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Lambretta Auspuff Test Big Box Reso Rennauspuff

Lambretta exhaust test expansion chamber v. BigBox Clubman

Lambretta expansion chamber and big box Clubman prototype test

Lambretta exhaust test, while the new and upcoming Lambretta Big Box is currently in production. Unfortunately, a delivery date is still unknown.

Lambretta exhausts onthe dyno

Before we have send the final sample to Spain, we put the new box through its paces. Additionally we have another prototype box from our friend Chalky from Replay Scooters and JPP on the dyno:

bgm PRO BigBox Proto
JPP Box Proto

The following expansion chambers competed against the boxes:

the TSR Evo,
the JL3 and
in MB3

And all three reso systems did better against the boxes than we would have expected!

The Lambretta engine

The test engine was constructed as follows:

Cylinder: RT225 cylinder converted to reed valve (BGM2225NR)
Crankshaft: bgm PRO 110/60 (BGM11060N)
Ignition: bgm PRO electronic AC ign ition (BGM210900KT)
Carburettor Dellorto PHBH 30
Intake manifold: MBD with 6-flap reed valve (7672617KT)
Clutch: bgm PRO 6-plate clutch (BGM8011NR46)

Results & conclusion of the test

Nice and clear to see how well the box scores right from the start not only with power but also with plenty of torque compared to the ‘racing exhausts’.

That’s what makes the bgm PRO boxes so nice to drive. There is always enough power available without having to struggle with gear connection problems or having to twist the throttle like crazy to get things moving. The moderate consumption values of the engine concepts with the bgm boxes are another advantage, apart from the original appearance and pleasant sound level. Another outstanding feature is the registered-design of the mounting system with adjustment options in both horizontal and vertical directions. This allows tolerances and, above all, spacers used for different strokes and connecting rod lengths to be compensated for.

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Auspuff Test auf dem Scooter Center Leisungsprüfstand

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Lambretta Exhaust Test

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Lambretta exhaust test performance diagrams

Here you can find the performance diagrams as PDF:

17/12/2020/by Heiko Lepke

Auspuff Vespa PK 50 bgm PRO BigBox TOURING

New exhaust Vespa PK50 & PK125 racing exhaust BigBox TOURING bgm PRO

Smallframe, Vespa

NEW: Exhaust bgm PRO BigBox TOURING for Vespa PK50 & PK125

Quite secretly a new racing exhaust for Vespa PK has crept into our shop. Today we present the new Vespa PK exhaust from bgm PRO.

Vespa PK Rennauspuff - bgm PRO BigBox Vespa PK | HANDMADE in EUROPE

Watch this video on YouTube

We have two versions:

for Vespa PK50 & PK80 | BGM1050PK
Exhaust -BGM PRO BigBox TOURING PK- Vespa PK50, PK80 (S/XL/XL2/HP/SS/Lusso)
for Vespa PK125 & PK75 | BGM1125PK
Exhaust -BGM PRO BigBox TOURING PK- Vespa PK125 (S/XL/XL2/ETS), Motovespa PK75 (S/XL/Junior)

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The history of this exhaust system lies in the fact that there were no original Piaggio exhaust systems for the PK 50 models. During the development of a new exhaust we recognized the potential and were able to develop a sport exhaust with original optics, low noise level and a significant increase in performance. The bgm PRO quality exhaust is now handmade in Europe and is available immediately: bgm PRO BigBox TOURING Vespa PK

bgm PRO BigBox Touring VS Sito PLUS

On the dynamometer it looks like this:

bgm PRO BigBox for your Vespa PK

Vespa PK exhaust with more power, discreet look & low noise

The bgm PRO exhaust in the TOURING version thus provides the discreet look and acoustics of an original Vespa exhaust, combined with a sports exhaust characteristic with high torque and wide power band. This system was originally designed as a replacement for the original Piaggio exhaust systems, which are no longer available. In the meantime we have developed it to a full-fledged, modern sport exhaust system.

We attached great importance to a good performance with a discreet noise level as well as a good fit.

