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| - | Nissan A.I.S. (Air Injection System) with air pump system -- a.k.a. "smog pump" -- was first fitted to some 1960s Datsuns. The first B-series models to have an Air Pump was the North American [[B210]] series for 1975. No Datsun 1200 was fitted with an air pump. | + | Nissan A.I.S. (Air Injection System) with air pump system -- a.k.a. "smog pump" -- was first fitted to some 1960s Datsuns. The first B-series models to have an Air Pump was the North American [[B210]] series for 1975. |
| + | |||
| + | NOTE: No Datsun 1200 was fitted with an air pump. | ||
| = Overview = | = Overview = | ||
| - | An engine driven pump, about the size of the alternator forces air into the exhaust passages. | + | An engine driven pump, about the size of the alternator, forces air into the exhaust passages. This allows any unburnt gasoline to burn up in the exhaust system, thus reducing pollution. |
| - | [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Emissions/EC-08_2.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Emissions/th_EC-08_2.jpg] | + | <img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Emissions/EC-08_2.jpg</img> [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Emissions/EC-08_2.jpg full] |
| Components: | Components: | ||
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| * Air pump air cleaner. This is large disk mounted down by the [[Charcoal Canister]] | * Air pump air cleaner. This is large disk mounted down by the [[Charcoal Canister]] | ||
| * Check valve before going into head. Prevents exhaust from backflowing into pump or air filter | * Check valve before going into head. Prevents exhaust from backflowing into pump or air filter | ||
| - | * A.B. Valve (anti-backfire valve) between carburetor Air Cleaner and intake port (port on intake manifold). This valve has a single vacuum hose to control it. It prevents backfires in the exhaust system when during acceleration the richer naturally becomes richer, a condition the [[Throttle Opener]] also works on. However unlike the throttle opener, it dumps air into directly the intake manifold, causing it to lean out. This only occurs during decceleration so does not lean out the mixture when accelerating or cruising. | + | * A.B. Valve (anti-backfire valve) between Air Cleaner and intake port (port on intake manifold). This valve has a single vacuum hose to control it. It prevents backfires in the exhaust system when during acceleration the richer naturally becomes richer, a condition the [[Throttle Opener]] also works on. However unlike the throttle opener, it dumps air into directly the intake manifold, causing it to lean out. This only occurs during decceleration so does not lean out the mixture when accelerating or cruising. |
| California models had these additions to prevent overheating of catalytic convertor: | California models had these additions to prevent overheating of catalytic convertor: | ||
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| or (later models): | or (later models): | ||
| * C.A.C. valve. One hose tees into the pump output, the other hose dumps to the air (apparently not connected to anything). This valve has a single vacuum hose to control it | * C.A.C. valve. One hose tees into the pump output, the other hose dumps to the air (apparently not connected to anything). This valve has a single vacuum hose to control it | ||
| + | |||
| + | = Layout = | ||
| + | |||
| + | 1976 B210 USA Federal 4-speed. WIDE bracket contains tensioner and supports the pump | ||
| + | <br><img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/air_pump_1976.jpg</img> [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/air_pump_1976.jpg full] | ||
| + | |||
| + | 1979 B310 USA Federal 4-speed. NARROW bracket contains tensioner and supports the pump | ||
| + | <br><img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/air_pump_1979.jpg</img> [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/air_pump_1979.jpg full] | ||
| + | |||
| + | [[Crankshaft#Pulley]]. Outer groove is for the air pump V-belt | ||
| + | <br><img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/crank_pulley.jpg</img> [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/crank_pulley.jpg full] | ||
| + | |||
| + | |||
| [[Category:Emission Control And Tune-Up]] | [[Category:Emission Control And Tune-Up]] | ||
| [[Category:Fuel System]] | [[Category:Fuel System]] | ||
Revision as of 08:36, 17 February 2015
Nissan A.I.S. (Air Injection System) with air pump system -- a.k.a. "smog pump" -- was first fitted to some 1960s Datsuns. The first B-series models to have an Air Pump was the North American B210 series for 1975.
NOTE: No Datsun 1200 was fitted with an air pump.
Overview
An engine driven pump, about the size of the alternator, forces air into the exhaust passages. This allows any unburnt gasoline to burn up in the exhaust system, thus reducing pollution.
Components:
- Air pump
- Air pump air cleaner. This is large disk mounted down by the Charcoal Canister
- Check valve before going into head. Prevents exhaust from backflowing into pump or air filter
- A.B. Valve (anti-backfire valve) between Air Cleaner and intake port (port on intake manifold). This valve has a single vacuum hose to control it. It prevents backfires in the exhaust system when during acceleration the richer naturally becomes richer, a condition the Throttle Opener also works on. However unlike the throttle opener, it dumps air into directly the intake manifold, causing it to lean out. This only occurs during decceleration so does not lean out the mixture when accelerating or cruising.
California models had these additions to prevent overheating of catalytic convertor:
- Air control valve
- E.A.R.V. (Emergency air relief valve)
or (later models):
- C.A.C. valve. One hose tees into the pump output, the other hose dumps to the air (apparently not connected to anything). This valve has a single vacuum hose to control it
Layout
1976 B210 USA Federal 4-speed. WIDE bracket contains tensioner and supports the pump
full
1979 B310 USA Federal 4-speed. NARROW bracket contains tensioner and supports the pump
full
Crankshaft#Pulley. Outer groove is for the air pump V-belt
full