Japanese engine sizes

[Shortround6]

TO keep from derailing the Corsair vs Zero thread any more here are the major Japanese radial engines:


engine type..................cylinders.........diameter..........weight..........displacement

Mitsubishi Zuisei............14.................1118mm..........540kg.............28L (1708 ci?)
Nakajima Sakae (early)...14.................1150mm..........530kg.............27.9L (1702 ci?)
Nakajima Sakae (late).....14.................1150mm.........590kg.............27.9L (1702 ci?)
Mitsubishi Kinsei.............14................1218mm.........545kg.............32.3L (1971 ci?)
Nakajimi Ha-41..............14.................1260mm.........630kg.............37.5L (2287 cu?)
Nakajima Ha-109...........14.................1260mm..........720kg............37.5L (2287 cu?)
Mitsubishi Kasei.............14................1340mm...........780kg............42L ( 2567ci ?)
Nakajima Mamori............14................1380mm...........870kg............49L ( 2989ci ?)
Nakajima Homare...........18.................1180mm..........835kg............35.8L (2183ci ?)

I would note that the Mamori was not exactly a success and about 200 were built. Also when the A6M8 was built with the Kinsei engine the cowl gun/s were deleted.
The Nakajima Ha-41 and Mitsubishi Kasei were originally bomber engines.
Weights for Japanese engines can vary depending on model.

American engines for comparison

P W R-1830...........14.................1221mm...........662kg*..............30L
Wright R-2600..........14..................1377mm..........886kg................42.7L
P W R-2800...........18..................1326mm..........1043kg..............45.9L

Wright R-1820...........9..................1400mm..........442-617kg............29.9L

Low weight is for an early 890hp ungeared version, high weight is for post war 1425hp version. 1200hp versions were around 599KG


Weights for american engines are for early war single stage, two speed engines.

 

[Ivan1GFP]

Thanks Shortround,

Can you also include data for the R-1820 for completeness.

Thanks.
- Ivan.

 

[N4521U]

I thought it would be tiny, tinier, and pocket size................ sorry

 

[cherry blossom]

One might add the Mitsubishi Ha-104 (Ha 42 in the unified system) as it powered the Ki-67. It used the same cylinder bore and stroke as the Kasei but with 18 cylinders.

engine type..................cylinders.........diameter.. ........weight..........displacement

Mitsubishi Ha-104............18.................1372 mm....... ..1140 kg.............54.1L (3301 ci)

More generally, Mitsubishi and Nakajima each produced engines with three cylinder sizes. Typically they produced these in 14 cylinder and 18 cylinder versions, except that Mitsubishi never tried to make an eighteen cylinder engine using the Zusei cylinders. The Mitsubishi engine using 18 Kinsei cylinders was the Ha 43 and it powered the A7M2 Reppu and Ki-83 prototypes but a combination of earthquakes and B-29 raids prevented major production. The Nakajima Ha 44 and Ha 217 used the Ha 41/Ha 109 and the Mamori cylinder sizes respectively but were not used in service.

The take home message is that both companies were designing and testing too many engines. The problem for the Army and Navy was deciding which engines to abandon. With hindsight we can see that the Mitsubishi Zusei always produced slightly less power than the Nakajima Sakae and could have been replaced in all its applications without any cost. We can also see that the Mamori and Ha 217 were never reliable. Had the Navy insisted that the B6N1 used the Kasei, it might have been ready for service in the Guadalcanal Campaign. At the time it was probably harder, especially as Nakajima was a politician and the early Kasei engines didn't have quite the same power for take off.

 

[Shortround6]

thank you the extra information. I limited the the list to the engines available in the early part of the the war and threw in the Homare because most people are familiar with it.

The Japanese certainly did spread too few engineers over too many projects, wither it was engines, air frames, weapons, etc. The almost total lack of co-operation between the Army and Navy ( it seems that each would rather be destroyed than co-operate or take 2nd place to the other) is amazing and much worse than what the Germans were doing.

