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My 1000S had so far
survived five dyno runs, the first one was at
46.000km after the first modificatons took place.
Another ignition (Silent Hektik), dual-firing and
the camshaft should be mentioned as main things,
which were built in. The diference to the second one
was, that the Piranha ignition has replaced the
Silent Hektik. The "Serie" curve shows the original
power a stock LM IV engine (big valves, PHF40)
typically has. Above these curves there are two
readings, which were made just after the "big
change" with big bore 95mm kit and the 7905 camshaft
from Dynotec in the winter of 1999. The difference
between the two is only a diffent set of headers, it
is with my 48mm headers and II with the 42mm, I have
mounted at the moment.
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It is very obvious, that the
first two readings doesn't show the torque valley of
the SERIE curve, it was elminated by the camshaft
7006 from Dynotec. The very good torque behaviour in
the lower range is due to the big 48mm headers. It
is easy to recognize, that the more simple ignition
(Piranha) lose some power against the high tech
Silent Hektik. In all-day-riding you don't realize
this, you only recognize the more spontanious
response of the engine.
The black curve I did only to
see what is left after 200.000km, and you can see,
there is still a lot. It has lost upper range power,
but from the pure max. readings it has only lost
1PS/Nm, which is nearly the tolerance. Why the
202.500km curve is in the lower to mid range better
than the 70.000km curve, I can only guess. Perhaps
the Lafranconi Competitione tail pipes have an
positive effect, the only other change were the carb
sliders, which have been changed from 50 to 60.
The mountains above these
curves are the result of quite high money transfer
in the winter of 99. Both readings were done with
Lafraconi Competitione mufflers, 95mm set of pistons
and 7906 camshaft from Dynotec. The dual-firing ,
the Piranha and the airbox remained untouched. The
run I was done with my old 48mm headers, and I was
quite disappointed with the result, considering the
money input. The maximum was 91PS with 104Nm torque,
I expected more. This was only 10PS more than before
with original displacement. For testing we built in
the 42mm headers with an extra crossover, and
without any other change, the engine gained 6PS and
7Nm, which ended up in a result of 97PS at 6680
1/min and a torque of increadible 111Nm at 5420
1/min, while there are always more than 90Nm over
2500 1/min. Especially in the top range of 7000 rpm
and more, there is a difference of max. more than
10PS, which will probably help to me reach my
personal target of going in upright sitting position
8000 rpm. With the old 48mm headers it wasn't even
in the new constelation possible, to get more than
7000 rpm in final gear, I hope that changes now. By
the way, 1000 rpm are 28,6km/h, do the calculation
on your own.
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