Today's Message Index:
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1. 01:12 AM - Re: ROTAX 914 LOW OIL PRESSURE (ptag.dev@tiscali.co.uk)
2. 02:21 AM - Re: ROTAX 914 LOW OIL PRESSURE ()
3. 09:45 AM - Re: ROTAX 914 LOW OIL PRESSURE (Roger Lee)
4. 10:54 AM - Re: ROTAX 914 LOW OIL PRESSURE (Noel Loveys)
5. 01:56 PM - Re: Re: ROTAX 914 LOW OIL PRESSURE (Ivan)
6. 02:08 PM - Re: Re: ROTAX 914 LOW OIL PRESSURE ()
Message 1
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| Subject: | Re: ROTAX 914 LOW OIL PRESSURE |
Hi!Bob Lindsey
I had some "airating" oil problems with the 3300 Jabiru at one stage which showed
ip as fluctuating pressure. I'd have thought Rotax being somewhat more pedantic
would have a "de-airating tray" prior to the oil pump?
I didn't notice any oil pressure deterioration at 10,000ft on mine.
Regards
Bob Harrison G-PTAG (Now with 914)
----Original Message----
From: RLINDSA2@san.rr.com
Subj: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
I don't know what actually causes oil to foam. Honda GN-4 was recommended by Rotax
rep Eric Tucker. I plan on trying to repeat the situation on a forthcoming
high altitude flight.
----- Original Message -----
From: Paul McAllister
Sent: Monday, February 23, 2009 6:02 PM
Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
Hi Bob,
One possibility is that you are getting oil foaming at altitude. I seem to recall
John Hurst back in the days he was at Europa that he had a problem with some
oils doing this.
I can't remember which oil he had the most trouble with, but I seem to recall that
he got good results with Valvoline Durablend.
Paul
--- On Mon, 2/23/09, ROBERT LINDSAY <RLINDSA2@san.rr.com> wrote:
From: ROBERT LINDSAY <RLINDSA2@san.rr.com>
Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
Recently I had the need to climb to FL180 on a below standard temp day. Oil press
in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on this
occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure began
decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rapids EIS oil pressure
alarmed at 25 psi. Power was retarded to below 65 percent and descent commenced.
Oil pressure returned to normal (about 50 psi) below 15 Kft where OAT
was near stnd. Flight continued at 12Kft at 75 percent power, all engine parameters
indicating normal.
Oil quantity checked after landing indicated near full. Oil is Honda GN-4 10W40.
Oil pressure on several flights since (altitude below 10 Kft) has been normal.
Why would oil pressure drop under the above conditions? I suspect a sensing/indication
problem.
font face="Arial" size="2">Thanx, all. Bob Lindsay, Europa XS monogear N77EU,
San Diego CA
ist">http://www.matronics.com/Navigator?RotaxEngines-List
ics.com
.matronics.com/contribution
Get up to 50% off Norton Security 2009 only from Tiscali - http://www.tiscali.co.uk/securepc
__________________________________________
Message 2
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| Subject: | Re: ROTAX 914 LOW OIL PRESSURE |
Hi Bob
Rotax do have a Mesh Baffle insert in the Oil tank just for that purpose,
A couple of years back Rotax remove some oil Manufacturers from there recommended
list because of foaming, I would stick with the recommended oil only,
regards
Ivor
---- "ptag.dev@tiscali.co.uk" <ptag.dev@tiscali.co.uk> wrote:
>
> Hi!Bob Lindsey
>
> I had some "airating" oil problems with the 3300 Jabiru at one stage which showed
ip as fluctuating pressure. I'd have thought Rotax being somewhat more pedantic
would have a "de-airating tray" prior to the oil pump?
>
> I didn't notice any oil pressure deterioration at 10,000ft on mine.
>
> Regards
>
> Bob Harrison G-PTAG (Now with 914)
>
>
>
>
> ----Original Message----
> From: RLINDSA2@san.rr.com
> Date: 24/02/2009 4:12
> To: <rotaxengines-list@matronics.com>
> Subj: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
>
>
>
>
> I don't know what actually causes oil to foam. Honda GN-4 was recommended by
Rotax rep Eric Tucker. I plan on trying to repeat the situation on a forthcoming
high altitude flight.
>
> ----- Original Message -----
> From: Paul McAllister
> To: rotaxengines-list@matronics.com
> Sent: Monday, February 23, 2009 6:02 PM
> Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
>
>
>
>
>
> Hi Bob,
>
> One possibility is that you are getting oil foaming at altitude. I seem to recall
John Hurst back in the days he was at Europa that he had a problem with some
oils doing this.
>
> I can't remember which oil he had the most trouble with, but I seem to recall
that he got good results with Valvoline Durablend.
>
> Paul
>
> --- On Mon, 2/23/09, ROBERT LINDSAY <RLINDSA2@san.rr.com> wrote:
>
> From: ROBERT LINDSAY <RLINDSA2@san.rr.com>
> Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
> To: rotaxengines-list@matronics.com
> Date: Monday, February 23, 2009, 5:14 PM
>
>
>
> Recently I had the need to climb to FL180 on a below standard temp day. Oil
press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on this
occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure began
decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rapids EIS oil pressure
alarmed at 25 psi. Power was retarded to below 65 percent and descent
commenced. Oil pressure returned to normal (about 50 psi) below 15 Kft where
OAT was near stnd. Flight continued at 12Kft at 75 percent power, all engine
parameters indicating normal.
>
> Oil quantity checked after landing indicated near full. Oil is Honda GN-4 10W40.
