M-82 / M-105 engines

[WTE_Galway]

Originally Posted by JtD

Is it correct that all the I-16 engines cut out under negative g?

Some did some did not.

The I16 types I and IV used the Shvetsov M-22 which was a license built Bristol Jupiter (forerunner to the Pegasus and Mercury). Carburetors included the Bristol Triplex and some variants would likely have had negative G issues. Certainly the Bristol Mercury engines fitted to the Gladiators were unhappy under negative G.

Apparently the types 5, 6 10 and 17 were fitted with Shvetsov M25 and usually used a K25 solex carb. The M25 was a licence built copy of the Wright Cyclone R1820-F3. I don't recall hearing about the R1820-F3 ever having neg G problems in US use.

Types 18, 24 and 27 used the Shvetsov M62 an improved M25 and hence was also a Wright Cyclone R1820-F3 derivative and unlikely to have neg G issues.

The M62 was further developed as the M63 and fitted to types 24, 28, 29 and 30 The M62 was once again a Wright Cyclone R1820-F3 derivative.

[Zorin]

Originally Posted by WTE_Galway

Some did some did not.

The I16 types I and IV used the Shvetsov M-22 which was a license built Bristol Jupiter (forerunner to the Pegasus and Mercury). Carburetors included the Bristol Triplex and some variants would likely have had negative G issues. Certainly the Bristol Mercury engines fitted to the Gladiators were unhappy under negative G.

Apparently the types 5, 6 10 and 17 were fitted with Shvetsov M25 and usually used a K25 solex carb. The M25 was a licence built copy of the Wright Cyclone R1820-F3. I don't recall hearing about the R1820-F3 ever having neg G problems in US use.

Types 18, 24 and 27 used the Shvetsov M62 an improved M25 and hence was also a Wright Cyclone R1820-F3 derivative and unlikely to have neg G issues.

The M62 was further developed as the M63 and fitted to types 24, 28, 29 and 30 The M62 was once again a Wright Cyclone R1820-F3 derivative.

Just because the engine was license built does not mean that the carburetor was. It is a seperate and interchangeable part and therefor could have been easily replaced by a domestic one.

[SaQSoN]

Engines M-25, M-25В, М-62, М-63 and М-82А were equipped with float carburetor АК-25-4ДФ or К-25-4Д. Some M-63 were equipped with float-less АК-63.

M-82Ф was equipped with float-less carburetor, М-82ФН - with direct injection system.

M-105 since 1940 were equipped with floatless carburetor К-105БП

PS Most of this devices were designed by Fedor Amosovich Korotkov and his design crew. After the war, with the rise of the jet era, he switched to jet engine fuel feed systems and his designs were again used in most Soviet jet engines until late 1980.

[WTE_Galway]

Originally Posted by SaQSoN

Engines M-25, M-25В, М-62, М-63 and М-82А were equipped with float carburetor АК-25-4ДФ or К-25-4Д. Some M-63 were equipped with float-less АК-63.

M-82Ф was equipped with float-less carburetor, М-82ФН - with direct injection system.

M-105 since 1940 were equipped with floatless carburetor К-105БП

PS Most of this devices were designed by Fedor Amosovich Korotkov and his design crew. After the war, with the rise of the jet era, he switched to jet engine fuel feed systems and his designs were again used in most Soviet jet engines until late 1980.

Thanks, very useful information.

[JtD]

But the K25 carburettor was pretty advanced for its time and for instance had automatic mixture adjustment. I tend to agree with Galway that it is unlikely the later I-16's suffered from neg g cutout, but one would have to be sure.

The K25 was also used with the M62/M63 engines, as was the K63 (AK-25-4DF and AK-63-TK). The technical descriptions of these carburettors, as far as I could find them, made no statement regarding the working principle (float or no float) or about behaviour under negative g.
---
OK, thanks SaQSoN.

[SaQSoN]

Originally Posted by JtD

The technical descriptions of these carburettors, made no statement regarding the working principle (float or no float).

K-25-4 family was all float, that's for sure.

[JG52Karaya]

Thanks everybody for your constructive posts,

I still have one more question, namely what the situation was on the AM-35/-38 engine family used on the MiG-3 and IL-2. Did these have float, floatless or injection type carbs!?

[SaQSoN]

Originally Posted by JG52Karaya

I still have one more question, namely what the situation was on the AM-35/-38 engine family used on the MiG-3 and IL-2. Did these have float, floatless or injection type carbs!?

Floatless carb.

[bugmenot]

Hi SaQSoN, can you translate this?

Решением ЦК ВКП(б) и СНК СССР от 26 декабря 1940 г. завод № 24 получил указание с апреля 1941 г. выпускать моторы АМ-35А с карбюраторами беспоплавкового типа. Такие карбюраторы были изготовлены, проверены в наземных и летных условиях. Но моторы с беспоплавковыми карбюраторами не были взаимозаменяемыми с обычными AM—35A, внедрение их требовало переделки некоторых узлов двигателя, а также посадочных узлов и капотов самого самолета. Несмотря на определенные преимущества беспоплавковых карбюраторов в силу отмеченных причин они не были внедрены в массовую серию, но более десятка машин с такими карбюраторами все же были изготовлены и сданы в строевые части [22].

http://wunderwaffe.narod.ru/WeaponBook/Avia/Mig3/04.htm