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Fiesta-Si.com • View topic - Xr2i head on my 1.6 block??
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adz19
PostPosted: Wed Feb 08, 2012 7:14 pm 
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Hi I'm thinking on converting my si. The obvious option is a 2.0 swap but i've been told that an xr2i 1.8 head could fit my 1.6 block? Has anyone done/heard this? Apparently the valves are too small to get anything decent out of the 1.6 16v head but the 1.8 16v head is better?
Thanks. :blahblah:
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megaflea
PostPosted: Tue May 15, 2012 12:30 pm 
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In theory it will fit,
the 1.8 head shares the 2.0 larger valves so flows better (the 1.6 valves are like chocolate buttons)
the blocks are practically the same
the compression might be lower with the standard ford headgasket but you can fit the early (1998-1999( focus mls head gasket
which is half as thick and should bring the compression in line.

i had a spare xr2i 16v head but the theiving gypsie pikies stole it off my drive along with the incredably hard to find rs1800 throttle body and not so hard to find HO manifold)

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meilack
PostPosted: Tue May 15, 2012 12:49 pm 
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1.8 and 2.0 head won't fit the 1.6 i believe.
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big g1985
PostPosted: Tue May 15, 2012 10:23 pm 
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wouldnt even bother messing with the 1.6 lump just drop in a 1.8 or 2ltr
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SLEEMAN
PostPosted: Tue May 15, 2012 10:46 pm 
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i've heard that sticking a 1. 8 head on a 2.0 block increases the compression ratio so in a sense good for small time racers etc. but 1.8 on 1.6 to me sounds like kabooom! in a fiesta its so easy to do an engine conversion!! if you want because 2.0's are so sort after, get a 1.8 115ps engine from an escort or mondeo more common to find, add 2.0 cams etc and you should have a good bhp figure!
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