[ARCHIVED THREAD] - Video of an overhauled Pratt & Whitney R-4360-20 - first start - 28 cylinders of pure win! (Page 2 of 2)
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Doesn't it make you feel good that you are a citizen of a country that can make and design Great things when they want or have to. Well there are a lot of really neat WWII era power plants made by other countries. The Junkers Jumbo, Daimler Benz 60x, Rolls Royce Griffon.... |
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And, to hear that type of engine in a Corsair, tuned, timed, and in full glory...  http://www.youtube.com/watch?v=FQxb-V-rZqA
CJ I'll be changing my log on sound to the take off portion. |
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Awesome! Thanks for sharing...
I've actually got a couple CDs with startup and flyby sounds of various US and German WWII aircraft...put them on my iood. ..great to put a smile on the face when you are at work 
Picked them up at an airshow at Duxford...that was an amazing experience! |
| Such a neat sound, the little airport I used to do aircraft restoration at had a Super Corsair that the owner would fly quite often. The sound of that Wasp supercharged radial was awesome, even more impressive is the power when 300 gallons of water were injected into it for a little power boost. The owner/pilot is a very nice guy. |
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And, to hear that type of engine in a Corsair, tuned, timed, and in full glory... http://www.youtube.com/watch?v=FQxb-V-rZqA
CJ I hold that video responsible for the drool that has accumulated on the floor in here.  I hope that Apple won't void their warranty for the IPhone bc of what I just did. I guess I held the throttle too tight ;) Posted Via AR15.Com Mobile |
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would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg The R-4360-20 is supercharged. It uses a Stromberg four-barreled pressure-type carburetor with an automatic mixture control. This is considered to be an early form of fuel injection as the carburetor does not have a float bowl. This feature will allow the carburetor to perform under zero g and upside down conditions. Metered fuel from the carburetor is carried through internal passages and is thrown centrifugally through small holes between the supercharger impeller blades to mix with the combustion air. The fuel-air mixture, after passing through the diffuser to the blower rim, is carried to the cylinders through seven intake pipes, one for each bank of four cylinders. I am pretty sure that once the fuel / air mixture is forced into the intake pipe that there's enough pressure to keep the pressurized mix constant until it's inducted into the cylinder. I am also pretty sure that if you ran it through a computer simulation you would find all sorts of small problems and you could fix them too. You can read the Barny explanation here - http://en.wikipedia.org/wiki/Pressure_carburetor 
Or a more technical explanation here - http://www.flightglobal.com/pdfarchive/view/1941/1941%20-%202101.html |
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would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg We had a cutaway like that in my shop class in high school. 
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Quoted: You guys do realize that the R4360 (The engine on the test stand in the first video) was not a Corsair engine right? They just said they are going to put it in one.  The Corsair used the R2800 normally. Only the Super Corsair used the R4360 and it was never actually accepted for service or produced in any quantity. The R4360 was used in the B-36, B-50, and in many tankers and transports. The B-36 used 6 R4360s and the Spruce Goose used 8!  I was going to post something similar. There was a Corsair variant called the F2G that did use the R-4360, however. m |
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would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg Fuel Flow at T.O. tells you weather the engine is drinking correctly. Deck pressure and fuel flow together gives a fairly good picture that everything is getting what its supposed to be getting. |
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You guys do realize that the R4360 (The engine on the test stand in the first video) was not a Corsair engine right? They just said they are going to put it in one.
The Corsair used the R2800 normally. Only the Super Corsair used the R4360 and it was never actually accepted for service or produced in any quantity. The R4360 was used in the B-36, B-50, and in many tankers and transports. The B-36 used 6 R4360s and the Spruce Goose used 8! I was going to post something similar. There was a Corsair variant called the F2G that did use the R-4360, however. m Captain Obvious to the rescue.  
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How's an engine like that lubricated? Is it like a Big weedeater engine with oil & gas mixed? Or does it have direct oil injection into main bearings, piston shirts. You have never heard of a dry sump engine? Nope. Thank you! wiki has a decent article that describes this. Makes sense now.
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would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg We had a cutaway like that in my shop class in high school. Good cutaways are works of art. The masterpieces not only show all of the mechanical engagements, but leave enough of the bearing surfaces intact that the assembly can be operated slowly to demonstrate timing. These demos are now child's play to a good cad/cam operator, but there's nothing like touching it in full scale to really absorb what's going on. |
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How's an engine like that lubricated? Is it like a Big weedeater engine with oil & gas mixed? Or does it have direct oil injection into main bearings, piston shirts. You have never heard of a dry sump engine? Nope. Thank you! wiki has a decent article that describes this. Makes sense now.You didn't take auto shop in high school? Turn in your man card. |
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Okie doke.
