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Thread: 4age engine temp and warm up time.

  1. #1
    Senior Member odessy's Avatar
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    Default 4age engine temp and warm up time.

    Car - ae86

    motor / part in question - 4age 16v bigport, rebuilt approx 60000km's ago.

    problem - Rapid warm up time (<5mins)

    occurs/started when (if applicable)-

    personal situation (if applicable)- Was wondering how long people's engines normally take to warm up and where the needle usually sits on the stock gauge once it does.

    I noticed that my car takes around 3mins to get up to temperature, needle sits slightly past the first verticle line on the "M" in temp on the stock temperature gauge, also have an aftermarket temp gauge which sits at 89ish Celsius. The temp has only started to rise above this once when I was giving it a thrash up a mountain, slowly rose to just under 100 until I backed off and it dropped back down. Is this reasonable, I did a search and 82 seems to be the normal?

    The engine is running the FWD cooling system with modded piping, not sure on the radiator. Has an electric fan which turns on as soon as the ignition is on and shroud as well as an oil cooler. Radiator is full and has green coolant. OEM temp sender is on the top radiator inlet and the aftermarket one is screwed into the block under the extractors, faulty reading?

    Only just talked to the previous owner then to get this information but will go down in the morning and check the exact location/setup.
    Last edited by odessy; 29th October 2011 at 02:55 PM.

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    Stock sensor blew caused leaks, replaced with a tridon one didn't read at all - either was at 0 or max constant no matter.
    Aftermarket sits on 80 with thermals on, thrashing.
    2-3 minutes and its idling warm.

  3. #3
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    3-4 Minutes of normal driving (Sub 3k)
    Unknown sensor presumably stock, aftermarket alloy radiator.
    Needle sits just a fraction before halfway

  4. #4
    Veteran timbo's Avatar
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    Default

    Sounds about right. Mine used to to take ages before the rebuild, I assume that the water galleys were clogged up fairly bad.

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    Senior Member odessy's Avatar
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    Just went and had a look at it and took it for a drive to see where the OEM needle sits as I usually look at the aftermarket temp gauge, updated my original post. OEM needle sits a little past vertical (just past the first vertical line of the 'M' in TEMP). If by halfway people are reffering to vertical and normal being just below vertical as I have noticed to be the norm in a few cars, as well as aftermarket running at 89C vs low 80's then it is running a little warm?

    First thing I thought to start with was whether or not my temp senders are in the correct location and giving an accurate reading? Just to make sure Im looking at the right thing, these are what I believe to be the temp readers, the one on the water inlet is the OEM and the one screwed into the block next to the oil filter is the aftermarket. I do have a some doubt on the aftermarket location, but I would think the OEM to be in the correct spot?

    Going for a drive sunday night so will be cautious and see if the temp starts to rise further.
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  6. #6
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    What your saying seems fine to me.

    The factory needle sits fine on the M,

    Your warm up time seems fine,

    Having a sensor in the block for water, the temp will rise and fall with higher rpm driving, its where most of the heat is isnt it??

    If in doubt change the thermostat, run a good qual radiator flush and try again, i wouldnt worry too much about temp increases during spirited driving, Unless your up around the 110deg mark.

    Thermo fan on constant is what some consider a no no aswell, pulls too much current & burns the fans/fans out + added load to the alternator and engine.

    Also if your fuel is alittle lean then this creates extra heat aswell.

  7. #7
    Senior Member odessy's Avatar
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    Yeah that was my next concern/question. Thanks for the pre-emptive answer . Ill just keep an eye on it and make sure its not getting too hot to easy. Might give the system a flush and check the thermostat/get a new one in the near future or if it starts to get worse.

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