- 2019 CX-5 AWD
Found this interesting video by Mazda that explains some of the working principles of the 2.5T.
To eliminate the problem of intake valve deposits that plague current direct gasoline injection engines, the engineers at Mazda determined that deposits are formed when intake valve temperatures fall below 400 degrees C. Measures were taken so that the intake valve would operate above this point to reduce deposit formation. One of the biggest issues with direct injection engines is a build up of deposits on the intake valve. Mazda determined that this was largely due to the intake valve being too cool. A lot of analysis went into designing the heat paths away from the valves to keep them at the proper temperature to avoid deposit formation.
As always, thanks for posting this stuff.
My obsession with watching videos/reading articles on the CX-5 I developed when car shopping has not subsided.
One of the comments referenced this MotoIQ article that (in part) discusses how Mazda has dealt with the carbon build-up that Direct Inject engines are prone to.
You gotta wonder if being an engineer with Mazda is as much fun as it sounds like it would be.
Interesting link, thanks for posting.
Yes, the GDI carbon buildup was definitely a concern for me for longer term ownership, Mazda has taken some steps to address it.
Still considering a Seafoam or Marvel Mystery Oil treatment at some point if I keep the vehicle long term. The GDI system is still more prone to carbon buildup than port injection.
(see here at 10 minutes)