[Amps] LK 500 ZA heat

[jeremy-ca]

Tom, you are so predictable. When you cant come up with a real answer you 
resort to personal attacks.

I dont know when the last time you lifted the hood in a car but horsepower 
robbing engine driven fans have been out of favor for around 25 years. The 
choice of all manufacturers is an electric pulling fan. This also holds for 
500-800 hp and higher street rods with big V8's stuffed in very restrictive 
spaces. The Internet is full of studies of the comparisons between push and 
pull cooling.

The air flow analogy is valid no matter the platform.

Carl
KM1H



----- Original Message ----- 
From: "Tom Rauch" <w8ji at contesting.com>
To: "jeremy-ca" <km1h at jeremy.mv.com>; "dave arruzza" <w1ctn at yahoo.com>; 
<amps at contesting.com>
Sent: Monday, August 13, 2007 3:28 PM
Subject: Re: [Amps] LK 500 ZA heat


>>> If you pressurize the inlet of a fan or blower, it greatly
>>> increases outlet pressure. If you draw on the outlet it
>>> hardly changes airflow. The inlet fan largely sets the
>>> volume of air. The same is true for restrictions. If you
>>> restrict an inlet, there is a huge air volume change. If you
>>
>> Tell that to the millions of car owners with electric fans that pull the 
>> air thru the restrictive radiator. Tests have long proven that trying to 
>> push the air thru the radiator is a bad idea.
>
> Carl,
>
> It's just silly to drag in unrelated arguments against something that is a 
> clearly known fact, especially something so easy to prove with minimal 
> research or experimentation.
>
> Cars suck air through the radiator because that's where the drive system 
> is. They aren't about to extend a shaft through the middle of the 
> radiator, so they burn up some extra horsepower with a less efficienct air 
> system. Also the movement of the car through the air is what does 90% of 
> the air movement, the only real thing the fan does is cool the system when 
> the vehicle is stopped or at slow speed. That's also when BTU's generated 
> by the engine is less, since the fuel volume being burned is lowest.
>
> Analogies to a 200 horsepower engine in a system that is not pressure or 
> noise critical and can't put the fan in the optimum place is a tremendious 
> waste of time.
>
>> Placing a small fan in exhaust mode has also saved many sweep tube rigs 
>> from premature tube failure. Ask anyone who used Drake C Line in contests 
>> for example.
>
> Anything is better than nothing Carl. He was talking about adding a fan to 
> a system that already has a fan, not a convection system like the Drake. 
> This was just another lame meaningless analogy.
>
> It is an undisputable fact air movers act like I outlined, and something 
> everyone designing or modifying a cooling system should know. Even someone 
> working on a car.
>
> 73 Tom
>
>