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Premium Member
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Discussion Starter #22
Well I've spent too much on it to give up just because I've scrapped a cylinder head and piston. There are some scratches on the afflicted cylinder which I think will hone out, and I have a spare cylinder head. The new piston is already ordered, and a soon as it's all back together I'll be checking VERY carefully what clearance there is between valves and piston at the minimum clearance point. If I find nothing exceptional (and I don't expect to have much more than 0.5mm clearance anyway) then I'll be looking very carefully at valve collet placement, and checking that all those little buggers, every single last one of them, are tucked up in bed nicely. The only other thing that could possibly have caused just the one cylinder to eat itself could possible have been that the valve clearances were too small, causing the valve to open just that little bit further. The rest would be down to accumulation of tolerances.
 

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President: Team Full Chat
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I bet the valve wasn't set. I always stress out about that and use a brass drift on the top of the valve and tap it with a hammer a few times to make sure they're in. Even then, it's still worrisome. I had the timing off by SEVERAL degrees on my cams on my 93 with the slotted cam sprockets for an entire season once. I got some different numbers from different tuner and leaned it was so far advanced that I should have had interference but I didn't. just my opinion but I don't think you'll get your damage from a skimmed head and deck. Anyway, knowing how you operate here, I know you'll check all the measurements and see where you're at. That's why we appreciate your work.
 
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