scottybo Posted November 18, 2013 Share Posted November 18, 2013 may be a silly questions im after a new set of pistons for my 1.8, it let a cambelt slip some time ago, before i owned it and as a result all the pistons have small amounts of damage from the valves hitting them (they may very well be fine to use but for my pace of mind id prefer to replace them. my questions is, which would be the best pistons to use, just the standard silvertop ones? or are the pistons from the 1,8 focus any different / any better.....and would focus pistons fit? only reason i ask is ive found chap who sells pistons rods and rings for a tenner a piece which sounds reasonable. but they all came from a focus Link to comment Share on other sites More sharing options...
Stu Posted November 18, 2013 Share Posted November 18, 2013 You need pistons that are the right size for the bore, which means you need to measure each of your bores (properly) and find a suitable piston. The specified piston to bore clearance is about 1.7 thou max IIRC. Link to comment Share on other sites More sharing options...
scottybo Posted November 20, 2013 Author Share Posted November 20, 2013 I think ill just try and find some regular ones then Link to comment Share on other sites More sharing options...
Stu Posted November 20, 2013 Share Posted November 20, 2013 Wasting your time. Link to comment Share on other sites More sharing options...
scottybo Posted November 20, 2013 Author Share Posted November 20, 2013 Wasting your time. mine are damaged though Link to comment Share on other sites More sharing options...
sidrick Posted November 20, 2013 Share Posted November 20, 2013 Why not get a complete bottom end? Link to comment Share on other sites More sharing options...
Stu Posted November 20, 2013 Share Posted November 20, 2013 Wasting your time. mine are damaged though .. and your new/used ones will quickly damage too if they're not the right size. Link to comment Share on other sites More sharing options...
scottybo Posted November 20, 2013 Author Share Posted November 20, 2013 Why not get a complete bottom end? looks like a might have to Link to comment Share on other sites More sharing options...
sidrick Posted November 20, 2013 Share Posted November 20, 2013 Seems like the sensible thing to do. Link to comment Share on other sites More sharing options...
opexo Posted December 13, 2013 Share Posted December 13, 2013 (edited) look at it this way: (long story shortened but happens pretty often around) a person opens his engine, changes piston rings etc, puts everything back together in the right way ofc, everything is by the book. Fires up the engine - rough idle/running, excessive oil usage, bad compression.Reason: as the engine runs the cylinders get an oval shape (not all, possibly those on higher mileage, but still..) So perfectly round new piston rings in oval "cylinder" doesn't sound good. Putting in not just piston rings but pistons which aren't made for that grade of engine wear is even badder. Current piston rings have the shape of the cylinder if i can say it that way. Best thing to do if pistons are still in the block is clean them and if they are ok fill the cylinders with kerosin to loosen the piston rings from any deposits and move freely. That i'd do. Or if they are already out of the block i'd go straight for 2.0. Or if this is not an option i'd have to rebore/rehone the cylinder to get it round again and then put in the according pistons. Edited December 13, 2013 by opexo Link to comment Share on other sites More sharing options...
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