[Healeys] Interesting (?) Photos

David Porter frogeye at porterscustom.com
Tue Jul 31 04:23:08 MDT 2018

Historically speaking, Datsun 6 cylinder engines had the same issue. Their solution was a small fan with aimed ducts that straddled the valve cover and blew air directly on the carbs. I believe it was controlled by a simple temperature sensor.

On July 30, 2018, at 11:19 PM, Robert Begani <rfbegani at gmail.com> wrote:

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So Perry, if your analysis is correct, then the use of an electric fan pushing air through the radiator, combined with an air deflector underneath the radiator directing air from below into the fan and the engine compartment provides sufficient air flow over the engine to keep the carbs cool enough to keep them from overheating?  In addition, the fan should be kept operating while stalled in traffic and say 5 minutes before shutting down the ignition?


The fan seems to be the most used application, while the deflector and the bilge fan directing air directly to the carbs seems to be the next most effective application.  


I will let the list know when I get my BJ8 running as it will have the fan operating with a control on the dash board and the deflector underneath the radiator deflecting the air into the engine.


By the way, I have a friend who used an inline electric fuel pump near the carbs controlled with an on/off switch on the dash to increase the pressure to the carbs while in traffic, along with a radiator fan on his Triumph and never had a problem.  That application could be a 4th in a series of how to solve the problem of overheating and vapor lock.


Bob Begani

67 BJ8


From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Perry
Sent: Thursday, July 26, 2018 5:57 PM
To: healeys at autox.team.net
Subject: Re: [Healeys] Interesting (?) Photos



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…


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




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.






-----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



-----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.











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