I made this set of funnels for kitchen or garage use. The funnels are threaded for optimal fluid flow and have a large body for high flow rates. 
The small funnel has the following dimensions:
Small end: 11mm inside diameter, 14mm outside diameter
Large end: 72mm outside diameter, 62mm inside diameter
Height: 84mm
Volume: 62.5 cm^3
Volumetric flow rate (water): 3 L/min

The large funnel has the following dimensions:
Small end: 20mm inside diameter, 24mm outside diameter
Large end: 120mm outside diameter, 100mm inside diameter
Height: 135mm
Volume: 261.8 cm^3
Volumetric flow rate (water): 13 L/min

Feel free to comment with any suggested changes or modifications.