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Letum · 02-03-10, 03:38 PM

Regarding 'overcharging' diesel engines.

Yes, I think that is outlandish.
Aircraft engines where built with mechanisms to run them at speeds that
reduce the service time. They where designed that way. It wasn't some
modification or tweak. It was done in one of three ways; by removing
the manifold pressure limitations (i.e Spitfire V), by injecting methanol
and then water to prevent knock (i.e. P47) or by increasing the
supercharger speed and injecting cold fuel after the supercharger to
prevent knock (i.e. FW190).

Uboat engines had no mechanism to run them at speeds that would
reduce the service time. It is inconceivable how this could be changed in
the field or even at port.
You can't add anything to the motor as you don't have an injection
system and without a protective layer methanol would very quickly
corrode the engine (there was hardly enough chromium in Germany to
proof aeroplane engines, let alone uboats). You can't run the
supercharger any faster or your engine will just knock and there is no
point opening the throttle beyond what the engine can suck in.

Better fuel might help (the uboats got crappy fuel), but your hardly going
to sit there with a bucket of premium ready, even if you did get your
hands on some. How would you put it in anyway?

If it was possible and it was done, uboat.net would know about it.
It wasn't.

The concept of overcharging engines in general isn't wild fantasy, but
the idea that uboat engines could be, or where, overcharged is fantasy.

02-03-10, 03:38 PM	#16
Letum Navy Seal Join Date: Feb 2005 Location: York - UK Posts: 6,079 Downloads: 43 Uploads: 0	Regarding 'overcharging' diesel engines. Yes, I think that is outlandish. Aircraft engines where built with mechanisms to run them at speeds that reduce the service time. They where designed that way. It wasn't some modification or tweak. It was done in one of three ways; by removing the manifold pressure limitations (i.e Spitfire V), by injecting methanol and then water to prevent knock (i.e. P47) or by increasing the supercharger speed and injecting cold fuel after the supercharger to prevent knock (i.e. FW190). Uboat engines had no mechanism to run them at speeds that would reduce the service time. It is inconceivable how this could be changed in the field or even at port. You can't add anything to the motor as you don't have an injection system and without a protective layer methanol would very quickly corrode the engine (there was hardly enough chromium in Germany to proof aeroplane engines, let alone uboats). You can't run the supercharger any faster or your engine will just knock and there is no point opening the throttle beyond what the engine can suck in. Better fuel might help (the uboats got crappy fuel), but your hardly going to sit there with a bucket of premium ready, even if you did get your hands on some. How would you put it in anyway? If it was possible and it was done, uboat.net would know about it. It wasn't. The concept of overcharging engines in general isn't wild fantasy, but the idea that uboat engines could be, or where, overcharged is fantasy. __________________