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Thread: Coolant Temperature Falco 00

  1. #1
    apriliaforum newb
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    Coolant Temperature Falco 00

    Good Day,
    I recently baught a Falco from 00 with 55000 km. The Bike runs great and has addictive pull from down low.
    So far so good. Coolant is full and the engine heats up quickly from cold to 64C.
    I noticed that the engine coolant temperature is around 65 to 73 C (149 -164 F) while driving on the road. It increases to over 90C (194F) in town or in heavy traffic. But as soon as I continue driving it drops to 65 to 73 C (149 -164 F).
    I found out that at 65C the termal expansion valve opens and is supposed to start routing the coolant trough the radiators. From 80C and above all the coolant should flow through both radiators.

    Is this normal? We have around 12C (54F) here.

    Should I check the termal expansion valve?

    Thx

    Andreas from Berlin Germany
    Last edited by chili023; 05-13-2019 at 07:40 AM.

  2. #2
    apriliaforum expert kzmille's Avatar
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    Yes, sounds normal.
    This is America. Use your turn signals or WE WILL KILL YOU - remember Sandra Bland

  3. #3
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    Thanks.


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  4. #4
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    Hi, I had a long drive yesterday and the bike runs great.
    Is there a reason why the 1000 V twin engine runs so cold?
    Does it have problems with heat seazere?
    The cold coolant temperature will not help the fuel economy?

    Just wondering.

    Greetings A.

  5. #5
    apriliaforum expert kzmille's Avatar
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    Quote Originally Posted by chili023 View Post
    ...Is there a reason why the 1000 V twin engine runs so cold?...
    That's funny. Most here complain about them running so hot.

    Early Mille's were fitted with a cooler thermostat. Some like to fit these to other year bikes thinking it will lower engine temps. It is possible a previous owner did this. 164 is a bit cooler than My 01 mille runs on the road even on a cold day. I don't know if the thermostats have the part number on them. Could be worth checking it and testing. There is a procedure in the service manual for testing.
    This is America. Use your turn signals or WE WILL KILL YOU - remember Sandra Bland

  6. #6
    apriliaforum newb
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    Well runing with 65 to 75 C is quite cold (modern turbo engines run 110C in low loads). This would increase thermal losses in the expansion stroke and reduce power and fuel economy. One would only do that if the engine has problems with heat spots on the liner or head.
    So I just wonder why aprilia would do that. Especially while reading that there is a turbo boosted rotax v2 1000cc with no reduction of compression ratio. This means the engine is thermally quite happy.
    I think people are complaining about hot engines in traffic or slow city riding?!
    Anyway I will check the thermostat in the fall, and maybe fit an electrical pump which kicks in to prevent overheating in summer and heavy traffic. A small pump and a bypass should do.

    Thanks @kzmille

  7. #7
    apriliaforum expert ned's Avatar
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    My falco runs at 77 degrees at a steady 5-7thou in any gear . Rises a couple of degres on boost but my fans kick in at 82 degrees with an aftermarket temp switch so at the lights they are always on . However i have a bypas on off switch to stop un necessasary cooling and batery drainage.
    As far as i am aware its normal for a falco to reach +90 before the fans kick in.
    My low comp engine has had no effect on cooling and i have no oil cooler
    Last edited by ned; 05-18-2019 at 02:38 AM.

  8. #8
    apriliaforum newb
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    @ned: Thanks
    do you have a Part number for that switch?

    Greetings A.

  9. #9
    apriliaforum expert JCG's Avatar
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    It's just a simple switch that you mount inline with the coolant sensor wires. Mount it wherever you like. I've been using one for a few years ever since my sensor failed; I have another, but the switch was easier. Need cooling? Flip the switch..... I only use it when sitting at lights in town.
    Chris
    What kind of bike is that?
    It's an Aprilia!!!
    Who makes them?
    .......... lets go of clutch lever.

  10. #10
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    I meant the aftermarket temp switch that kicks in at 82C

  11. #11
    apriliaforum expert JCG's Avatar
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    Oops, my bad! A little bit of recency effect going on there.
    Chris
    What kind of bike is that?
    It's an Aprilia!!!
    Who makes them?
    .......... lets go of clutch lever.

  12. #12
    apriliaforum expert ned's Avatar
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    No mate it was just a cheap item off ebay.
    Bit of a pain in the arse really it comes on at 82 and stays on so i have to over ride the switch and turn fans off. Id rather have a normal switch and turn fans on with switch for extra cooling.
    My aftermarket switch didnt even have the same thread so i sealed it to the manifold with epoxy.

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