Volvo's supercharger + turbocharger
On Sun, 21 Jun 2015 17:40:11 -0400, Ed Huntress
wrote:
For the gearheads:
If you think that engines are getting too complicated, you'll want to
take a look at Volvo's T6 engine. It has both a mechanical
supercharger and a turbocharger.
This has been in the press for around a year, but the engine is
available in two cars, is in production, and is getting some reviews.
Apparently it's very nice to drive. I wonder how nice it is to
repair...
The Eaton supercharger is there for low-end boost, to make the 2-liter
4-cyl. feel like a V8, with no turbo lag. At around 3500 rpm, a clutch
disingages the supercharger and the turbo, which is now fully spooled
up, takes over. It produces 302 hp and 295 ft.-lb of torque.
It's impressive engineering but I think they just tipped over the
edge. With direct injection, variable cam timing, and two types of
superchargers, it has to make mechanics gulp. I hope they've given as
much thought to maintenance and repair.
The Detroit Diesel engine had both roots blower and turbo, in some
instances. And yes, I know what it as for but the roots "blower" did
give an intake pressure higher than atmospheric, thus was a
"supercharger" by definition :-)
And didn't VW market a car that had this system? Called the GT TSI, or
some such name. Back in 2005, or thereabouts.
Add variable valve timing (which is old hat now-a-days_) and Viola! A
NEW Design :-)
--
cheers,
John B.
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