Today's Message Index:
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1. 08:40 AM - Compressor charging (1906)
2. 09:33 AM - Re: Compressor charging (Richard Goode)
3. 09:57 AM - Re: Compressor charging (1906)
Message 1
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| Subject: | Compressor charging |
I have flown behind two M14Ps recently and the pressure replenishment was different.
One of them with less than 200 hours, the pressure system would charge during
idle (40% RPM). On the other, with 620 hours, the pressure seemed to only
charge in flight. Is this normal or will the compressor need replacement soon?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502155#502155
Message 2
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| Subject: | Compressor charging |
In our experience, the compressor is the weakest link in the M 14 engine, and many
become much less effective in less than 500 hours. This is not helped since
some, when overhauling the compressors simply put in new sets of piston rings
rather than new cylinders which we feel are often required. This is an expensive
exercise; cylinders and indeed new pistons can be difficult to find. But
a good compressor will certainly charge at 40%, and I can totally understand that
a worn compressor needs to be turning at higher rpm i.e. in flight to charge.
Another very important point is that the compressor is working very hard simply
because it is charging the system until the release-valve blows off; pressure
reduces and then it starts working again. It is so much better to modify your
aircraft and bring the water drain valve from the firewall into the cockpit with
the water drain exit going through the floor of the aircraft. In this way
you start the engine with the water drain firmly shut; after take off, the pressure
builds up to its normal maximum, then you open the water drain and the compressor,
although still operating is working totally off load and under dramatically
less strain and will last far longer!
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode@russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
-----Original Message-----
From: owner-yak-list-server@matronics.com <owner-yak-list-server@matronics.com>
On Behalf Of 1906
Sent: 31 May 2021 16:40
Subject: Yak-List: Compressor charging
I have flown behind two M14Ps recently and the pressure replenishment was different.
One of them with less than 200 hours, the pressure system would charge during
idle (40% RPM). On the other, with 620 hours, the pressure seemed to only
charge in flight. Is this normal or will the compressor need replacement soon?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502155#502155
Message 3
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| Subject: | Re: Compressor charging |
Thanks, Richard. These both have the compressor bypass (water drain as you call
it) valve fitted already, but good info to know about the 500 hours.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502159#502159
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