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 quelques essais de pots (à compléter)

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RGC Geoff
RGC Geoff

Masculin Nombre de messages : 10867
Age : 48
Localisation : BZH 29 West coast quoi !
Date d'inscription : 03/02/2009

MessageSujet: quelques essais de pots (à compléter)   Jeu 7 Mai - 14:31

Test of fourteen exhausts for the Vespa PX200

From the original
German version
, at Scooter Center Colognes' Technical site (all in
German), translated by Altavista's Bablefish
(then cleaned up by Bill Donald).
Test performed by Uwe from the Scooter Centre Cologne, Uli Ernst and Dr. A.
Worbel late 1999. On the first test day were also Stefan and Friedhelm from the
Westerwald area - two real specialists in PX 200 exhaust systems. Uli had an
Amerschlaeger performance test stand.
We tested with Uwe's scooter: 210cc Malossi, original transmission, Cosa 23
tooth clutch with strengthened springs, especially built diaphragm inlet (reed
valve?) with R 350 diaphragm, 32 mm Simonini downdraft carburetor (?).
For the tests the rear wheel performance is measured!

Piaggio Original

19.4 HP @ 7080 rpm
19.6 Nm @ 6850 rpm
For its relatively small HP
performance is very torquey.
Price: approx. 110 DM

Sito plus

20.3 HP @ 6750 rpm
21.8 Nm @ 6370 rpm
More torque, in comparison
to the original Piaggio. But not much more powerful. Probably will be some
km/h faster, since between 5000 rpm and 8500 rpm it has 1 to 2 HP more
than the original Piaggio.
Price: approx. 120 DM

Kegra / JL

22.7 HP @ 7160 rpm
22.4 Nm @ 7030 rpm
The Kegra convinces neither
with performance, or with torque. Still worse however, the area of highest
performance is much too narrow a power band. It is by far the worst
English racing exhaust on the market! (if it still is)
Price: approx.
500 DM?
(I haven't seen this being sold - Bill.)

Leo Vinci

26.9 HP @ 8230 rpm
23.3 Nm @ 7960 rpm
Clearly, it winds up
quickly, almost too quickly. Its power band is also not very even. Will
not be as tractable and easy to ride as some good English systems. At low
revs does not go well. With 5500 rpm it has 13 HP (PM Evo here already has
18 HP!).
Price: approx. 130 DM


24.3 HP @ 8060 rpm
21.4 Nm @ 7930 rpm
Again a typical Italian. As
with the Leo Vinci there is good HP, however the available power is simply
too narrowly spread. Unfortunately at low revs (as with the Leo Vinci)
simply EVERYTHING is missing.
Price: approx. 120 DM


26.0 HP @ 7640 rpm
24.0 Nm @ 7500 rpm
The Simonini resembles very
much the Leo Vinci and Polini. It has the advantage that it indicates
always 2 HP more up to approximately 7600 rpm. It can be driven somewhat
easier than the Leo Vinci and Polini. Its power band is also not the
broadest. The PM Evolution is better because it a broader power band and
has more torque. Given the selection between Polini, Leo Vinci and
Simonini, the Simonini is the best choice, although all are not so good-
however for the money?
Price: approx. 180 DM

PSP 2000

23.2 HP @ 6350 rpm
27.4 Nm @ 5730 rpm
The PSP supplies torque
over a broad power band. However here the with high engine speedness and
the maximum performance lets require. Only which one can make with this
exhaust is too secondly in the third course the burner highly to drive
without to switch. It cannot do that well - more in addition. It turns
even still fewer like a Piaggio original exhaust. High rates are to hardly
expect it HP are missing there and it probably hardly such a long
translation give
Price: No longer manufactured.
No longer made
No Photo


25.4 HP @ 8310 rpm
21.9 Nm @ 8050 rpm
The curve resembles the TFF
(PM old), however unfortunately shifted 1500 rpm toward higher revs. Thus
it becomes difficult for normal traffic.
Price: approx. 270 DM?

RZ Evo LH 2000

27.2 HP @ 7500 rpm
27.0 Nm @ 6740 rpm
This exhaust and the
following RZ leave almost nothing to be desired! Absolute top
Price: approx. 530 DM

RZ Mark One Right Hand

27.9 HP @ 7850 rpm
27.5 Nm @ 6780 rpm
Super high torque! Broad
power band. Maximum performance and still all this in the correct speed
range! It was actually for a long time the secret tip among the
specialists. The looks are a matter of taste, because it is a right hand
exhaust and flows under the motor.
Price: approx. 540 DM
(SIP say the muffler can fall off after long use - Bill.)

PM Evolution

25.0 HP @ 7410 rpm
25.9 Nm @ 6405 rpm
Decent performance at
relatively small revs. Broad power band from 6000 rpm to 8000 rpm. This
power curve is exemplary (which does not mean however that it is the best
exhaust here). Here one can only say: Good selection, however still not
enough to be the best, since for that 2 to 3 HP are missing.
approx. 520 DM?

SIP Performance

27.5 HP @ 7620 rpm
26.9 Nm @ 6860 rpm
Yes! And again a direct
hit. Performance, torque, the number of revs and the width of the power
band speak for itself! The RZ Mark One right hand has the same and even
somewhat more, but the SIP is carried left instead of on the right which
makes the SIP performance a genuine alternative (not to forget the Evo
2000). The PM evolution it topped only scarcely. The SIP Performance is
made by English exhaust guru John Lomas. Made of stainless steel.

Price: approx. 540 DM. Polished 590DM

Taffspeed Mk4

29.1 HP @ 7910 rpm
26.7 Nm @ 7450 rpm
Also not bad! Despite the
high maximum performance the PM Evolution outweighs it strongly in the
power band. From 5500 rpm to 7500 rpm there nothing at all, does not go.
SIP performance and RZ Mark One right hand can be ridden better because of
their beautiful power band.
Price: approx. 630 DM


27.2 HP @ 7810 rpm
24.9 Nm @ 7520 rpm
Performance-wise higher
than the PM Evolution. But also here the number of revs are somewhat too
high and the power band unfortunately not as broad as it should be. The
curve resembles the SIP performance. Unfortunately shifted almost exactly
1300 rpm to towards higher revs. That makes it no longer easy to ride. PM
learned from it and developed the PM Evolution.
Price: approx. 550

Here are the max. torque and the max. performance in tabular form.
The higher the torque in comparison to the performance the easier the scooter
can be ridden. Note - easy riding, not fast driving! One cannot have both. One
must always find a compromise between performance and torque.

And here are some interesting comparisons:

LIGHT BLUE: Taffspeed Mk4
DARKBLUE: RZ Mark One right hand

PINK: SIP performance
RED: PM evolution
GREEN: Kegra

The Taffspeed Mk4 in its 3 variations.
RED: With pitot tube
and pilot disk. 29.1 HP @ 7910 rpm and 26.7 Nm @ 7450 rpm.
BLUE: With pitot
tube however without disk. 26.6 HP @ 7510 rpm and 25.9 Nm @ 7070 rpm.
Without pitot tube and therefore naturally also without pilot disk. 26.6 HP @
7630 rpm and 24.8 Nm @ 7350 rpm.
Thus: Leave the Taffspeed as you buy

BLUE: Leo Vinci
RED: Kegra

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