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About 75% of the power in your engine
comes from the cylinder head. In money terms, you get more B.H.P. from
developing your head than any other other part of your machine. In other
words, if you are looking for more performance cheaply, your head is the
place to spend it on. You'll get the best
return. Astonishingly, most head parts - even in
the 90s - are still in a relatively low state of development. This is
caused by the demands and liabilities of mass marketing, mass production
line finishing and the need to please the company accountants before
company engineers. |  |
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Surprisingly, proper parts cost little
more than second best.
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Our Nucleus
Sports Elite stainless steel valves and copper-silicon-nickel Nucleus
Power guides are the best available stainless steel valves on the
market. These are designed with the benefit of 25 years experience of
working on virtually all models, of all makes of motorcycle and with all
other aftermarket manufacturer's replacement and performance parts.
Nucleus parts benefit from individual features drawn from many sources,
including racing, aviation and long distance trucking, and are
manufactured and hand finished to the highest currently possible
standards.
Close inspection of Nucleus Sports Elite valves reveals
interesting and unique refinements over standard designs. Narrow waisted
inlet valves to allow more flow, anti-reversion lips on exhausts. Flame
paths on fire faces for combustion chambers with poor ignition features,
subtle angle changes to allow combusting gases to roll over. Multi-angle
surfaces to widen the spray of mix into the the chamber and direct gases
away. Lightening where possible but not to the deficit of compression
levels. These and others are what separate Nucleus products from the
rest. They are made from a high chromium 21-4N stainless steel manganese austinetic alloy, to
BS 970 349S52. A superior steel from
that used by the majority of manufacturers even of stainless valves.
They are matt black Tuffride finished to 72 RC Rockwell hardness where
standard valves are at about 35 RC and forged in one-piece not friction
welded in two. Where as 99% of producers use only stainless steel for
the exhaust and another cheaper metal for the inlet, we use the same
quality for both. |
Two piece
valves increase the risk of dropping a valve head at high rpm. Again,
one metal is chosen for the stem and another for the head usually for
commercial reasons of economy. The two welded are together before
machining. The steel we use is chosen for its wear resistance and heat
dispersing capabilities and is superior for both
purposes.
This section is under development and as
it grows we will focus on individual design improvements and how they
improve your engine's performance. The Cylinder Head Shop undertakes
development work design and manufacture of small batches of valves for
individuals and owner clubs. For inquiries regarding R&D and
development or for any general questions, please contact Len Paterson as
below.
