Why should I do that??
It worked as it is (as it was done by the factory) for 50 years with my car
and all others, so it will work another 30 years of my live!
If I want it different I would buy a new aluminium head.
Josef Eckert
Konigswinter/Germany
-----Urspr|ngliche Nachricht-----
Von: healeys-bounces at autox.team.net [mailto:healeys-bounces at
autox.team.net] Im
Auftrag von PG
Gesendet: Donnerstag, 22. September 2011 00:40
An: 'Bob Spidell'; warthodson at aol.com
Cc: ardmorebusiness at xtra.co.nz; healeys at autox.team.net
Betreff: Re: [Healeys] cylinder head questions
You mill out the plug hole from the outside so that the sparkplug goes deeper
into the cylinder and the spark gap is not shrouded.......ideally you then
index the plug to face the chamber....the milling is about .25"
My machine shop was initially nervous about doing it as he was worried about
the remaining strength.
Paul
-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at
autox.team.net]
On Behalf Of Bob Spidell
Sent: Wednesday, September 21, 2011 8:08 AM
To: warthodson at aol.com
Cc: ardmorebusiness at xtra.co.nz; healeys at autox.team.net
Subject: Re: [Healeys] cylinder head questions
I couldn't get from Chris' page what the 'solution' is; mill out the plug
hole, or the inside of the chamber?
Bob
--------------------------------
Bob Spidell - San Jose, CA
----- Original Message -----
Chris & Mark,
Thanks for the information. I checked my two 960 heads & they both have the
plugs recessed in the combustion chamber as per Chris' information &
photographs.
If this is a machining mistake it is still a mystery why they never corrected
it. And why the BJ8 is the only model a greater advance.
Gary
Chris and Gary,
also have an original works head. It too has the AEC 721 number ast into the
top.
s an aside, I was told long ago that the heads were made 'after ours' when
production had stopped for the day. They were apparently ade from recycled
diff. heads that had been melted down.
've not done a side-by-side comparison of the 721 and the 960 or lue-printed
either of them, but I have been told that there is also a light difference in
the squish area in the heads, the 721 being onsidered the better designed one.
ne of our racers here in NZ actually replaced the 960 on his BJ8 with he 721.
He reckoned it gave him a marginal improvement in erformance. I don't know how
scientific his analysis was . . . that as back in the 70s.
Cheers
ark Donaldson
uckland. NZ
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