Suction Diesel Injection

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Suction Diesel Injection (SDI)[1] is a design of naturally aspirated diesel engine developed and produced by the Volkswagen Group for use in cars, vans, sailboats and a variety of industrial applications. These engines are produced in various sizes (from 1.7 to 2.5 litres) and states of tune, depending on application.

The SDI engine is used in applications where reliability and fuel economy are of primary concern. Because these engines lack any form of forced induction, their power output is low compared to a similar turbocharged engine. For example, the 2.0 SDI engine fitted to the Volkswagen Golf Mk5 has a peak power output of 74 bhp; whereas the same engine in turbocharged TDI form is rated at 138 or 168 bhp (125 kW/170 PS), depending on specification. However, performance at very low engine speeds and when setting off from stationary is often superior to forced induction engines due to the lack of turbo lag.[2]

The 1.9 SDI engine, fitted to the first generation Škoda Octavia, is particularly popular amongst taxi drivers due to its low fuel consumption and ability to cover large mileages (250,000+ miles) without requiring major mechanical attention.[2]

Contents

[edit] Table of SDI engines and applications

[3][4][5]

Engine Code(s) Size (litres) Quoted peak power (Pferdestärke) Torque Notable design features Application(s)
AHB, AHG, AKU, AKW 1.7 44 kW (59 hp) 115 N·m (85 ft·lbf) Volkswagen Lupo, Volkswagen Polo (some markets)
ASY, AEY 1.9 47 kW (63 hp) 125 N·m (92 ft·lbf) Volkswagen Polo (Mk6), Volkswagen Golf (Mk3), Volkswagen Caddy types 9U/9K, SEAT Inca, Skoda Octavia (Mk1), Skoda Fabia, Volkswagen Bora (some markets)
AGP, AQM 1.9 50 kW (67 hp) 133 N·m (98 ft·lbf) Volkswagen Polo (Mk6), Volkswagen Golf (Mk4), Volkswagen Caddy types 9U/9K, SEAT Inca, Skoda Octavia (Mk1) Volkswagen Bora (some markets)
BDJ, BST 2.0 51 kW (68 hp) 140 N·m (103 ft·lbf) Pumpe Düse technology Volkswagen Caddy type 2K
BDK 2.0 55 kW (74 hp) 140 N·m (103 ft·lbf) Pumpe Düse technology Volkswagen Golf Mk5
AGX 2.5 55 kW (74 hp) 160 N·m (118 ft·lbf) Straight 5 engine configuration LT28 and LT35 vans
40-4, 50-4, 60-4 1.9 29 kW (39 hp)/37 kW (50 hp)/40 kW (54 hp) Optional connection for heater core or hot water preparation Sailboats
55-5, 75-5 2.5 40 kW (54 hp)/55 kW (74 hp) Yachts

[edit] References

  1. ^ SDi Meaning
  2. ^ a b The SDI 1.9 Industrial Engine
  3. ^ ALEX ORIGINAL LTD. - Products
  4. ^ http://www.gates.com/europe/file_save_common.cfm?thispath=Europe%2Fdocuments_module&file=TB_020_addendum.pdf
  5. ^ Volkswagen Marine > Engines <

[edit] See also

[edit] External links

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