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The Hitachi DCH340 series carburetor is larger than the stock Datsun 1200 Hitachi DCH306 carburetor, yet runs smoother and makes more power than a Weber 32/36 Carburetor. They came as standard equipment on mid-to-late 1970s Datsun L-series engine, and Jet Kits for the A12 engine were available. It was first used on 1973 L16 and L18, and on all the L20Bs that followed.
Contents |
Overview
- Technical article comparing to Weber DGV and Hitachi DAF328 (L16) carburetors
- old articleᴬᴿᶜᴴᴵⱽᴱ
- DCH340 parts diagram
- Tercel Swap DCH340
- "The car has never run better, pulls strong (even with the AC on)"
Most 510s used a Nikki carburetor. But the last North American 510s used Hitachi DCH340, the 1973 model. Most 1973-1980 L-series L18 & L20B used them, like 1978-1981 510, 1977-1979 200SX and pickups.
1980 USA version photos
1980 720 Pickup with L20B
1977-1978 620 Pickup with L20B
Jet Kit for A12 engine
DCH340 retrofitted to A14 Engine
parts breakdown
Air Horn & air horn Gasket
Airflow
Venturis - total area Weber 32/36: 26/27 - 1103 DCH340 L18 : 23/30 - 1122 DCH340 L20B: 24/31 - 1208
Jetting
1974 L18 DATSUN 620 TRUCK NORTH AMERICA venturis: 23/30 Main jets: 100/170 Air bleeds: 60/60 Slow jets: 45/90 Slow bleeds: 145/100 Slow economizer: 1.8 mm Power jet: 41 Float level: 23mm A12 CENTRAL TUNING KIT venturis: unknown Main jets: 115 or 117/155 Air bleeds: 60/60 Slow jets: 45/90 Slow bleeds: 140 or 150/100 Slow economizer: 180 Power jet: 48 ?: 120
Hitachi Carb Lineage
Hitachi DCx Series
- better venturis than the DAF series it replaced
- vacuum operated secondaries
- Used on Datsuns and 1973-1976 Honda Civic 1200/1250
Models
- DCG286: 28 mm secondary bore - Datsun 1000, A10 engine
- DCA306: 1967-1969 520/521 with J13 engine (large bolt spacing)
- DCG306: 30 mm secondary bore - Datsun 1200, A12 engine, manual choke. Honda Civic.
- DCH306: 30 mm secondary bore - Datsun 1200, A12 engine, auto choke. Also used by A13, A14, A15
- DCR306: 1981-1982 A15, E15, E16
- DCH340: 34 mm secondary bore - Datsun 510, 610, 710, 620, 720. L16, L18
- DCH340 with high-speed enrichment system - L20B engine. Isuzu Chevrolet LUV
- DCR360: 1980 L20B, Z20
- DCR342: 1981 L20B, Z20 California, 1982 CA20 Stanza
- DCH342: 1981 L20B, Z20 non-California
- DCH328: 32 mm secondary bore -
- DCR384: 1983-1986 Z24 engine
DFx Series
- DFP306: 1981-1983 MPG Pulsur, MPG Sentra E15, E16
- Also Geo 1985-1986 M/T 1.0 liter
- DFC328: 1983 Pulsur, Sentra E15, E16
- DCZ328: 1983 Pulsur, Sentra E15, E16
- DFE2832: 1984-1985 Pulsur, Sentra E15, E16
- DFP384: 1983-1986 Z24 engine
Hitachi DAF series - Solex-style primary venturi
- DAF328 - Most L16
- Ford Courier
- Also 1987-1988 Ford Ranger 2.0 (Mazda engine)