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Carb. heater block temp.

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sidsel.svein(at)oslo.onli
Guest

Posted: Sun Aug 20, 2006 11:57 am Post subject: Carb. heater block temp.

Having completed the ground testing and awaiting  CAA inspection, I have time to contemplate on one observation  made:

  

 The temp. indicator that came with Skydrive's carb.  heater blocks for 912S shows block temp increasing as the CHT readings  increase.  When reaching 50 degr. C, the indicator flashes HHH (as it is  supposed to do at this temp.).

  

 According to Skydrive's notes, the carb. heater  block temp normally is between 20 and 50 degr. C.  This is, I take it, in  flight.

  

 Here are my questions to those already flying with  this equipment:  

  

 - Do the blocks cool down when airborne  and operating the engine at normal flying loads, i.e. when the higher fuel  volume evaporation cools the carburetors from the inside?  Or does your  temperature reading always stay below 50 degr. C even when taxiing on the  ground?

  

 - Have you fitted any permanent restrictor in the  branch-off tube to the carb. heater blocks, or fitted the flow control valve  that Skydrive provides as an option, in order to keep the carb. heater block  temp. in the range mentioned by Skydrive?

  

 Best regards,

 Svein

 A225 - now in Norway

   [quote][b]

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ward.t(at)xtra.co.nz
Guest

Posted: Sun Aug 20, 2006 6:51 pm Post subject: Carb. heater block temp.

Steve,

 I disconnected the temperature gauge as it came on  above 50C degrees even when taxying. A higher 'ranged' gauge is required if  needed at all. Now use it as an OAT located in the Air Plenum chamber. Never had  a problem with the temperature of the blocks and yes, I suppose it  does vary  as the CHT varies.

 Cheers,

 Tim

  

 Tim Ward

12 Waiwetu Street,

Fendalton,

Christchurch, 8052

New  Zealand

  

 Ph +64 3 3515166

Mobile 021 0640221

ward.t(at)xtra.co.nz (ward.t(at)xtra.co.nz)

 [quote]   ---

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william(at)wrmills.plus.c
Guest

Posted: Mon Aug 21, 2006 3:28 am Post subject: Carb. heater block temp.

Svein,

 I have the flow control valve installed in my  Skydrive system which I find very useful.  Throughout the summer  months it is generally off, because, unless it is very humid, or I am passing  through cloud, I do not believe there is much risk of carb ice.   However, if it is left on in the summer, it can cause problems with fuel  vaporisation, when trying to re-start after stopping the engine for a short  while, (e.g. a fuel stop).  

 When I had my first set of carb heaters, it was  supplied with a temperature gauge as you describe, so I was able to use the  valve to control the carb temperature in the winter months to about 30 to 40  degs.  My latest heaters (with my new engine) do not have the drilling for  a probe, so I have to guess how much to open the valve in the winter  months.  

 If you use a change-over switch and another probe  you can have the choice of OAT or carb temp at the flick of a  switch.

 Best wishes, 

 William

 [quote]   ---

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johnwigney(at)alltel.net
Guest

Posted: Mon Aug 21, 2006 6:32 am Post subject: Carb. heater block temp.

Hi Svein,

 

 I have had the Skydrive carb heater blocks from day 1, they have been completely trouble free. After start up and during normal flying, the temp gauge flashes 'HHH'. In cold weather, the temperature indication sometimes falls below 50 deg C. I have no restrictors and no control valve, they are not necessary in my opinion.

 

 Cheers,

 John

 

 N262WF, monoXS, 912S, 500+ hours

 Mooresville, North Carolina

  [quote]

*From: "Sidsel & Svein Johnsen" <sidsel.svein(at)oslo.online.no>

*Subject: Carb. heater block temp.

*Having completed the ground testing and awaiting CAA inspection, I have time to contemplate on one observation made:

*The temp. indicator that came with Skydrive's carb. heater blocks for 912S shows block temp increasing as the CHT readings *increase.  When reaching 50 degr. C, the indicator flashes HHH (as it is supposed to do at this temp.).

*According to Skydrive's notes, the carb. heater block temp normally is between 20 and 50 degr. C.  This is, I take it, in *flight.

