Creating a realistic, pitch shifting engine noise

Blitz3D Forums/Blitz3D Beginners Area/Creating a realistic, pitch shifting engine noise

How does one go about creating a realistic sounding, pitch shifting engine noise? I can think of multiple ways, I'm just wondering before I start down each route what people think.

I'd like to lay down something simple first, then maybe switch to a gear-shifting sample later (if it sounds better, which I reckon it will).