[Healeys] Overheating

[Bob Spidell]

Anyone tried a smaller diameter pulley on the pump?


On 3/6/2021 4:49 PM, Simon Lachlan via Healeys wrote:
>
> Using an original type stat helps too ie the one with a sleeve. Helps, 
> not cures all.
>
> Simon
>
> *From:*Healeys <healeys-bounces at autox.team.net> *On Behalf Of 
> *warthodson--- via Healeys
> *Sent:* 06 March 2021 23:41
> *To:* rfbegani at gmail.com; michaelsalter at gmail.com; 
> bspidell at comcast.net; healeys at autox.team.net
> *Subject:* Re: [Healeys] Overheating
>
> It seems to me that switching from a 7 PSI radiator cap to a 15PSI cap 
> is not a solution to an overheating problem but rather a band-aid.
> Gary Hodson
>
> -----Original Message-----
> From: rfbegani at gmail.com <mailto:rfbegani at gmail.com>
> To: 'Michael Salter' <michaelsalter at gmail.com 
> <mailto:michaelsalter at gmail.com>>; 'Bob Spidell' <bspidell at comcast.net 
> <mailto:bspidell at comcast.net>>; 'Ahealey help' <healeys at autox.team.net 
> <mailto:healeys at autox.team.net>>
> Sent: Sat, Mar 6, 2021 3:58 pm
> Subject: [Healeys] Overheating
>
> Bob & Mike:
>
> You both may have seen my requests on overheating of my BJ8 and the 
> response from the group.  As a result, I purchased an infrared 
> thermometer to determine if my water gauge was giving accurate 
> readings.  The thermometer gun told me that my water gauge was 30 
> degrees higher than the temperature of the sensor attached to the 
> block.  At the same time, I noticed my gauge will show 120 degrees at 
> rest instead of going down to 90 degrees which would indicate a 
> 30-degree high reading.  In May when I leave for cool Michigan, I will 
> send the gauge to Nisonger to be rebuilt.
>
> I began to test the temperature of the water going through the cooling 
> system at the inlet to and outlet from the block, inlet and outlet to 
> the radiator and the upper and lower hoses while the engine is running 
> at idle and at 2-3 Thousand rpm.  The chart I created to record these 
> temperatures allowed me to produce observations or averages because 
> the flow of the water is dependent upon the rpms of the engine.  The 
> engine has overheated all of the 40 years I have owned it and has only 
> 1000 miles on the new speedo since rebuilding to 20 over.
>
> At the radiator inlet 134 outlet 85 at high rpms with electric fan 
> operating.
>
> inlet 103 outlet 94 at idle rpms with electric fan operating.
>
> The above temperatures are recorded at the inlet and all along the hoses.
>
> These temperatures indicate the pump is circulating water with 
> sufficient gallons to cool the engine only when the engine is at high 
> rpms.  At idle the pump does not circulate sufficient water to keep 
> the engine cool.  This is especially true when you have been operating 
> the engine at high speed and come down to 30 – 40 mph and stop and go 
> traffic.  Maybe the real answer is to install an electric pump for 
> constant cooling water?
>
> In the past week, I have installed a large Dorman coolant recovery 
> tank and a new 7 psi 1 inch radiator cap because I learned that our 
> radiators have a long neck.  Both those changes have reduced my 
> problem of very high overheating and resulting boiling over.  In 
> addition, when my water gauge shows 212 degrees the water temperature 
> is actually 30 degrees less or approximately 185 degrees.  Also, I am 
> not boiling over and loosing coolant.  Nevertheless, the engine water 
> temperature is still spiking to 210 plus degrees true when coming off 
> highway speeds.
>
> In my review of various sites, the radiator equipment suppliers and 
> others are recommending increasing the pressure in the classic car 
> systems to 15 psi plus, and coolant recovery tanks “if your coolant 
> system, radiator, hoses etc. is new” and therefore can hold the 
> pressure.  Unfortunately, I have not found any maker of a 1 inch depth 
> x 2.33 inch diameter radiator cap except our 7 psi cap so I can try 
> such a pressurized system.
>
> Another suggestion on an older discussion at the British Car Forum 
> indicated some of the Ontario car owners had switched to Evans 
> Waterless Coolant rather than 50/50 coolant water mixture.
>
> I still have no idea why a minority of our group has overheating 
> problems.  More ideas?
>
> Regards,
>
> Bob Begani 67 BJ8
>
>

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