Well, because the con rod bearings went poof for the second time now, I've bought an other shortblock for my ST205 wrc.

I want to do it right his time because I'm sick of all the trouble thi engine has given me.

First my head made a wierd ticking/clicking sound which turned out to be a worn out bucket that damaged the bucket hole, so i needed a new head.
Then the conrod bearings went poof, got my crank polished and new bearings fiited.
When we started the car, they went poof again so now I got myself a new shortblock....

Now my question is, because the head has been decked at least 3 times now, can I still use the OEM head gasket or should I use a thicker one like the HKS 1.6mm stoppertype HG?

Dennis

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ST205 WRC

I'd be thinking thicker head gasket time...

Seen the Cometic ones? Much cheaper than that HKS jobbie...

try http://www.gtschris.com

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
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Turbocharging - the replacement for displacement

Do they make one for the rev.3 ???
How thick is the cometic HG?

So many questions....

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ST205 WRC

AFAIK - Cometic do not make one for the rev3.

It's going to be either a standard Mr Toyota headgasket which is a metal 1.0 mm thick gasket;
(Alternatively - http://cgi.ebay.co.uk/HEAD-GASKET-SET-TOYOTA-CELICA-ST205-2.0-3SGTE-3S-GTE_W0QQitemZ370121010009QQcmdZViewItemQQimsxZ20081128?IMSfp=TL081128119004r201)
or
an HKS Steel Cylinder Head Gasket from Fensport http://www.fensport.co.uk/parts.htm
- 1.2 MM £155 + vat + p&p
- 1.6MM £165 + vat + p&p.
I would also go for the ARP Uprated Cylinder Head stud kit.

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Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

Which one do you think I should use?

Is there a lot of difference when using a 1.2 or a 1.6mm gasket??

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ST205 WRC

OK - this is where it starts getting technical!
Unfortunately, I'm not knowledgable enough or qualified to give a detailed answer, however, the thickness of the gasket alters the 'squish'.
Here's a link I found which may help http://www.rbracing-rsr.com/squishcalc1.html.

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Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

Ok thanks for the link
very interesting stuff

I've read on GT-fours.co.uk that the OEM gasket meassures 1.4 mm when new and 1.2mm when compressed... so this rules out the 1.2mm HKS gasket doesn't it?

with the head being decked a couple of times, I think I should use the 1.6mm one..

But I know as much about engines as G.W Bush nows about running a country

So if anyone can confirm my thoughts on this please do....

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ST205 WRC

Nobody??

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ST205 WRC

Do you know how much has been skimmed off the head each time?

That should give you a good idea

If you want to do it absolutely correctly then CC the combustion chambers. Volumes for the stock head are about somewhere. With this info you could calculate CR for any given headgasket

Thanks, once I get the head off o the old engine I'll do just that

Thanks a million

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ST205 WRC