Hi Bob,
I was watching this thread with interest. The thought of a thermostat on an
oil system that relies entirely on crankcase pressure for the return (912/4)
scares the willies out of me too!
As I understrand it, the Rotax oil thermostat by-passes the radiator but
maintains circulation, unlike the car water system that stops (reduces) the
flow.
If I were going to control the oil temperature, I would have a
temperature-transducer controlled vane adjusting the airflow through the
radiator - not the oil........much less risky.
Sounds like a mission for Mark Burton (should he choose to accept)!
Nigel
----- Original Message -----
From: "R.C.Harrison" <ptag.dev@tiscali.co.uk>
Sent: Tuesday, January 24, 2006 3:41 PM
Subject: RE: Europa-List: Oil Thermostat
Hi! Nigel
I've been keeping "schtumn" because I'm not a Rotax Buff. BUT.... this
thermostat idea on oil systems gives me the creeps what if ......!
Much better to focus on a pilot control facility like metering the oil
to the cooler by pilot controlled valve. I know this is something else
to constantly do but you should be always "heads up " on P's and T's
anyway.
I have a system of P1 controlled oil to cooler metered or even off
completely and the engine still gets full flow supply at all settings.
I rarely need to engage the cooler but I have an all air cooled engine.
Regards
Bob Harrison G-PTAG Europa MKI Jabiru 3300
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Nigel
Graham
Sent: 24 January 2006 09:11
Subject: Re: Europa-List: Oil Thermostat
<nigel_graham@btclick.com>
Wax thermostats used in cars were notorious for failing closed
(overheating
the engine) since the wax capsule would split and the wax escape. It was
the
bi-metallic thermostats that failed safe.
I have no idea how this oil 'stat fails but would guess closed.
Nigel
----- Original Message -----
From: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
Sent: Monday, January 23, 2006 11:15 PM
Subject: Re: Europa-List: Oil Thermostat
<ami@mcfadyean.freeserve.co.uk>
More often in the open position, AFAIK.
Cars with failed thermostats tend to run cold, rather than the reverse.
Duncan McF.
----- Original Message -----
From: "Mike Parkin" <mikenjulie.parkin@btopenworld.com>
Sent: Monday, January 23, 2006 9:53 PM
Subject: Re: Europa-List: Oil Thermostat
> <mikenjulie.parkin@btopenworld.com>
>
> Duncan,
>
> If the waxstat fails does it fail open, closed or in the position
where it
> failed.
>
> regards,
>
> MP
>
>
> ----- Original Message -----
> From: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
> To: <europa-list@matronics.com>
> Sent: Monday, January 23, 2006 9:43 PM
> Subject: Re: Europa-List: Oil Thermostat
>
>
>> <ami@mcfadyean.freeserve.co.uk>
>>
>> Yes they do (i.e. open very rapidly within a few degrees) around the
>> temperature that they are 'rated' for, and close less rapidly. If you
try
>> it
>> in water you'll see what I mean; an element rated at 80 will be doing
>> next
>> to nothing at around 78, then be fully open by about 82.
>> Having to dig deep in memory for this one!
>> If the temperature at any time exceeds 140 C then the wax element is
>> permanently destroyed.
>>
>> Duncan McF.
>
>
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