Edelbrock Performer erratic water temperature

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Homewood
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Thu Oct 31, 2019 11:46 am

Just put a thermostat in as it runs too cold in winter.
Same expansion tank as mine above. Will have a drive later maybe it'll work as a birthday present today !

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Migge
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Re: Edelbrock Performer erratic water temperature

Post by Migge » Thu Oct 31, 2019 12:41 pm

I just wanted to show that it has filled up only 1/2 way. Of course mine is at the highest point mounted :-)
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clive
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Re: Edelbrock Performer erratic water temperature

Post by clive » Thu Oct 31, 2019 1:23 pm

Looking at the photographs, it doesn't make sense to me. Is this the same set-up as other Rover engined 289s?
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Thu Oct 31, 2019 1:54 pm

It's what I found on internet but it could be wrong ?

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Migge
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Re: Edelbrock Performer erratic water temperature

Post by Migge » Thu Oct 31, 2019 2:31 pm

It seems that you have a heater mounted. As far as I know goes one hose from the waterpump into the heater and one hose from the waterpump is connected to the manifold front and from the manifold back to the heater. But that depends on the manifold. Some use a tube under the manifold.

What I can see on your pics is that you have from the waterpump hose to the heater an additional connecting to the Harrison tank, bottom tube. The bottom tube of the Harrison or any other expansion tank should be connected to the bottom hose of the radiator.

I have no heater and my waterpump tubes are blanked.
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Homewood
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Fri Nov 01, 2019 10:59 am

Migge Been doing some reading and yes it would appear the bottom hose of the Harrison header tank should go to the bottom hose of the radiator just before the water pump. So first thing to do is buy a tee piece for the bottom hose and plumb correctly.

But do I need an expansion tank as well ? Found a good explanation from car builder solutions https://www.youtube.com/watch?v=OPKaFcOwemI

Homewood
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Fri Nov 01, 2019 12:14 pm

Just had another look and I can't see why moving the bottom hose coming from Harrison header tank to 6 inches before pump housing will make any difference ? I understand from car builder solutions it must be as close to the water pump as possible which is where the current return is it uses the same return as the heater just before the pump.
Also why did I never get any issues with the thermostat removed apart from running very cold.
Surely it must be an air lock ?
Or do I need to put an expansion tank off the neck of the header tank (overflow pipe) ?
Very weird ???

Homewood
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Fri Nov 01, 2019 12:15 pm

IMG_20191101_120524236.jpg
IMG_20191101_120542564.jpg
IMG_20191101_120556239.jpg
These pics may show the plumbing more clearly.

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clive
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Re: Edelbrock Performer erratic water temperature

Post by clive » Fri Nov 01, 2019 1:16 pm

I don't know the coolant capacity of the Rover engine/radiator, but in the Ford it is about 12 pints. The expansion of water from room temperature to boiling point is about 4% so will require at least 1/2 pint free space to take up the expansion. If you have no thermostat causing the coolant to only reach about 80 degrees, the expansion will be a lot less and therefore less pressure in the system which will lead to less overflow.
Cheers, Clive.

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Homewood
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Re: Edelbrock Performer erratic water temperature

Post by Homewood » Fri Nov 01, 2019 3:47 pm

Think I fixed it just filled radiator again, took off top hose and filled shoved back on, turned heater valve off and temperature behaved itself. Will test drive tomorrow with heater valve on.

Think I need find some bleed valves to pity in

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