[Healeys] The AEC960 Healey 3000 Cylinder Head spark plug seat and timing issue

[Chris Dimmock]

Hi Kees,
No the plug can't be hit by a flat top piston in a westlake design  
cylinder head unless the electrode is below the head face. Ie the head  
face is shaved very excessively.
A round flat top piston doesn't  generally go into the heart shaped  
westlake combustion chamber unless some else has broken!!
We machined around 100 thou off the spark plug seats 12 years ago on  
my BJ8
chris

Sent from my iPhone

On 05/10/2010, at 8:11 PM, Oudesluys <coudesluijs at chello.nl> wrote:

> Chris,
> The plug concerned seems to be fitted more upright that the other  
> two. If you machine the recess on the outside and the plug would sit  
> deeper may be the plug can be hit by the piston?
> Perhaps it may be better to remove some material and shape the area  
> around the plug nose in a smooth cone.
> Ok, you will loose some compression but gain in flame front.
> Kees Oudesluijs
> NL
> <coudesluijs.vcf>