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[danchev]

Any ideas whats the CR in 2.0 silvertop with Focus RST pistons and rods, using stock 1.8mm silvertop head gasket?
Thanks in advance

[freak power]

Any ideas whats the CR in 2.0 silvertop with Focus RST pistons and rods, using stock 1.8mm silvertop head gasket?
Thanks in advance

Silver top head gaskets are crap, you need to use a ST170 head gasket as ifs a MLS gasket.

[danchev]

If I remember correctly ST170 gasket is 1.2mm ... 1 mm compressed.
This one? http://www.ebay.co.uk/itm/FORD-MONDEO-F ... 2c597aacb5

I found so much information for let pistons and almost nothing for Focus RST.
I am worried about CR ... the only place I can find someone says 9:1, but nothing is mentioned about head gasket. Focus RST use thinner 0.6mm MLS gasket and we hope this 9:1 is with that 0.6 gasket, so we can go lower with 1.2mm?

[Smo]

ST170 head gasket is a 4 layer gasket like any standard black top gasket... As you say, it's 1mm when compressed.

As far as I was aware, Focus RS rods and pistons in a silver top with a Focus RS head gasket (as you say, 0.6mm when compressed) produced the same compression ratio as the standard Focus RS engine.

However, if freak power says you require a 4 layer gasket, then I'd be inclined to go with what he says! *Roughly* speaking, the difference of 0.4mm would be, as I say, roughly 0.4 in compression ratio (if I remember correctly from my maths on Zetecs years ago!).

I'm pretty sure the standard Focus RS engine is 8:1.

[freak power]

What turbo are you planning on running

[danchev]

After big power CVH was retired, car now running decompression plated 2.0 silvertop on t3/4 hybrid.
The plan is happy 350 @the engine, turbo is not specified yet ... maybe gt28rs.

[freak power]

Cylinder head work to the combustion chambers and machining the Pistons could give you the required compression ratio.