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so 7 star/bank engine with 6 cylinder each row. never have seen and known before. 4000 hp and a weight of 5,4 to - WOW great technical stuff
Another big lump was the Napier Sabre that was the power plant for the WW2 Hawker Typhoon. Two flat twelves and two cranks. Sleeve valve Engine. Weight 2360 lbs, HP 2200 @3700 rpm, Bore 5" stroke 4 3/4 " a tad over 36 litres. 6'8'' long, 3'4"x 3'7" Not sure if there are any still running but it would be nice the hear it! Flat 12 overload for Paul.
That Napier Sabre was a very complicated engine!! One of the recip horsepower winners for aircraft. I read after two failed starts the plugs had to be removed, and the cylinders and sleeves had to be re-oiled or would seize on the third try.
this is technical art of the best I think we may create a new thread: wonderful engines but has nothing to do with this thread here - even it is soooooo great
The gold isn't that gold in person and its also not my favourite look but its correct for the year. I guess it was cheaper and easier to eliminate almost all of the silver although yellow zinc is more durable. Image Unavailable, Please Login
A Rolls meteor v12, basicaly a non superchaged merlin for a tank. There are still quite a few about for not huge $$ Kinda makes one cry when you think of all the (one cheap) allisons blown up in powerboat racing
I believe the meteor (tank application) turns the opposite direction to the one used in a plane. And I would probably end up with a panhead or knucklehead before buying an engine like that! Unless it was a warplane engine of course.
Image Unavailable, Please Login It’s called a master rod. One main rod and others connected to it. That’s one approach. Others have multiple rods attached to a very different looking crank pin. Here’s a master rod.
There is a school of thought that the allison is superior to the merlin, but it didnt have the two stage supercharger so never lived up to its potential.
have a look here: https://de.wikipedia.org/wiki/Sternmotor it is a good animation or here: http://deacademic.com/dic.nsf/dewiki/1331400 thise are only 5 cylinder, but with it works equal
Thanks Newman and turbo-joe....picture and video clarified my simple mind quite nicely. Hope you both have an outstanding day!
I'm not a big historian on the Allison and its possible potential. But, it was war, and I am sure if there was room to squeeze any more out of an engine they would have done it. It suited the P40 and was a great engine. The merlin started at around 980- 1000 hp something like that, it was known as the PV 12. Continually developed until it was putting out over 2000hp in 27 litre form until there was nothing more to squeeze. So then the Griffon came in at 36 litres and the rest they say is history. It had opposite rotation to the Merlin so this caused some excitement when pilots wound the rudder bias on for a merlin's normal take off, only to have the aircraft misbehave as it launched down the runway. Very exciting for some. I would like to know if there was any Griffons installed in the P51. Anyway I wont hijack Paul's thread any further.
The Griffon was a much heavier engine too, like going from a small block to a big block. I know some went in later mark spits, some with counterotating props and I think it went into the hawker typhoon?. The grifon had a long post was career in the shackelton which they say was a development of the lancaster. I know South Africa used them into the early 90's. What I had heard about the allison is it did not have the two stage supercharger of the developed merlins so lacked that motors high altitude performance. Theres probably a lot more to it than that. I read that if you're building a really powerful merlin today for unlimited racing allison rods are used. But you make a great point. It was war, and if the allsison could be developed so well surely that would have been easier than license building the merlin, esp as there were numerous detail changes to produce the merlin in the USA. The first mustangs came with allisons and the brits didnt like them, somewhere along they way they put a merlin in and as you say the rest is history. The mustang wing really worked at altitude, as did the merlin. P38's had turbosupercharged allisons, but didnt work out in europe because the cold air up high froze oil lines etc. Later I read the allsons were really well , developed to work at altitude in the p38s, but by then the p38 was dead horse in europe. Yeah a p40 is one awesome plane and reputedly a choice warbird to fly today. They were selling those allisons for small bucks in the 50s and 60s. Kermit weeks has a warehouse full. I think Bill Harrah put two into Thunderbird his wooden boat on tahoe. Thunderbird still exists and can be chartered on Tahoe, although sadly no longer allison powered. Cool stuff.
Heads on and checking cam timing. Ill pull the heads off and do the playdoh valve to piston clearance check then put the heads on with new gaskets. I have a pair of new ones that were sacrificed in the past to do this clearance check on any flat 12. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
