Pratt & Whitney R-4360-20

Gregory

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Jul 18, 2012, 8:38:27 PM7/18/12

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First start after an overhaul..

http://vimeo.com/16117810 02:02

Imagine that.. four rows of seven cylinders. As an older gent said
at the airshow.. "that's when we used to make things in this country."

Also... http://www.google.com/search?q=R-4360-20

-G

sambodidley

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Jul 18, 2012, 10:10:56 PM7/18/12

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"Gregory" <flights...@bkwds.comcast.net> wrote in message
news:gile081faktdsn4h2...@4ax.com...

I'd like to know what the firing order is on that engine.

Gregory

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Jul 19, 2012, 5:31:41 AM7/19/12

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On Wed, 18 Jul 2012 21:10:56 -0500, "sambodidley"
<tail...@stallout.net> brought the following to our attention:

>> Imagine that.. four rows of seven cylinders. As an older gent said
>> at the airshow.. "that's when we used to make things in this country."
>>

>> http://www.google.com/search?q=R-4360-20

>>
>
>I'd like to know what the firing order is on that engine.
>

You'd have to get a hold of a shop manual, Sam. That information is
becoming scarce in these modern times of voodoo science.

Oops.. getting OT in a hurry. Back to the engine, this was the last of
the big and widely used engines before the "jet age" took hold.

http://en.wikipedia.org/wiki/Pratt_%26_Whitney_R-4360_Wasp_Major

Near the top of the list is: http://en.wikipedia.org/wiki/Boeing_377

http://en.wikipedia.org/wiki/File:Boeing_377_N1033V_PAA_Heathrow_12.9.54.jpg

http://en.wikipedia.org/wiki/File:Boeing_377_Stratocruiser_(B-29)_American_Overseas_1949-50.jpg

Are we reading the spec correctly here? R-4360-20 - 3,500 hp (2,610 kW)

which is ~2.5 Megawatts of power? x 4 = 10 Megawatts?

Here are the figures... 3500 HP x 743 W / HP = 2,600,500 Watts

x 4 engines = 10,402,000 Watts (at sea level?)

-G

Ken

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Jul 20, 2012, 9:37:50 PM7/20/12

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On Wed, 18 Jul 2012 21:10:56 -0500, "sambodidley"

<tail...@stallout.net> wrote:

>I'd like to know what the firing order is on that engine.
>

A few web sites say it's....

1 - 10 - 5 - 14 - 9 - 4 - 13 - 8 - 3 - 12 - 7 - 2 - 6

Ken

sambodidley

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Jul 20, 2012, 10:00:57 PM7/20/12

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"Ken" <Are...@kidding.me> wrote in message
news:6u1k08leirvnvddqi...@4ax.com...

I think that would be a few cylinders short of a firing order.<g>
Sam

Ken

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Jul 21, 2012, 10:30:12 AM7/21/12

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On Fri, 20 Jul 2012 21:00:57 -0500, "sambodidley"
<tail...@stallout.net> wrote:

>> 1 - 10 - 5 - 14 - 9 - 4 - 13 - 8 - 3 - 12 - 7 - 2 - 6
>>
>> Ken
>
> I think that would be a few cylinders short of a firing order.<g>
>Sam

They refer to it as a twin 14 cyl....so as I see it there are two #1
cy, etc. At least that's the way the web sites talk about the layout.

Ken

ChuckP

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Jul 23, 2012, 8:08:04 AM7/23/12

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"sambodidley" <tail...@stallout.net> wrote in message
news:ju7qni$6j0$1...@speranza.aioe.org...

Great question. Found it here.
http://www.enginehistory.org/r-4360.shtml

Chuck

Tom P

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Jul 23, 2012, 9:47:31 AM7/23/12

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Excellent - I'm trying to understand the logic of the firing sequence,
we see 4-5 are cylinders D6 and A3 almost opposite each other, whereas
10-11 are B2-C6 which are nowhere opposite. Is this because B and C are
adjacent banks, while A and D are opposite ends of the crankshaft?

Tom P

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Jul 23, 2012, 9:49:19 AM7/23/12

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On 07/23/2012 02:08 PM, ChuckP wrote:
>

oh and I really have to say looking at the photos, this is the most
awesome piece of machinery.

ChuckP

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Jul 23, 2012, 12:27:19 PM7/23/12

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"Tom P" <wero...@freent.dd> wrote in message
news:a752vk...@mid.individual.net...

I think you may have it. The crank shaft has 4 throws. Each row of
cylinders (A thru D) are on the same crankshaft throw so I suspect that one
has to look at the firing sequence within each crank throw. May be some
consideration as to angles between the rows as well. Makes my head hurt,
but more agile minds with A&P ratings may have it sorted out. I am secure
in my knowledge of my power mower however.

It is amazing how much info on this engine I found. I was led to much of it
by my older brother who flew behind 4 of these engines as in a KC-97 USAF
pilot many years ago.

sambodidley

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Jul 23, 2012, 2:23:04 PM7/23/12

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"ChuckP" <druc...@comcast.net> wrote in message
news:juju1a$uhr$1...@dont-email.me...

I thought the R-2800 we had in our F4U Corsairs was a complicated piece
of machinery. Only 2 banks of 9 cylinders on it. I'm glad I never got into
anything like this one.
Sam

Ken

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Jul 23, 2012, 8:25:15 PM7/23/12

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On Mon, 23 Jul 2012 13:23:04 -0500, "sambodidley"
<tail...@stallout.net> wrote:

> I thought the R-2800 we had in our F4U Corsairs was a complicated piece
>of machinery. Only 2 banks of 9 cylinders on it. I'm glad I never got into
>anything like this one.
>Sam

The Russkies made a "112-cylinder diesel boat engines featuring 16
rows with 7 banks of cylinders" radial. :-)

Ken