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| [[A12|A12T]] is the twin carb engine fitted to Datsun Sunny [[B210]] and Nissan Cherry PE10. It uses the [[Hitachi Twin Carb]] system, dual 38mm Hitachi sidedrafts. These mainly differ from the [[A12GX Engine]] Hitachis in that they are have a new idle speed and idle mixture system. They can be easily distinguished by their flat tops. | [[A12|A12T]] is the twin carb engine fitted to Datsun Sunny [[B210]] and Nissan Cherry PE10. It uses the [[Hitachi Twin Carb]] system, dual 38mm Hitachi sidedrafts. These mainly differ from the [[A12GX Engine]] Hitachis in that they are have a new idle speed and idle mixture system. They can be easily distinguished by their flat tops. | ||
| - | |||
| - | Also see: | ||
| - | * [[A12T_Engine_Photo_Index|A12T Photos]] | ||
| - | * [[A12T Carburetor Part Numbers]] | ||
| = Overview = | = Overview = | ||
| [[JDM]] 1973-1975 B210 GX models had either an A12S (single-carb) or optional A12T (twin-carb) engine. While the A12T is very similar to the A12 GX Engine, it used different flattop Hitachis and a slightly different intake manifold with a few more fittings. These are good carburetors that are not jetted leaner, but instead have a closed fuel bowl vent system. They are almost identical to the dome-top carburetors except for the IMS fittings on the top of the carbs. They total system (inlet manifold and hoses) is more complicated to allow idle mixture and speed adjustments and capture all the gasoline fumes into the air cleaner. | [[JDM]] 1973-1975 B210 GX models had either an A12S (single-carb) or optional A12T (twin-carb) engine. While the A12T is very similar to the A12 GX Engine, it used different flattop Hitachis and a slightly different intake manifold with a few more fittings. These are good carburetors that are not jetted leaner, but instead have a closed fuel bowl vent system. They are almost identical to the dome-top carburetors except for the IMS fittings on the top of the carbs. They total system (inlet manifold and hoses) is more complicated to allow idle mixture and speed adjustments and capture all the gasoline fumes into the air cleaner. | ||
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=776 http://datsun1200.com/modules/myalbum/photos/776.jpg] | + | [http://datsun1200.com/modules/myalbum/photo.php?lid=776 http://datsun1200.com/uploads/photos/776.jpg] |
| JDM Datsun Cherry (E10) models also used the A12T engine, including the famous Cherry X1-R vehicle. | JDM Datsun Cherry (E10) models also used the A12T engine, including the famous Cherry X1-R vehicle. | ||
| - | Datsun Competition ([[Nissan Competition]]) sold a open-vented system: | + | == Competition Flat-Tops = |
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=7554 http://datsun1200.com/modules/myalbum/photos/thumbs/7554.jpg] | + | NOTE: Competition versions of flat-tops do not have IMS. |
| + | They are simply the old style carbs with the new tops. | ||
| + | |||
| + | Datsun Competition ([[Nissan Competition]]) sold a open-vented, non-IMS, system: | ||
| + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=7554 http://datsun1200.com/uploads/thumbs/7554.jpg] | ||
| <br>Supplied with simple vent tubes. Production A12T vents the carburetors to the air cleaner. | <br>Supplied with simple vent tubes. Production A12T vents the carburetors to the air cleaner. | ||
| = Idle Mixture System = | = Idle Mixture System = | ||
| - | Ummm... smells good, and works good too. | + | Ummm... smells good, and works good too. JDM non-competition (stock) Hitachi sidedraft flat-top carburetors come with an advanced Idle Mixture System (IMS), for fine tuning of the idle mixture. |
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=1132 http://datsun1200.com/modules/myalbum/photos/1132.jpg] | + | [http://datsun1200.com/modules/myalbum/photo.php?lid=1132 Thick hoses]: Idle Mixture System (IMS) |
| - | <br>Thick hoses: Idle Mixture System (IMS) | + | <br><img size=400>http://datsun1200.com/uploads/photos/1132.jpg</img> |
| - | IMS body with Mixture Screw | + | [http://datsun1200.com/modules/myalbum/photo.php?lid=23191 Idle Mixture System] |
