Vehicles manufactured on or after 1 July 1976 to 1 January 1986 must comply with either ADR 27A, 27B or 27C, including: Vehicles manufactured on or after 1 July 1976 to 1 January 1986
This project required a specially designed pipe due to the lack of ground clearance. Dyno curve for 50cc AM6 Engine TorqSoft - 50cc AM6 Engine Dyno Testing Bridgestone 350cc (1968) Carburation is via a 20 mm diameter diaphragm carb. The cylinder used for this test is homologated and fully road legal. 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. Dyno curve below shows an excellent peak power of 17.76 hp 14,750 revs/min with useful overrev to 16,000 revs/min. 2010 Championship winning 125cc BSA Bantam 50cc Minarelli AM6 Engine - 17.76 hpĪprilia AM6 engine (40.3 mm bore, 39.0 mm stroke) converted to disc valve induction by Torqsoft. 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. BSA Bantams only have three gears and thus the exhaust design had to give a wide power band.
Pete Tibbitts emerged victorious with his TorqSoft designed exhaust system. 50cc Cobra BSA Bantam Road RacerĪfter a very competitive 2010 British BSA Bantam Championship, it went to the wire with three riders in contention at the last race - Cadwell Park. Indeed with only one race to go in the 2011 championship series, Simon has an 100% win rate. 2016 - 1st Mike Powellįirst long stroke 125 cc engine to win championship in 39 years 2015 - 1st Mike Powell 2013 - 1st Mike Powell 2012 - 1st Nick Bramley 2010 - 1st Pete Tibbitts 50cc Cobra Motocrosserįirst 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. Over the years we have had a number of riders win the BSA Bantam Championship using Torqsoft designed pipes. Top Success Stories 1st - 2015 BSA Bantam Championship
BIKE SILENCER DESIGN PDF PDF
Click on the image below to open a sample exhaust design pdf file. This pdf document will then be emailed to yourself. 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. Note that you do not require a paypal account as you can use your credit card. Next enter the cylinder bore and stroke which are 40.3mm for the bore and 39.0mm for the stroke.įinally, enter the exhaust duration of 184deg and the peak power speed of 12500 revs/min and click the Design Now button.Ĭheck your input data and click the paypal button. In this example the dimensions are 45mm and 27mm respectively. The diameter is the internal diameter of the exhaust flange. This is the length from the piston face to the end of the exhaust flange. Next enter the dimension for the exhaust port. Exhaust Ports input box and enter 5 in the No. This cylinder has two exhaust ports and five transfer ports so enter 2 in the No. In the design form first select the water cooled and reed induction options from the dropdown menu's. Our example has an after market 50cc performance cylinder with a bridged exhaust port. 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. For our design example we are going to design an exhaust system for a 50cc Minarelli AM6 engine.
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