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rparigoris
Joined: 24 Nov 2009
Posts: 797
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 Posted: Wed Jun 09, 2010 5:24 pm Post subject: Intercooler for 914 |
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Has anyone measured the air-box temperature drop (if any) when using the inter cooler (Bell?) installed as per Factory instructions (John Hurst)?
If you wouldn't mind sharing particulars, that would be appreciated.
For those of you flying 914 without inter cooler, have you ever reached intervention temperature where TCU turned down pressure?
If you wouldn't mind sharing particulars, that would be appreciated including if you have new style TCU with 88C air-box.
Very discouraging that Frans found that his inter cooler didn't drop air box temperature at all.
Ron Parigoris
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frans(at)privatepilots.nl
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| Posted: Thu Jun 10, 2010 3:35 am Post subject: Intercooler for 914 |
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On 06/10/2010 03:24 AM, rparigoris wrote:
| Quote: | Has anyone measured the air-box temperature drop (if any) when using the inter cooler (Bell?) installed as per Factory instructions (John Hurst)?
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Furhter investigation revealed that measuring the airbox temperature is
not an easy task. The sensor has to be mounted in the metal heat
conducting airbox, and measure the temperature of a very bad heat
conductor inside. It appears to be difficult to prevent heat from the
airbox itself to influence the sensor.
I prepared a special temperature sensor for this, but even this sensor
appears to leak some heat from the mounting thread to the tip.
I have asked UMA to make a special airbox temperature sensor for me. If
anyone is interested, I can ask them to make a few more of these.
Frans
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rparigoris
Joined: 24 Nov 2009
Posts: 797
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| Posted: Thu Jun 10, 2010 6:47 am Post subject: Re: Intercooler for 914 |
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Hi Frans
I ordered a while back one of UMAs senders for their air box probe without anything inside. Ends up it fits my 3-TO-92 package (-55 to 150C) perfectly:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=78342
Make sure you get their special sealing washer.
Ron Parigoris
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frans(at)privatepilots.nl
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| Posted: Thu Jun 10, 2010 7:05 am Post subject: Intercooler for 914 |
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On 06/10/2010 04:47 PM, rparigoris wrote:
I'm not sure if I understand this correctly. The UMA sender I got was
all metal. It was just measuring the temperature of the airbox, not from
the air inside. The airbox itself is probably a lot warmer than the air
inside.
So, I filed off the metal surrounding the protruding part of the sensor.
There it was, the sensor itself embedded in epoxy. Now it worked much
better, but still it looks like the airbox temperature is influencing
the measuring of the air temperature. UMA agreed that this setup is not
working well, so they are willing to make a sensor with a much more
protruding tip.
So, the problem is not the sensor, but how to mount the sensor without
heat leak from the metal thread to the sensor itself.
Frans
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rparigoris
Joined: 24 Nov 2009
Posts: 797
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| Posted: Thu Jun 10, 2010 7:31 am Post subject: Re: Intercooler for 914 |
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Hi Frans
Now I too am confused a little. I figured UMA had it figured out how to best measure air box air temperature. They offer a Rotax 914 air box sender. I can't use their sender output, so I ordered one of their senders without anything inside. It is a hex head probe made out of brass with a perhaps 1" or 1+1/4" thin extension that protrudes into air box stream. It comes with a nice black rubber seal (think steel or aluminium washer covered with rubber). I was going to make one, but figured if they have it figured out, just use theirs and install my electronic sender in it. Making a longer and thinner probe has more probability of breaking off.
Are you saying this is the sender you purchased from UMA originally that is not working too well? Now they are making you another with a longer probe tip?
Thx.
Ron Parigoris
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frans(at)privatepilots.nl
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| Posted: Thu Jun 10, 2010 8:09 am Post subject: Intercooler for 914 |
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On 06/10/2010 05:31 PM, rparigoris wrote:
| Quote: | Now I too am confused a little.
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It gets more confusing all the time!
| Quote: | I figured UMA had it figured out how
to best measure air box air temperature. They offer a Rotax 914 air
box sender.
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Well, when I ordered it, I asked specifically for something like this,
but they didn't have it. I could buy the carb temp stuff instead. So
that is what I bought, although the upper limit of the scale is with
+60C less than I wanted, and the low limit of -60C is somewhat less than
I ever hope to encounter with my Europa!
| Quote: | I can't use their sender output, so I ordered one of
their senders without anything inside. It is a hex head probe made
out of brass with a perhaps 1" or 1+1/4" thin extension that
protrudes into air box stream.
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Do you have a part number or anything else I can refer to?
| Quote: | Are you saying this is the sender you purchased from UMA originally
that is not working too well?
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Yep. It was all metal. So essentially it was measuring the temperature
of the metal airbox itself.
Frans
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rparigoris
Joined: 24 Nov 2009
Posts: 797
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| Posted: Fri Jun 11, 2010 9:50 am Post subject: Re: Intercooler for 914 |
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Hi Frans
Here are a few pics of UMAs air box probe housing they sold me:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=78342
Last 3 pics.
Please let me know if this is the probe housing you are not having problems with.
I specific ordered from them figuring they had it figured out, but my initial feeling was it is too short.
Ron Parigoris
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