In a message dated 11/8/2004 2:32:32 PM Central Standard Time,
13brv3@bellsouth.net writes:

<< As I've suggested before, I don't see saving power consumption as a reason
 for considering an EWP, especially considering the losses in converting mech
 energy to electrical and back again.  
  
 I think the biggest chance to save power on cooling is if Mazda is providing
 way more than is necessary at our cruise rpms.  I have to suspect that's the
 case, since Todd is running just fine with only 9.X gpm.  
  
 
 Al (I swear I will not say another word about EWPs; that beheading thing is
 just too scary)
 
  
 
 Ha.  Don't worry, my wife would kill me if I stained the carpet :-)  
 
  
 
 As for EWP's saving power, you'd think that the first people to jump on that
 would be the racers.  I know that these pumps are sold to drag racers, but I
 can't say that I've heard of other types of racers using these pumps.  
 
  
 
 Hey Lynn,
 
  
 
 -Are EWP's against the rules?
 
 -Has someone determined that they don't save any HP?
 
 -Has someone determined that they won't cool the engine in racing
 conditions?
 
  
 
 Cheers,
 
 Rusty (just can't have any fun on this list)
 
 
  >>


The rule is that the pump must be mechanically driven. So, no electrics  in
road racing. I think the electric would save about 3 HP at cruise. So long as
not much HP is being produced, the electric might work out OK. The drag racers
use them to get uniform block temps. You cannot actually cool to any great
extent a prostock big block at the 800 or 900HP level. How much heat can you
transfer in 9 seconds? I don't think they even carry the radiator in the car, but
it has been ages since I saw one apart. You can put enough water through it to
keep from breaking a head bolt, or permanently deforming an important part.
NASCAR has the prize for continuos cooling in the 745 HP range. No stock pumps
and no electrics there.
Huge aluminum radiators.

So long as the amount of heat to be transferred is small, the electric would
work OK in my mind. Even a rotary on the street would be fine. But at less
than 29% efficient, 70+% of the fuel leaves through the radiator, oil cooler and
exhaust pipe.
Not a problem for sub 100 HP street work. But the airplane needs close to
100% duty cycle. Maximum continuos HP. You can save a few HP by slowing the pump
a bit, so you can get the HP loss under maybe 2?

Just another electrical device, powered by compressed smoke, to leak down and
fail.

When I was an inspector at Western Electric, the troops would now and then
manufacture a batch of DEDs. Better known as Darkness Emitting Diodes. Very
efficient these things were. Required no power at all to function. Unfortunately
their function was to lay still and absorb light.

Lynn E. Hanover