BREIGHTON FERRY DYNO DAY WITH YORK SCOOTER CLUB SEPTEMBER 2016
York Scooter Club’s return to Breighton was a no brainer for the organisers. After last year’s success and having found a gem of a venue, there was huge demand for a second event to go ahead and they didn’t disappoint!
With a natural desire for the second event to better the first, all areas of this event were pushed to the max, in order to improve or extend the entertainment further, including a dyno ‘run what ya brung’ event which operated over two days. Starting at noon on Friday and continuing all day Saturday, every available minute was required to cram a total of 46 scooters in for dyno runs to assess bhp, torque and power spread of a wide variety of machines. We eagerly persuaded as many as possible to get involved and were not disappointed with the response. A vast array of scooters were tested and showed the event to be Lambretta dominated with just one Vespa, one auto, four hybrid bike-engine scooters, one Targa-Twin and one hybrid-geared Lambretta/auto conversion among the 46 we tested. A couple of demo scooters were also invited along, as well as a sprint Lambretta, in order to give those bike engines a bit of competition, there was also a newly built development motor which had just been completed. This unit threw up some very pleasing figures.
How much power!?
The results table has been grouped into figures showing similar capacity motors/ models together, and provides the following information for components on each machine: cubic capacity (engine size e.g. 225cc, 252cc etc.), kit type (e.g.
Monza, TS1, Malossi etc.) and exhaust type (e.g. Franspeed Race, Clubman etc.). Also included is, the most important bit, power (bhp) and torque (lb-ft).
Level playing field
Forty-six scooters were dyno’d in total and each had three runs to fully warm the motor and clear the jetting, thus allowing the machines to produce their maximum power readings. Each scooter was run from low rpm (on average 3000rpm but lower on some that could do so) and stretched to its maximum rpm, so as to give a full and broad reading of the overall power delivery of each machine. The majority of machines also had tyre pressures checked and set to 30psi, as this affects friction and so gives an even playing field to all tested. The open air environment did provide some barometric changes which no doubt altered readings just slightly over the two days, but these changes are minimal in the bigger scheme of things. Given that this was an open air event, and one instigated for fun rather than serious competition, the test parameters were as good as could be hoped for. Despite the ‘fun’ intentions though, competitive spirits always surface, as do great opportunities to collect and analyse data. This event was no exception.
Data collection and analysis is a painstaking and time consuming process, but ultimately it is this data which helps customers to choose the right kit/components for themselves, and helps dealers offer the right information to their customers. It also allows tuners like myself and others to further our knowledge and make fact-based, data-driven decisions, in order to improve further. Sharing this hard earned data is not something a lot of tuners do, but each to their own. I hope you enjoy the read, and glean something useful for your own knowledge.
Mugello: In blue the 225 with Clubman putting out 18bhp, in red the 225 with Franspeed Race putting out 21bhp, and in green the 230cc TT with TT Mod TSR Evo putting out 26bhp. The benefit of the clubman is its user-friendly bottom end power. The port...
Eric’s 246cc TT Super Monza putting out 44bhp, although this doesn’t come ‘on song’ until 6000rpm. By comparison, Rob’s 238cc TT Monza is putting out a stonking 38bhp under 8000rpm and is pulling from low revs.
Sticky’s DRZ 400 @ 32bhp vs Peter’s Gas Gas 450 @ 41bhp – both with long/broad spreads of power, picking up from low revs and continuing on nicely to give good top speeds.