Coolant pressure and temperature

by andrew owen in 912 / 914 Technical Questions 8 years ago

Hi All, I have just acquired a Rans S7 with a 912 Ul up front, I have noticed that the coolant temp only gets to around 65/70 deg C and the pressure to 6 psi, (UK Summer) do I need to think about covering a portion of the radiator to increase the temp a little? And will that have the affect of bringing the pressure up, there are no water leakage and it is fitted with a new rad cap.I would have thought the pressure should have gone up to somewhere near the cap pressure of 1.3 bar and not the 6psi indicated on the gauge, I have tested the gauge and it reads ok.
Andy

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Re: Coolant pressure and temperature

by Roger Lee » 8 years ago

Roger Lee

131 5.38k 5.44k

70c or 158F is pretty cold. I would start with a piece of 2" wide aluminum tape (not Duct Tape. the glue makes a mess) and cover the coolant radiator and oil cooler all the way across. If for any reason that isn't enough add 1" at a time until you are at between 200F - 215F.
The 1.2 bar cap is close to 18 psi. If the temp goes up over 95c or 203F I would expect the pressure to rise to. Wait on the pressure and just address the temp first.
What coolant percentage mix are you using and or what coolant?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Coolant pressure and temperature

by andrew owen » 8 years ago

andrew owen

13 17 3

I'm not sure what's in all Ido know that it's not the waterless type,
Also it was reving to 5800 at wot, I have adjusted the prop to 5600, do I need to come down a little more Roger.

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Re: Coolant pressure and temperature

by andrew owen » 8 years ago

andrew owen

13 17 3

Thanks for the info, I will try the ally tape on the radiator

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Re: Coolant pressure and temperature

by Roger Lee » 8 years ago

Roger Lee

131 5.38k 5.44k

The 5600 WOT should be in the air in level flight. If 5600 is static on the ground it is way too high.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Coolant pressure and temperature

by andrew owen » 8 years ago

andrew owen

13 17 3

no Roger the 5600 is in level flight with a wot, I guess that's fine now then.

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