On a four cylinder engine it is called the rule of 9. On a six it is
the rule of 13. It is based on the fact that in-line engines are
symmetrical front to rear about the center of the block. (I think there
are some exceptions to this rule, but not in Healeys.) That is to say
that the first and last cylinders always run 180 degrees out from one
another, so that the #1 valve will always be closed when the #8 valve
(4 cylinder) is open. Just add four digits for each additional pair of
cylinders. This doesn't work for five cylinders, however, because they
are just strange.
Bill Lawrence
On Jul 6, 2004, at 6:16 AM, Michael Salter wrote:
> Like the "B" but for a 6 cyl.
> #1 with #12 valve open
> #2 with #11 valve open
> #3 with #10 valve open etc. etc...
>
> Michael Salter
> www.precisionsportscar.com
>
>
>
> -----Original Message-----
> From: owner-healeys@autox.team.net
> [mailto:owner-healeys@autox.team.net]
> On Behalf Of reasterby@comcast.net
> Sent: Tuesday, July 06, 2004 8:23 AM
> To: healeys@autox.team.net
> Subject: Valve Adjustment
>
> Should you adjust both the intake & exhaust valve clearance when the
> piston is TDC on the compresssion stroke or is there a sequence like on
> the "B" series engines ( do #1 & #8 = 9 ). '67 BJ8 2.9
> liter..........Thanks
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