Mass air meter effective bore diameter

[tim281]

I was looking at the 94/95 5.0 mass air meters and they do have a larger 70mm diameter than 55mm fox meters, but there is a large fin down the center of the bore. I would think from a fluild dynamics standpoint that your maximum cfm is compromised since the maximum flow velocity should be a the center of the diameter.
When compared to say a C&L 73 or 76mm bore mass air, the 94/95 mass air would be much more restrictive.
Maybe the 94/95 mass air with the fin doesn't have any limitations to a certain cfm or horsepower rating?
It would be interesting to see a flow diagrahm comparing all these meters to see where they drop off with respect to each other.

I was thinking of doing the 94/95 upgrade cause it was cheap, but I do know that I will be going to 24# pound injectors sometime in the future so maybe a C&L is the best fit because I could use it now and then change out the calibration tube later. I know the Pro-M meters are probably better, the C&L is pretty handy with its calibration tube adjustement.

Another thing, why does C&L produce a 73mm and 76mm mass air? seems like the 73mm was the old design and the 76mm is the new design....why buy a 73 when you can have a 76?

 

[HISSIN50]

You made a salient point. The F2 meter, even with the center post, still flows more than enough for 19's. Remember, it was also deemed adequate for Cobras with 24's.

 

[Maryland Stang]

Do not modify the meter housing to flow more air. The sensor is setup so it will send a specific signal to the computer given a certain amount of air going through the housing. If you increase the air flow through the housing the computer will only be able to tell there is an increase from the O2 sensors. They will show a lean condition since the computer didn't know there was more air flowing to it.

It's kinda like putting the cart before the horse. The computer is reacting to increased air flow instead of adding fuel beforehand since it already knows there's an increased airflow.

 

[tim281]

Yeah, I know the mass air meter is called a "meter" for a reason since it actually measures the volume of air input to the engine. Any tampering with the meter will just mess up your metering amount.
I was just thinking from a pumping loss perspective, the least restriction is the best. However, it maybe that the CFM where the 94/95 mass air starts to add resistance it at higher CFM's than we should worry about for a N.A. street 302. Sounds like it easily takes care of the 19# injectors, but I was just wondering about mild H/I/C.