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[project_mistral]

Just rebuilt the bottom end, cranked the engine round and the pistons protude above the block face by about 2 - 3 mm.

Each one is the same, there has been NO change of the crank, conrods or pistons.

Is this meant to happen?? i cant remember when i took the engine apart.

The only reason i ask is that i thought they were meant to be low compression engines and surely this would make them alot higher??

any help much appreciated.

dan

[Ruishy1]

definately not supposed to do that mate, who rebuilt the engine ?
sounds like the wrong pistons/rods have been used not really something u can diagnose over the 'Net.
but def wrong mate.

Ross

[turbo.jon]

mine just stick out the top buy about 1mm and they are right any higher and the head wont fit on propperly.mine are cosworth racing ones which came un machined and had to be machined and valve cut outs put in

jon

[project_mistral]

i myself have rebuilt the engine and have followed it to the book. this is what i cant understand. If im using all the original stuff other than bearing shells obviously, why is it now doing this?

or did it do it before and i didnt realise.

Im lost as to what to do?!?!

[turboboss]

the pistons should be 1mm below the top of the block Defiantly not protuding out of the block sometimes they are level but most cases below depending what the compression ratio is

[project_mistral]

i have been told the pistons on these engines do come above the block, they should be about level with the head gasket.

Odd it seems, but this is how they are.

i think if you use low compression pistons, then they wont protude above the block, but this one does.

Dan

[project_mistral]

Just spoken to Power Engineering who build these engines, and the pistons DO come above the block by about 2-3 mm.

just to let you all know

Dan

[Ruishy1]

mine didnt, i rebuilt mine last year and they only protruded maybe 20 thou at a push.

[turboboss]

come to think of it my 1.9cvh from power engineering the pistons were level with the block but on my zvh they are 2mm below

[project_mistral]

I would imagine on a zvh you would want to lower compression in which case the pistons will be shaped differently and therefore will come below the face of the block.

Generally speaking the standrad rods and pistons on the turbo cvh engine will come above the black face by around the thickness of the headgasket.

dan