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Modify your Stock 2BBL Hitachi Carburetor (ea81)
Written by TheSubaruJunkie Subaru4WD.net
I've done this modification to my carburetor with great results in acceleration and highway speed's. This modification may impact emissions results so if you need to pass emission tests in the future you might want to get a spare carburetor from the Junk Yard to perform this operation on. NOTE: This modification will only work on the EA81 series Hitachi's. Although the same modification is possible for the EA82 Hitachi's, I have not performed it, or do I have images available for the modification. Just a little background about this modification and the reason why I did this. The Hitachi carburetor has 2 barrels, but only the primary barrel will open under acceleration. It is not until the gas peddle is fully depressed and a certain amount of vacuum is created in the intake manifold that the 2nd barrel will open up. This modification will bypass the vacuum actuator on the hitachi and force the 2nd barrel to open when the 1st barrel reaches 1/3 throttle. Lets Get started shall we? Here are some diagrams of the part of the carburetor we will need to play with. You will not have to disassemble the carburetor at all, so almost anyone should be able to do this mod. Here in this figure we see the diaphragm that will need to be removed. It is held on by 3 screws (#2 in the diagram) and is also held on by the snap ring at the end of the diaphragm arm. You will want to plug the hole in the carburetor that the diaphragm connects to. After you have the diaphragm removed, play around with the carburetor a little and notice how there is a lever for the primary and the secondary barrel.
Here you can see how the wire should go. It might take a little time in order to get it just right. Here are some pictures of the actual modification on my carburetor:
And here are some short movie clips of the modification in action: Both movies are under 500k in file size, so it wont take long to download them. --- Additional Info: I suggest doing this to a spare carburetor. I did it to a junkyard carb and swapped back and forth between the 2. -Brian |
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