oadamo
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| posted on 31/5/07 at 06:47 PM |
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zetec over bore
hi does anyone no if a zetec 2L blockcan be bored out to 97mm as ive been given some fored pistons that can take 600bhp and i want to fit them now
now now lol
adam
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ned
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| posted on 31/5/07 at 06:49 PM |
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97mm sounds huge, what's the standard bore on a zetec? My xe is bored out +2mm from 86-88 so in now a 2.1 and that's on the limit for a
'standard' block unless you get a purpose made ally block with offset bores (upto 90mm) and have a lot of £ to spend!
Also bear in mind the gudgeon pin size may be different and require special rods making up, also the piston crown and squish/compression and valve
recesses etc may be completely different, basically it will cost you more than the power the engine will produce to fit them if it's even
possible (ie buy a better/faster/more powerful engine to start with)
Ned.
[Edited on 31/5/07 by ned]
beware, I've got yellow skin
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oadamo
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| posted on 31/5/07 at 06:52 PM |
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quote:
Originally posted by ned
97mm sounds huge, what's the standard bore on a zetec? My xe is bored out +2mm from 86-88 so in now a 2.1 and that's on the limit for a
'standard' block unless you get a purpose made ally block with offset bores (upto 90mm) and have a lot of £ to spend!
Also bear in mind the gudgeon pin size may be different and require special rods making up, also the piston crown and squish/compression and valve
recesses etc may be completely different, basically it will cost you more than the power the engine will produce to fit them if it's even
possible (ie buy a better/faster/more powerful engine to start with)
Ned.
[Edited on 31/5/07 by ned]
84.8 standard this doesnt sound good already 
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ned
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| posted on 31/5/07 at 06:53 PM |
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The wall thickness of the block won't even be that thick, they will never fit, that's over 1/2" oversize!!
Ned.
[Edited on 31/5/07 by ned]
beware, I've got yellow skin
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oadamo
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| posted on 31/5/07 at 06:55 PM |
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iam gonna sellotape them to the block then at least they will look good 
adam
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ned
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| posted on 31/5/07 at 07:04 PM |
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[exits stage left - quickly]
beware, I've got yellow skin
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oadamo
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| posted on 31/5/07 at 08:42 PM |
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thanks for your help ned
 anyone no whats the max you can bore a 2L zetec out to iam gonna look at buying some proper size
pistons lol
adam
[Edited on 31/5/07 by oadamo]
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djtom
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| posted on 31/5/07 at 10:21 PM |
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If it's for a zetec turbo conversion you can use the vauxhall c20let or c20xe (?) pistons with an overbore to 2.1 - the early ones are
supposedly forged and conveniently drop the CR down to about 8:1, but they are not as good as using decent forged pistons and will melt at about 1 bar
boost. That's what I gathered from my ZT research anyway. I decided to just use a decompression plate until I could afford some proper
pistons.
97mm bore? what the hell were they out of?! Think you'd find the pistons would overlap between the bores.... :-)
Tom
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