M-82 / M-105 engines

[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.