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| = Overview = | = Overview = | ||
| + | The Altitude Compensator is three types different years: | ||
| + | * Bellows | ||
| + | * sensor similar in looks to the A.T.C. and idle compensators | ||
| + | * manual switch | ||
| + | |||
| 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] | ||
| - | == 1977 == | + | == 1976 == |
| + | It uses a bellows. | ||
| + | |||
| + | [[FSM]] refers to it as an installable option: | ||
| + | * Drill hole in bottom of air cleaner, insert fitting | ||
| + | * Run hose over the to Bellows. Mount that on the side of the coil/electronics cover (on strut tower) | ||
| + | * Run two small hoses from Bellows to Carburetor | ||
| + | * Set idle speed and mixture | ||
| + | |||
| + | Hitachi with 2-hose compensator. | ||
| + | <br>[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] | ||
| + | |||
| + | == 1977-1978 == | ||
| 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. | 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. | ||
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| * At high altitudes: open | * At high altitudes: open | ||
| - | Hitachi with 2-hose compensator. | + | Remember to move the switch when you get to a legally-designated HAC -- and then readjust the mixture and idle speed. This is not an automatic system. |
| + | |||
| + | == 1979 == | ||
| + | Apparently 1979 models did not use a compensator. | ||
| + | |||
| + | == 1980 == | ||
| + | Bellows system like 1976 adopted. On above 600 m (1,978 ft). Non-adjustable. | ||
| - | [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] | + | == 1981-1982 == |
| + | 1981 used 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. | ||
| - | == 1981 == | + | * Operates above 500 m (1641 ft) |
| - | 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. | + | * Adds a third hose, for primary slow air bleed |
| + | ** 4-fitting bellows | ||
| + | ** 3-fittng carburetor | ||
| Diagram from the 1981 B310 [[Factory Service Manual]] | Diagram from the 1981 B310 [[Factory Service Manual]] | ||
Revision as of 06:54, 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.
Contents |
Overview
The Altitude Compensator is three types different years:
- Bellows
- sensor similar in looks to the A.T.C. and idle compensators
- manual switch
Same castings with and without the holes drilled:
1976
It uses a bellows.
FSM refers to it as an installable option:
- Drill hole in bottom of air cleaner, insert fitting
- Run hose over the to Bellows. Mount that on the side of the coil/electronics cover (on strut tower)
- Run two small hoses from Bellows to Carburetor
- Set idle speed and mixture
Hitachi with 2-hose compensator.
1977-1978
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
Remember to move the switch when you get to a legally-designated HAC -- and then readjust the mixture and idle speed. This is not an automatic system.
1979
Apparently 1979 models did not use a compensator.
1980
Bellows system like 1976 adopted. On above 600 m (1,978 ft). Non-adjustable.
1981-1982
1981 used 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.
- Operates above 500 m (1641 ft)
- Adds a third hose, for primary slow air bleed
- 4-fitting bellows
- 3-fittng carburetor
Diagram from the 1981 B310 Factory Service Manual
Hitachi with vacuum secondary and 3-hose compensator.
