This thread is to gauge if any/how much interest in my own trumpet design. Having completed my university degree dissertation, of which was design, theory, simulation and practical. Initially, an engine simulation program was used to replicate an old dyno graph to within 3% or less to establish a baseline, to which various lengths were chosen for Power and Torque comparisons. Once selected, these lengths were ran through CFD software to observe various factors such as pressure and velocity, where vena-contracta's were monitored. Material selection was crucial due to it's environment (and weather). Finally, validation through practical findings was vital as not all factory data to ensure engine simulation work was available. Below are some screenshots of my report to display the work carried out. To establish a background, my 2009 Daytona 675 was running the arrow slip-on map with MWR HE air filter and a full titanium Akrapovic race system. Further gains could be obtained through mapping for the selected lengths, but for research purposes, this was not done. These would be 3D printed as per my report and as you can see by the images below, 25mm lengths produced an increase of over 3bhp at peak, along with a slightly raised 'lower-end' (there is a dip in 'mid-range, but could be ironed out with mapping potentially'). As said, this is just gauging any interest as I am really proud of my project and thought it could benefit you guys Pricing, I'd imagine would be around £140 for a set of 3 but could be reduced depending on number of sets wanted. 1) Baseline Engine Simulation 2) Other Engine Simulation Focal Points 3) Pressure Waves within VS 4) CFD Simulations 5) Material Selections 6) Practical Results 7) 25mm_D vs Standard Graph 8) 45mm_D Installed
I would be interested! Also very jealous of you getting to do your dissertation on this, I’m sure mine is going to be infinitely more boring lol Sent from my iPhone using Tapatalk
What university are you at Jack ? I was lucky enough to get my own project choice, but some of the choices I would definitely not have enjoyed so much
Open university studying combined STEM, looking at stuff in sustainability, design and renewable energy. Tried the whole ‘do what you love’ thing and painted cars for 15 years and now I hate cars ha, I’ll keep bikes in my hobbies this time around I think Sent from my iPhone using Tapatalk
Ah awesome ! hope it goes well for you regarding the trumpets, I’d need a couple more people atleast so I can buy the correct material and make it viable, Hope you understand ? 1) Jack_12
So basically shorter length is better. Just as I've been telling my wife all these years . They look great it's a shame no one gets to see them. Great piece and very interesting. I'd be interested if you could get enough interest to bring the price down a little.
Interesting reading. Love this boffin stuff. I'm curious as to why the dimples improved the performance. Is it because the dimples set up small vortices that help with the airflow? Once I get my electrical issues sorted I’d be interested in buying a set.
Im definitely interested in buying a set. love the dimple idea edit: would there be any benefit to flaring out the top more like on venturi systems trumpets?
Correct, golf ball dimples generate vortices which help carry the ball further than a non-dimpled ball, However the research into the ‘ideal’ dimple geometry is a project on its own. So even though my dimple design worked, it doesn’t mean it’s the best geometry, but as my project aim was based upon producing greater power and torque, I met my goal.
Potentially, but like the dimple geometry, research into different dimensions would have to be carried out. My design was based upon the dimensions from a research paper, and allowed easier printing as I had one design for each velocity stack rather than 3 individual designs. Additionally, circular stacks produce better results than oval, so having a symmetrical design was chosen.
1) Jack_12 2) Buzz675 3) Beckett50 4) Mrguibo anymore takers ? If so, I can re investigate costs and viability of printing.
No I haven’t, I just thought this would be the best place for initial interest. I could probably post on Facebook 675 pages also. Need to see if my mates 3D printer is fine to print the material, and how much he’ll charge me for using it
Ah gotcha. Once you get the price and the quantity you can make figured out , I would look to Reddit if you want/need more people. There’s a number of active triumph subreddits
I might be interested!! But I would like to know the price and also know if you can send them to me to Spain.
