Roger Los has an XJ6 as well as an E-type and was asking on the XJ
forum about the Strangleberg setup those cars were inflicted with
instead of twin 2’’ SUs in the rest of the world.
It reminded me I’m not sure if I’ve read, or mentioned myself, the
dead easy partial fix I’ve done on two of my own Federal E-types.
I’ve read lots about removing the throttle plates, removing
everything and plugging the holes etc but don’t recall this ultra-
quick reversible option. Apologies if it has already been covered
but here’s the XJ post repeated:
''One trick I’ve done on a couple of Federal E-types which may work
on the XJ6 Strangleberg set-up takes five minutes and gives you 85%
of the benefit of removal.
The ‘Crespin mod’(?) just needs you to disconnect the secondary
throttle link at the carb end and leave it dangling attached to the
secondary plate quadrant. The secondary throttle plate (on E-types
at least) is spring-loaded to close. If you wriggle the link
around, you can jam it against the engine side of the manifold (for
which you need to open the secondary plate to make room) and the
return spring holds it tight against the manifold.
In doing so. the secondary closes a very slight amount, so it’s not
as good as complete removal, although it does jam the secondary
almost totally open. It therefore eliminates the major obstruction
that causes the mixture to divert at lower revs and messes up gas
flow at medium revs too. It also avoids all possible secondary
throttle mis-timing (which is pretty common), be it from
maladjustment or due to incorrect carb spacer thickness that messes
up the opening geometry.
Offered in case it helps you overcome those terrible power-sapping
intake arrangements Jag were forced to inflict on you. Doing it by
sleeving, or total removal and plugging is better, but you have to
love that five-minute timescale as an interim step. Many will
settle for it as final choice.’’
1E75339 66 D, 1E33100 66 FHC, 1R7977 69 OTS, 1R9720 69OTS
Gaithersburg (in transit), United States
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