhead Engine Centre, who'd hummed & hahed & quoted over a hundred quid - which seemed excessive. Especially since I have previous with them, and unless they're under new management, wouldn't recommend them to anyone... |
| lordedmond:
AdeV A thought can you not buy off the shelf valve seat inserts ? after all all ali heads have them , you do hear of a lot of people who have had the seats done on the leaded engines. of course if you go back far enough to austin ruby days they had hard seats because the fuel did not have lead in Stuart |
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