Don Dunbar wrote:

Hi Paul and group,
I have been looking for a different throttle body from the standard series 5 13B type to reduced the weight and give more space under the
cowl.
Please excuse me for working in metric but i find it easier.
The end housing's have a retangle of 40x27 mm =.000596m2.
The middle housing ports are 37x18 mm =.000923m2.
This is a total area of .001519m2.

The standard 13B manifold mid way has large ports of 2x46mm and 2x38mm diameter.

The standard turbo charger has an outlet of 40 mm dia =.001256 and if you take the engine housing area we will have an increase in volosity
around 36%. The manifold area mid way has an area of .00595.

The standard 13B throttle body has an area of .004770mm2. This seems to be an over kill for our use.
The seperate ports with different timing is good for flexablity for road use but not essensial for an aircraft.

I have a 60mm dia throttle body with .002827mm2 area that I am looking use as the standard 3 throat body is large and doesn't fit very well.
Does Mazda have some reason for the changes is size for the turbo engine manifold.
Regards Don

Forget runner velocity. Bigger is better. Aircraft engines run at wide open
throttle most of the time as most people cruise over 8000 feet.
The bigger the ports and intake runner the more power the engine
will generate. The ports and runners have been getting bigger with
each generation of the engine. So too the HP. The RX8 engine has 
ports almost 20% larger than the 3rd gen turbo engine.
 
Paul Lamar
 
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