Significantly more power
Quiet racing exhaust
Good fit
Original optics
High and early torque
Wide speed range
More final speed
Very unobtrusive
Fits without modifications
Handmade in Europe

The bgm PRO Sport TOURING harmonizes very well with a standard engine as well as with the classic tuning cylinders like the

Polini 75-112,
DR75-102 or
Malossi 75-112
Polini 133

Easy mounting

The relatively far down split manifold allows a quick disassembly of the exhaust body without having to loosen the manifold on the cylinder. The connection is secured by tension springs in a stable but quickly detachable way.

For safety reasons we recommend to start with 2-4 numbers more than a standard exhaust.

SCOPE OF DELIVERY

Exhaust body
Exhaust manifold
Exhaust Springs
Cylinder/ manifold gasket

Vespa PK Exhaust TIP:

Adjust spraying, see above.
Some heat-resistant sealing compound (see accessories for the exhaust) between manifold and exhaust body keeps this area permanently clean.

Exhaust PK 50: Matching Vespa PK

The PK exhaust fits the following Vespa PK 50 and Vespa PK 80 models:

Exhaust PK 125: Matching Vespa PK

The PK exhaust fits the following Vespa PK 125 and Vespa PK 75 models:

Order here: modern Vespa PK exhaust

30/06/2020/by Heiko Lepke

Vespa touring exhaust BGM PRO BigBox TOURING Vespa 200cc

News, Pr?fstand, Vespa

New Vespa touring exhaust

We received the first production pattern of the BigBox Touring for 200cc Vespa PX engines today.

Assessing looks and fit are part of a normal sample exam. And so are test runs on our Scooter Center P4 dynamometer.

We already mentioned in previous entries relating to this Vespa exhaust, that the BigBox Touring has a drastically smaller U-bend than the BigBox Sport, its larger sister.

The missing black, heat-resistant cover layer makes the BigBox Touring look somewhat naked. We also attach significance to closely assessing all the joints without the cover layer, though.

Test assembly on a Vespa Sprint with a 200cc engine

One of the first parts of the exam was the assembly in a Vespa VLB (Sprint). Usually space issues arise, when fitted in combination with a 200cc PX-engine. Especially around the centre stand, in particular in the “U’s” and the laps for the stand springs. Depending on the assembly of the exhaust, stand feed rubbers might collide with the U-bend.

We especially focused on these narrow spaces to see whether everything fits. The BigBox fits even to vehicles with a two-spring-system at the centre stand, which has only be introduced to the German market. The stand feed rubbers have a save distance to the hot U-bend.

Just as its larger sister the BigBox Touring comes with a solid clamping and additional holders for exhaust springs.

You want to play it safe? Our retaining plate incl. exhaust springs perfectly matches your BigBox.

Performance measurement Vespa exhaust

Once we agree with the looks, processing and fitting we continue with performance measurements.

First “testing victim” is a cast iron Polini with 207cc, SI24 carburetor in a standard Vespa PX200 engine.

Early torque for day to day use and touring

When developing the BigBox Touring we focused on having the possible torque available early and that there is a high amount of pressure in the exhaust with low revs.

The earlier and more homogeneous torque is provided by the engine, the nicer is a day to day drive. Our cast iron test engine by Polini with a BigBox touring reaches more than 18Nm at 3900rpm. Translated to the 4th gear this means smooth cruising at 50km/h with a very good potential to accelerate up to the final revs.

Increased transmission possible

Depending on the engine you fit the BigBox Touring on, an increased primary transmission can be used reasonably to go easy on revs while retaining the same cruising speed. Increasing transmission is easiest when using a clutch sprocket. The BGM clutch sprocket for Cosa clutches or a sustainable solution like our BGM Superstrong clutch are very fitting examples. An increased transmission may increase the top speed by 5km/h at same revs.

Let’s test – BigBox Touring is waiting for you!

You want to know what the Vespa Touring exhaust BGM PRO BigBox Touring can do to your personal engine? Just send us a date inquiry to

pruefstand@scooter-center.com

Our test pattern is waiting for you on our dynamometer.

26/05/2015/0 Comments/by Jenny Haas

Available again: BGM PRO BigBox SPORT Vespa PX200 Vespa Rally200 exhaust

Vespa

Since yesterday, the BigBox Sport for Vespa PX 200 is also available again

Shelves were quickly empty, due to the immense success and demand of our Vespa racing exhaust. But we stocked up and since yesterday the BGM PRO BigBox Sport exhaust is available again for Vespa PX200 and Vespa PX 80 – 150.