RogerM wrote:
> "Noddy" <me@[EMAIL PROTECTED]
> wrote in message
> news:47a3ccbc$0$11523$c30e37c6@[EMAIL PROTECTED]
>> "RogerM" <RogerM@[EMAIL PROTECTED]
> wrote in message
>> news:13q79mq2rti87a2@[EMAIL PROTECTED]
>>> invent an engine that say, is 6cyl, when on the highway at cruising
speed
>>> and not labouring (or liberaling) have some kind of device fitted that
>>> drops the fuel inlet to say 2 or 3 cylinders to conserve fuel and then
>>> when the power was required again switch to extra an cylinder or
>>> cylinders for the added power? Just a thought and probably not
feasible
>>> but I thought some of you guys in here could give an explanation as to
>>> whether it would work or not.
>> Such ideas have been around for decades, and Cadillac had a V8 engine
that
>> could progressively shut down from 8 to 6 to 4 cylinders on the fly as
>> demand dictated. It wasn't overly successful as it never worked as well
as
>> a boosted small engine would or does, and most people who buy cars with
>> large engines couldn't give too much of a **** about fuel economy
anyway.
>>
>> It's a far easier and simpler solution to use a smaller capacity engine
>> with forced induction bringing the boost (and ultimately power) on as
>> required rather than having a large engine and then trying to shut it
down
>> in stages to make it more economical.
>>
>> --
>> Regards,
>> Noddy.
>
> Yes, I guess that makes sense as there would still be a certain amount
of
> drag from the compression of the cylinders that would not be firing. and
> just going along for the ride. It's just I was under the impression
> Turbo'd/supercharged engines were gas guzzlers.
>
> Beers & Cheers
>
> Roger
>
>
Engine power output (thus fuel ecomy) is basically a direct result of
the amount of air throughput - no matter what it's capacity. Good
design will help somewhat though.
--
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