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| See main article: [[Altitude_Compensator]] | See main article: [[Altitude_Compensator]] | ||
| - | == Vacuum Hoses == | + | = Vacuum Hoses = |
| - | === Vacuum Advance === | + | == Vacuum Advance == |
| Vacuum advance port is always the lowest of any ports on the carburetor. | Vacuum advance port is always the lowest of any ports on the carburetor. | ||
| Line 96: | Line 96: | ||
| Testing: Plug this port and raise RPMs to 1200. If the engine runs at fast idle better than before, the hoses or vaccum advance canister is leaking or connected incorrectly. | Testing: Plug this port and raise RPMs to 1200. If the engine runs at fast idle better than before, the hoses or vaccum advance canister is leaking or connected incorrectly. | ||
| - | You can drive the car with this plugged, but fuel economy and part-throttle power will be down slightly. | + | You can drive the car with this plugged, but fuel economy and part-throttle power will be down slightly. It may not be quite as smooth at part-throttle driving. |
| - | === EGR Signal Port === | + | == EGR Signal Port == |
| - | [[EGR]] | + | [[EGR]] port is above the the vaccum advance port. This signal gets stronger with more throttle - just the opposite of the vacuum advance signal. |
| - | === Choke Pull-Off === | + | Testing: Plug this port, and drive the car under varying temperatures and speeds. If the performance is markedly better, there is something wrong with the EGR system. |
| + | |||
| + | You can drive the car under all conditions with the EGR port plugged. Performance should be equal or better with it plugged. | ||
| + | |||
| + | == Choke Pull-Off == | ||
| This long black hose goes to the choke pull-off diaphragm. | This long black hose goes to the choke pull-off diaphragm. | ||
| <br>http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23417.jpg | <br>http://ddgonzal.members.winisp.net/getThumb.aspx?width=400&uri=http://datsun1200.com/uploads/photos/23417.jpg | ||
Revision as of 08:52, 13 January 2012
B210 used Hitachi DCH306 carburetor for 1978.
Contents |
Carburetor ID
The ID is inked (not stamped) on this boss on the carburetor:
Carburetor Adjustment
The 1978 carburetors are adjusted exactly the same as the original Datsun 1200 carburetor except for the idle speed RPM number.
After obtain the idle RPM spec, see the main article: Carburetor Adjustment.
North America
5-speeds are exclusive to the FU Engine model, with unique carburetors, jetting and support for maximum fuel economy.
All B210 use A14 engine.
ALL 1978 B210 Carburetor Type: DCH306 (H = Automatic Choke) Throttle Bores: 26/30 Primary/Secondary Venturis: 23/27 Float level: 19mm Float drop h: 1.3-1.5mm Choke: center mark Choke resistance: 3.7-8.9 @ 21C (70F) Ports: * EGR port * Vacuum advance port * Choke pull-off port
California
Manual Transmission: DCH306-11 Auto Transmission: DCH306-15
Main bleeds: 95/80 Slow jets: 45/50
DCH306-11 (M/T) Main jets: 105/145 Power jet: 40
DCH306-15 (A/T) Main jets: 104/145 Power jet: 48
Comments: M/T is much richer at full throttle, slightly leaner at cruising.
Canada
4-speed: same as USA 5-speed: same as USA Automatic: DCH306-12, jetted same as USA Automatic
USA
4-speed: DCH306-60 5-speed: DCH306-37 Automatic: DCH306-14
DCH306-60 (4-speed) Main jets: 104/145 Air bleeds: 110/80 Power jet: 48 Comments: Jetted Richer than CAL m/t
DCH306-37 (5-speed) Main jets: 107/145 Air bleeds: 65/60 Power jet: 48 Comments: Jetted Richer than 4-speed
DCH306-14/DCH306-12 (Auto transmission) Main jets: 104/145 Air bleeds: 95/80 Power jet: 40 Comments: Same as CAL auto except leaner full-throttle
Altitude Compensator
CAL models and all models sold in USA high altitude counties.
2 or 3 hose connectors near top of carburetor
For testing at low altitudes, remove the hoses and plug the ports coming out of the casting. The carburetor will run as normal.
See main article: Altitude_Compensator
Vacuum Hoses
Vacuum Advance
Vacuum advance port is always the lowest of any ports on the carburetor.
The Vacuum advance port is just above the mixture screw
Testing: Plug this port and raise RPMs to 1200. If the engine runs at fast idle better than before, the hoses or vaccum advance canister is leaking or connected incorrectly.
You can drive the car with this plugged, but fuel economy and part-throttle power will be down slightly. It may not be quite as smooth at part-throttle driving.
EGR Signal Port
EGR port is above the the vaccum advance port. This signal gets stronger with more throttle - just the opposite of the vacuum advance signal.
Testing: Plug this port, and drive the car under varying temperatures and speeds. If the performance is markedly better, there is something wrong with the EGR system.
You can drive the car under all conditions with the EGR port plugged. Performance should be equal or better with it plugged.
Choke Pull-Off
This long black hose goes to the choke pull-off diaphragm.
Testing: Pull the lower end of this hose off the carburetor, and plug the port. If the engine now idles better, either the hose is leaking or more likely the choke pull-off diaphragm is leaking. The latter is very common with 20-year old+ carburetors.
You can drive the car with this plugged, but after a cold start it will run very rich for some seconds until the choke warms up.