[Healeys] External differences of six cylinder engines
austin.healey at gmail.com
Mon Jun 7 05:12:27 MDT 2010
Hi Richard & Josef,
Ok. My Bj8 head is also AEC 960.
I thought (obviously incorrectly) that the AEC 960 was specific to the
My comment about the ignition timing on a BJ8 was the reason I thought
the AEC 960 casting was specific to the BJ8. Ive only seen the BJ8
spark plug seat depth issue on AEC 960 heads from BJ8s.
Let me do some more research and I'll post the results. I suspect the
BJ8 issue is a machining issue, rather than a casting issue.
Sent from my iPhone
On 07/06/2010, at 12:44 PM, richard mayor <mayorrichard at hotmail.com>
> Sorry Chris. I just checked the number on my BJ8 cylinder head. It
> is AEC 960. If it were different than earlier 3000 heads, it would
> have a different part number. It is the same as earlier heads. The
> BJ8s had a new cam with more overlap than any of the earlier cams. I
> suspect this is the reason for a different ignition advance spec.
> Richard Mayor
> > From: Josef.Eckert at t-systems.com
> > To: austin.healey at gmail.com; Healeys at autox.team.net
> > Date: Sun, 6 Jun 2010 13:50:21 +0200
> > Subject: [Healeys] External differences of six cylinder engines
> > Hi Chris,
> > here I am not with you. All 3000 heads are the same casting,
> casting number
> > AEC 960, except the early ones with the opening for the thermo
> choke sensor.
> > Josef Eckert
> > -----Urspr|ngliche Nachricht-----
> > Von: Chris Dimmock [mailto:austin.healey at gmail.com]
> > Gesendet: Sonntag, 6. Juni 2010 12:19
> > An: Eckert, Josef
> > Cc: <Healeys at autox.team.net>
> > Betreff: Re: AW: [Healeys] External differences of six cylinder
> > Hi Josef,
> > Happy to be corrected, but I'm not understanding the differences
> you cite.
> > I've seen 2 different 12port head castings - as i said, the area
> around the
> > thermostat/ temp sensor.
> > The BJ8 head is different to all the earlier 12 port heads.
> > The unseen difference is the BJ8 head spark plug seat is too far
> away from the
> > combustion chamber, by over 100 thou.
> > That's why a BJ8 has vastly different ignition timing to any other
> 3 litre
> > Healey engine.
> > Look at the ignition specs.
> > Bj8 heads are different. Not sure of your other 2 points
> > Chris
> > On 06/06/2010, at 5:19 PM, <Josef.Eckert at t-systems.com> wrote:
> > > Chris,
> > > I need to correct you. There are 3 different 12 port head
> > > 1 The early one without the "nose" for the late 100/6s
> > > 2 The one for the Thermo-Choke on early 3000s
> > > 3 The "nose" one following the Thermo-Choke one on 3000 Mk1 to Mk3
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