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Thread: chop top mk2

  1. #1741
    Official RnS Addict chop top mk2's Avatar
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    running new gauges so i guess there not matched.

    one thing i have changed is the coolant, it had a very weak mix with antifreeze but now has the proper amount in. been told that will help cool it a little. dont know if thats true or not.

    i took the stat out as i was not sure it was working, thought it would not effect the running temp.
    Last edited by chop top mk2; 27-05-2017 at 22:10.

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    Official RnS Addict mygasser's Avatar
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    have you any way of accurately checking the temp'? i had a big block fairlane a few years back, always ran a bit on the hot side. i did all sorts and eventually stumped up for a massive ally rad from sercks. still the same. got a digital probe and the gauge was reading hotter than the engine actually was. the rad looked pretty though.......
    re the stat, without it the coolant can flow though the rad' too fast so isn't in there long enough for the rad' to do it's job transferring heat to the air flowing through it. maybe fit a 'stat with the middle cut out so it 'thinks' the 'stat is open all the time but slows the flow a bit.
    need a job done on your project? i may be able to help.

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    Rods 'n' Sods Junkie 69 ford's Avatar
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    Needs to be road tested for an accurate assessment of running temperature, ie load on the engine will create more heat and airflow will reduce heat etc. also consider the rad cap pressure rating.

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  6. #1744
    Official RnS Addict chop top mk2's Avatar
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    cheers guys for the advice it,s much appreciated,

    i think the rad is to small. its a sierra cosworth one with a 50mm core. going to order a bigger rad and as you say mygasser put a stat back in and i hope that will sort the problem.

  7. #1745
    Rods 'n' Sods Junkie NZNick's Avatar
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    Brilliant car and attention to detail

    Another point to consider is somewhere for the air that's gone through the radiator into the engine bay to escape from.

    You need a space (or spaces) the same as the area of rad, so air in = air out, so no pressure build up under the bonnet which would reduce airflow through the rad.


  8. #1746
    Official RnS Addict chop top mk2's Avatar
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    cheers NZNick, glad you like it.

    mate of mine today said that if i run pure green antifreeze it would help lower engine temp, anyone tried it. he also said that as the engine has been rebuilt with new bits its bound to run a little hot untill it beds itself in.

    just had a full 3 days on it and have made alot of progress, dash is now in and wired, windows all fitted.

    few pics from today












  9. #1747
    Administrator blackpopracing's Avatar
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    Pure antifreeze wont help - it will make it worse.
    antifreeze helps engines run cooler but only at the recommended mix (I forget but its about max 50% water 50% antifreeze). You need to run a stat, no drilling holes or removing the middles - just a proper stat. You can get different temperature ones so its worth looking up what the factory ones are first and possibly picking one a little lower in temp.
    New engines are usually tight and will run a little hotter, but if you have a infra red thermal reader see what the radiator is actually reading.

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    I don't run a thermostat in my Cortina as I have an electric water pump i.e. as soon as the engine reaches temperature turn the pump on, If it starts to get above 140 then turn the fan on, works fine. This also allows me to rapidly cool the motor between rounds by leaving the pump and fan running for a few minutes with the engine off, when it was on the road I had a VW Sirrocco ally rad and thermostat fitted which worked ok but I did cut some vents in the bonnet to improve airflow which improved things.
    Its all trial and error really.

  11. #1749
    Rods 'n' Sods Junkie NZNick's Avatar
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    You could always try a 'water wetter' like redline coolant additive, Demon Tweeks do it

  12. #1750
    Official RnS Addict chop top mk2's Avatar
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    never even heard of 'water wetter' just ordered some. cheers NZNick,

    you never know it might just help.

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