danST Engineering are pleased to offer this high quality lightweight aluminum adjustable spun trumpet assembly. These trumpets are priced individually (PER TRUMPET), therefore for a typical 4 cylinder application 4-off these parts will be required.
Each trumpet assembly features:
80mm - 110mm Overall Length Adjustment (50mm - 80mm also available, see our other items)
2 x Mounting Holes on 65mm Centres (Standard danST, Weber, Dellorto and Jenvey Fitment)
78mm Outer Diameter at Radius End
Lightweight Aluminium Construction
Natural Polished Aluminum Finish
Discrete single-ply silicone joining cuff
2 x 9mm wide Stainless Mikalor Clips
danST Engineering began manufacturing these trumpets due to a shortage of available and reasonably priced trumpets for fitment on our specialist carb and throttle body conversions.
The overall length of an induction system (from carb or throttle body mouth to back of inlet valve) can have a dramatic impact on both power and torque. These trumpets are designed to offer the ultimate in fine tuning of this dimension. Trumpet length can be easily adjusted during the tuning stage and then locked in position once the optimum engine characteristics have been established.
Below are links to two different engines fitted with two popular bike carb kits (one 1800 zetec with R1 Mikuni carbs, one Ford 2.3 Duratec fitted with ZX9R carbs). The lower lines are both carb sets without trumpets and the higher lines are when fitted with our 50mm trumpets. In both cases significant performance increases (typically 5-9bhp) are seen between 3500-6000rpm when the carburettors are fitted with our trumpet kit. Additionally the torque curve is seen to be much smoother. Note that the Duratec is making peak power very low in the RPM range due to a very restrictive exhaust (soon to be replaced!), but the effect of the trumpets on engine performance is clear. We see so many bike carb conversions running without any trumpets (bike breakers often remove them along with the original bike airbox) - ALL of which would see the benefits highlighted below, probably the cheapest power you can find!