[Public-list] Atomic 4 compression

[David Parkes]

Thank you all for the interesting discussion on cylinder compression, oil 
and gas.  I've just had the valves and seats ground  and now I have about 
85-90psi in all cylinders.  I'll finish re-assembling the engine and let you 
know how it runs.  I agree with George's comments about regular gas and low 
compression engines, but I'll have to give a bit more thought to the 
synthetic oil arguments.   I'll let you know how it goes.
David Parkes
----- Original Message ----- 
From: "Jay Davenport" <jay at saildriver.com>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Wednesday, July 05, 2006 12:02 PM
Subject: Re: [Public-list] Atomic 4 compression


> Brian,
>
>  My experience with my Atomic 4 is that it will rev to about 2600 rpm, 
> although I never do that. Normal cruise speed is 1800-1900 rpm. If I am in 
> a hurry, I might cruise at 2200 rpm. I have a 3-bladed prop (I don't 
> remember the size), and I use Mobil One 10-30 oil. I love the engine. It 
> is very reliable. Most of the problems I have had over the last 12 years 
> have been fuel related. I now have two 16 gallon aluminum saddle tanks in 
> the cockpit lockers, custom built by RDS in Florida. The fuel feed from 
> each tank has a separate shut-off valve, and large spin-off fuel 
> filter/water separator. My compression is about 85 PSI on all four 
> cylinders.
>
>  regards,
>
>  Jay Davenport
>
> Brian Palmer <Bpalmer at DigitalArsenal.com> wrote:
>  Speaking of the Atomic 4's, can I get an idea from my fellow Albergers 
> what
> RPMs you run your A4s at to achieve cruising speed (and what speed you
> generally power along at)?
>
> I'm experiencing problems with my A4 where it seems to be lacking power. 
> It
> runs just fine out of gear, but in gear, I cant get it above about 1200 
> RPMs
> on a good day. On a bad day, it stalls out, and will only continue to run
> when I choke the engine quite a bit.
>
> When idling out of gear, it runs smooth, and will rev up smoothly, but 
> under
> load it doesn't do so well.
>
> I had someone suggest that I might have a leak in the seal around my carb,
> which would explain the need to choke it to pull in extra fuel to mix with
> the extra air leaking in. Does anyone have a suggestion I can try?
>
> -Brian
> L'Esprit 288
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