 

[stan reid]

I don't have any details but they also had some water-cooled inverted V12 engines like the Kawasaki Ha-40 and Ha-140.

 

[johnbr]

Mitsubishi Ha 42 Model 41 Ru (Ha 214 Ru), Radial 18 Engine
Physical Description

• Type: Reciprocating, 18 cylinders, 2 rows, radial, air cooled
• Power rating: 1,715 kW (2,300 hp) at 2,500 rpm
• Displacement: 54.1 L (3,300 cu in.)
• Bore and Stroke: 150 mm (5.91 in.) x 170 mm (6.69 in.)
• Weight: 1,235 kg (2,723 lb)
• Outside dual superchargers; Fuel injected; Cooling fan; Two-speed reduction gearing (0.588 and 0.457); Push rods for rear cylinders at the rear of the engine; Cuno-type rotary oil screen (Nakajima-type); Manufactured between 1940-45.
• Missing starter, generator, carburetor, spark plugs and data plate; On stand.

 

[johnbr]

Shoda-Hikoki Shoda-Ken No. 1, Inverted V-12 Engine

 

[johnbr]

 

[johnbr]

 

[johnbr]

Mitsubishi Ha 42 Model 41 Ru (Ha 214 Ru), Radial 18 Engine
Dimensions

• Other: 52 3/4 x 92 5/8in. (134 x 235.2cm)
• Approximate (with stand): 160.02 x 218.44 x 161.29cm (5ft 3in. x 7ft 2in. x 5ft 3 1/2in.)
• Approximate (Weight on Stand): 1551.3kg (3420lb.)
• Diameter 134 cm (52.75 in.), Length 235.2 cm (92.63 in.)

 

[BiffF15]

Very nice shots JohnBr! What is the upright V engine? It looks like it has three banks.

V/R,
Biff

 

[johnbr]

Yokosuka Naval Air Arsenal YE2H (Ha 73 Model 01), W-18 Engine
In 1934, the Japanese Navy began development of an 18-cylinder, 40 degree angle W-type engine known as the 671 kW (900 shp) Model 94. More powerful versions of this engine were later undertaken, including the YE2A which started development around 1937-38.

A derivative of the YE2A was this W-type engine known as Ken No. 3 (believed to be the YE2H, also Ha 73 Model 01) began its development around 1942, and construction is believed to have been finished about March 1944. The purpose of this design was to promote aircraft streamlining and thus speed. The intended airframe application is unknown, but the engine design is for a pusher installation. The engine was experimentally tested, but there is no record indicating that it was test flown.

None of the high power liquid-cooled engines under development by Japan reached operational status by war's end, and, following the war, the focus of international engine development turned toward turbine engines.
Dimensions
Height 114.3 cm (45 in.), Width 111.8 cm (44 in.), Depth 246.4 cm (97 in.)
Physical Description

• Type: Reciprocating, 18 cylinders, W-type, liquid cooled, supercharged
• Power rating: 1,864 kW (2,500 hp) at Unknown rpm
• Displacement: 47.5 L (2,898 cu in.)
• Bore and Stroke: 145 mm (5.71 in.) x 160 mm (6.30 in.)
• Weight: 1,196 kg (2,633 lb) Approximate

 

[BiffF15]

That's great, and thanks JohnBr! I thought that was a third valve / cam cover.

Cheers,
Biff

 

[Old Wizard]

 

[Tony Kambic]

Mitsubishi Ha 42 Model 41 Ru (Ha 214 Ru), Radial 18 Engine
Dimensions

• Other: 52 3/4 x 92 5/8in. (134 x 235.2cm)
• Approximate (with stand): 160.02 x 218.44 x 161.29cm (5ft 3in. x 7ft 2in. x 5ft 3 1/2in.)
• Approximate (Weight on Stand): 1551.3kg (3420lb.)
• Diameter 134 cm (52.75 in.), Length 235.2 cm (92.63 in.)

View attachment 382140

This engine was recently taken out of storage at NASM, cleaned up, and loaned to a Museum in Japan for display.

 

[johnbr]

That is good to here.