To begin, that is an awesome engine!! 28 cylinders! I can't imagine what it would do in a Corsair. BUT, as has already been said, that really wasn't the standard engine for the plane. That honor would go to the Pratt and Whitney RW 2800 Twin Wasp. You can also find that engine in a P-47, among others. |
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Quoted: Quoted: Quoted: Quoted: How's an engine like that lubricated? Is it like a Big weedeater engine with oil & gas mixed? Or does it have direct oil injection into main bearings, piston shirts. You have never heard of a dry sump engine? Nope. Thank you! wiki has a decent article that describes this. Makes sense now.You didn't take auto shop in high school? Turn in your man card. I lived in the country on 30 acres and took aerospace science instead. Think you can take mine from me?  |
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would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg I realize that some of you have such a grasp on mechanics that you could probably repair one of these things in your sleep, but I'm just amazed at the genius it took to develop such engines and refine them to the extent we did before the proliferation of jet propulsion. And to think it was done during the Second World War. American engineering really impresses me. |
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Quoted: Quoted: Quoted: would someone explain how the induction system on such a large radial engine works? the wiki page states (link), Fuel system: Stromberg four-barrel pressure carburetor i don't understand, since there is no "central point" to distribute from, how you ensure that the nearest cylinders/banks aren't rich and the farthest aren't lean. it seems very difficult to envision how to do this across a range of RPMs. i realize the engine is supercharged –– and the forced induction has to help with fuel distribution –– but still... ar-jedi http://upload.wikimedia.org/wikipedia/commons/3/3c/Pratt_%26_Whitney_R-4360_Wasp_Major_1.jpg http://upload.wikimedia.org/wikipedia/commons/d/d9/Biggest_rotary_cutaway.jpg We had a cutaway like that in my shop class in high school. Good cutaways are works of art. The masterpieces not only show all of the mechanical engagements, but leave enough of the bearing surfaces intact that the assembly can be operated slowly to demonstrate timing. These demos are now child's play to a good cad/cam operator, but there's nothing like touching it in full scale to really absorb what's going on. Yes they are. Evergreen AM has/had? a motorized cutaway that was really cool to watch. |
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I love it when the business next to us fires up their P-47, Damn that thing is loud. The A-1 Skyraider they have is a beast too, not to mention the F-4 Corsair. The Corsair is fun to watch as they unfold the wings and work on the engine. they'll spend an hour just running it up and shaking our building. I'd love to work there....sigh. I'll have to get off my butt and go shoot some video for you radial freaks!
G |
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The maintenance on that thing must be a nightmare! Yes, just changing the spark plugs on a couple of those engines is a royal PITA! I much preferred working on the 1820's or even the 3350's.
However I think all the big radials sound sweet, just some more than others. I remember the first time I did a mag check on a AD-1. WOW, I had an ear to ear grin for a week!
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The DC-7 had R-3350s with turbo-compounding.......
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How's an engine like that lubricated? Is it like a Big weedeater engine with oil & gas mixed? Or does it have direct oil injection into main bearings, piston shirts. You have never heard of a dry sump engine? Nope. Thank you! wiki has a decent article that describes this. Makes sense now.You didn't take auto shop in high school? Turn in your man card. Some rich Houston oil man chartered a DC-7 from Houston to New York City. Dad was at the time an FE.....the worry was never about fuel,but running outta oil. Read up on the sagas regarding B-377s and C-97s flying Hawaii/CONUS,with conkouts happening in the middle. |
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http://www.enginehistory.org/r-4360.shtml
A lot of great information on the R-4360 engine. It's a fucking great web page! http://www.enginehistory.org/r-4360ops1.shtml Operators manuals here. |
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http://www.enginehistory.org/r-4360.shtml A lot of great information on the R-4360 engine. It's a fucking great web page! http://www.enginehistory.org/r-4360ops1.shtml Operators manuals here. AWesome links! Here's the crankshaft and crankcase from the R-4360. Astounding. 
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And I used to bitch about balancing two carbs on my bike... No shit, or two carbs on my old "wanna be" street rod!!! That thing has 28 cylinders!!!!! Waayyyy coool!!!!!!! there is only one carb on this engine. no need to synchronize/balance. ar-jedi |
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Quoted: Quoted: Quoted: And I used to bitch about balancing two carbs on my bike... No shit, or two carbs on my old "wanna be" street rod!!! That thing has 28 cylinders!!!!! Waayyyy coool!!!!!!! there is only one carb on this engine. no need to synchronize/balance. ar-jedi I thought someone above mentioned four carbs? |
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In the mid 70s just outside Lewisville TX, there was some old farmer who bought several hundred to thousand of these after the war and had them sitting in a field. He eventually melted them all down around 1976-77?
You have to wonder how much more money he would have, if he left a couple dozen. Now there is a god dam Walmart were that field used to be. |