Re: M26 Pershing
 

Junkers Jumo 207 is a lightweight 6 cylinder diesel engine that was rated at 1000hp for takeoff. The Junkers Jumo 208 was rated at 1500hp for takeoff.

The Junkers Jumo 207B was the engines used in the Ju-86p super high altitude photo recon plane. The Brits had to develop a special version of the Mosquito just to get up to altitude to catch it.

With the Junkers Jumo 207B this would have given the Germans a 700 hp range diesel engine.

With the Junkers Jumo 208 the Germans could have had a 900-1000hp range engine.

Can you imagine a Panther or Tiger II with a 900hp or 1000hp engine?

And as for aero engines in tanks?

Continental R975 in the Sherman was a radial aircraft engine
Rolls Royce Meteor in the Cromwell was a tank version of the Merlin.

Re: M26 Pershing
 

A tiger with 1000 hp would be a piece of shit if it were a petrol engine. Remeber a gas engine only get a 1:10 air combustion ratio while a diesel gets 1:20 and air combustion is needed for torque and torque is needed to pull something with heavy resistance. Petrol engines burn at very high heats and heat the pistons up like a microwavable pizza causing a horrible explosion in the engine. They also burn quickly so they run n out of fuel quicker. Diesels do the opposite burn slow and give long range. and aero engines need to be greatly moddified for use in a tank.

Re: M26 Pershing
 

spammer :PPPP

Re: M26 Pershing
 

Im not sure what your trying to say here.

Gasoline engines can run from a 7.5: CR to a max of about 14:1CR. For anything over 10:1CR you will need to run 92 octane fuel or better to prevent detonation. And you can back off the cam timing if it does start to detonate. For instance I have a Ford 5.0L V-8 rated at 225hp. If I increase compression ratio from 9.0:1 to 10:1 I only gain roughly 10hp and about 12 ft. lbs. of torque. If I install a more radical cam I can pick up on average of 15 hp and 15-20 ft. lbs. of torque. If I put on a better flowing cylinder head I can gain 35hp and 20-30ft. lbs. of torque.

The engine is a complete package. The balance of all the components is what makes good power. And yes it does produce more heat. To combat that I run a cooler thermostat and/or a bigger radiator. If thats not enough I can mount a fan on radiator to incrase the airflow through the radiator. If thats not enough I can mount a radiator for the oil and cool it as well.

A properly built engine will not overheat, will not snap crankshafts, will not blow head gaskets, and will not throw rods out of the side of the block. The early Maybach V12 in the Tigers and Panthers was a tempermental engine. When the HL-210 P45 came out it was considered to be tempermental and trouble prone and engine failures were not uncommon. But the design was tweaked and when the HL230P45 was released in the Tiger I and the HL230P30 in the Panther it was a good motor. Main problem was rushed design.

The Junkers Jumo 207 was a sound design and the only successful diesel aircraft engine. It had been around since about 1939 so there was plenty of time to work the bugs out. It was considered very fuel effecient and reliable and was installed in the Dornier flying boats flying the transatlantic routes before the war. The Junkers Jumo 208 was an enlarged version of the 207 that made almost 50% more power. With most aero engines into tank making between 60% and 75% of what they made in the aircraft you can figure that a 207 motor would have made 600-700hp and a 208 would have made about 900-1000hp. So you would have had the same or better power to weight ratio and the benefit of diesel fuelled vehicle not bursting into flames.

Re: M26 Pershing
 

To prevent an explosion just use a diesel. Who gives a shit about hp in a tank it is useless without torque. Petrol engines rpm goes through the roof so damn easy while a diesel can have half the rpm and be going faster. Hp is usefull in the air because there is no resistance and you need rpm to go fast, but on the ground in a tiger you have 58 tons of resistance. People who think hp is usefull in a tank are extremly misinformed. and btw a diesel doesnt have a timing system.

Re: M26 Pershing
 

Couldn't aircraft be used as a counterpart? Wasn't that what mainly took out the German heavy tanks anywaY?

Re: M26 Pershing
 

Hp and torque go hand in hand. For example a Rolls Royce Griffon in a Spitfire made 2,250hp at take off and 4,700 ft.lbs of torque. Most petrol engines make as much torque as hp but it is more common fo the torque to be a good deal higher than the horsepower. The Meteor tank engine, which was based off of the Merlin was rated at 650hp for 1,650cid. Torque would be on the order of 2,000ft.lbs. The Maybach HL230P45 was rated at 700hp and 1400cid(23.10L). I would expect that motor to put out close to 2,000ft.lbs of torque.

And as you mentioned before a Diesel works better under load than a petrol engine so I would expect the Diesel to make even more torque at the same horsepower rating as the German Maybach or the British Meteor.

And it looks like the Panther F or Panther II would have gotten a Maybach HL 234 P45 that used a gear driven supercharger to achieve 1,000hp. Being supercharged I would expect that motor to make close to 2800ft.lbs. of torque.

And aircraft engines were usually operated at 3,000rpm or less. Higher than than and you overspeed the propellor and over 4,000rpm the props can fly off if not careful. Rpms on gasoline engines are limited by a govenor.

Re: M26 Pershing
 

Point is Tiger nedds a damn diesel engine to properly operate.

Re: M26 Pershing
 

Agreed :nodding:

Re: M26 Pershing
 

Actually it was artillery AND aircraft. But I wouldn't let that stop the dev team from creating a Jumbo, M4 (76), and an M26.

And speaking of armor that needs to be modeled:

http://www.fas.org/man/dod-101/sys/land/m24chaffee.jpg

M24 light tank w/ 75mm main gun. In the ETO from late '44 on.