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Old February 8th, 2017, 16:46   #12
GoFaster
Moderator at Large
 
Join Date: Jun 1999
Location: Brampton, Ontario, Canada
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My current daily driver is a Fiat 500 with the 1.4 FIRE 16v MultiAir non-turbo engine. No rocketship (not even close!) but it gets the job done. It is overgeared in the interest of mileage. Right now, in winter conditions, it's doing a little better than 6 L/100 km.

In europe the same car had either a 1.2 FIRE 8v or the "TwinAir" 0.9 litre 2 cylinder engine. Apparently the TwinAir was the engine to get (right number of cylinders, historically correct even though it's at the wrong end of the car) but real world fuel consumption isn't any better than with the 1.2 or 1.4 MultiAir.

The FIRE series of engines is in the process of being replaced. The new choices are a 1.0 3 cylinder (replacing the TwinAir and 1.2 FIRE) or a 1.3 4 cylinder (replacing the 1.4 16v FIRE). Interestingly, the new engines only have 2 valves per cylinder and are SOHC with VVT, but no MultiAir, and have a very high compression ratio (13:1) and the cam drive is by chain rather than belt. I think someone's been doing some optimizing to get the same or better power output and economy but with fewer parts and less complexity and less maintenance. I'm totally on board with that.
__________________
Brian P.
formerly ... 2006 Jetta TDI 5-sp, Spice Red, Unitronics stage 1, 0.681 5th gear.
and before that ... 1996 Passat TDI, Silk Blue
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