20390Re: [Michalak] Re: Motorsailing?
- Jan 1, 2010I've never heard of a rule like that, Andrew. Do you have any links that
might enlighten us? The only currently made 4-stroke outboard with an air
exhaust is the Honda 2 (maybe -- they've used both water exhaust and air
exhaust over the years; my air-cooled mid-nineties Honda 2 has a below
water exhaust), unless Briggs & Stratten are still making their outboard...
Nels, a one cylinder engine doesn't have to turn faster to make the same
power as a two cylinder one. The engine speed has to do with engine
capacity (displacement) for a given power, and other tuning concerns.
Roughly, a 5 cu. in. engine would have to turn much faster to produce 5
hp. than a 10 cu. in. engine would, but a 10 cu. in. one cylinder engine
and a 10 cu. in. two cylinder engine would turn about the same speed to
produce 5 hp. The one cylinder engine _sounds_ like it's turning slower,
because it has half the number of explosions per minute...
On Fri, 01 Jan 2010 13:48:44 -0800, Andrew E wrote:
> Regarding exhaust.. it is worth mentioning that many fresh water bodies
> of water prohibit 2 cycle engines OR the venting of exhaust into the
> water. Instead must be outboards with air exhaust and suitable muffler.
> --- On Fri, 1/1/10, Nels A <arvent@...> wrote:
> From: Nels A <arvent@...>
> Subject: [Michalak] Re: Motorsailing?
> To: Michalak@yahoogroups.com
> Date: Friday, January 1, 2010, 11:39 AM
> How would you evaluate the noise level when cruising at half-throttle? I
> believe a one-cylinder engine is a bit more noisy as it has to run at a
> higher rpm to get the same power as a 2 cylinder.
The problem with people who have no vices is that generally you
can be pretty sure they're going to have some pretty annoying
virtues. (Elizabeth Taylor)
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