Pratt & Whitney R4360 Full Start July 11, 2008 

At 28 cylinders, this is the largest production reciprocating engine to be made. Four rows of seven cylinders, the 4360cu/in. engine produced 3000hp in this earlier version with 7 high-tension mags. Later engines produced 4300hp using low-tension magnetos. There is quite a bit of information about these engines both online and in print. Thanks for viewing

Steve Phillips is the engineer that restored the R4360. He did so with very little documentation and no help from anyone that was an R4360 engineer. These engines are complicated and the vets from WWII don't remember much from 60 years ago. In addition, no one was charged with knowing how to address all aspects of the machine. Steve's ability to do mechanical archeology is impressive. Thanks for viewing.

Nothing on this planet sounds as good as a Wasp Major coming to life.

We ran out of time to modify our prop to a test club. That'll happen in the coming weeks. Thanks for your interest.

Thanks NcalBiker. We received this engine from a museum down south that was deaccessioning it from their collection. It was part of the H.Hughes Spruce Goose cache of material that was given away when Summa Corp. was going to cut up the Spruce Goose. Our museum purchased it and then the "restoration" began. Take a look at our other videos - on my name as well as the PenngrovePower name on RU-vid. You can go to our website as well and see some images of the machine being refurbished.

R-4360 is a type designation for the engine: R for Radial arrangement of pistons, 4360 for the displacement in cubic inches. 4 rows of 7 cylinders each=28 big, air-cooled cylinders. These engines, although bigger and more powerful than the R-3350, had better cooling due to the fact that each row had only 7 cylinders, instead of 9, and sheet metal ducting guided cooling air where it was needed most.

You chaps are sensational. :-)

CUT IT UP??? Where's my gun. Glad it went to Oregon where it will be safe! I hadn't heard that. Until now, I wasn't aware of where you were. I get down to that area on the occasion. Looking forward to getting all fired up at one of your fire ups. Again, great video coverage. Hello from Eureka.

Great clip,love the way you can see every explosion,without a prop acting as a giant cooling fan how long can you "safely" run this big beauty?

You mention that the engine was stored "in the can". Can you elaborate? Where was it found? How was it discovered? I have often wondered where people find these treasures, and have thought about the restoration and saving of these works of art over the years. A P&W radial is indeed a bit larger than a 5hp hit and miss, but it would sure be as much fun to fire up when finished. Great video. Thanks for sharing, it got me fired up as well...

Hat off to Pratt & Whitney team.

What a monster engine!

damn, its awesome to hear this engine on the seafury dreadnaught, especially on takeoff!

Wow Pretty cool. My first tour of duty 1954 was Hickam AFB HI. I teethe a C124 with R 4360 -20WA . Which meant oily cross over tubes on the bottom. and dreaded B-4 cylinder changes. The most dreaded of all to change the cylinder and then find a cylinder barrel seal on the engine stand. Go shaky!!!!

Little documentation? I have a copy of an R-4360 overhaul manual that is a reprint. A good number overhaul manuals can be found in reprint for a reasonable price.

its cubic inch displacement of all the cylinders

for a while i didn't know if it was going to catch fire, blow up or run

@NastyNixels I've been wondering: why do radials seem so difficult to start? Every video I watch, they seem to take quite a lot of cajoling to get them running. Is it a result of design characteristics?

SMOKIN THUNDER sounds like 7 big block chevys

ok! How many bhp in this engine?

What is 4360? It's power in hp or type?

How many MPG ?? ... =P

3,500 to 4,000 Bhp

-50 mpg jk