[Public-list] Atomic 4 compression

[Jay Davenport]

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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