quelques essais de pots (à compléter)

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

Polini 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

Simonini 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 available

Zirri 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 class! 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. Price: 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

TFF PM 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 DM?

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.
GREEN:
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
it.


BLUE: Leo Vinci
RED: Kegra