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Home > 998cc > Head Gasket for 998T

joeybaby83

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Isle of Man

Any recomendations?

Will be using a 12G202 head to start with.

Cheers

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"



Paul S

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Has anyone experienced any problems with a standard gasket on a 998 turbo?

I'm about to bolt my 12g295 head on and am planning on using the standard gasket.

I considered the 1275 gasket, but there is one waterway hole missing.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


wil_h

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Betwix Harrogate and York

Don't put a 1275 gasket on when using a small bore head. You'll just fill your cylinders with water.

The water holes in the head overlap the fire rings on no.1 and no.4 cylinders. I know this, because like a dick I grabbed the wrong head gasket when putting my N/A 998 back together.

All you can do is try a decent copper one and see what happens.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Paul S

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On 2nd of Jan, 2007 at 09:09pm wil_h said:
Don't put a 1275 gasket on when using a small bore head. You'll just fill your cylinders with water.

The water holes in the head overlap the fire rings on no.1 and no.4 cylinders. I know this, because like a dick I grabbed the wrong head gasket when putting my N/A 998 back together.

All you can do is try a decent copper one and see what happens.


Thanks Wil.

I can only find the standard payen type copper/steel composite gasket. I'll try that and report back, unless someone can recommend a copper one.

I've been thinking a bit further ahead to running higher boost and the option of 11 studs on a small bore. Is there a 11 stud gasket available? I know the 1275 gaskets all seem to have the extra holes, but I've never seen a small bore one with 11 holes.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


wil_h

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Betwix Harrogate and York

I don't know of any small bore head gaskets with 11 stud holes. But they would be easy to modify.

The other option is to block up the holes in the head so you could fit a large bore gasket.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Vegard

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Norway

Has anyone got any part numbers for the "best" 998T gasket?

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



Paul S

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You can try TAM2121 which is the latest Rover item. I'm using this but engine has not ran yet.

Moss now do an uprated gasket MST207, but I've not seen one.

Also Minisport do a GEG302, but again not seen one.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


wil_h

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Betwix Harrogate and York

I've been using this on my road 998

http://www.minispares.com/Product.aspx?pid=37141

Only running 6.5psi, but done 2000 mile and no problems so far.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


gr4h4m

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Chester

I'm going to use the same one as Will_h ordered it today.

I run a supercharger and I don't care the TB is on the wrong side.


valant1

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I have a std head gasket on my 998 with a 1300 head and 11 studs , i have drill my gasket


Vegard

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I pick holes in everything..

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Norway

A 998 gasket on a 1275 head? Great idea, NOT!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



alpa

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Grenoble, France

Did someone try the Calver's gasket ?
It's on the
http://www.calverst.com
Cylinder heads section, ref CTS2006

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm


PaulH

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Dublin Ireland

Its ni on impossable to 11 stud a small bore head as the casting is shorter and there is no piller inside for the hole to go through also at the termostat end there is no room as the stat is closer to the rocker cover

On 17th Feb, 2009 Rob H said:

I find the easiest way is to super glue the bolt to the end of one of my fingers.

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Vegard

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Seems as there is a new kid in town:

http://www.minispares.com/Product.aspx?ty=...0/998/1098%20...

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



bigmini998

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Costa del Northern Ireland :)

sounds like a bk450 but for a 998 :) who will be the first to try it??? :)

Edited by bigmini998 on 28th Jan, 2009.

That mini is determined to Kill me!!!!


gr4h4m

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Chester

whats the bet its like this one?

http://www.calverst.com/shop1/index.php?ma...&products_id=70

I run a supercharger and I don't care the TB is on the wrong side.


joeybaby83

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Isle of Man

id have said that, but they seem to have different compressed volumes...?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"



Advantage

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Near Paris - France

The new type head gasket are out of stock on both Minispares and Calverst.

Too bad !

Rusty by nature

On 23rd Jun, 2008 paul wiginton said:

They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!"


Paul S

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On 28th Jan, 2009 Vegard said:
Seems as there is a new kid in town:

http://www.minispares.com/Product.aspx?ty=...0/998/1098%20...


I just bought one of these to hold in readiness for the 998T gasket going.

It's made by ACL in Australia, part no AP250MT.

ACL are in administration, so get your order in before stock runs out.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


wil_h

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Betwix Harrogate and York

I spoke to rich at MS the other week and he said they were not currently available, so I've had to use a copper one.

Did yours come from MS?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Paul S

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Formerly Axel

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Yes, got it from Minispares last week.

Exactly as Vegard's link above.

Just need to build a new engine to use it!

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


alpa

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Grenoble, France



On 18th May, 2010 Paul S said:

On 28th Jan, 2009 Vegard said:
Seems as there is a new kid in town:

http://www.minispares.com/Product.aspx?ty=...0/998/1098%20...


I just bought one of these to hold in readiness for the 998T gasket going.

It's made by ACL in Australia, part no AP250MT.

ACL are in administration, so get your order in before stock runs out.


I used this AP250MT on 998 and g295. So far at 1bar it stands, but let's see a longer period and on the track.
Seriously racing guys told me they've been using this kind of composite gaskets for years with no problems. On 1300 reving 8-9k.

Edited by alpa on 20th May, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm


wil_h

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I thought that I should update this thread with my experience of the 'new kid in town gasket'

Basically I have now had two failures of the new gasket, one after a few thousand miles, one after a few hundred, so the first failure:

After lunching a copper gasket when I had boost control issues and lots of det I put one of the black ones on, this was just before Le Mans. I was running around 8psi, no pinking, no overheating, a nice relatively unstressd life for a head gasket. It then failed catastrophically. You can see the photo below.



Now, it has to be mentioned that I had torqued the head to 68Nm (as standard) but the gasket packet specified staged torquing 20Nm, 40Nm then 54Nm.

The following photo shows another firering with damage and likely to fail soon:



I therefore put this failure down to me over-torquing the gasket.

So, on to the second failure. This time I torqued to 54Nm in stages as specified. The gasket failed, with a leak from cylinder to coolant, see photo:



Now, having experience of this type of failure I know it's owing to under-torquing. I calibrated my wrench last month by the way, but it's unlikey to be high at 68Nm and low at 54Nm in any case.

I'm not suggesting that this gasket is a pile of junk, just it may not be suitable for the extra heat and pressure of a turbo engine.

My advice is that the Copper type (that are half the price) are more than up to the job and I wouldn't suggest using the Black type.

I'd be interested in others experience. It is worth noting that these gaskets are not in any way the same as the BK450 in material or construction and that the fire rings on the copper gaskets are actually thicker.

I hope this is of use to some.

Edited by wil_h on 10th Sep, 2010.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Prescott Modified Series Production upto 1400cc course record holder
Oliver's Mount Modified Series Production upto 1400cc Hill record holder
Thoresby Park Modified Series Production upto 1400cc course record holder

www.twin-turbo.co.uk

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack or imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Paul S

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I helped keep this site alive!

7968 Posts
Member #: 573
Formerly Axel

Podland

Thanks for the warning.

Mine will stay on the shelf for now.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."


alpa

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Grenoble, France

I must have the same as you wil.
So far it stands after many sessions of mapping with 25-35C outside temperature and 2000 km. I'm going to the track soon, we'll see. For sure we'll go in two cars and will bring a towing bar.

Edited by alpa on 10th Sep, 2010.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

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