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Nanchang CJ-6 QHQ-14A carburetor

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jacques

Joined: 06 May 2009
Posts: 36
Location: Pessac, France

Posted: Fri Jan 17, 2020 12:52 am Post 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 NÂ°16 on the AI14, no idea on the Chinese and NÂ°11WN 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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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Fri Jan 17, 2020 5:33 am Post 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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richard.goode(at)russiana
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Posted: Fri Jan 17, 2020 5:58 am Post subject: 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(at)russianaeros.com

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.



--

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jacques

Joined: 06 May 2009
Posts: 36
Location: Pessac, France

Posted: Fri Jan 17, 2020 6:01 am Post 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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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Fri Jan 17, 2020 8:48 am Post 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 Iâ€™d like to know..... is the prop mounting spline the same as on the hs6 unit?

Rgs

Harv

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jacques

Joined: 06 May 2009
Posts: 36
Location: Pessac, France

Posted: Fri Jan 17, 2020 9:03 am Post 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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