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Technical => Engine Tech => Topic started by: dominator on April 24, 2005, 03:32:38 PM

Title: 70mm Throttlebody cfm?
Post by: dominator on April 24, 2005, 03:32:38 PM
Just curious, anybody know what kind of cfm a 70mm TB flows?
Searched the net and couldn't find much ifo on 60mm,65mm or 70mm cfm#s.
Title: Re: 70mm Throttlebody cfm?
Post by: V8Demon on April 24, 2005, 04:43:14 PM
http://www.accufabracing.com/Flow%20Data.htm

They don't have a listing for the stock 60 MM throttle body, but it flows around 550 at 28" barometric pressure
Title: Re: 70mm Throttlebody cfm?
Post by: dominator on April 24, 2005, 05:44:21 PM
Cool,the only problem is,what would be my approx baro and were would i find it?
Is it not 14.8 at sealevel?
Title: Re: 70mm Throttlebody cfm?
Post by: V8Demon on April 25, 2005, 11:29:51 AM
14.8 is pressure at sea level otherwise known as 1 BAR.

The way it's measured in the chart is by inches of mercury.....

Quote
Weather forecasters measure air pressure with a barometer. Barometers are used to measure the current air pressure at a particular location in "inches of mercury" or in "millibars" (mb). A measurement of 29.92 inches of mercury is equivalent to 1013.25 millibars.
Barometer
An instrument used by weather forecasters and scientists to measure air pressure at any given moment for a particular place. A standard mercury barometer has a glass column about 30 inches long, closed at one end, with a mercury-filled reservoir. Air pressure is usually measured in millibars or in inches of mercury. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure forces the mercury higher in the olumn. Low pressure allows the mercury to drop to a lower level in the column. An aneroid barometer uses a small, flexible metal box called an aneroid cell. The box is tightly sealed after some of the air is removed, so that small changes in external air pressure cause the cell to expand or contract.
Title: Re: 70mm Throttlebody cfm?
Post by: Cougar5.0 on April 25, 2005, 11:37:12 AM
Quote from: dominator
Cool,the only problem is,what would be my approx baro and were would i find it?
Is it not 14.8 at sealevel?


Well, 28 in H2O (that's what they are using) is about 1 psi drop across the TB. It is standard to use 25-28 in H2O to compare flow rates - so I would use those figures.
Title: Re: 70mm Throttlebody cfm?
Post by: V8Demon on April 25, 2005, 11:46:40 AM
AHHH I thought they measuring air pressure.  My mistake.
Title: Re: 70mm Throttlebody cfm?
Post by: dominator on April 25, 2005, 08:59:29 PM
Cool,so about 650-700cfm?
Title: Re: 70mm Throttlebody cfm?
Post by: TurboCoupe50 on April 26, 2005, 08:15:06 AM
On Accufabs page... Anyone notice????

STOCK 58 & 60mm, test results not available..

Accufab 65mm RACE, test results not available...

I believe they don't want you to know what they are... But they slipped up..

Accufab 65mm, 664cfm @ 28"... (and at the bottom of the page)Stock Explorer 65mm 680cfm @ 28". So their aftermarket 65mm is not as good as the stock Ford piece???
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