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Heater Outlet Coolant Flow


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#1 unburntfuelinthemorning

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Posted 16 August 2019 - 09:31 AM

I'd like to allow coolant to flow from the heater outlet on the the head to help keep no. 4 from running too hot.  I can't work out the best way to plumb this.  I need a heater but I want to be able to shut off the coolant to the heater in hot weather. 

 

How can I allow coolant to flow out of the heater outlet in the head whilst having the coolant supply to the heater shut off and where do I plumb the coolant back in which comes from the heater outlet?

 

If I plumb it back into the bottom hose then I'm bypassing the radiator and putting hot water back into the engine.  If I plumb it into the top hose then I'm bypassing the thermostat and increasing warm up time.



#2 nicklouse

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Posted 16 August 2019 - 09:45 AM

the MPi had this set up. with the switch on the heater unit and an extra hose on the bottom hose assy that allowed the flow to go back into the bottom hose.

 

I have an image of the MPi cooling system I can post later.



#3 KTS

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Posted 16 August 2019 - 09:59 AM

IIRC project Binky (..relatively recent episode..) used a two way heater switch/tap from ?a ford? that either fed the heater matrix or fed straight back to the engine coolant circuit.  obviously there was some fettling involved  :lol:

 

of the two options - i'd feed back into the bottom hose...



#4 mtjm

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Posted 16 August 2019 - 12:02 PM

I've used a heater valve from a TX2 Taxi in mine. It's a bypass valve, so then you shut off flow to the heater it flows directly in to the bottom hose. Looks like this: tx2_heater_valve_new_1.jpg



#5 Ethel

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Posted 16 August 2019 - 12:05 PM

Ford Fiestas had a diverting solenoid valve. They're all over Ebay so maybe not the most reliable item. Plenty of later Minis* did it by just sticking a restriction in the heater bypass.

 

* any with 2 branches off the bottom hose.



#6 unburntfuelinthemorning

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Posted 16 August 2019 - 12:14 PM

the MPi had this set up. with the switch on the heater unit and an extra hose on the bottom hose assy that allowed the flow to go back into the bottom hose.

 

I have an image of the MPi cooling system I can post later.

That would be helpful, thanks.



#7 unburntfuelinthemorning

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Posted 16 August 2019 - 12:15 PM

I've used a heater valve from a TX2 Taxi in mine. It's a bypass valve, so then you shut off flow to the heater it flows directly in to the bottom hose. Looks like this: tx2_heater_valve_new_1.jpg

Yes I've seen them and wondered if they'd be useful.



#8 unburntfuelinthemorning

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Posted 16 August 2019 - 12:18 PM

Ford Fiestas had a diverting solenoid valve. They're all over Ebay so maybe not the most reliable item. Plenty of later Minis* did it by just sticking a restriction in the heater bypass.

 

* any with 2 branches off the bottom hose.

What is this restriction you speak of?  Is there a part number for it?



#9 nicklouse

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Posted 16 August 2019 - 12:30 PM

 

Ford Fiestas had a diverting solenoid valve. They're all over Ebay so maybe not the most reliable item. Plenty of later Minis* did it by just sticking a restriction in the heater bypass.

 

* any with 2 branches off the bottom hose.

What is this restriction you speak of?  Is there a part number for it?

 

basically a tube with an ID of about 8mm to try and reduce the flow.

 

never bothered with one in the past.



#10 nicklouse

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Posted 16 August 2019 - 12:33 PM

 

the MPi had this set up. with the switch on the heater unit and an extra hose on the bottom hose assy that allowed the flow to go back into the bottom hose.

 

I have an image of the MPi cooling system I can post later.

That would be helpful, thanks.

 

have a look at this

http://www.theminifo...om-or-top-hose/






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