[Land-speed] cold air supply question

drmayf drmayf at mayfco.com
Mon May 25 22:47:55 MDT 2009


Dave, depends on where the inlet is. If for instance it was in a 
headlight bucket receptacle (ie remove the headlight and put a bell 
inlet there) that was already a high pressure point then there would be 
no drag increase  but would have some pressure assist. And with a proper 
designed ductwork at the termionation  slow the air down for presssure 
recovery as well..  The inlet could be anywhere where there is alrady a 
high dynamic pressure... But if you stick a big old scoop up in the air 
then you gonna spill air and it will increase drag...

Anyway, trundling off to bed... what's happening in your neck of the 
woods? Oh, watched an antique roadshow program from Ct this evening. Had 
some old Pub signs that were worth in the hundreds of thousands of 
dollars... get huntin"



mayf
Dave Dahlgren wrote:

> Cold air gains 1% for every 7 degrees F more ore less drag for inlet 
> is V^3 how fast do you go and where do you think the trades are ? here 
> is a hint if you get colder air with an inlet that is just big enough 
> that the engine uses all the air and basically sucks a hole in the air 
> where the scoop is it could be a winner if it builds static pressure 
> it is drag..
> dave
> ----- Original Message ----- From: "David in Durango" <adin at frontier.net>
> To: "LandSpeed list" <land-speed at autox.team.net>
> Sent: Monday, May 25, 2009 3:03 PM
> Subject: [Land-speed] cold air supply question
>
>
>> We want to supply cold air to a motor.  Is HP or displacement the 
>> determining
>> factor in "how big a pipe do we need so the motor doesn't starve for 
>> air?"
>>
>> A carb is what? 4" or less of flow at wot?
>>
>> I am supposing the length of pipe would matter at some point . . . at 
>> what
>> length?
>>
>> Thanks for playing . . .
>>
>> David
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