E30 M20 C191 Plug Replacement

The C191 plug connects the fuel injector harness to the rest of the electrical system. A bad C191 plug can lead to all sorts of problems - hard starting rough idle lack of power fault codes for fuel injectors or temp sensor The location of the C191 plug makes it susceptible to water. Check out... Continue Reading →

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M20 Engine Specs

Here are the specs of my initial M20B28 engine build. I started with a standard M20 2.5 that was mostly complete but partially disassembled. A 2.7 crankshaft, connecting rods, and flat-top pistons came with it. The 2.7 rods and pistons are commonly used in turbo builds. I used the 325i rods and custom Wiseco pistons.... Continue Reading →

M20 Conversion Basics

Could there be an easier engine swap than an E30 325i M20 into a E21 323i? Actually, yes: an S52 into an E36 is pretty plug and play. But this almost as easy. There are a few really good guides online, including the ones covering 320i swaps. They didn't always apply to my project so... Continue Reading →

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