[Healeys] External differences of six cylinder engines

[richard mayor]

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
BN7L-466  Vintage Racer
Portland, Oregon




> 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 engines
>
> 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
>
> Sent from my iPhone
>
> 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 castings.
> > 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.
> >
> > Josef Eckert
> > Konigswinter/Germany
> >
> > -----Urspr|ngliche Nachricht-----
> > Von: healeys-bounces at autox.team.net [mailto:healeys-
> > bounces at autox.team.net] Im Auftrag von Chris Dimmock
> > Gesendet: Sonntag, 6. Juni 2010 04:17
> > An: Derek Job
> > Cc: Forum
> > Betreff: Re: [Healeys] External differences of six cylinder engines
> >
> > T

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