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Aircooled Engines Overheat at Long Idle?

Discussion in 'Chat & Tech Info' started by Pspice, Mar 16, 2019 at 12:50 AM.

  1. Pspice

    Pspice Just got it firing! GT Site Contributor!

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    Hello forum,

    Generally, do air cooled engines need to be turned off when idling for prolonged periods at stop? Especially cylinders inline with frame (essentially 90% of the other v-twin placement configurations)?

    What about the Moto Guzzi V7i-ii (stock) or other larger Guzzi motors (Griso, Cali, Audace, etc)? Im sure ambient air temps matter but I really have no idea since the bike does not have an engine temp gauge (i know, no coolant).

    I've contemplated if I need to shut my engine down when stopped at a red light.

    Appreciate some wisdom and education!

    Happy St Patty's Day weekend
     
  2. V700Steve

    V700Steve High Miler GT Contributor

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    I don't think there is any need to be concerned about overheating unless it is in heavy traffic stops of more than traffic light times. One reason to use the 10/60, it sheds heat.
    If you are worried about the temp, they sell screw in temp gauges for dipstick.
     
  3. vagrant

    vagrant Cruisin' Guzzisti GT Contributor

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    A mag. (Mcn i think) Did an article years ago proving that at each firing of the cylinder the heat radiates out through the cylinder fins. When you shut it off the piston and cylinder cool at different speeds causing mini seizures of the piston. So don't shut it down unless it's going to be a long wait like for a train.
     
  4. GT-Rx®

    GT-Rx® Administrator Staff Member

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    You do not need to shut off your engine at stop lights under normal circumstances. High heat days while sitting in traffic may cause overheating, where the motor will run poorly. Best to shut them off in that situation. The worst thing people do is to start and let them idle for extended times sitting still. Modern engine designs are best to start, and once the oil has begun circulating (for all of about 5 seconds), go.
    Those oil sump temp gauges Steve talks about above will scare you. Don’t do it. ;)
    That and most of the steel rod designs snap off and drop into the motor. I’m not a fan for both of those reasons.
     
  5. Pspice

    Pspice Just got it firing! GT Site Contributor!

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    Thank you for the insights.

    Very much appreciated.
     
  6. GT-Rx®

    GT-Rx® Administrator Staff Member

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  7. Pspice

    Pspice Just got it firing! GT Site Contributor!

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    Thank you Todd. As a matter of fact, you installed one on my motorcycle not too long back.

    I agree that the larger oil capacity and integrated fins help keep fluid temps from getting out of control and prolong oil change intervals.

    No leaks! You and your staff's workmanship is great!
     
    GT-Rx® likes this.

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