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Home > 998cc > Advice on 998 Turbo please

garethlloyd

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282 Posts
Member #: 616
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Birmingham

30th Oct, 2005 at 05:20:50pm

Hello all,

I would like some advice please.

I quite like the idea of having a 998 turbo. I think Ive got the gist of whats needed for the conversion but any help would be apreciated.

I think I need...
1. 12g295 unskimmed to keep the CR down?

2. Mirage manifold kit so I dont have to cut the bulkhead

3. T2 turbo off a R5?

4. Special turbo fuel pump (does this differ from a regular electric fuel pump?

5. Fuel regulator

6. Fuel tank with return and suitable sized fuel pipes?

7. Turbo HIF44 with plenum and inlet?

I want to bolt this lot to my late 998cc good condition A+ engine. I would like to start by keeping it relativly simple and run fairly low boost? Can I do the above and keep the engine internals standard for the time being?(assuming they are in good condition and the engine is of fairly low mileage?

Will have thought that the clutch my need uprating?


Any input would be greatfully recieved I would like as much info as possible before considering it further.

Many Thanks

Gaz

Mod Edit: Moved to correct section

Edited by AlexB on 7th Nov, 2005.


Dangerous

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2521 Posts
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Swindon

30th Oct, 2005 at 07:47:18pm

Turbo dizzy/or mod yours or mega jolt etc


Metro turbo weekend driver,Mini turbo in the making again!



Tom Fenton
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15300 Posts
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

30th Oct, 2005 at 08:40:07pm

There has been loads and loads and loads of threads and discussion on this subject, use the search button and read back through all the old posts.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


Like fuel 😂😂

wil_h

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9258 Posts
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Betwix Harrogate and York

31st Oct, 2005 at 08:30:36am

I think you're on the right lines too.

Not sure if the standard exhaust valves and guides ar up to the job (others please comment), but the clutch should handle 80 or 90 bhp I reckon.

Wil

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



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of 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.


T3Tone

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Sunny suffolk

31st Oct, 2005 at 02:52:03pm

Unskimmed head to keep compression down!! I would have it skimmed if its origin is unknown and if CR is a problem you could always have the chambers machined out to lower it.

-MINI CLUBMAN 1380 TURBO-

Tom Fenton
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15300 Posts
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

31st Oct, 2005 at 11:23:04pm

On 31/10/2005 14:52:03 T3Tone said:
Unskimmed head to keep compression down!! I would have it skimmed if its origin is unknown and if CR is a problem you could always have the chambers machined out to lower it.


A lot of the 12G295's out there have had a LOT of meat skimmed off them to allow them to be used with dished/flat top pistons. The original 998 Cooper engines they were fitted to, had raised crown pistons. Therefore, this large amount of skimming is needed to get sensible compression on an engine with flat or dished pistons.

By getting an original "unskimmed" example, you still have this volume, which is useful for CR purposes.

But as with any head, a LIGHT flash skim is always advisable to get a flat mating surface.

I think this is what was meant by the phrase unskimmed head!
*wink*


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


Like fuel 😂😂

Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

1st Nov, 2005 at 11:08:29am

Has anyone run a 12g940 head on a 998 and turboed it?

Suposedly if you run a standard cam the valve lift isn't enough to need the block pocketing.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



wil_h

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Betwix Harrogate and York

1st Nov, 2005 at 11:48:36am

Yes I run a 940 on a 998 with a turbo.

For 30 quid to get the block pocketed, it's just not worth not bothering (good double negative that).

And £15 for an MG metro (non turbo) cam is also worth spending.

Wil

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



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of 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.

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