Engine : Single cylinder 4 stroke with balance shaft
Power : 38 HP at 12,000 rpm
Torque : 28Nm
Displacement : 249.6 cc
Personnal note : The EFI allows for multiple power bands (15 to 28hp in leisure mode, up to 40hp in competition mode). It is distributed and used by Sodi on their high end leisure karts. Fun fact, Sodi used two of them on the same bi-seat kart they used during the SWS World Final. Still not great on reliability (needs a rebuild every 40 hours), which makes them a meh choice compared to the Rotax Max even in Leisure karting.
As a conclusion, all those engines came out in 2005 - 2010, mainly because the FIA wanted to move from the archaic, outdated 2 strokes. Let’s say, it didn’t work well.
Obviously but it doesn’t mean you can’t try to make it better. I absolutely love 2 stroke engines, but I prefer being able to drive at all.
4 stroke with e85 biofuel could be a sensible direction
I don’t think it makes an ounce of difference. With regard to drive something or nothing, the green movement makes no distinction between 2/ and 4/. If it goes bang, that’s all they care about.
It was more about listing the other 4 strokes that are not tillotsons, that were developed for karting and imported in the US. The Hondas are not karting engines at first
2-strokes aren’t very racer health friendly, especially when used with leaded fuel (US). Too small in number to have any environmental significance - but of course that doesn’t stop the greenwashing FIA.
Carbon Black does prevent a tire from losing its black color over time, but that is really only relevant in a non-racing tire that lasts for years. Structurally Carbon Black adds Abrasion Resistance, Stiffens the rubber and Cohesion between the molecules (less cracking and splitting).
In the late 90’s I was working for Bridgestone/Firestone. The Company was/is real big on training. Part of which was the development of Long Length Carbon Black Molecules used in the tire’s construction. It was stated that the Longer Molecule increase Abrasion Resistance and Improved Rolling Resistance. They could then make the tires Softer providing better Traction and simultaneously increasing tire Life.
I recently saw an Article from a few years ago talking about how Single Walled Carbon Nanotubes (SWCNT) might replace CB in tire manufacturing. Early test showed significant improvements over CB with far less material needed.
