Guest s6boy1979 Posted April 18, 2011 Share Posted April 18, 2011 Hey Can anyone tell me what the difference is between a xr3i and a RS turbo cylinder head? Cheers Link to comment Share on other sites More sharing options...
Guest Lee81 Posted April 18, 2011 Share Posted April 18, 2011 (edited) I don't think theres much difference. Valve seats are hardened on turbo engine. Also think exhuast valves are larger diameter. Obviously cams are different also which includes the valve springs having a higher rate. Edited April 18, 2011 by Lee81 Link to comment Share on other sites More sharing options...
Guest s6boy1979 Posted April 18, 2011 Share Posted April 18, 2011 Ok thanks Link to comment Share on other sites More sharing options...
iansoutham Posted April 19, 2011 Share Posted April 19, 2011 I don't think theres much difference. Valve seats are hardened on turbo engine. Also think exhuast valves are larger diameter. Obviously cams are different also which includes the valve springs having a higher rate. Series 1 heads had sodium-filled valves, but nothing else. The springs are the same rate, and the cam is specific for turbocharged applications. IF you put a turbocharged-spec cam in a N/A engine, it will be down on power due to the overlaps. Link to comment Share on other sites More sharing options...
Guest s6boy1979 Posted April 19, 2011 Share Posted April 19, 2011 So I can put an xr head on a turbo bottom end if I swap the cam? Link to comment Share on other sites More sharing options...
iansoutham Posted April 19, 2011 Share Posted April 19, 2011 So I can put an xr head on a turbo bottom end if I swap the cam? What year XR3i? They changed cylinder heads around 1986(ish). Early heads have a dished chamber, late ones have a big "V" built in with much smaller exhaust valves and would be no good for turbocharging. Link to comment Share on other sites More sharing options...
Guest s6boy1979 Posted April 19, 2011 Share Posted April 19, 2011 It's a efi 89 xr3i Link to comment Share on other sites More sharing options...
iansoutham Posted April 21, 2011 Share Posted April 21, 2011 It's a efi 89 xr3i Not interchangeable. The injection system is different for a start, before you go near anything else. Link to comment Share on other sites More sharing options...
Guest s6boy1979 Posted April 21, 2011 Share Posted April 21, 2011 So I best off getting a engine from the fiesta RS then Link to comment Share on other sites More sharing options...
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