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Past Meeting

John Watkinson - Engine Secrets Revealed

XK six cylinder engine
XK six cylinder engine
Johns non-technical talk was about the fundamentals of engine design such as:
combustion chamber shape
valve size
piston size
balance,

illustrated by contrasting three Jaguar engines:
the 1948 XK six cylinder (hemi-head)
the 1971 V12 (flat-head)
the 1984 AJ6 six cylinder (pent-roof)

The general principles are equally applicable to engines from Bentley, Aston Martin and others.


AJ16 pent head combustion chamber
The AJ16 cylinder head
showing the four valve layout
and the "pent" combustion chamber
AJ16 angled valves
Reverse of the AJ16 cylinder head
showing valves arranged at an angle
V12 engine
A V12 engine in a Jaguar XJ-S

John Watkinson

John Watkinson is a Chartered Engineer who has written on a wide range of subjects including helicopters, HDTV and automotive electrics.

He owns a standard 1979 Jaguar XJ-S V12 and a much-modified 1984 XJ-S straight six.



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Date:14 April 2016

Place:Chemistry Research Laboratory (CRL), South Parks Rd, Oxford, OX13TA

Sqn. Ldr. A. Garretts MBE (retd) - The Berlin Air Lift 1948-1949

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Cars to the Claydons - 70 ml run

Date:3rd September 2016

Place:OX18 4JP

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Blackthorn Classic Car Show

Date:4th September 2016

Place:OX25 1TG

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