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Cooling Bypass (Again)


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#1 Chris5798

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Posted 12 August 2018 - 11:24 PM

Hullo all.  I have acquired a modified 1991 Mainstream Cooper 1275 (HIF 44 carb).  Among other things, the heater has been removed.  The sandwich plate heater outlet is blanked off.  The water pump has the bypass hose flange (so not the original pump) also blanked off.  A heated manifold inlet is installed, but the water in/out pipes are not used (ie: not connected).  The thermostat has been drilled.  The car is slow to warm up.  I would much prefer to restore a proper bypass and use an undrilled thermostat.  My question - would it work if I unplugged the sandwich plate outlet and ran a hose to either the water pump bypass hose fitting (which I could unplug), or to the inlet manifold and then to the water pump bypass?  This sounds like an elegant solution to me, but it would be good to hear views before I do it!



#2 Moke Spider

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Posted 13 August 2018 - 03:08 AM

The way I have my own cars set up (and been doing it this way for over 35 years now) is similar to how yours is, only I fit a standard non-drilled Thermostat, so it can do it's job.



#3 Chris5798

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Posted 13 August 2018 - 06:34 AM

So no bypass and no drilled thermostat? No concerns about lack of circulation and hot spots before the stat opens? I have no heater so cannot use this to circulate!

#4 whistler

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Posted 13 August 2018 - 08:23 AM

The water pump is correct as there's no provision for a bypass on a '91 head.

Edited by whistler, 13 August 2018 - 08:26 AM.


#5 Moke Spider

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Posted 13 August 2018 - 08:56 AM

So no bypass and no drilled thermostat? No concerns about lack of circulation and hot spots before the stat opens? I have no heater so cannot use this to circulate!

 

None what so ever.

 

Hot water rises, Hot water will crack open the Thermostat, coolant flows, happy days.



#6 Chris5798

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Posted 13 August 2018 - 09:31 AM

The water pump is correct as there's no provision for a bypass on a '91 head.



#7 Chris5798

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Posted 13 August 2018 - 09:34 AM

Sorry, not phrased well. The pump has the bypass take-off, a previous owner has blanked it off with a bolt. So I can remove bolt and restore the take off.

Question stands - if I run a hose from the sandwich plate take off to the pump take off will it work properly as a bypass?

#8 nicklouse

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Posted 13 August 2018 - 10:30 AM

No point. Sound fine as it is. The only debate is the extra drilled holes in the thermostat.

#9 Chris5798

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Posted 13 August 2018 - 03:19 PM

Thanks all. I'll put it back together with no change and see how it goes. Maybe try a thermostat with just one small hole.

#10 nicklouse

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Posted 13 August 2018 - 06:02 PM

Thanks all. I'll put it back together with no change and see how it goes. Maybe try a thermostat with just one small hole.

the standard thermostat should have a small hole with a wiggly thing in it. that is all you need.






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