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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sat Mar 11, 2017 8:08 am Post subject: Coolant Temperature Gauge for new 912 Cylinder Heads |
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I fly an Allegro 2000 E-LSA with a Rotax 912 UL engine. I had to have the new cylinder heads put on my engine. Since the new temperature sensor in the heads now measures the actual coolant temperature rather than the actual cylinder head temperature, and the max coolant temperature limit for the 50/50 water glycol mix is 120 degrees C, I am trying to determine if the following Cockpit VDO Temperature Gauge will be compatible with the temperature sensor that is in the new cylinder heads:
VDO Temperature Gauge
Part # 310-915
Temperature Range 120F-300F / 50C-150C
Gauge requires VDO Ohm range of 10 to 180 Ohms
12 Volts
The attached curve is the performance curve for the Rotax sensor in the new heads. I am not an electrical guru and am not sure the above stated gauge is compatible with the Rotax sensor and will indicate the correct coolant operating temperature. Is there anyone out there that has the new cylinder heads, and if so, what type gauge are you using to indicate the coolant temperature in the cylinder head? Is the above gauge the correct gauge for this application? Thanks for your help.
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net
http://www.wwegeo.com
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Mar 12, 2017 6:24 am Post subject: Re: Coolant Temperature Gauge for new 912 Cylinder Heads |
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Hi Hugh,
You shouldn't have any problem, but I will say it would be preferable that your gauge had a lower limit. Your lower limit of 120F will make it harder to see the lower scaled coolant temps.
Maybe something more along this line:
https://www.egauges.com/280F-140C-Water-2-1-16-p/310-911.htm
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Sun Mar 12, 2017 12:04 pm Post subject: Re: Coolant Temperature Gauge for new 912 Cylinder Heads |
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Roger,
Thanks for your reply. Why do I need to be concerned about the lower CH coolant temperatures? The only difference in the scale readings between the two gauges on the lower side is 10 degrees C (40 to 50 degrees C). Also I note on the 310-911 gauge information that it is for use with a Stewart Warner sender. That statement is not on the 310-915 gauge information. Do you know what sensor (sender) Rotax uses in the new Cylinder heads? Would either gauge be compatible?
Hugh McKay
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Mar 12, 2017 1:19 pm Post subject: Re: Coolant Temperature Gauge for new 912 Cylinder Heads |
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Hi Hugh,
You can stick with yours. I was just thinking a wider set of numbers on the gauge would open the numbers up some and not have the bottom number right at 120F. You're right about the 310-911 as it wouldn't match the VDO sender, but something along that line that would match would be just fine.
Stick with what you have for a while and see how you like it.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Last edited by Roger Lee on Sun Mar 12, 2017 3:14 pm; edited 1 time in total |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Sun Mar 12, 2017 2:48 pm Post subject: Re: Coolant Temperature Gauge for new 912 Cylinder Heads |
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Roger,
Don't you mean the 310-911 would not be compatible?
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Mar 12, 2017 3:14 pm Post subject: Re: Coolant Temperature Gauge for new 912 Cylinder Heads |
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Typo fixed.
| | - The Matronics RotaxEngines-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:
http://www.matronics.com/Navigator?RotaxEngines-List |
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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