PhilCook

iTrader: (1)

Or to swap them for some beefier items

stevieturbo

if it's bent valves it would seem the pistons arent the problem.

As long as the piston design is sound, for a relatively low powered engine they dont need to be super dooper forged etc. They just need to be a decent design.

GVK.

Agreed with Stevieturbo, you really must have the pistons out, if this is happening.


Would bent valves cause that??

stevieturbo

If the valve guides have been damaged and these are allowing pressure past then maybe.

But more to the point...how the hell did it end up with bent valves ? The timing belt must have jumped teeth or something

GVK.

Chain on the Duratecs, if a timing chain guide/tensioner has failed and then timing slipped you'd expect it to make a noise wouldn't you? Just trying to remember if the cam sprockets are keyed on them, don't think they are. Must be a couple of years since working on a Duratec chain.

edit - http://www.sbdev.co.uk/Duratec/Cams_Springs_Valves.htm



Looks like they aren't keyed, so just held by the bolts.

Has any work been done to the cams when the supercharger was fitted?

mikemcc03

no work on cam as far as im aware.
guy told me the chain had been done but no receipt so either lies or maybe a bad job.
i cant explain how it bent valves or understand it myself but thats what has happened.

piston 1


piston 3


couldnt get better pics or more as phone died an no camera to had.