If only I had $30K lying under my mattress...
 

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8 cylinders.
2.8 litres
400 horsepower
10,500 rpm redline

That engine would be right at home in Ugly Betty

Fancy!

If I could get a decent fuel management system to go with that beast, I'll bet I could get 30 mpg out of it for regular use. 30 mpg Monday through Friday, and 400 hp on the weekends? It's every enthusiast's dream.

I wonder how/if it's related to the Radical V8 of the same origin? Radical V8 Progress Report - September 2004

will-ruh-VEL,
My 600+hp turbo DOHC straight six (2JZGTE) can get high 20mpg cruising on the highway...but I like the lightness-of-being of these 'busa based motors above.

Both use Hayabusa heads, but the Hartley motor uses a wider angle between cylinder banks (75* vs 72* for the Radical engine). I think beyond that, the differences are minimal.

140 lb. V8 seems extremely light...how much would a typical racing V8 weigh?

A typical Chevy 350 weighs ~650 lbs.
A Formula 1 engine has a minimum weight of 210 lbs.

I would love to have this in my car!

I think I just--yep, I did. I came a little.

A good fuel management system isn't that hard to come by or necessarily expensive. It's the tuning of such a system that takes lots of time and/or money.

I know it isn't that difficult to turbocharge a 'busa motor. I wonder if these could stand up to it :)