danST Engineering are pleased to offer this high quality lightweight aluminum spun trumpet. Features:
30mm Overall Length (other lengths also available, see our other items)
75mm Outer Diameter at Radius End
Jenvey/Weber Lower Mounting Flange (65mm Hole Centers)
Lightweight Aluminium Construction
Natural Polished Aluminum Finish
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. We can supply aftermarket velocity stack kits for a variety of bike carburettors and throttle bodies, please see our other listings or contact us for more info.
These trumpets are also a universal design - the flange suits Jenvey and Weber type bolt down fitment with 65mm hole centers. The flange could also be cut off should you wish to connect to a throttle body with silicone hoses and jubilee clips.
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!