I haven't looked to see if the blades are moving, but there would be no
wear if there is no power to the motor. (BTW: The blades are fairly tight
and they don't move that easily when you blow on them.)
I'll try to check it out though....
At 04:46 PM 07/14/1999 -0400, you wrote:
>I would ASSume that when the eRam is off, and you are driving, the blades of
>the fan are still turning. The "rush" of air thru the tube would cause the
>fan to turn. Just think of a window fan when the wind blows, the fan blades
>turn. Therefore, the eRam is moving and wearing out. If you attach a
>variable resitor type switch to the throtle cable, you would have variable
>flow. Just a thought... Of course I am not a mechanical engineer and I am
>speaking out of my first part of ASSume.
>
>Joe
>
>
>>>> "Bernd D. Ratsch" <bernd@texas.net> 07/14 4:18 PM >>>
>
>I thought that same thing at first...since I now have one on my truck, it
>really doesn't interrupt the airflow at all...performance is the same with
>it ON (and not operational) as with it OFF the truck.
>
>The variable flow is also a question I had asked Mark Kibort (part owner of
>eRacing) but the boost level would be too low and would also burn the motor
>out quicker than with it only operating at WOT. (Average lifespan is about
>60K miles + or - 10,000.)
>
>I'l be at the Austin meet this weekend with the eRam installed if anyone is
>interested to take a look and see what it does.
>
>
>Bernd
>
>At 04:04 PM 07/14/1999 -0400, you wrote:
>>My question is this. Wouldn't the e-ram when the vehicle is not at wot
>restrict
>>airflow? I've seen the pics on the web page and the fan blades are large
>and it
>>seens that it would restrict airflow. It seems you would start reducing the
>>airflow back towards the point of the stock air intake. It seems that the
>e-ram
>>would work better if it was a variable device that accelerated as the vehicle
>>accelerated. When the throttle body opens up more the e-ram speeds up
>therefore
>>pushing more air at the appropriate times, not just at wot. I like the
>idea and
>>have been very curious but was wondering about this. Not flaming or
>discounting
>>the idea just covering all of the bases.
>>
>>Jeff Durling
>>'96 RC Sport
>>
>>Bernd D. Ratsch wrote:
>>
>>> Since we've all been talking about RamAIR, Cool Air Systems, etc...here's
>>> something interesting for you all....
>>>
>>> Just let them know of the basic formula for ram air. It is little known and
>>> generally misunderstood.
>>>
>>> Max ram at 80 mph is .08psi. max ram at 180 mph is .4psi (thats point 4
>>> psi !!) This is with a 75% efficient inlet like on a dragster, that you
>>> would never have with your daily truck/car. (Try 25 to 50% , best
>>> case!!)
>>>
>>> You can't get around physics, everyone tries. Anyway, this is right out of
>>> Carroll Smith's "Tune to Win" racing book, as well as a basic known fact in
>>> aerodynamics. (kind of easy to calculate.)
>>>
>>> No matter what the shape of the inlet , (funnel, scoop, horn, etc) it
>>> doesn't matter, ram just does not exist for our cars.
>>>
>>> This is where the eRAM comes into play. It just takes unused electrical
>>energy
>>> in the battery, and creates a 200 mph ram air system (at WOT).
>>>
>>> Ps . here is the formula for ram potential:
>>> Air Density in lbs per cubic foot
>>> X Velocity in feet per sec squared divided by 288X32.2 (all times the
>>> efficiency factor)
>>>
>>> Group buy anyone??? ;)
>>>
>>> Bernd
>>
>
>
>
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