[TR] Engineer type question

[triosan at gmail.com]

Race TR6. Pusher fan covering half the Wizzard rad. Too cold at race
speed had to put the 185 degree thermostat back in. Only turn on fan if I
have to idle or follow a double yellow parade for a while. 

Sent from my Sprint phone.

------ Original message------

From: Jeff

Date: Sun, 4/6/2014 12:39 PM

To: triumphs at autox.team.net;

Subject:Re: [TR] Engineer type question

On 4/6/2014 3:14 PM, terryrs at comcast.net wrote:
> A pusher fan mounts in front of the radiator.  On the one hand, it adds airflow at idle.  On the other hand, it restricts airflow by blocking the radiator at speed.
>
> So...question.  What is the difference in airflow for a pusher fan at 1360 CFM, compared to airflow reaching the radiator (properly shrouded) at 70 mph?  Would 1360 CFM be a net gain or net loss?

70 MPH is just a tick over 100 feet per second.  So, that's 6000 feet 
per minute, times the effective area of the radiator.  Even if it's just 
one square foot, you have a potential 6000 CFM available.  Other things 
come into play at those speeds, though, but it seems safe to say that 
there's sufficient air flow available...

Jeff Scarbrough
Corrosion Acres, Ga.

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