Jonte
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| posted on 11/5/11 at 05:44 AM |
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Zetec thermostat - drill a hole
A few years ago when I was doing my cooling system on my zetec silvertop I read some threads where it was recommended to drill a hole in the
thermostat.
I can´t find any of these threads and I don´t remember the benefit of that procedure. Think it was a 3-4mm hole drilled through the plate of the
thermostat.
Anyone that can confirm this or advice against this?
Click it
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austin man
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| posted on 11/5/11 at 06:38 AM |
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I believe iits to aid cooling on number 4 cylinder as this one tends to get hotter and run weaker
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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britishtrident
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| posted on 11/5/11 at 06:54 AM |
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It lets the thermostat open more quickly and aids bleeding air out when refilling, 2 x 3mm holes is about right.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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coozer
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| posted on 11/5/11 at 08:46 AM |
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Better just to plumb the system up correctly... it used to be to overcome the shortcomings of the raceline rail that moved the thermostat too far away
form the engine.
1972 V8 Jago
1980 Z750
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contaminated
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| posted on 11/5/11 at 09:50 AM |
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quote:
Originally posted by coozer
Better just to plumb the system up correctly... it used to be to overcome the shortcomings of the raceline rail that moved the thermostat too far away
form the engine.
Exactly that. Only of benefit if you use the Raceline rail like me really. If you use the rail and don't run a header tank or heater etc there
is no bypass to the thermostat. A bypass of some kind is required to let water circulate during the warm up phase until the thermostat opens. Two ways
of doing it are:
1. Drill a 5mm hole in the outer ring of the thermostat
2. Remove the inner part of the thermostat altogether
I use Option 2 above - which gives me a nice free flow of coolant, but just enough restriction during the warm up phase.
Dan
Tiger Super Six Independent
www.southernkitcars.com
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02GF74
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| posted on 11/5/11 at 10:17 AM |
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quote:
Originally posted by contaminated
2. Remove the inner part of the thermostat altogether
I use Option 2 above - which gives me a nice free flow of coolant, but just enough restriction during the warm up phase.
then surely it no longer is a thermostat but a restirctor?
I am a paid up member of the small hole in 'stat fan club but last thermostat, one for crossflow was made of hardened steels so had t use
diamond bits to grind the hole.
Also whenever fitting a new thermostat, alsways test it first !! (would have save me hundrends in a rebuild!!!  )
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contaminated
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| posted on 11/5/11 at 11:23 AM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by contaminated
2. Remove the inner part of the thermostat altogether
I use Option 2 above - which gives me a nice free flow of coolant, but just enough restriction during the warm up phase.
then surely it no longer is a thermostat but a restirctor?
Yup
Tiger Super Six Independent
www.southernkitcars.com
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mikemph
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| posted on 11/5/11 at 12:10 PM |
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The hole in the stat has one other advantage if the stat fails at least you still get a bit of flow around the block maybe enough to nurse it home
very carefully with heater turned on. I do this to any engine that will be used hard.
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Jonte
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| posted on 12/5/11 at 10:28 AM |
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Thanks for all replies
It looks lika I´m gonna drill a hole tomorrow before I put everything together 
Click it
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DRC INDY 7
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| posted on 12/5/11 at 11:26 AM |
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I have 6 little holes in mine And when we had a mgb racecar we fitting restrictor plate with holes in from Cambridge motor sport
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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