Home1st - 2015 BSA Bantam Championship
Over the years we have had a number of riders win the BSA Bantam Championship using Torqsoft designed pipes.
2016 - 1st Mike Powell
First long stroke 125 cc engine to win championship in 39 years
Improve the performance of your two-stroke engine with a TorqSoft designed exhaust system. We shall send you a pdf document with the templates for manufacturing your exhaust. So whether you have a 50cc road bike, a 500cc motocrosser or a classic racer, we will design the perfect exhaust system for you.
Your new performance exhaust shall be designed and your pdf document emailed to you within 48hrs after filling in the form below with your engine details and the payment of 55 euro via either paypal or credit card.
Example
For our design example we are going to design an exhaust system for a 50cc Minarelli AM6 engine. This water cooled, reed induction engine is used in a variety of 50cc production road bikes such as the Aprilia RS50, Yamaha TZR 50 and the Rieju. Our example has an after market 50cc performance cylinder with a bridged exhaust port.
In the design form first select the water cooled and reed induction options from the dropdown menu's. This cylinder has two exhaust ports and five transfer ports so enter 2 in the No. Exhaust Ports input box and enter 5 in the No. Transfer Ports input box.
Next enter the dimension for the exhaust port. This is the length from the piston face to the end of the exhaust flange. The diameter is the internal diameter of the exhaust flange. In this example the dimensions are 45mm and 27mm respectively.
Next enter the cylinder bore and stroke which are 40.3mm for the bore and 39.0mm for the stroke.
Finally, enter the exhaust duration of 184deg and the peak power speed of 12500 revs/min and click the Design Now button.
Check your input data and click the paypal button. Note that you do not require a paypal account as you can use your credit card.
On receipt of your engine details, we will design an exhaust system and create a pdf document with all the templates required to fabricate your pipe - as shown below. This pdf document will then be emailed to yourself. Click on the image below to open a sample exhaust design pdf file.
Success Stories
50cc Cobra Motocrosser
First time out with his new Torqsoft designed exhaust system fitted to his 2006 cobra and 8 yrs old Simon scores a hat-trick of wins - his first ever. Indeed with only one race to go in the 2011 championship series, Simon has an 100% win rate.
BSA Bantam Road Racer
After a very competitive 2010 British BSA Bantam Championship, it went to the wire with three riders in contention at the last race - Cadwell Park. Pete Tibbitts emerged victorious with his TorqSoft designed exhaust system. BSA Bantams only have three gears and thus the exhaust design had to give a wide power band. The result was 25hp at the rear wheel with the engine coming on the pipe at 7000 revs/min and producing usefull power to 11000 revs/min - using the original cast iron 125cc cylinder.
50cc Minarelli AM6 Engine - 17.76 hp
Aprilia AM6 engine (40.3 mm bore, 39.0 mm stroke) converted to disc valve induction by Torqsoft. Dyno curve below shows an excellent peak power of 17.76 hp @ 14,750 revs/min with useful overrev to 16,000 revs/min. The engine pulls strongly from 11,000 revs - 8.33 bhp - which is actually greater that the production engines peak power, thus giving the engine a very useful 5,000 revs/min power-band.
The cylinder used for this test is homologated and fully road legal. Carburation is via a 20 mm diameter diaphragm carb.
Bridgestone 350cc (1968)
Pipe design for a 350 Bridgestone Racer. This project required a specially designed pipe due to the lack of ground clearance.
74cc Cobra Drag Bike
Bike is the Cobra cx50 motocross bike with large bore cylinder and an extended swinging arm. Pipe has been designed to peak engine at 13,200 revs/min.
2013 TM85 Motocross Bike
Bike is the TM85 motocrosser. Pipe has been designed to peak engine at 12,000 revs/min with excellent over rev to 13,000 revs/min.Engine pulls extremely strong from 8,000 rev/min resulting in a very flexible power band.
