[Public-List] A4 Question

John's Email cooler2k at yahoo.com
Wed Jan 8 10:59:28 PST 2014


Bill,
Prior to the turn of the (previous) century, the ladies of your fair town - my home, suffered from "the Vapors". A mysterious malady that was unpredictable in occurrence and duration. Perhaps your "girl" is becoming a true Charleston Lady!

John C

Sent from my iPhone

On Jan 8, 2014, at 13:47, Bill Ydel <wcydel at gmail.com> wrote:

> Went to the boat about noon today temp was about 40 deg, I ran the engine again, started immediately and ran like a swiss watch. I again put it in gear and set the RPMs at about 1200, there were no  variation in the RPMs  for the 10 minutes that it was in gear. I then took it out of gear pushed the throttle all the way in and it settled at a smooth 800RPM.
> I don't know what the problem was but it appears to be fixed.
> 
> Thank you everyone for your messages.
> 
> Bill
> Sent from my iPad
> 
> On Jan 7, 2014, at 4:36 PM, Mike Lehman <sail_505 at hotmail.com> wrote:
> 
>> Bill
>> 
>> With all of the suggestions and diagnosis you have gotten from the the list...you MUST let all of us know what the final problem/solution was. :-)
>> 
>> 
>> 
>> 
>> ~~~_/)_/)~~ Mike Lehman ~~_/)~~~
>> 
>> 
>> -----Original Message----- From: Bill Ydel
>> Sent: Monday, January 06, 2014 5:18 PM
>> To: Alberg 30 Public List -- open to all
>> Subject: Re: [Public-List] A4 Question
>> 
>> Guys, I was going to say that ice could not be part of my problem since this is Charleston, "SC" but tonight it is supposed to go down to 22 deg and this town is in a panic.
>> 
>> Bill Ydel
>> 
>> Sent from my iPad
>> 
>> On Jan 6, 2014, at 5:01 PM, Michael Connolly <crufone at comcast.net> wrote:
>> 
>>> Steve,
>>> Carburetor ice is a distinct possibility. Especially as you have described your conditions of loss of power. There is no carb heat on our boats as an aircraft engine would have. On my engine (Gray Marine) there is really only in place a back fire arrestor not truly an air filter. This is all metal and would do nothing to keep the carb inlet temp elevated.  High humidity with temps just above freezing is a perfect scenario for carburetor ice.
>>> Michael #133
>>> 
>>> ----- Original Message -----
>>> 
>>> From: "Stephen Gwyn" <stephen.gwyn at nrc-cnrc.gc.ca>
>>> To: public-list at lists.alberg30.org
>>> Sent: Monday, January 6, 2014 4:29:00 PM
>>> Subject: Re: [Public-List] A4 Question
>>> 
>>> 
>>> My A4 sometimes runs less than perfectly in winter. It's
>>> usually hard to start if the temperature is close to
>>> freezing. Then it will run fine for 10-15 minutes, before
>>> losing a lot of power in gear. I'll motor out the marina
>>> in gear at idle, then speed up when I get out. A minute
>>> or two after that, as I'm in the middle of the current
>>> (and the rocks), the engine starts to slow down. Opening the
>>> throttle brings it back up to normal power, and after 1-2 minutes
>>> the engine starts to over rev. I then close the throttle
>>> a bit and the engine runs fine for the rest of the day.
>>> 
>>> The loss of revs only happens sometimes. It only happens
>>> before the engine reaches operating temperature. It never
>>> happens in summer.
>>> 
>>> I have some theories:
>>> 
>>> 1) Ignition system is damp or otherwise compromised by cold or
>>> possibly age. Damp isn't good for the points in particular.
>>> I replace the points, condensor, cap and rotor
>>> in the spring, so in winter they are at the end of their service life.
>>> But I don't think this is the case, because then the engine would
>>> run poorly from the start.
>>> 
>>> 2) Condensation in the fuel tank, which then gets into the fuel.
>>> More likely. Winters in Victoria are very humid and certainly the boat
>>> gets a lot of condensation in winter. But I have an over-sized
>>> fuel filter/water separator which I change regularly, so I'm
>>> moderately sure that's not it.
>>> 
>>> 3) Carburetor icing. If you put your hand on the carb throat
>>> when the engine is running, it's a lot cooler than the ambient
>>> temperature, and certainly a lot cooler than the nearby manifold,
>>> which gets quite hot. On cold humid days, I've noticed a thin coating
>>> of frost on the outside of the carb. My guess is that frost is
>>> forming on the inside of the venturi, restricting the flow of the fuel/air
>>> mixture into the manifold and into the cylinders. Eventually, however
>>> the manifold fully warms up and starts conducting heat to the
>>> carb. The ice melts, the venturi clears and the engine starts
>>> working normally again.
>>> 
>>> SG
>>> 
>>> 
>>> 
>>> -- 
>>> ------------------------------------------------------------------------ Stephen Gwyn                       | Tel: 1-250-363-3136
>>> Canadian Astronomy Data Centre     | Fax: 1-250-363-0045
>>> Herzberg Institute of Astrophysics | Cell: 1-250-885-6969
>>> 5071 West Saanich Road             | E-mail: Stephen.Gwyn at nrc-cnrc.gc.ca
>>> Victoria, BC, V9E 2E7, Canada      | http://astrowww.phys.uvic.ca/~gwyn/
>>> ------------------------------------------------------------------------ 
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