6 replies to this topic

[Shooter63]

Hopefully some of you race guys on here can throw a bit of light on this for me, there is a Miglia cylinder head on the bay at the moment and it's making strong money so far, the thing that made me look and scratch my head is the chamber shape, it looks like it has no squish area, as in the chamber seems to be machined right to the gasket line everywhere. It also has a 27cc chamber, can someone explain to me the idea behind it.

Cheers

Shooter

[whistler]

This may not apply but my 1098 build uses flat top pistons and the block skimmed to within 5 thou of piston top. Keith Calver built the cylinder head with a specified CR in mind and the combustion chambers ended up as 28.8cc. It may be that a Miglia engine is built using a similar method so the combustion occurs in a larger chamber. Maybe I'm wrong.

 

I have a spare 12G940 'stage 3' head with 36x31 valves and a chamber of just over 25cc. Could be the same reason if flat tops are fitted.

[Shooter63]

My present build is similar with flushed pistons etc, it's the lack of a squish band/area that's getting me, I was wondering if those sneaky pro engine builders have come up with a new idea leaving us amateurs in the dark.

Shooter

[nicklouse]

Can you get a picture. Or link.

[imack]

Auction has ended, but this is the one.
https://www.ebay.co....emis&media=COPY

[nicklouse]

He has another on Facebook. Both MED and KAD are doing heads like this. 
 

here is a question for you. 
 

what pistons would you run with it?

[imack]

Miglia short motor on KAD's fb page with flat top pistons and zero deck height.
Hadn't realised flat top 1293 - 1380 pistons were available. Must be an advantage if you can get the required cc in the head

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Edited by imack, 24 October 2023 - 07:04 PM.