The
Stag engine rebuild is now complete, the engine is back in the car,
has been run to temperature a few times, tuned and road tested. All
that remains is for the owner to reclaim his prize possession at the
weekend.
We
seem to have a plethora of six cylinder engine work underway at
present. The first is a TR5 unit which is being fully rebuilt to more
or less standard spec but with an unleaded head and balanced bottom
end, following an unfortunate incident when last used on a touring
trip to Europe. This would seem to have been caused by a prolonged
period of detonation – have a look at the piston!
The
second one is a Vitesse mark two which the owner wishes to have the
cylinder head somewhat ‘breathed upon’ to increase power output
particularly in the mid-range and to generally optimise efficiency
and improve gas flow by fitting different sized valves and cleaning
up the ports and throats. We will also fairly obviously be converting
this one to run on unleaded fuel – it would be silly not to at this
stage.
The
third one is a 2500 carburettor engine intended for a 2000 saloon,
which is being built to a recipe which I have successfully used many
times now. This is designed to maximise the torque of these units
whilst improving the breathing and top end performance with twin 1¾
inch SU HS6 carbs on the longer 2500S inlet manifold, a custom
camshaft, different valves, a little head work and a balanced bottom
end. This recipe usually delivers around 140 bhp or so with a good
spread of torque and a lovely smooth free-revving engine which is
still perfectly tractable in traffic and not too heavy on fuel. As
such it seems to be about the best compromise I have come across for
road use with a good performance.
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