Most used engine in WW2?

[Bosco123]

What was it? I think it was the Pratt and whitney Double Wasp (cain't remeber the engine number), but there is the Allison and the DBs.

What was it?

[Saxman]

The P&W R-2800 is what you're thinking of. And yes, it was one of the most widely-used engines of the war:

    * B-26 Marauder
    * C-46 Commando
    * Douglas A-26 Invader
    * F4U Corsair
    * F6F Hellcat
    * F7F Tigercat
    * F8F Bearcat
    * P-47 Thunderbolt
    * P-61 Black Widow
    * Lockheed Ventura/B-34 Lexington/PV-1 Ventura/PV-2 Harpoon
    * SB2A Buccaneer (A-32 variant for the USAAF)
    * Vickers Warwick

[fyvsix]

They made 18000 liberators, so that's 72000 of those engines. Anyone higher then that?

[Saxman]

I think he means use in number of different TYPES to use the engine, not the literally most-produced. Keep in mind the list below:

    * B-26 Marauder = 5288 built x 2 engines = 10,576
    * C-46 Commando = 3181 x 2 = 6362
    * Douglas A-26 Invader = 2452 x 2 = 4904
    * F4U Corsair = ~10,000 during WWII
    * F6F Hellcat = 12,275
    * P-47 Thunderbolt = 15,686
    * P-61 Black Widow = 742 x 2 = 1484
    * Lockheed Ventura/B-34 Lexington/PV-1 Ventura/PV-2 Harpoon = ~1700 x 2 = ~3400
    * SB2A Buccaneer (A-32 variant for the USAAF)
    * Vickers Warwick = 712 x 2 1424

[1pLUs44]

The P&W R-2800 is what you're thinking of. And yes, it was one of the most widely-used engines of the war:

    * B-26 Marauder
    * C-46 Commando
    * Douglas A-26 Invader
    * F4U Corsair
    * F6F Hellcat
    * F7F Tigercat
    * F8F Bearcat
    * P-47 Thunderbolt
    * P-61 Black Widow
    * Lockheed Ventura/B-34 Lexington/PV-1 Ventura/PV-2 Harpoon
    * SB2A Buccaneer (A-32 variant for the USAAF)
    * Vickers Warwick

+1

[Nashwan]

What was it? I think it was the Pratt and whitney Double Wasp (cain't remeber the engine number), but there is the Allison and the DBs.

Counting the Packard built V-1650, 168,000 Merlins were built, powering variants of:

Armstrong Whitworth Whitley
Avro Lancaster
Avro Lincoln
Avro Tudor
Avro York
Boulton Paul Defiant
Bristol Beaufighter
Curtis P-40 Kittyhawk
de Havilland Mosquito
de Havilland Hornet
Fairey Barracuda
Fairey Battle
Fairey Fulmar
Handley Page Halifax
Hawker Hurricane and Sea Hurricane
Hispano Aviacion Ha 1112
North American Mustang
Short Sturgeon
Supermarine Seafire
Supermarine Spitfire
Vickers Wellington
Westland Welkin

[MiloMorai]

There was 114,073 P&W R-2800 engines produced from 1941 to 1945. During the same time period, 166,504 P&W R-1830 engines were built. This is slightly less than the number of Merlin/Packard-Merlins built.

[Bosco123]

Exacly, so what was the most widley used?

[Noir]

If you include car engines this can go far 

[MiloMorai]

http://www.ordersofbattle.darkscape.net/site/sturmvogel/airrep.html#Ch7

BMW 801 - 27,783

DB types - 71,478

[Gabriel]

Especially if you get into derivatives, like the HS 12Y/Klimov

There were an awful amount of 1710s too, but I think the Merlin would probably be the most used. 

[SectorNine50]

Especially if you get into derivatives, like the HS 12Y/Klimov

There were an awful amount of 1710s too, but I think the Merlin would probably be the most used. 

The Merlin changed slightly over the course of the war though, so I'm assuming there are different model numbers, correct?

I wouldn't be surprised if the Merlin was the most used, they threw that engine in anything they could!  And with good reason, look at what happened to the Pony when they did!

[Greebo]

Wiki reckons there were 173,618 R-1830 engines built and that it was the most produced aircraft engine.

[SgtPappy]

SectorNine, in terms of American engines, the number after 'R' (for Radial) in this case was the cubic inch displacement of the engine. Since it was (and still is) nigh impossible to accidentally design 2 engines with the same displacement, the displacement became the standard number of classification.

For the Merlin, or V-1650 to the US, there was only that one kind. There were V-1650-3's/7's etc as there were Merlin 45's/63's etc but the engine is the same. This is just like R-2800-8/10/18W's... all the same engine with different mods. So really, if the digits in between the dashes changes, it's a different engine altogether.