Today's Message Index:
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1. 12:53 AM - Nanchang CJ-6 QHQ-14A carburetor (jacques)
2. 05:34 AM - Re: Nanchang CJ-6 QHQ-14A carburetor (Harv)
3. 05:58 AM - Re: Re: Nanchang CJ-6 QHQ-14A carburetor (Richard Goode)
4. 06:02 AM - Re: Nanchang CJ-6 QHQ-14A carburetor (jacques)
5. 08:48 AM - Re: Nanchang CJ-6 QHQ-14A carburetor (Harv)
6. 09:04 AM - Re: Nanchang CJ-6 QHQ-14A carburetor (jacques)
Message 1
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| Subject: | Nanchang CJ-6 QHQ-14A carburetor |
Is there a specialist for the QHQ-14A or K-14A carburetor?
On my plane, the PZL TS-8, I have a K-14WN (WN is for the WN-3 engine), that is
exactly the same carb than on the Wilga, Yak-12/18A, PZL Gavron, etc (K-14BP)
and the Nanchang QHQ-14A.
All mechanics that came to set the carb are just turning the "click" needle for
the lean or rich idle and same for the toff/cruise/ full power "click" needle.
Some told me to change the jet for a smaller (rich) or bigger (lean), but none
of them knows how it works, what are numbers, etc.
I have at home some old carbs, one from a 260HP AI14, one from a Nanchang CJ6A
(285HP) and one from my plane (330HP) and after some investigations, I saw that
all these carbs are exactly the same except the venturi diameter and the profile
number of the metering needle.
On the AI14 and Huosai, venturi is 58mm, on my plane 60mm and the metering needle
number is N16 on the AI14, no idea on the Chinese and N11WN on my plane.
All other parts are exactly the same, including jets.
One is 260HP, the other 285HP and the last 330HP. They share the same carbs with
differents HP and they just change ( I am not sure for the AI14 and the Chinese)
venturi diameter (normal) and the metering needle.
My questions are :
- One of you is a real specialist about these carbs and can explain the numbers
of the metering needle valve?
- Do you think I can use as is the Nanchang CJ6 carb on my 330HP polish plane?
(they share the same carb with only the venturi diameter and the metering number
differences)?
- Do you know who is building these carbs actualy?
Thanks for your help
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| Subject: | Re: Nanchang CJ-6 QHQ-14A carburetor |
Hi Jacques
What is the issue with the carb on your K-14 engine?
My understanding is that the AI-14 and HS6 engine are indeed very close to each
other (you mention the carb sizes are identical) and I believe the power difference
noted is only as a result of the speed at which they were spun which gave
the difference on paper (260 v 285hp).
I'm sure Richard Goode will be able to give you some advise.
Providing the IR-14 and HS6 units will physically bolt to the K-14 engine then
I would try it. (Is there any altitude fuel correction mechanism on the K-14 carb?)
I would consult a carb specialist regarding opening out the venturi to match your
existing 60mm with one of the other units and then jet it to suit as per the
original unit.
If you were particularly concerned about flow rates you could ask to have this
tested also.
Interesting project
Rgs
Harv
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http://forums.matronics.com/viewtopic.php?p=494318#494318
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| Subject: | Re: Nanchang CJ-6 QHQ-14A carburetor |
Jacques and I have had some correspondence on this, but I can confirm as
follows:
The standard carburettor for the AI 14 R engine (260 hp) is the K-14 A. The
next development was the AI 14 RF, of 300 hp. But we are sure that the
carburettor was identical, although it was designated K-14 F. And indeed the
additional power was, as Harv writes, due only to increased rpm.
We have spent some time examining the Chinese carburettor for the HS-6
engine against the K-14 A carburettor, and without very sophisticated
measurements, they would appear to us to be identical.
But of course the carburettor for the M 14 engine, designated AK-14 P, is
significantly different internally, although externally very similar.
Richard
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 Harv
Sent: 17 January 2020 13:34
Subject: Yak-List: Re: Nanchang CJ-6 QHQ-14A carburetor
Hi Jacques
What is the issue with the carb on your K-14 engine?
My understanding is that the AI-14 and HS6 engine are indeed very close to
each other (you mention the carb sizes are identical) and I believe the
power difference noted is only as a result of the speed at which they were
spun which gave the difference on paper (260 v 285hp).
I'm sure Richard Goode will be able to give you some advise.
Providing the IR-14 and HS6 units will physically bolt to the K-14 engine
then I would try it. (Is there any altitude fuel correction mechanism on the
K-14 carb?)
I would consult a carb specialist regarding opening out the venturi to match
your existing 60mm with one of the other units and then jet it to suit as
per the original unit.
If you were particularly concerned about flow rates you could ask to have
this tested also.
Interesting project
Rgs
Harv
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=494318#494318
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| Subject: | Re: Nanchang CJ-6 QHQ-14A carburetor |
Hi Harv,
The carburetor on the PZL TS-8 is exactly the same than the one on the Nanchang
and the AI-14, without an automatic altitude fuel correction mechanism, just
a manual one, like on the CJ.
My carburetor was overhauled but since that, it is working very bad, I do not know
why. It was not OK before but after, it is really bad...
I have checked with my old Nanchang QHQ-14A carb, and idle is perfect, rpm are
rising fast, but before doing bullshit in flight with a more than 1 minute toff
rpm, I need to know!
Jacques
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http://forums.matronics.com/viewtopic.php?p=494320#494320
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| Subject: | Re: Nanchang CJ-6 QHQ-14A carburetor |
I would seek advise from the firm that did the overhaul on the old carb. They maybe
missed something simple upon reassembly.
What the rough running symptoms since o/h
The million dollar question regarding the AI-14 engine that Id like to know.....
is the prop mounting spline the same as on the hs6 unit?
Rgs
Harv
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http://forums.matronics.com/viewtopic.php?p=494321#494321
Message 6
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| Subject: | Re: Nanchang CJ-6 QHQ-14A carburetor |
Harv,
My engine is not an AI-14 it is a Narkiewicz WN-3.
This engine is a 7 cylinders Polish built using magnetos, carburetor, generator,
air start from Russian engines but built with the Jacobs 755 as a master.
After the II WW, the Russian refuse to sell the M14P to the Polish and as the national
airline, LOT, was using some Cessna T-50 with the Jacobs, they just copycat
the engine with more power and not only one parts the same, unfortunatly
for me, as I canot use Jacobs parts now...
The mounting spline is not the same as on the hs6, either the AI14 (different from
the HS6) but I do not know if it is the same as the Jacobs.
Jacques
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