Folks
Before we get to excited about a cooler carb please consider what is happening
in a running carburetor controlled engine. The carb acts like a swamp cooler.
The vaporized fuel is mixing with air and the charge mixture is as cool as it
gets before ignition in the combustion chamber. Ever notice little droplets of
moisture on the exterior of the carb body when humidity and heat is just right?
The real overheated carbs usually occurs when the airflow (radiator fan wash)
over the engine is limited or restricted (read stuck in traffic or
participating in the 4th of July parade). Worst case is when you shut down the
engine and the engine begins the process of trying to make everything in the
engine bay the same temperature. Hot! The photos do show the hottest areas on
the engine, exhaust area and the head. Without airflow and vaporization in the
carbs they rapidly begin to heat up. So does the fuel in the fuel bowls. How
hot does it have to be to cause vapor lock?
Just a few thoughts for consideration and comment?
Perry
From: Bob England
Sent: Thursday, July 26, 2018 5:03 PM
To: 'David Nock BCS'; healeys at autox.team.net
Subject: Re: [Healeys] Interesting (?) Photos
David
I noticed that too - I figured the carbs would show warmer. If I remember
I'm going to bring the unit home again this weekend and poke a bit more
under the bonnet.
Keep in mind that this is one car in one circumstance - the guys chasing the
overheating issue might see something different with thermal images of their
cars (it would be interesting to know).
I must admit I have not been following an overheating carb thread. What is
the issue? Maybe I should take some more thermal images around the carbs.
Thanks.
Bob
-----Original Message-----
From: David Nock BCS [mailto:healeydoc at sbcglobal.net]
Sent: July 26, 2018 9:57 AM
To: Bob England; healeys at autox.team.net
Subject: Re: [Healeys] Interesting (?) Photos
The interesting part that I see is that there is very little heat at the
carbs, So that tells me that the problem everyone is chasing of overheating
in the fuel in the carbs may not exist.
David Nock
British Car Specialists
209-948-8767
www.britishcarspecialists.com
-----Original Message-----
From: Bob England
Sent: Tuesday, July 24, 2018 4:29 PM
To: healeys at autox.team.net
Subject: [Healeys] Interesting (?) Photos
I thought I'd share a few photos of the engine running in our BJ8.
Photo 28 is taken near the front right headlight looking down. 29 is taken
from above the right front wheel looking towards the radiator. 31 is from
the same position looking down at the valve cover and distributor.
I'd taken these when trying to find toe-frying hot spots in the foot-wells.
Not the greatest photos, but interesting nevertheless.
Bob
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