Exhaust BGM PRO Big Box Touring – “BBT V2”
The BBT V2 is a further development of the well-known Big Box Touring exhaust system. During the revision, we attached great importance to depicting the widest possible spectrum of usable engine concepts.
Our prototype was driven more than 3000km to ensure that the final product delivers what it promises.
It was driven on an original (unprocessed) Rally200 Femsatronic block with standard shaft and Malossi 210 Sport as it comes out of the box.
In our tests, the engine developed just over 17 hp. Due to the higher performance and the higher torque, a straight-toothed 23/63 BGM primary is installed (3% longer than standard). The base plate of the Femsatronic was reworked to a long hole in order to be able to adjust the pre-ignition from a fixed 24° before TDC to 18° before TDC. The squish edge as specified by Malossi with 0.9mm and the air filter without drilling / processing.
Sitting upright on the Autobahn, the scooter runs at a reproducible speed of 120 km/h (according to GPS), corresponding to 7000 rpm with an additional 16 hp on the wheel.
In this graph we show the BBT2 (blue) compared to a Polini Box (red), measured in third gear:
The manifold, the contour of the exhaust shells, the damper chamber and the selectable diameter of the tailpipe are the changes made in detail.
The manifold itself has been modified in the course and to increase performance and the new exhaust shells have been optimized for more ground clearance.
In the damper chamber we have added components to achieve further turning and an increase in torque. The tailpipe can be adapted to the displacement and the speed of the respective engine by removing a plug-in part.
The tailpipe with plug-in part (d=18mm) is suitable for touring-oriented engines such as e.g Malossi Sports, Polini 210/211 and Quattrini 232
After removing the plug-in part, the new BBT has a tailpipe diameter of 20mm Quattrini 244-252 and Malossi MHR very good and also offers significantly more power and speed without thermally influencing the engines too much.
In summary, the BBT V2 achieves more across the entire speed range than the previous version on current engine concepts.
In addition to my everyday driving device, Maryzabel's Platonika also had to be used for experiments.
You can read about the exact equipment of the Platonika with our bgm177 cylinder here in the blog link to blog:
Here is the comparison on the engine of the Platonika:
My daily ride, equipped with a Malossi Sport 210, Set primary incl. clutch, Clutch pinion
+ primary + repkit and via a membrane with a YSN30 carburettor link to blog: carburetor YSN30 https://blog.scooter-center.com/fast-30-mm/ )
ventilated, this engine represents a drive machine of the current generation.
Changed course - the manifold runs closer to the exhaust body and is additionally supported with a strut
Depending on the engine concept, the plug-in part can be pulled out
The BBTV2 is available now for the PX80, PX125, PX150 and the like, as well as the PX200 and Rally200: https://www.scooter-center.com/de/search?sSearch=bbt2
