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Forums › The Car › 206 Problems › Any though why the engine blown up? |
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 Posted: Sun Jun 10, 2012 8:00 am |
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Joined: Feb 07, 2010
Posts: 3085
Trade Rating: +12
Location: Essex
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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
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Posted: Sun Jun 10, 2012 10:18 am |
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Joined: Feb 07, 2010
Posts: 2505
Trade Rating: +19
Location: West mids
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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.
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Posted: Sun Jun 10, 2012 10:57 am |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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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:-
www.camshaftshop.com/c...-clearance
www.racingheadservice....arance.asp
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Last edited by kandlbarrett on Wed Jun 13, 2012 5:32 pm; edited 1 time in total
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Posted: Sun Jun 10, 2012 11:15 am |
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Joined: Feb 08, 2010
Posts: 10151
Trade Rating: +12
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| 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:-
www.camshaftshop.com/c...-clearance
www.racingheadservice....arance.asp |
those links are helpful, thanks 
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