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| - | Hitachi DCG-306 V-spec carburetors starting with 1976 B210 California models employed an Altitude Compensator mechanism. So the car runs in tune both at sea level and at high elevations -- and everywhere in between. | + | Hitachi DCH-306 V-spec carburetors starting with 1976 B210 California models employ an Altitude Compensator mechanism. So the car runs in tune both at sea level and at high elevations -- and everywhere in between. |
| = Overview = | = Overview = | ||
| - | The Altitude Compensator is a totally automatic operation. It works by the bellows moving per altititude, exposing more or less air to the air bleeds inside the carburetor. | ||
| - | |||
| - | Diagram from the 1981 B310 [[Factory Service Manual]] | ||
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=23415 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23415.jpg] | ||
| - | |||
| Same castings with and without the holes drilled: | Same castings with and without the holes drilled: | ||
| <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=23416 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23416.jpg] | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=23416 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23416.jpg] | ||
| - | = Early = | + | == 1977 == |
| + | California (V) models use a carburetor with two fittings which lead to the air jets. A valve in the air cleaner connects to those via hoses. The valve is manually configurable to either H or L position. | ||
| + | |||
| + | Counties in USA 1,219m (4,000 ft) or more above sea high have been designated "High Altitude Counties" (see 1977 B210 Service Bulletin). | ||
| + | |||
| + | * At low altitudes: closed | ||
| + | * At high altitudes: open | ||
| + | |||
| Hitachi with 2-hose compensator. | Hitachi with 2-hose compensator. | ||
| [http://datsun1200.com/modules/myalbum/photo.php?lid=23417 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23417.jpg] | [http://datsun1200.com/modules/myalbum/photo.php?lid=23417 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23417.jpg] | ||
| - | = Late = | + | == 1981 == |
| + | 1981 use an Altitude Compensator with totally automatic operation. It works by a bellows moving per altitude, exposing more or less air to the air bleeds inside the carburetor. | ||
| + | |||
| + | Diagram from the 1981 B310 [[Factory Service Manual]] | ||
| + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=23415 http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23415.jpg] | ||
| + | |||
| Hitachi with vacuum secondary and 3-hose compensator. | Hitachi with vacuum secondary and 3-hose compensator. | ||
Revision as of 06:21, 14 July 2011
Hitachi DCH-306 V-spec carburetors starting with 1976 B210 California models employ an Altitude Compensator mechanism. So the car runs in tune both at sea level and at high elevations -- and everywhere in between.
Overview
Same castings with and without the holes drilled:
1977
California (V) models use a carburetor with two fittings which lead to the air jets. A valve in the air cleaner connects to those via hoses. The valve is manually configurable to either H or L position.
Counties in USA 1,219m (4,000 ft) or more above sea high have been designated "High Altitude Counties" (see 1977 B210 Service Bulletin).
- At low altitudes: closed
- At high altitudes: open
Hitachi with 2-hose compensator.
1981
1981 use an Altitude Compensator with totally automatic operation. It works by a bellows moving per altitude, exposing more or less air to the air bleeds inside the carburetor.
Diagram from the 1981 B310 Factory Service Manual
Hitachi with vacuum secondary and 3-hose compensator.
