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Home > Technical Chat > Cylinder head chamber without a beak - does it run ok?

NDT

1 Posts
Member #: 11884
Junior Member

Many years ago I took the die grinder to an MG head.
I was tying to reduce the CR as much as possible and basically ground it so there was no “beak” left at all in the chamber - it was basically like a smooth round chamber.

Anyone tried running a head like this?
What are the downsides?


Turbo Phil

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4379 Posts
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Lake District

Not ideal but it will still work. Though a shape like you describe removes all the squish band and promotes poor mixture motion at low rpm.

Phil.

WWW.TURBO-MINI.COM


dazibee

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546 Posts
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TRURO, CORNWALL

Mine still has the traditional chamber shape at 8.3:1. Thought I was the odd one out as it seems everybody else had removed the beak to get the Cr down? Avonbar told me the beak causes hot spots and potential for detonation.


robert

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uranus

i gotta beak.

Bicester scramble ,Medusa enjoyed the trip. https://www.youtube.com/watch?v=Q-7I7-nA19U


Turbo Phil

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Lake District

On the smallbore (non 295) heads I could see there being an issue as the “beak” is very pointed and they often crack from this point. On the 1275 heads the “beak” has a far larger radius. I’ve seen no issues keeping a more traditional shape in this area, in fact I’ve seen some of the best results retaining it.

Phil.

WWW.TURBO-MINI.COM


Chris.williams

7 Posts
Member #: 11881
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New Zealand

So this is not a good chamber mod?


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Turbo Phil

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4379 Posts
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My sister is so fit I won't show anyone her picture

Lake District

It’ll work just fine, is it optimum ? Probably not. It’s often a compromise in order to get the compression to a suitable level.

Phil.

WWW.TURBO-MINI.COM


monsterob

205 Posts
Member #: 11029
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Crewe

Looks like an alien that's had the probe turned onto him ........

Outside the box


slater

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Suffolk / Birmingham

Removing the beak is a bad idea yes.

The engine will still work but it's not ideal for several reasons. Swirl/squish etc. Its also completely unessicary in anything but the largest of forced induction aseries considering you can remove quite a bit of material from other places fairly easily.


Anthony30

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120 Posts
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Rainhill, Merseyside.




On 5th May, 2019 monsterob said:
Looks like an alien that's had the probe turned onto him ........
*happy*

On 18th Nov, 2014 D4VE said:
went down to my local hydraulics place and he gave me a suitable replacement larger nipple *smiley*

Home > Technical Chat > Cylinder head chamber without a beak - does it run ok?
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