Intake design: prep work

As explained in the last post, merely making a custom intake elbow for the AeroVee on the Sonex did not yield a satisfactory mixture distribution. After some discussions, I’ve decided to fabricate an entire intake, using individual runners to the cylinders. This won’t just entail replacing the intake elbow but also designing some sort of …

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AeroVee intake experiment

The AeroVee Volkswagen conversion engine used for Sonex aircraft is notorious for having poor mixture distribution between the cylinders. During my test runs, I’d noticed that the #4 cylinder (ordered in conventional crankshaft order starting with #1 nearest the prop, which makes #4 the right rear cylinder. For some reason Sonex uses a different numbering …

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Microsquirting the NC30, part #47: New battery

As I mentioned in the last post, I left the key on and ran down the Ballistic Lithium battery. Instead of just forking over another $100 I thought it would be fun (and “cheaper”) to make my own pack. This is what the Ballistic battery looks like if you crack it open. The battery cells …

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Microsquirting the NC30, part #46: Tricky Tuning

Since the last post only got to the first tricky thing, here’s the sequel. In addition to getting the air density right, the second tricky thing has been parametrizing the volumetric efficiency. The Megasquirt engine controller can use different parametrizations of the VE. It always depends on the engine RPM, but there are several alternatives …

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Microsquirting the NC30, part #45: More tuning

The blog was down for just over a week, the machine hosting it just suddenly refused to post. This was one month after the three-year warranty ran out, but Asrock came through and replaced it anyway, probably because there is a known hardware problem on these low-power “Avoton” boards. Anyway, I’ve done a lot more …

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Microsquirting the NC30, part #44: Fuel filter bracket

As the last post ended, I had to pull out the welder and fix the leak in the fuel pump housing. Even though it’s been a while since I welded aluminum last, the corner weld worked OK. There were a few little snags but after letting it cool down I put the housing under water …

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