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| = Overview = | = Overview = | ||
| The Altitude Compensator is three types different years: | The Altitude Compensator is three types different years: | ||
| - | * Bellows | + | * Bellows + hose from air cleaner |
| - | * sensor similar in looks to the A.T.C. and idle compensators | + | * manual switch - similar in looks to the A.T.C. |
| - | * manual switch | + | |
| Same castings with and without the holes drilled: | Same castings with and without the holes drilled: | ||
| Line 11: | Line 10: | ||
| == 1976 == | == 1976 == | ||
| - | It uses a bellows. | + | It uses a bellows, fitted to the body side. Hose runs from air cleaner to bellows. Then two hoses run to carburetor air bleeds. It is totally automatic. |
| - | [[FSM]] refers to it as an installable option: | + | 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] | ||
| + | |||
| + | == 1976 == | ||
| + | B210 comes with carburetor fittings plugged. [[FSM]] refers to it as an installable option: | ||
| * Drill hole in bottom of air cleaner, insert fitting | * 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 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 | + | * Run two small hoses from Bellows to Carburetor (remove the plugs) |
| * Set idle speed and mixture | * 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 == | == 1977-1978 == | ||
Revision as of 07:16, 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 + hose from air cleaner
- manual switch - similar in looks to the A.T.C.
Same castings with and without the holes drilled:
1976
It uses a bellows, fitted to the body side. Hose runs from air cleaner to bellows. Then two hoses run to carburetor air bleeds. It is totally automatic.
Hitachi with 2-hose compensator.
1976
B210 comes with carburetor fittings plugged. 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 (remove the plugs)
- Set idle speed and mixture
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.
