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Carb swap, manifold pressure oddness

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jonboede(at)hotmail.com
Guest

Posted: Sun Mar 17, 2019 5:02 pm Post subject: Carb swap, manifold pressure oddness

Finally got my stock CJ flying after having swapped the carb. 



Runs great, makes lots of power... but...



The manifold pressure goes UP at full power but never seems to drop down below ambient when the throttle is pulled back. Drops to maybe 700 at 1,000 RPM, a little lower in the back seat, so it’s not the gauge. 



I didn’t mess with the manifold pressure line. Seems to run quite smoothly from idle to full power with good control, no popping. If it was sucking air I would think it would run super lean and miss. 



Ideas? The carb was new from Doug and I de-preserved it properly (I think, hope). 



Jon

wlannon(at)shaw.ca
Guest

Posted: Mon Mar 18, 2019 10:21 am Post subject: Carb swap, manifold pressure oddness

Hi Jon;



If you have installed intake drains without re-inforcing the thin wall 

tubing at the drain boss there is a possibility of crack development around 

the boss.



I do not know if this is the problem but it certainly is a candidate.  Check 

it out.



Walt



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jonboede(at)hotmail.com
Guest

Posted: Mon Mar 18, 2019 11:03 am Post subject: Carb swap, manifold pressure oddness

Ha! I messed with one of my intake drain sumps as well as one of the intake tubes when swapping the carb. That may be it!



[quote] On Mar 18, 2019, at 1:28 PM, Walter Lannon <wlannon(at)shaw.ca> wrote:

 

 

 

 Hi Jon;

 

 If you have installed intake drains without re-inforcing the thin wall tubing at the drain boss there is a possibility of crack development around the boss.

 

 I do not know if this is the problem but it certainly is a candidate.  Check it out.

 

 Walt

 

 --

richard.goode(at)russiana
Guest

Posted: Mon Mar 18, 2019 11:23 am Post subject: Carb swap, manifold pressure oddness

With the M 14 P engine we have seen many engines where people have installed manifold oil drain systems, but use the original very thin drain plug which is clearly not designed to be drilled and tapped to put a fitting into it, and after a while they will tend to crack! The solution is a much thicker plug which is designed to be drilled and tapped, and is a long-term solution. We, and quite likely others, make them.



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.

--

jay-dub

Joined: 31 May 2014
Posts: 99
Location: UK

Posted: Tue Mar 19, 2019 4:53 am Post subject: Re: Carb swap, manifold pressure oddness

Having pulled ours apart at the weekend, this weld cracking (tapping directly from no.5 cylinder manifold, coupled with a poor design) was the cause of our deadstick, not our original conclusion.



Richard, I presume the pipes for the M14P also fit the HS-6? I had a look at G-BVVG the other day and they look to be the same as on G-YAKH.

_________________
CJ owner

richard.goode(at)russiana
Guest

Posted: Tue Mar 19, 2019 6:29 am Post subject: Carb swap, manifold pressure oddness

I'm sorry to say, but I don't know! As I'm sure you know, the background was

that the Russians developed the AI 14 engine (260 hp) with Ivchenko, and the

design was then taken from them and given to the new design bureau of

Vedenyeev in Voronezh who developed the M 14 P family of engines. At the

same time the Russians gave the design of the AI 14 to the Chinese, who made

the HS-6 with 285 hp.



We have wanted to get into the business of overhauling the Chinese engines,

so obtained an old one, working on the assumption that it was going to be

almost identical to the AI 14 for which we have all the technology and a lot

of spares. However, in the event, it is a very different engine with many

parts that are unique, to the extent that we realised we simply could not

overhaul it!



I can say that the M 14 exhaust has a slightly larger diameter than the

HS-6, and this might well also be the case with the intake tubes, so I

suspect you would need to measure them to be sure.



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.



--

jay-dub

Joined: 31 May 2014
Posts: 99
Location: UK

Posted: Tue Mar 19, 2019 7:02 am Post subject: Re: Carb swap, manifold pressure oddness

Thank for the information.

_________________
CJ owner

wlannon(at)shaw.ca
Guest

Posted: Tue Mar 19, 2019 9:55 am Post subject: Carb swap, manifold pressure oddness

The intake tubes of the Huosai 6A and the M14P are exactly the same dia. 

However the cylinder adaptor has a slightly larger thread dia. and the 

attaching nut has a corresponding larger thread dia. so they are not 

interchangeable even though the same pin wrench fits both!



Walt



--

jay-dub

Joined: 31 May 2014
Posts: 99
Location: UK

Posted: Sat Mar 23, 2019 2:55 pm Post subject: Re: Carb swap, manifold pressure oddness

Thanks, Walt.

_________________
CJ owner

JasperWheeler
Guest

Posted: Wed Mar 13, 2024 1:02 pm Post subject: Re: Carb swap, manifold pressure oddness

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