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Home > 998cc > standard 998

jamz

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1342 Posts
Member #: 2292
Tool

Herne Bay, kent

im in the process in building a nice track shell for my dad along side my project...

his rotten shell has a mint 998 engine with 20k on it...

he would like to make it go faster so far we have the other shell down to 560kgs... so that will help

but on a budget what can you sugest for the engine?

say on a 1k budget....

On 27th Apr, 2010 Rick.SPI said:


cant beat a good blowout.


minimole23

3649 Posts
Member #: 1321
Post Whore

Dorset

If it were mine I would do.

12g295 head
t2 turbo on modified metro manifold
mg metro cam
4 pin diff
12psi
maybe a bit of megajolt thrown in too.

Others may be more qualfied to comment.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding


apbellamy

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I helped keep this site alive!

15587 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

Was talking with a mate yesterday. We basically settled on that same spec for his car, but with mirage fanimolds.

On 4th Apr, 2014 oli79 said:
I miss wr london *crying*

On 30th May, 2014 lee.pb said:
when pulling it in the garage.


hazpalmer

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1229 Posts
Member #: 9038
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Windsor

was that fani-molds andy?


booton

23 Posts
Member #: 9792
Member

would u recommed changing the pistons for the added pressure or would standard dished pistons suitable with a good intercooler.


Ben H

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3297 Posts
Member #: 184
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Melton Mowbray, Pie Country

Read this if you haven't already.

http://www.turbo-mini.com/62147.html

Edited by Ben H on 7th Feb, 2012.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.


rubicon

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3747 Posts
Member #: 1709
I like granny porn.

LONDONSHIRE

Spec sounds good james tbh..

On 2nd Oct, 2009 Vegard said:


On 1st Oct, 2009 Jimster said:
I bet my first wank came quicker than your first mini turbo


These new modern turbos with their quick spool up time, would make the competition harder.


On 15th Aug, 2011 robert said:
phew!!! thank you brett for smashing in my back doors .( not something i imagined writing... EVER)


booton

23 Posts
Member #: 9792
Member

yeh read through it but i not say which pistons he used. i have two good complete blocks one with flat top and one with dished.

i though the dished would be better to lower the comp ratio
but the flat tops may be thicker not to burn holes in the top. but they could be the same thickness would not know.


Ben H

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3297 Posts
Member #: 184
Senior Member

Melton Mowbray, Pie Country

The 20 hour Turbo used standard flat top pistons. You will ony get melting problems if your setup is poor or you over boost.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.


booton

23 Posts
Member #: 9792
Member

ok. what would u recommend.
it think the dished pistons will be better to lower the comp ratio. might get away with a 940 head.


Ben H

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3297 Posts
Member #: 184
Senior Member

Melton Mowbray, Pie Country

If you have dished I would use those. Do the CR calcs and see where you get to.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.


booton

23 Posts
Member #: 9792
Member

will do hope fully can use a 940 head as i've finding it hard to find a 295


Advantage

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1127 Posts
Member #: 1450
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Near Paris - France

You're after a 7cc dish (12G295 = 28.4, 12G940 = 21.4) as a 12G295 gives around 9 to 1 on flat top pistons in a 998.

You can calculate the dish from the stated CR from your model as a 998 head is supposedly 24.5 cc.

You can also measure it ...

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!"


wez

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1225 Posts
Member #: 9271
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Stoke on Trent

i thought 998 standard dished pistons were 4 ring type so not really the best type to use???

one day boost will be mine!

On 10th Mar, 2012 Joe C said:
TBH peple stick it everywhere... and theres merits to each...


booton

23 Posts
Member #: 9792
Member

will pop one piston out tomz to show u. block in really good condition. standard bore 998.
seen lots of blocks this the best i've seen.


wil_h

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8444 Posts
Member #: 123
Post Whore

Betwix Harrogate and York


The 20773 will stand a decent amount of boost no problem. The issue is the circlip fitment. Best to use buttons.

On 10th Feb, 2012 wez said:
i thought 998 standard dished pistons were 4 ring type so not really the best type to use???

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.


wez

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1225 Posts
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Stoke on Trent

ah, ok. I've got it in my head from somewhere on here about not using 4 ring pistons, might be something to do with 1275's maybe then. Or I'm just not remembering right full stop.
Also I was taking to an engine builder who said he prefers using circlip pistons and has had no issues revving up to 8/9 k with them. Is it to do with the boost that makes them pop off?

one day boost will be mine!

On 10th Mar, 2012 Joe C said:
TBH peple stick it everywhere... and theres merits to each...


wil_h

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8444 Posts
Member #: 123
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Betwix Harrogate and York

The circlips have always been a problem, boost or no boost. It's high revs that make them fail then funk your bores.

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.


apbellamy

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I helped keep this site alive!

15587 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

Would these been any good for a turbo 1098?

http://www.ebay.co.uk/itm/290669260045

*hehe!*

On 4th Apr, 2014 oli79 said:
I miss wr london *crying*

On 30th May, 2014 lee.pb said:
when pulling it in the garage.

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