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John Cooper "full RPM for a moment followed by a loss of RPM"
John , if line to carb is partially plugged, it would do just that. When engine is off, the bowl fills and RPM seems normal, but only until the fuel going in is slowed to a creep due to the partial plug. Similar to what happens when you shut down by closing the main fuel valve. As the fuel level in the bowl lowers for what ever reason, the mixture goes lean and for a short time RPM increases until too lean and then it shuts down.
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John
1. No carb leaks whatsoever when the engine is off (header tank valve open).
2. IMHO the most credible theory, so far, is partially obstructed mixture
plate holes, suggested by both H Francis and WR Bayne. Crud shifting around
the mixture plate holes would explain the changes in behavior.
3. Grounding the thing is good advice.
Regards
Eliacim
Quoting John Cooper <[EMAIL PROTECTED]>:
> ----[Please read http://ercoupers.com/disclaimer.htm before following any
> advice in this forum.]----
>
>
> At 11:52 AM 6/26/2006, Ed Burkhead wrote:
> >Stromberg carbs have some small air passages related to the mixture
> control.
> >These lead to the mixture control assembly which has a fixed (removable)
>
> I'm more than a little concerned about this issue. Off the top of my
> head, I can't think of much you can do to a Stromberg that will
> result in a rich mixture without also having a leak when the engine
> is off. One thing that could be causing it is an obstruction in the
> inlet system, before the carb, but that doesn't fit with the "full
> rpm for a moment followed by a loss of RPM" as described before.
>
> The engine should not run at sea level with the mixture all the way
> out and the throttle all the way in.
>
> At the very least, I would NOT fly it until I was convinced I
> understood the problem and had corrected it.
>
>
> John Cooper, A&P
> Skyport Services
> PO Box 249
> 4996 Delaware Tnpk
> Rensselaerville, NY 12147
> 518 797-3064
> Fax 518 797-3865
>
>
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