#31: Re: Any though why the engine blown up? Author: macj, Location: EssexPosted: Sun Jun 10, 2012 8:00 am ---- I have spare engine parts here.... but needed one new wossner forged piston and H section conrod and a set of rings for starters..... the crank I have plenty of.... I am just glad the head survived as its been worked quite a bit
#32: Re: Any though why the engine blown up? Author: spike_202, Location: West midsPosted: Sun Jun 10, 2012 10:18 am ---- Lol mine was the outher way round mac my head was mashed needed a complete over hall and re-polish&ported then used my original bottom end as I had 2 engines so I could have the work done to one then just swap it over.
#33: Re: Any though why the engine blown up? Author: kandlbarrett, Location: SwindonPosted: Sun Jun 10, 2012 10:57 am ---- All the pics suggest valve has met piston not plug. People also forget that under the enormous dynamic loads the clearance between valves and pistons actually reduces with revs as the crank flexes and the conrod literally stretches.
It can also be a case of the hydraulic lifters not coping with enormous revs when you hit the wrong gear or even the belt jumping a tooth.
Tuned cams with or without skimmed heads need VERY careful cam timing and checking of clearances or the result are what you see in the picture.
The following links are worth a read as they will give a good feel for what is required:-
#34: Re: Any though why the engine blown up? Author: Seabook, Posted: Sun Jun 10, 2012 11:15 am ----
kandlbarrett wrote:
All the pics suggest valve has met piston not plug. people also forget that under the enormous dynamic loads the clearance between valves and pistons actually reduces with revs as the crank flexes and the conrod literally stretches.
It can also be a case of the hydraulic lifters not coping with enormous revs when you hit the wrong gear or even the belt jumping a tooth.
Tuned cams with or without skimmed heads need VERY careful cam timing and checking of clearances or the result are what you see in the picture.
The following links are worth a read as they will give a good feel for what is required:-
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