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Interesting experience in the Morgan yesterday. #756919
01/10/22 04:55 AM
01/10/22 04:55 AM
Joined: Mar 2011
Posts: 519
Victoria, Australia
1955er Offline OP
Talk Morgan Regular
1955er  Offline OP
Talk Morgan Regular

Joined: Mar 2011
Posts: 519
Victoria, Australia
Hi guys, long time no post!
Heading down to the big smoke ( Melbourne ) from country Victoria early in the morning, cold and damp despite being early Spring here.
Had been going for about an hour averaging 100 - 110Kph when there was a vague change in the note of both the air intake and the exhaust. Over the next few kilometres the change in sound intensified and there was a noticeable loss of power. Luckily came to an off ramp from the freeway, changing down through the gears as I lost more and more power until the engine died 😱

I had visions of the Mog going home on the back of a truck but first I did what everyone does in this situation………
Swore, got out, lifted the bonnet and tried to give the appearance of someone who knows what they’re doing🤣
Checked the usual obvious things, plug leads, distributor, fuel filter and then I noticed there was condensation all over the inlet manifold and carb ( Twin choke side draught Weber ).
While drying it all off with a rag I had a 💡moment…….started her up and after a bit of coughing and spluttering, all back to normal.
I was aware of the phenomenon but never experienced it in over 50 years of driving.

Kind regards to all.
Neil.


1975 4/4 4 seater, cream over blue; Q3 Quattro; Bicycle; Walking poles.
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756930
01/10/22 06:41 AM
01/10/22 06:41 AM
Joined: Jan 2013
Posts: 1,069
UK
BuyBritish Offline
Has a lot to Say!
BuyBritish  Offline
Has a lot to Say!

Joined: Jan 2013
Posts: 1,069
UK
Sounds like the carb was icing up caused by the cold and also the intake of fuel, this is further confirmed by the condensation on your intake manifold. Later in the hotter weather the car will go to the other extreme where you may have vaporlock where the fuel lines and carbs get to hot and again cause fueling problems due to the fuel turning to vapour in the fuel lines/carb.

So for now get some more heat into the carb area, ie reduce the cold airflow to the intake area ?

A weaker mixture due to the icing will cause bad fueling and resulting backfires noise in exhaust also.

Last edited by BuyBritish; 01/10/22 06:43 AM.

Rob Davies
Morgan 3 Wheeler 1934 MX
Morgan Series 1 1947
Morgan +4 1956 TR4
Morgan +4 2000 T16 Rov
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756932
01/10/22 07:03 AM
01/10/22 07:03 AM
Joined: Feb 2016
Posts: 5,462
East Harling, Norfolk UK
RichardV6 Offline
Charter Member
RichardV6  Offline
Charter Member

Joined: Feb 2016
Posts: 5,462
East Harling, Norfolk UK
Yes carb icing was my first thought and reducing engine power makes it worse given higher manifold depression. Carburated piston aircraft engines have a carb heat control use of which is part of pre-landing checks to offset icing when engine power is reduced.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756934
01/10/22 07:26 AM
01/10/22 07:26 AM
Joined: Dec 2008
Posts: 20,616
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 20,616
South Yorkshire
I've only ever had this happen on a Gilbern Invader on cold mornings at motorway speeds. A gradual but significant loss of power. I found that as the speed dropped away it cleared until the next time! The carb was located high up in the Vee with no warm air feed.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756935
01/10/22 07:44 AM
01/10/22 07:44 AM
Joined: Nov 2011
Posts: 5,940
Australia - NSW North Coast
OZ 4/4 Online content
Charter Member
OZ 4/4  Online Content
Charter Member

Joined: Nov 2011
Posts: 5,940
Australia - NSW North Coast
The joys of driving old cars Neil but it's good to hear you are safe and back on the road.....


A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756936
01/10/22 07:59 AM
01/10/22 07:59 AM
Joined: Oct 2019
Posts: 3,373
Aberdeenshire
Image Online content
Talk Morgan Addict
Image  Online Content
Talk Morgan Addict

Joined: Oct 2019
Posts: 3,373
Aberdeenshire
My first car (an Austin A40) .... had an air cleaner with a Summer/Winter position .... Summer the air cleaner intake pointed forward into the airflow .... Winter you turned it downward to pull warm air from over the exhaust manifold.

K

Re: Interesting experience in the Morgan yesterday. [Re: Image] #756940
01/10/22 09:00 AM
01/10/22 09:00 AM
Joined: May 2014
Posts: 4,238
Essex
Burgundymog Offline
Black Rat
Burgundymog  Offline
Black Rat
Part of the Furniture

Joined: May 2014
Posts: 4,238
Essex
Originally Posted by Image
My first car (an Austin A40) .... had an air cleaner with a Summer/Winter position .... Summer the air cleaner intake pointed forward into the airflow .... Winter you turned it downward to pull warm air from over the exhaust manifold.

K

I can remember that, think it was on my MG Midgets.


Keith
2013 narrow bodied + 4 Ruby.
Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756943
01/10/22 09:12 AM
01/10/22 09:12 AM
Joined: Oct 2019
Posts: 3,373
Aberdeenshire
Image Online content
Talk Morgan Addict
Image  Online Content
Talk Morgan Addict

Joined: Oct 2019
Posts: 3,373
Aberdeenshire
They'd both be A-series engines of the same period .... simple manual and foolproof ... nowadays there'd be solenoid operated flaps worked from the ECU taking GPS co-ordinates and live updates from a weather satellite .... and cost £2K to repair when it went wrong! 😄

K

Re: Interesting experience in the Morgan yesterday. [Re: 1955er] #756944
01/10/22 09:16 AM
01/10/22 09:16 AM
Joined: Sep 2009
Posts: 6,451
Köln Germany
Heinz Online content
Talk Morgan Sage
Heinz  Online Content
Talk Morgan Sage

Joined: Sep 2009
Posts: 6,451
Köln Germany
In my youth, the smaller and cheaper cars, at least some of them, had just such a lever to divert to warm or cold air, e.g. my Renault 6 MY 1975. More expensive cars sometimes had some kind of bimetallic switch instead of the manual mode to channel the airflow. So the drivers of these more expensive cars knew less about carburettor icing and remained dumber in technical matters.


'14 4/4 graphite grey
Re: Interesting experience in the Morgan yesterday. [Re: DaveW] #756953
01/10/22 11:02 AM
01/10/22 11:02 AM
Joined: Apr 2012
Posts: 57
Tisbury Wilts UK
J
JMcL Offline
Just Getting Started
JMcL  Offline
Just Getting Started
J

Joined: Apr 2012
Posts: 57
Tisbury Wilts UK
Originally Posted by DaveW
had this happen on a Gilbern Invader on cold mornings

Ditto experience with a Gilbern Invader Mk2 Estate. Can't be many ex-Gilbern drivers on here.

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