Re: Doh

On Wed, 31 Oct 2007 21:42:33 +0100, Ace <seesig@xxxxxxxxxx> wrote:

It shouldn't really make that much difference to fuel consumption.

Although the engine turns faster the energy required to do that speed
doesn't change so it uses a similar amount of fuel. The only difference
will
be slightly higher mechanical losses at a higher speed but these are often
offset by better thermal efficiency.

I was going to make exactly the same point.

I haven't got the knowledge to disprove this but are you saying that you
will get similar economy on your 10R at 70 mph in 1st as you would top?

Approximately, yes.

Ooop, I think you are _very_ much mistaken. I've experimented somewhat
with the cars, trying the same speed on the same road in different
gears, and without fail the higher gear give better fuel economy at a
constant speed on the flat, this only starting to fail if you need to
accelerate or give it gas on an uphill slope.

OK, so let's take this too it's logical conclusion - a higher gear
uses less fuel, yes? So, we fit cars with huge overdrives. But, now
they won't pull the gear at 60mph, so we use a bigger motor - after
all, if it's only turning *very* slowly, it'll use less fuel, won't
it.

So we'll all be driving around in 25 litre V8s, turning over at
300rpm, and doing 120mpg.

Maybe.

Instead, why don't you try and explain *why* running a higher gear
would use less fuel?
--
Champ

ZX10R | GPz750turbo | GSX-R 600 racer
My advice as your attorney is to buy a motorcycle
To email me, neal at my domain should work.
.

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