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Hi
Been doing some research on head gaskets for this build.
Athena do a 1.6mm MLS head gasket for the Zetec But I don't know if this will lower the compression enough. Anyone know or work out the CR? STD head, Block, Pistons.
I sent Athena and email asking if the could make one (1.8mm) and the email I got back was this.
First of all thanks for your email and your interest in our products.
Unfortunately there is no need for us to add such a small different thickness to our range so it is not among our future development.
Anyway we of course can develop it for you. In this case the gasket retail price would be 113€ each but we need 25 pieces as minimum order and a tooling cost of approximately € 5.000
On the contrary we could manufacture a gasket with 1.7mm thick. Using the same tooling of 338269R, so without any additional cost for the tooling and a minimum order of 15 pieces.
So if they can make a 1.7mm why not 1.8mm. I guess if I ask there tell me and most likely to do me the plates.
So I am now thinking two gaskets or have 0.2mm taken off pistons.
St or plain zetec Blacktop they are both 0.6mm and the same mls design. The older silvertop has a thicker gasket and is said to be more tolerant to surface finish.
Any way, the guy that has the high horsepower drag fiesta ( ignition advantages ) sells Forged pistons and rods and in the description he lists the Cr against differant hg thicknesses.
0.25mm is a change in Cr of just over 0.1:1. So the differance between 1.6mm and 1.8mm is around 0.07:1.
Now this is a rough and ready assumed calculation but the more I look at it, the more I think I would be just as happy using the cheaper gasket.
If you really really wanted the ford gasket I would sell you mine at what I paid but I am not posting it.
I am 100% the £180 RS gasket is not just 0.6mm thick its way thicker than the ST170 gasket.
infact i think i still have the original ford gasket that was removed from the St170 engine i will check tonight
Got the part number ? RS gasket is defo 0.6mm thick, Ajusa do a RS gasket and it’s 0.7mm but that’s the thickest I could find that cross ref matched fords part number,
Fords ST170 gasket is 100% thicker than the RS one, the thinnest st170 gasket I could find is 1.2mm also made by ajusa......
Doesn’t sound like you were sold a RS gasket tbh
St170 4 later is a a much better gasket to use imo as it has more “squishy-ness” about it to help seal
Ok so as I had said I was under the impression that the RS gasket was the thicker of the 2 first picture is the one I bought last year using the reg of a mk1 focus RS and as I thought 1.8mm thick 2nd picture is the one I removed from the std untouched low mileage ST170 as you can see it’s only 1.0mm thick
Last edited by colins2; 02-07-2018 at 08:10 PM.
Reason: Text
22-06-2018, 10:34 AM
Zetec Turbo St170/Blacktop Head Gasket
