Top definition
Acronym for Spark Ignition Direct injection

It's the gasoline form of direct injection originally used only on diesel engines, now being used on some gasoline engines. Improves efficiency and power output.

Fuel injectors used in direct injection systems are more expensive than standard fuel injectors due to requiring more durable materials to withstand higher temperatures as the fuel injector is placed right into the combustion chamber.
This new SIDI engine sure is powerful, and the fuel economy ain't to bad either.
by ionyou February 18, 2011
Get the mug
Get a sidi mug for your coworker Vivek.
A Scottish farmer who has intimate (typicall sexual in nature) relationships with their sheepdogs. Created by the Irish as a way of insulting the Scottish. Many Scots find this extremely insulting to theirselves and their ancestors.
Your uncle is such a badass sidi.
You sidi!
Ewww, he's a sidi.
by harry23243 August 07, 2007
Get the mug
Get a sidi mug for your barber Yasemin.
you're crazy hard workin and always do hella extra therefore nerd. but at the same time ur as childish as a 12 yr old girl and then you have this fuckin movie nerd side of you were you obsess over celebs like a weirdo. then you likes fuckin travis and trap music and somehow that helps you write essays and at the same time you enjoy shit like harry styles like
by Hunnys May 16, 2017
Get the mug
Get a Sidi mug for your friend Helena.