Wiseco Is Ready For Direct Injection – Are You?

Your first reaction here might be to wonder exactly what you’re looking at here. You know it’s a piston from Wiseco, of course, but you’ve probably never seen a dome shape quite like this, and you definitely won’t be able to guess the application. We won’t keep you in suspense, though – this is their new domed piston for the Mazdaspeed3. That, of course, brings up a whole new question; namely, why do we even care about a piston for a turbocharged import?

The answer to that question lies in the fact that it’s a direct-injection engine, where fuel is sprayed directly into the combustion chamber, much as it is in a diesel engine. If you’ve been paying attention to Ford’s new Coyote 5.0L, you may also be aware that the head castings for that engine already include a curious bump in the combustion chamber that is the telltale sign of a future switch to direct injection. That means that the same technology seen on this Mazda piston will directly relate to the DI Coyote, when it finally hits a year or two down the line.

The stock piston is a flat-top design, but the “smiley face” shape seen in Wiseco’s slug has a specific purpose – giving the DI injector a “catcher’s mitt” (the face’s nose) to improve distribution, and the milled-out “mouth” controls compression ratio by virtue of total chamber volume. Through careful engineering, Wiseco can extend the crank angle range for the injection event, and avoid cylinder wall wash-down as well.

So now you know why you should be concerned about an import four-banger piston; DI for the Mustang is coming, and Wiseco is already prepared to do some interesting things with it.

About the author

Paul Huizenga

After some close calls on the street in his late teens and early twenties, Paul Huizenga discovered organized drag racing and never looked back, becoming a SFI-Certified tech inspector and avid bracket racer. Formerly the editor of OverRev and Race Pages magazines, Huizenga set out on his own in 2009 to become a freelance writer and editor.
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