*Here are my questions to those already flying with this equipment:  

*- Do the blocks cool down when airborne and operating the engine at normal flying loads, i.e. when the higher fuel volume *evaporation cools the carburetors from the inside?  Or does your temperature reading always stay below 50 degr. C even when *taxiing on the ground?

*- Have you fitted any permanent restrictor in the branch-off tube to the carb. heater blocks, or fitted the flow control *valve that Skydrive provides as an option, in order to keep the carb. heater block temp. in the range mentioned by *Skydrive?

*Best regards, Svein A225 - now in Norway[b]

- The Matronics Europa-List Email Forum -

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sidsel.svein(at)oslo.onli
Guest

Posted: Mon Aug 21, 2006 9:22 am Post subject: Carb. heater block temp.

To all who responded so quickly to my  question:

  

 Thank you very much!

  

 Best regards,

 Svein

  

   [quote][b]

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mau11(at)free.fr
Guest

Posted: Mon Aug 21, 2006 10:04 am Post subject: Carb. heater block temp.

Hello John,

 I am builder 145 with 912.

 Sometimes when I fly with humidity athmosphere or rain, I have splutt  engine, I don't like!!!

 After 100 hours I install skydrive carb heater blocks since now  3 years, there is no trouble no problem, original thermometer  dont goe's up to 50°C.

 I change this model by another identical but with temp range between -  35° to 110°C, all is ok, the average temp during engine running is about 60 to  70°C. 

 I confirm there is no restrictor installed, the restrictor is only for  vapour lock, into the return line to the tank. 

 I install also a manual valve near the main fuel valve, because when I shut  the return fuel line my fuel flow give me the exact fuel  consumption. 

  

 Michel AUVRAY

 Europa N°145 > 300 hours flight

   

 Hi Svein,



I have had the  Skydrive carb heater blocks from day 1, they have been completely trouble free.  After start up and during normal flying, the temp gauge flashes 'HHH'. In cold  weather, the temperature indication sometimes falls below 50 deg C. I have no  restrictors and no control valve, they are not necessary in my  opinion.



Cheers,

John



N262WF, monoXS, 912S, 500+  hours

Mooresville, North Carolina



[quote]*From: "Sidsel & Svein Johnsen" <sidsel.svein(at)oslo.online.no> (sidsel.svein(at)oslo.online.no)

*Subject: Europa-List: Carb. heater block temp.

*Having completed the ground testing and awaiting CAA inspection, I have time to contemplate on one observation made:

*The temp. indicator that came with Skydrive's carb. heater blocks for 912S shows block temp increasing as the CHT readings *increase.  When reaching 50 degr. C, the indicator flashes HHH (as it is supposed to do at this temp.).

*According to Skydrive's notes, the carb. heater block temp normally is between 20 and 50 degr. C.  This is, I take it, in *flight.

*Here are my questions to those already flying with this equipment:  

*- Do the blocks cool down when airborne and operating the engine at normal flying loads, i.e. when the higher fuel volume *evaporation cools the carburetors from the inside?  Or does your temperature reading always stay below 50 degr. C even when *taxiing on the ground?

*- Have you fitted any permanent restrictor in the branch-off tube to the carb. heater blocks, or fitted the flow control *valve that Skydrive provides as an option, in order to keep the carb. heater block temp. in the range mentioned by *Skydrive?

*Best regards, Svein A225 - now in Norway[b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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ami(at)mcfadyean.freeserv
Guest

Posted: Mon Aug 21, 2006 1:10 pm Post subject: Carb. heater block temp.

By way of comparison, my carb body temps (i.e. as  measured on the outside of the venturi, not on the heater block) have run at  between 23C and 53C between the hottest and coldest days of UK operation over a  period of 5 years; the latter temperature being untypical and during the recent   record July temperatures of 30C+.

  

 But I don't have the Skydrive carb heater  fitted.

  

 Rather, I have the Classic style of rear exhaust  header, where the exhaust pipe passes quite close to the carb. Also, carburettor  air is taken from under the cowl, not from outside, which is undesirable on two  counts, but I have never experienced carb icing.

  

 Temperatures go up during taxiing, down during  flight. Hot starting can be a problem with Mogas.

 Next trick is to see what temps. are experienced  with external air.

  

 Duncan McF.

 [quote]   ---

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