Piston Vs Screw in Cylinder

[adrians]

What started as a overheating problem and a suspected blown head gasket, has now evolved into replacing the pistons !

The mechanic believe a screw or bolt got into the engine a some stage bounced around in number 3 cylinder for a while then back out through the valves and down into another cylinder. It's going to be an expensive repair bill.

[So Cal Mark]

what does the combustion chamber look like? are the cylinder walls okay?

[adrians]

Yes, The cylinder walls are ok, only require a simple light honing and will be ok. The head was going in to have new springs and valves anyway ! One piston had a crack just above the top ring.

I've managed to get a set of original Turbo pistons, so their going in today.

[So Cal Mark]

turbo pistons? is your car a turbo? Aren't the turbo pistons dished, lowering the compression?

[adrians]

Mark,

Yes the car was original a Turbo, which was removed when converted to RHD, ( space problem with steering box ). I now have all the original parts and intend on restoring it back to Turbo charged. Hence putting in the low compression pistons. In disussions with John ( kristoj ) he was of the opinion the turbo cars didn't have any mods done to the pistons, not even the thicker head gasket.

Regards

[pope]

Hey guys,
My manual says Fuel Injected and Turbo used 8.1: 1 pistons. Nothing about using a 7.6:1 that I thought was being used for some reason.

[bradartigue]

Hey guys,
My manual says Fuel Injected and Turbo used 8.1: 1 pistons. Nothing about using a 7.6:1 that I thought was being used for some reason.

VX Spiders had lower compression, Turbo Spiders were just a regular Spider 2000 with the turbo stuff slapped on.