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=21385 http://datsun1200.com/modules/myalbum/photos/thumbs/21385.jpg] | + | <br><img size=400>http://datsun1200.com/uploads/photos/23191.jpg</img> |
| - | = Adjustments = | + | [http://datsun1200.com/modules/myalbum/photo.php?lid=21385 IMS body] with Mixture Screw |
| + | <br><img size=400>http://datsun1200.com/uploads/photos/21385.jpg</img> | ||
| + | |||
| + | == Adjustments == | ||
| Idle mixture (IMS) is possible with the new flat-top Hitachi design. | Idle mixture (IMS) is possible with the new flat-top Hitachi design. | ||
| - | + | [http://datsun1200.com/modules/myalbum/photo.php?lid=21386 Green]: Hoses to air cleaner (including the curved IMS hose) | |
| - | Green: Hoses to air cleaner (including the curved IMS hose) | + | <br><img size=400>http://datsun1200.com/uploads/photos/21386.jpg</img> |
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=21386 http://datsun1200.com/modules/myalbum/photos/thumbs/21386.jpg] | + | |
| <br>Blue: Fuel lines to fuel bowls | <br>Blue: Fuel lines to fuel bowls | ||
| <br>Red: Idle speed system (air bypass system), connects to IMS body vents | <br>Red: Idle speed system (air bypass system), connects to IMS body vents | ||
| Blue: Fuel bowl vent lines | Blue: Fuel bowl vent lines | ||
| - | <br>Green: IMS inner vent line (to Air Cleaner) | + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=21387 Green]: IMS inner vent line (to Air Cleaner) |
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=21387 http://datsun1200.com/modules/myalbum/photos/thumbs/21387.jpg] | + | <br><img size=400>http://datsun1200.com/uploads/photos/21387.jpg</img> |
| <br>Red: IMS (Idle Mixture) | <br>Red: IMS (Idle Mixture) | ||
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=23191 http://datsun1200.com/modules/myalbum/photos/thumbs/23191.jpg] | + | {{Hitachi Twin Carb Navbox}} |
| - | + | ||
| [[Category:Hitachi Twin Carb]] | [[Category:Hitachi Twin Carb]] | ||
Revision as of 07:19, 9 January 2013
A12T is the twin carb engine fitted to Datsun Sunny B210 and Nissan Cherry PE10. It uses the Hitachi Twin Carb system, dual 38mm Hitachi sidedrafts. These mainly differ from the A12GX Engine Hitachis in that they are have a new idle speed and idle mixture system. They can be easily distinguished by their flat tops.
Contents |
Overview
JDM 1973-1975 B210 GX models had either an A12S (single-carb) or optional A12T (twin-carb) engine. While the A12T is very similar to the A12 GX Engine, it used different flattop Hitachis and a slightly different intake manifold with a few more fittings. These are good carburetors that are not jetted leaner, but instead have a closed fuel bowl vent system. They are almost identical to the dome-top carburetors except for the IMS fittings on the top of the carbs. They total system (inlet manifold and hoses) is more complicated to allow idle mixture and speed adjustments and capture all the gasoline fumes into the air cleaner.
JDM Datsun Cherry (E10) models also used the A12T engine, including the famous Cherry X1-R vehicle.
= Competition Flat-Tops
NOTE: Competition versions of flat-tops do not have IMS. They are simply the old style carbs with the new tops.
Datsun Competition (Nissan Competition) sold a open-vented, non-IMS, system:
Supplied with simple vent tubes. Production A12T vents the carburetors to the air cleaner.
Idle Mixture System
Ummm... smells good, and works good too. JDM non-competition (stock) Hitachi sidedraft flat-top carburetors come with an advanced Idle Mixture System (IMS), for fine tuning of the idle mixture.
Thick hoses: Idle Mixture System (IMS)
IMS body with Mixture Screw
Adjustments
Idle mixture (IMS) is possible with the new flat-top Hitachi design.
Green: Hoses to air cleaner (including the curved IMS hose)
Blue: Fuel lines to fuel bowls
Red: Idle speed system (air bypass system), connects to IMS body vents
Blue: Fuel bowl vent lines
Green: IMS inner vent line (to Air Cleaner)
Red: IMS (Idle Mixture)
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