Ok,
Cooler air, sure that does work. Ask anyone when their runnin in the
fall at about 40 degrees.
As far as it not being possible for street cars and or trucks. Ill
just ignore my windtunnel experiences and everything that I've seen and
created in them. So, when you take the little shield off of the
radiator support on the older style daks, you know, where the air tube
is ran. That hp gain is due to cooler air? Why do Mopar and
aftermarket intake companies sell intake tubes that are smooth instead
of ridged like O.E.? It's due to airflow in the tunnel, not air
pooling. just my .02 and no aggrivation given or taken! =0)
Eric
"Bernd D. Ratsch" wrote:
>
> Eric,
>
> I'm not trying to aggravate anyone, let alone confuse anyone at that...
>
> Max "Ram" at 80 mph is .08psi. Max "Ram" at 180 mph is .4psi (that's point
> 4 psi. This is with a 75% efficient inlet like on a dragster, that you
> would never have with our trucks (or any street vehicle). It's closer to
> 25% to 50% , best case!!
>
> You cant 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 Air just does not
> exist for our cars.
>
> 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).
>
> It WILL, however, give you a cooler air charge which will help out any
> engine..performance wise.
>
> -----Original Message-----
> Subject: Re: DML: Curiousity about hoods
>
> Bernd,
> Im not to sure I agree with that. If you have a vacuum thats doin
> what it does! And you have air rushing into it instead of it sucking it
> isnt that Functionally "ram air"? Crude I know! With my hood and the
> amount of space that air can collect in it, I believe its sooner than
> 80. Much sooner actually. At idle to about 25mph to 30mph it is not
> "Ram Air". It's more like air assisted! Beyond 45 to 50mph is when it
> begins to truelly be "ram air". But by the time you're 3/4 down the
> track, its honestly functioning quite nicely. I personally can tell a
> huge difference when I put the fiberglass hood on as aposed to my metal
> buck. I believe the reason is a 50% hood gain, and the other 50% due to
> the intake exhaust combination that was enhanced by the hood. It goes
> back to the combination modifications. The more that match the happier
> the ponies will be! Air scoops that are high above or closer to the
> front of the vehicle are the most functional just due to aerodynamics.
> Cowls are excellent to due to pressure zones.
> I dont know really, Im just babeling and got carried away!
> Oh, I went down to the exhaust lab and talked to a guy about Cats. Stock
> Cats are no where near "hi-flow" Cats. With most name brand exhaust,
> their claims are pretty accurate as being whatever % better.
> Eric
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:17:06 EDT