Comments on: Small Engine, Big Mileage, Same Power? Just Say “GDI”

By: Alex R.

Alex R. — Wed, 31 Oct 2012 04:21:36 +0000

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By: Robert4545

Robert4545 — Mon, 30 Apr 2012 10:51:24 +0000

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By: dentist essex

dentist essex — Sat, 17 Jan 2009 18:39:00 +0000

it is really cool idea, hope this will help to come out from the ecomoic crisis and will bring totally new way, Cheers,

By: Corky

Corky — Fri, 16 Jan 2009 01:35:00 +0000

I love the whole idea but I don’t like congress mandating the auto industry regarding when and what mpg vehicles need to by a certain time. I say stay out of it.

By: Kitchen Design

Kitchen Design — Fri, 09 Jan 2009 11:20:16 +0000

Thanks for the helpful information

By: BMW

BMW — Wed, 07 Jan 2009 04:24:00 +0000

Great informative material and i agree with GDI engine’s fuel injectors squirt the gas directly into the cylinder. Modern electronics now allow very, very precise calculation and metering of each separate injection. And remember, if the engine is turning at 3,000 rpm, there are more than 10 such injections every second.

By: water damage chicago

water damage chicago — Tue, 16 Dec 2008 05:58:00 +0000

35 mpg BY 2020? Absolute rubbish. That technology ALREADY exists! In fact, this technology has existed for many, many years, but these automakers keep milking the consumers. Every year up until 2020, they will increase the fuel efficiency on their cars by just a couple or a few miles to keep milking us.

By: richard schumacher

richard schumacher — Fri, 29 Aug 2008 13:55:53 +0000

As Sidney's experiment shows, only a few percent of the benefit of a hybrid comes from regenerative braking (recovering energy during decelleration). Most of the fuel savings comes from load-leveling: that is, the internal combustion engine is sized only for the average power required and not for the maximum power. This allows it to be much smaller than otherwise because the electric motor does much of the work of launching the car from a stop. Regenerative braking and engine-shutdown are smaller added benefits, but they come essentially for free as all of the necessary mechanisms are already in place.

A GDI hybrid should indeed do better than either technology alone, but of course it would be more expensive.