wilkingj
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| posted on 29/3/09 at 07:42 AM |
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Engine Temp affected by Antifreeze??
I am having a senior moment here.
I have have an ongoing tappet rattle on my Rover V8. Finally sorted it with a set of new tappets.
Anyway, having refilled it with water and antifreeze, it is now running about hotter than it was before.
For the last 3 years it has been running at 170F (on the gauge). Now it had moved up to 190F (87C).
I have the antifreeze at 50:50, whereas before I think it was only 33:1
Does the team think this would make that much difference to the working temperature?
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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Litemoth
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| posted on 29/3/09 at 08:17 AM |
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I think most Antifreeze is meant to work as a 'coolant' as well as the ant-freezing bit. That is, you'd expect your cooling system
to be more efficient and cooler if anything but your thrmostat should be regulating water flow so that it maintains a set temperature whatever you
have as a coolant.
If your thermostat is wide open (test) then there could be a ...blockage, short cicuit, or...I'd be looking down the AIRLOCK avenue for a
solution. .....here we go.
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flak monkey
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| posted on 29/3/09 at 08:34 AM |
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Nope, its actually the other way around. Antifreeze actually decreases the cooling efficiency of water. We only use it to prevent corrosion and
decrease the freezing temp of water it has a negative on cooling...
David
Sera
http://www.motosera.com
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britishtrident
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| posted on 29/3/09 at 08:47 AM |
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The term Antifreeze covers a lot of chemicals old methanol based antifreezes were not very effective coolants. Glycol based antifreezes are very good
heat transfer mediums, although the specific heat capacity is lower than water the film coefficients are better.
87 c is about spot on where your engine should be running unless something is wrong the running temperature is really governed only by the
thermostat.
On the subject of hydraulic tappets oil quality is really critical I can also highly recommend using Wynn's Hydraulic Valve Lifter additive to
keep the tappets from sticking in future --- it works wonders on Vauxhalls which are very prone to stuck hydraulic tappets.
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Danozeman
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| posted on 29/3/09 at 09:17 AM |
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I would say 87 is about where u wanna be anyway Geoff.
But yes as stated the concentration of anti freeze will affect the cooling slightly but mainly controlled by the thermostat.
I normally run 70:30 ish. You wont get cold enough over hear to need 50:50 concentration.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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britishtrident
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| posted on 29/3/09 at 10:42 AM |
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With ethelene-glycol antifreeze even 10% will protect down to -8c, actually a bit more than that as the ice crystals formed in a water-antifreeze mix
tend to be slushy rather than solid. The eutectic (lowest frezing point mixture) is a 60/40 solution which will protect down to -60 c -- but if
you go above 80% antifreeze the freezing point rises rapidly.
Main reason manufacturers recommend 50/50 is extra corrosion protection --- 50/50 protects down to -40c (by coincidence -40f in old money)
[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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britishtrident
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| posted on 29/3/09 at 10:46 AM |
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I forgot to add 50% glycol antifreeze solution boils at 107c
[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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wilkingj
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| posted on 29/3/09 at 08:04 PM |
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Thanks. thats all good info. Also being an all alloy engine (Rover V8) I was erring more on the anti corrosive quality.
I may well have an airlock, although I dont think so. Car needs more driving to test (well thats my excuse).
Still I have fixed that rattly tappet... which was really bugging me.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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