This page describe modifications that I performed to make the engine work in the sandrail.
Intake Manifold changes:
The stock 12A intake manifold has a whole bunch of junk attached to it that is used for emissions control. I’m not sure what all the junk does, but it seems to be a group of valves that control the flow of the smog pump into the exhaust system. Since it was an ugly conglomeration of junk, I decided to do away with it and fit an aluminum plate (milled with a sherline milling machine) over the opening. Below is a picture of the parts that I removed, and the plate that replaced them.
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| Above: ugly old intake emission valve assembly | Above: Aluminum plate fitted over hole in intake |
Eventually, I just said to hell with the whole mazda carb mess, and ended up going to a modified holley carb.
Simplified wiring Harness:
My engines didn’t come with a wiring harness, so I had to make up my own. Here’s the bare minimum necessary to make the engine run:
(Click the image for a full-size schematic)