New thermostat doesn't have a hole on the flange, should it be drilled or left alone? What size drill bit?
Do I Need To Drill A Hole In New Thermostat?
Started by
ricekikr
, Dec 04 2012 03:02 PM
9 replies to this topic
#2
JonnyBMX
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Posted 04 December 2012 - 03:05 PM
by this do you mean to holes that are used to retain it onto the head?
#3
ricekikr
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Mini Mad
Posted 04 December 2012 - 03:28 PM
I mean the bleed holes on the thermostat itself. Stock has one bleed hole. Something like this.
#4
tiger99
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Posted 04 December 2012 - 03:30 PM
I think he means the hole in the thermostat itself which allows some water to flow before it opens, and incidentally does assist with getting air out of the system when you first fill it. Some people used to drill them 1/4 inch, others 5/16". It is not all that critical.
Edit - almost simultaneous post, and those holes look perfectly ok.
Edit - almost simultaneous post, and those holes look perfectly ok.
Edited by tiger99, 04 December 2012 - 03:31 PM.
#5
Bungle
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Posted 04 December 2012 - 03:51 PM
does the head have a bypass hose fitted ?
#6
ricekikr
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Mini Mad
Posted 04 December 2012 - 03:56 PM
Edit - almost simultaneous post, and those holes look perfectly ok.
Got the pic from Google for a different car I think.
does the head have a bypass hose fitted ?
Yup. It's the hose connected on top of the front part of the head on the tranny side right?
#7
Bungle
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Posted 04 December 2012 - 04:01 PM
about an inch long and goes between the water pump and the head
#8
Wise Old Elf
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Posted 04 December 2012 - 05:39 PM
Those holes are not standard. We used to drill them if the car was running hot to increase the flow.
Now you would just buy a better radiator with a more cores but back in the days before the internet we only had standard rads.
Now you would just buy a better radiator with a more cores but back in the days before the internet we only had standard rads.
#9
Cooperman
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Posted 04 December 2012 - 08:10 PM
If running a engine with the heater valve at the clutch end of the engine and no by-pass hose, then it is good to drill a few holes in the thermostat flange to permit flow during warm-up. If a by-pass hose is fitted then the holes are not necessary.
The standard radiator should be adequate for all except, perhaps, full-race engines. If a Mini overheats then there is a problem somewhere in the cooling system.
The standard radiator should be adequate for all except, perhaps, full-race engines. If a Mini overheats then there is a problem somewhere in the cooling system.
#10
racingbob
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Posted 04 December 2012 - 08:39 PM
If running a engine with the heater valve at the clutch end of the engine and no by-pass hose, then it is good to drill a few holes in the thermostat flange to permit flow during warm-up. If a by-pass hose is fitted then the holes are not necessary.
The standard radiator should be adequate for all except, perhaps, full-race engines. If a Mini overheats then there is a problem somewhere in the cooling system.
would it not take longer to warm engine up and make engine run cooler as well
mine only runs at 70 but warms up in traffic
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