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Home > How To > Enlarging head chambers to lower CR

Paulham

55 Posts
Member #: 9654
Advanced Member

NW London

Hi,

Does anyone know of a guide of enlarging the chambers on a standard 998 head to lower the CR?

I've searched online but haven't had much luck, maybe I'm using the wrong keywords/terminology?

Paul


Vegard

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7749 Posts
Member #: 74
I pick holes in everything..

Chief ancient post excavator

Norway

Buy David Vizard's book, Tuning the A series engine. That'll get you going.

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.



Paulham

55 Posts
Member #: 9654
Advanced Member

NW London

I have done already, although not had the time to sit down and concentrate.

So your saying the details are outlined in the book?

Paul


Will

162 Posts
Member #: 11091
Advanced Member

Urmm having difficulty on finding this info out myself
Don't have the yellow bible myself but any basic pointers for a complete novice?
Or does anyone know anyone that enlarges the chambers on my cylinder head?


Joe C

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12172 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

easiest and best thing is to send it to someone, TurboPhil and Benross on here both do good head work and at good prices too. ball park your probably looking at 100 quid to get the chambers done.

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/



Turbo Phil

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4378 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

What casting are you working with ?
The Vizard book shows you where to remove material in reference to valve size. What kind of volume do you need ?
Phil.

WWW.TURBO-MINI.COM


Rammie2000

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1657 Posts
Member #: 10190
Post Whore

belgium

Its in there. Just a bit complicated becaus he shows the different things with different valve suzes on 1 drowing. But once you get it piece of cake. I use a dremmel few years of my life becaus of the dust and 3 to 4 hours a chambre... really... if you arent in a shitty land where everzthing seems to be costing more then gold like i am... just get it done by a pro.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Turbo Phil

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4378 Posts
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My sister is so fit I won't show anyone her picture

Lake District

Hats of to you Rammie. That's determination, 3-4 hours a chamber with a dremel !! Wow.

Phil.

WWW.TURBO-MINI.COM


Joe C

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12172 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

get a router and a carbide bit FFS!

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/



Will

162 Posts
Member #: 11091
Advanced Member

I've sent benross a message, I think rammie is right
No skill + no tools + no guide = go pro!


Rammie2000

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1657 Posts
Member #: 10190
Post Whore

belgium


yes on a na 998 head. im doing the turbo been 6to 7 hours now to get it big enough ( on first chamber) pics on here somewhere. its based on how your avatar looks. so aprox 24 hours to do the whole head but if getting it done here would cost me 500 euro at least. not rich but if i want it i go for it... hahaha

On 9th Jan, 2017 Turbo Phil said:
Hats of to you Rammie. That's determination, 3-4 hours a chamber with a dremel !! Wow.

Phil.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Turbo Phil

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4378 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

If you don't have access to a compressor/die grinder you'd be better off getting a cheap flexible shaft for a drill, though no ideal, with proper carbide bits it would still be much quicker/easier than with a dremel.

Phil.

Edited by Turbo Phil on 9th Jan, 2017.

WWW.TURBO-MINI.COM


Jamester101

2 Posts
Member #: 11517
Junior Member

Hi Phil - you website seems to be down, will it be up again? It's my bible at the mo *smiley*


Turbo Phil

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4378 Posts
Member #: 20
My sister is so fit I won't show anyone her picture

Lake District

Yes, eventually. It's getting reworked, but other things are taking priority at the moment.

Phil.

WWW.TURBO-MINI.COM


Jamester101

2 Posts
Member #: 11517
Junior Member

Ok - great, it's a project that will probably take a year or 2, I'm hoping to build a 1275 turbo using the principles you describe. at some point I will probably be coming to you for some head work etc

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