Hi do you's think this arrow is the direction of what way it goes in? Normally they are on top of the Pistons and are directed to timing belt but this am assuming Point to front of engine?

 

I would say for direction of rotation. Front of engine sounds logical unless somebody knows better?

 

Can u phone the place u bought them from and ask?

 

Forged or cast?

 

That what i was thinking. Just wanted to see want other people's Views.

 

Don't know how hard it would be to get in contact with cosworth. And the are forged why would that make a difference?

 

What is the crown shape like, and is the pin offset ?

 

These are the Pistons when I got them new roughly about six years ago I pulled them out of the engine to change the damage rod.

 

You're going to have to put a 90 degree twist in the rods to get that arrow to point forward.

 

Its fwd,

The only difference I can see is the skirt looks like it has a no symmetrical cut out to miss part of the crank? Valve cutouts look the same from the pics. Which way round were they before?

Rob.

 

Ha that's the problem I can't remember didn't mark them when I pull them out. I stripped it then took awhile for the rods to turn up.

 

Ahhhh, that makes more sense! I would go with arrow to front of car by default but have a look to see if the skirts are cut out to avoid a crank counter weight. I can't see any other differences. However the piston pin offset might not be equal, the rod end could be closer to the intake valve or exhaust valve if the offset is not equal.

Rob,

 

Thanks rob we had a quick look at the pin to see if it was offset but we'll have another look. You still have your escort?

 

Yes I do dude, its been tucked up in the garage for 5 years now whilst I mess about with other things I started working on it again a few weeks ago so a resurrection might be on the cards. I'm glad you still have yours mate! how come the engine strip down?

 

Or good glad you didn't sell it. Be good to see it. Took it on a track day at knockhill and suffered from oil surge with having no baffles in sump. Took out the crank and no1 rod (heat damage) manage to drive the 3hr drive home no problem.

 

The bigger valve cut outs are inlet side

 

I would say the Arrow points to the thrust side of the bore
Standing at the front of the engine the thrust side is on the left.
This is proberbly because the gudgeon pin is offset on a 4x4 piston to stop piston slap when cold.
Cheers tim

 

These are zetec Pistons mate not out of a yb. They are just made by cosworth.

 

Awesome mate, bet yours was a bit of a handful at a track day! Bit of a weapon before the problem though!

Rob,

 

yb or not they still show which side is the thrust side

 

I gest that mate I was only double checking I was right before putting the in and just letting you know it wasn't a yb.