Don Dunbar wrote:

Hi again, I made a mistake with my calculation. Disregards the first posting.
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 =.000923m2.

The middle housing ports are 37x18 mm =.000596m2.

This is a total area of .003038m2.

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 =.001256mm2 and if you take the engine housing area we will have an decrease in
velosity
around 241%. The manifold area mid way has an area of .00595mm2.
The standard 13B throttle body has an area of .004770mm2. This seems to be an over kill for our use as it only has .001256mm2 coming in.

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

The bigger the pipe the lower the velocity and the lower the skin friction.
Take a look at a 250 HP diesel engine.

Paul Lamar
 
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