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Supplemental Oil Lines
By Bob Jones
When you look over the engine bay of any TR6 racer you will notice one
thing all of them have in common - the installation of an oil line from
the block to the cylinder head to provide extra flow to the rocker arms.
This seems to work on the six cylinder engines as the stock flow is not
sufficient to prevent rocker arm wear over the long run. However, what's
good for the goose, is not always good for the gander. It has been
reported that these same oil lines, when installed on TR4s, can lead to
extremely high oil use and poor performance. It seems that too much oil
is sent to the cylinder head which has to return by gravity down push
rod holes to the oil pan.
All the while the crankcase gasses are coming up these same holes to get
sucked through the emission valve and go to the intake manifold. This is
worse when the vacuum is low as the emission valve is open and the
crankcase pressure is high. So you may wish to reconsider installing
this auxillary oil line in your four cylinder Triumph engine unless the
hose (with a restricted flow) is specifically sized for these motors.
The above was taken from the tech tips on the Temple Of Triumph web site.
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