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		Engines for Biogas (GTZ, 1988, 133 p.)
			(introduction...)
			Copyright
			Preface
			1. Scope of this publication
			2. Review of existing literature
			3. Essential theory on internal combustion engines
			4. Biogas and its Properties as a Fuel for Internal Combustion Engines
			5. The Gas Diesel Engine
			6. The Gas Otto Engine
			7. Planning a biogas engine system
			8. Utilization of the engine's ''Waste'' heat
			9. Biogas for vehicles
			10. Overview of Commercially Available Systems
			Literature
			Appendix I
			Appendix II
			Appendix III
			Appendix IV
			Appendix V

Appendix IV

Design Drawings of a Venturi Mixer for Self-Manufacture (Example)

Fig. 1: Venturi mixer parts 1 Mixer body (tube), 2 Bore for venturi ring holder bolt, 3 Bore for butterfly valve shaft, 4 Bore for gas supply pipe connection (brazed, welded), 5 Venturi ring, 6 Calibrated bores for gas inlet, 7 Gas supply ring channel, 8 Groove for seal ring (O-ring), 9 Bore for venturi ring holder bolt; all dimensions according to calculations and engine inlet size (refer to Chapter 6).

Fig. 2: Venturi mixer parts, continued. 10 Connection flange, 11 Bore for connection bolts to engine and air filter, 12 Bore for connection of mixer body (brazed, welded), 13 Wing nut for fixing the butterfly valve shaft, 14 Washer, 15 Rubber/plastic seal ring, 16 Butterfly valve, 17 Washer fixed to butterfly valve shaft, 18 Butterfly valve shaft cum control lever, 19 Small bolts for fixing butterfly to shaft.

Fig. 3: Venturi mixer assembly

20 Venturi seal ring (0-ring), 21 Venturi holder bolt and nut, 22 Gas inlet valve, 23 Gas supply pipe