Hi people i bought a 2wd sapphire cosworth thats been rebuilt but been having problems so stripped engine to inspect its got a 205 block been bored out 1mm with pistons to suit but pistons dont sit flush with block they are sticking out past and was wondering if this was ok thanks any help would be good

 

they can protrude as long as they dont contact the head,

dummy build and see if it clears,or skim the pistons

 

whats the problem with her?

 

They're supposed to protrude - the amount of protrusion is down to the spec you're building/blueprinting the engine to..

 

the story goes bought this off a mate who rebuild it with all the best parts motorsport developments then set her up running 32 psi and was very very fast shortly after headgasket went taking the alloy radiator with it this is were i bought it as my mate spent 10k on her then shit starts happening. i replaced headgasket with a 1.3mm triple layer one re torqued head and had to get the radiator re cored were she blew put all back together and she wont stop pressurising water in header tank. every time i give car some up the road and pull over water pissing out of header tank but if i drive off boost it seems ok it has been bled by all my local garages including ford. any ideas thanks

 

did you get the head / block skimmed as apparently this is essential otherwise multi layer shim gasket will not last long?

 

Obviously there is a leak of pressure between gasket and head/block.
You might try a FIBROUS gasket such as escos or group a, this is why I use them.
tabetha

 

yes head been skimmed and block was checked and was very good so didnt need done.