Oil pressure on several flights since (altitude below 10 Kft) has been normal.
>
> Why would oil pressure drop under the above conditions? I suspect a sensing/indication
problem.
>
> font face="Arial" size="2">Thanx, all. Bob Lindsay, Europa XS monogear N77EU,
San Diego CA
>
> ist">http://www.matronics.com/Navigator?RotaxEngines-List
> ics.com
> .matronics.com/contribution
>
>
>
>
>
>
>
> Get up to 50% off Norton Security 2009 only from Tiscali - http://www.tiscali.co.uk/securepc
> __________________________________________
Message 3
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| Subject: | Re: ROTAX 914 LOW OIL PRESSURE |
Oil foaming used to be a bigger issue a number of years back. That is why Rotax
raised the oil level in the tank a few years back to help reduce the chance of
sucking in air through the oil tank. Some oils do do have a propensity to foam
more than others, but the semi synthetic and full synthetics of today are not
as bad as they were many years ago or as bad as a straight dino oil.
The least foaming of all the oils seems to be Amsoil (10-40 or 20-50 motorcycle
oil). Mobile 1 Racing 4T, Aero Shell Sport Plus 4 and the Honda GN-4 oil are
all good oils. I have seen Amsoil flown to 17K. You should not have any foaming
issues with these oils. As Ivor pointed out Rotax has the wire mesh and the
baffle plate inside the tank to help with sloshing and foaming.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=231830#231830
Attachments:
http://forums.matronics.com//files/oil_comparison_727.pdf
Message 4
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| Subject: | ROTAX 914 LOW OIL PRESSURE |
Oil foams when it gets hot and viscosity drops a little. Teh beating of the
oil pump is what froths it up. Usually somewhere int the system there is a
place where the oil is spun before the cooler to try to centrifugally
remove the air form the oil. The 912 oil tank I have has the return line to
the side of the tank in such a way as to spin the oil entering it...
Airbubbles then rise and the pick up for the oil pump is at the bottom. The
idea being to avoid getting too much air in the oil returning to the cooler
then to the engine.
Noel
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ROBERT
LINDSAY
Sent: Tuesday, February 24, 2009 12:42 AM
Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
I don't know what actually causes oil to foam. Honda GN-4 was recommended
by Rotax rep Eric Tucker. I plan on trying to repeat the situation on a
forthcoming high altitude flight.
----- Original Message -----
From: Paul McAllister <mailto:l_luv2_fly@yahoo.com>
Sent: Monday, February 23, 2009 6:02 PM
Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
Hi Bob,
One possibility is that you are getting oil foaming at altitude. I seem to
recall John Hurst back in the days he was at Europa that he had a problem
with some oils doing this.
I can't remember which oil he had the most trouble with, but I seem to
recall that he got good results with Valvoline Durablend.
Paul
--- On Mon, 2/23/09, ROBERT LINDSAY <RLINDSA2@san.rr.com> wrote:
From: ROBERT LINDSAY <RLINDSA2@san.rr.com>
Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE
Recently I had the need to climb to FL180 on a below standard temp day. Oil
press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on
this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure
began decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rapids EIS
oil pressure alarmed at 25 psi. Power was retarded to below 65 percent and
descent commenced. Oil pressure returned to normal (about 50 psi) below 15
Kft where OAT was near stnd. Flight continued at 12Kft at 75 percent power,
all engine parameters indicating normal.
Oil quantity checked after landing indicated near full. Oil is Honda GN-4
10W40. Oil pressure on several flights since (altitude below 10 Kft) has
been normal.
Why would oil pressure drop under the above conditions? I suspect a
sensing/indication problem.
font face="Arial" size="2">Thanx, all. Bob Lindsay, Europa XS monogear
N77EU, San Diego CA
ist">http://www.matronics.com/Navigator?RotaxEngines-List
ics.com
.matronics.com/contribution
Message 5
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| Subject: | Re: ROTAX 914 LOW OIL PRESSURE |
I also had some fluctuating oil pressures in the past. After changing out
three sending units and having the same thing happen again, I figured that
it was impossible for it to be a defective sending unit. Sure enough I
concentrated on tidying us the wire connections a bit and it never happened
again.
Ivan
Phoenix, AZ
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Monday, February 23, 2009 5:24 PM
Subject: RotaxEngines-List: Re: ROTAX 914 LOW OIL PRESSURE
>
> Most of these oil pressure issues tend to be sending units or bad grounds.
> If you really lose oil pressure you'll have some other serious issues to
> contend with.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Service Center
> 520-574-1080
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=231712#231712
>
>
>
Message 6
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| Subject: | Re: ROTAX 914 LOW OIL PRESSURE |
I had a problem with wildly fluctuating oil pressure. Turned out to be a bad ground.
--- imap8ntr@cox.net wrote:
From: "Ivan" <imap8ntr@cox.net>
Subject: Re: RotaxEngines-List: Re: ROTAX 914 LOW OIL PRESSURE
I also had some fluctuating oil pressures in the past. After changing out
three sending units and having the same thing happen again, I figured that
it was impossible for it to be a defective sending unit. Sure enough I
concentrated on tidying us the wire connections a bit and it never happened
again.
Ivan
Phoenix, AZ
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Monday, February 23, 2009 5:24 PM
Subject: RotaxEngines-List: Re: ROTAX 914 LOW OIL PRESSURE
>
> Most of these oil pressure issues tend to be sending units or bad grounds.
> If you really lose oil pressure you'll have some other serious issues to
> contend with.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Service Center
> 520-574-1080
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=231712#231712
>
>
>
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