how many rotations of crankshaft does it take to fire all cylindersof v8 engine

Didn't Felix Wankel invent the Wankel engine? I think NSU (Germany) was
the first to sell Wankel engine cars.There was at least one German
motorcycle with a Wankel engine.There have been advancements in Wankel
engine technology over the years.Do any auto companies build and sell
Wankel engine vehicles nowadays? Wankel engine model airplane engines
are available nowadays, I think so.
cuhulin

wrote:
> Didn't Felix Wankel invent the Wankel engine? I think NSU (Germany) was
> the first to sell Wankel engine cars.There was at least one German
> motorcycle with a Wankel engine.There have been advancements in Wankel
> engine technology over the years.Do any auto companies build and sell
> Wankel engine vehicles nowadays? Wankel engine model airplane engines
> are available nowadays, I think so.
> cuhulin
>

yes, the Mazda MX-8 still has a rotary engine. Not sure if there are
any others or not. Which is a shame because the RX-7 was so pretty and
the RX-8 has so much more power and looks like a SUV mated with a
Transformer.

nate

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Nate Nagel wrote:
> wrote:
>> Didn't Felix Wankel invent the Wankel engine? I think NSU (Germany) was
>> the first to sell Wankel engine cars.There was at least one German
>> motorcycle with a Wankel engine.There have been advancements in Wankel
>> engine technology over the years.Do any auto companies build and sell
>> Wankel engine vehicles nowadays? Wankel engine model airplane engines
>> are available nowadays, I think so.
>> cuhulin
>>
>
> yes, the Mazda MX-8 still has a rotary engine. Not sure if there are
> any others or not. Which is a shame because the RX-7 was so pretty and
> the RX-8 has so much more power and looks like a SUV mated with a
> Transformer.
>
> nate
>

Of course I meant RX-8. Don't know what I was thinking, or not.

nate

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www.devilfinder.com
Swashplate Engines

There are many different kinds of engines.Some of them I have read about
many years ago.
cuhulin

Killer Kowalski wrote:
> Steve, please, no! let us not delve into even versus odd-firing!!!
> That is a whole-'nother topic....


Awww but its so FUN!! :-)
>
> (exercise -- an even-firing 90-degree (as used here, refers to the
> included angle between the banks) V-6... how can it exist? Hint: an even
> firing V-6 *should be* a 60 degree engine...)

Splayed journals on each throw of the crankshaft. The problem is that if
you splay the journals far enough to make it *truly* even firing, then
the crank is significantly weakened by the lack of metal overlapping
between the two adjacent journals. So most 90-degree v6 engines are a
compromise- they splay the cranks enough to bring it CLOSER to even
firing, but not so far as to make the splayed journals fail to overlap
and thus weaken the crank. I'd have to go look it up to be sure, but I
think the Chrysler 90-degree engines (the old 3.9 and the current 3.7)
have something like 128 and 112 degree intervals instead of perfectly
even 120-degree intervals. Thats decidedly better than the 90° and 150°
intervals of a non-splayed crank 90-degree v6 like the first Buick v6.

As you add more cylinders, odd-firing becomes less of a problem. The
Dodge Viper V10 doesn't even have splayed journals, its just got so many
cylinders that is very smooth feeling even with the inherent odd-firing
of a 10-cylinder 90-degree V engine. Gives it a really gnarly exhaust
note, though.

True or false: Even- or odd-firingness has nothing to do with engine
balance.