[Public-list] Atomic 4 compression

[J Bergquist]

Yes I am running through a 2:1 reduction that's correct.

I haven't really evaluated the whole thing yet. I am still putting things
back together, and even still taking some things apart...at least the boat
is in the water...

later,

J

On 7/10/06, Mike Lehman <sail_505 at hotmail.com> wrote:
>
> Yeah but you are running through a 2:1 reduction gear. The Atomic 4 is
> direct 1:1 drive. 1400 is about right for the A4, although you can reduce
> the pitch/diameter of the prop to get more RPM if you want.
>
>
>
> Mike Lehman
> ~~~_/)_/)~~_/)~~~
>
>
>
>
> ----Original Message Follows----
> From: "J Bergquist" <jbergqui at gmail.com>
> Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
> To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> Subject: Re: [Public-list] Atomic 4 compression
> Date: Sun, 9 Jul 2006 22:02:36 -0400
>
> I have a 13x8 2 blade with a Beta 16 HP diesel. I can run right up to 3000
> RPM. I have not measured speed because my speedo has never worked, and my
> GPS is also not working at the moment, but it appears that I can't go any
> faster than what I get at 3000 RPM. The boat throws quite a wake at that
> speed.
>
> Glad to hear you got your motor sorted out. I know how much it sucks
> futzing
> around with the motor on a sailboat. I'd much rather go sailing...
>
> Later,
>
> J
>
> On 7/9/06, Brian Palmer <Bpalmer at digitalarsenal.com> wrote:
> >
> > Thanks everyone for all the tips and advice.  I tried a number of
> things,
> > and this evening, I hit the last of the items that was causing the poor
> > performance.  Here's a brief run-down:
> >
> >
> >    - I checked compression for all the cylinders: 110, 108, 105, 110
> >    - re-gapped the plugs to 0.035 (they were set to 0.030)
> >    - I took the carb apart and cleaned it out, changed the gaskets, and
> >    realized I didn't have a good seal on the larger of the two gaskets
> > because
> >    the two cast aluminum halves are not machined perfectly flat... So
> with
> > the
> >    gasket in and bolted tight, I could see some light through the other
> >    side.... I used some permatex on both halves to assure a good
> seal.  I
> > was
> >    thinking this winter of taking each half, and running them over a
> flat
> >    surface with some wet/dry sand paper to try to true up the
> > surfaces.  For
> >    now, the Permatex does the trick.
> >    - Cleaned the prop
> >    - And the last thing that seemed to make the big difference.. I
> >    disconnected the fuel line and pumped fuel into a clear container and
> >    realized I had a fair amount of water getting through my Racor
> filter,
> > which
> >    I just emptied yesterday.  Turns out I had about a pint or 2 of water
> > at the
> >    bottom of the tank, and my model Atomic 4 engine apparently needs gas
> > to
> >    run, not water!
> >    - After pumping several gallons of gas in a container, letting the
> >    water settle, pouring the gas back in the tank through a water
> > separating
> >    funnel, and then pouring the last bit with all the water into a
> > disposal
> >    container... Finally I could pump fuel that was coming out water
> free.
> >
> > I took the boat out for a spin, and she now does a solid 5+ knots at
> > 1400RPMs.  I think I can't go higher RPMs because as I recall, I have a
> > 12x7
> > 2 blade prop, which I'm told is a bit too steep of a pitch for the
> engine,
> > and is bogging it down.
> >
> > The engine just feels much more steady and powerful, and  the throttle
> > feels
> > predictable, and I can run without the choke on at all.  What a
> > difference!
> >
> > Just curious, What size and pitch props do you all run?  It was
> suggested
> > to
> > me to try a 3 blade 10x6 prop instead of my 2 blade 12x7.  I'm told I'll
> > get
> > the RPMs up increasing my horsepower, and bogging the engine less, which
> > will make the engine run cleaner, and won't make the plugs get oily
> dirty
> > deposits.  I'm wondering if I repitch my 12x7 to 12x6, would that work
> as
> > well, but still keep the boat sailing faster for potential racing.  For
> > now,
> > the 12x7 works just fine... I'm just thinking the engine might last me a
> > while longer if it's not working too hard all the time.
> >
> >
> > -Brian
> > L'Esprit #288
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