Originally Posted by Jafro

Truly what you describe is a Saab. The 95 Aero has a variable compression turbocharged engine. It changes its compression ratio as you drive to compensate for variations in weather and road conditions to offer the best of both economy and performance. It packs a substantial amount of horsepower for what the engine is... It can change from 8:1 to 14:1 compression by varying the pitch of the head. Ahead of its time? Maybe. It's a european pseudo-luxury car that's one of the top rated vehicles for safety. Other manufacturers have tried to build an engine like this and got it all wrong.