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you're going to find a TON of power in ignition timing. I can't wait for the results. Did you pick up the 2 stroke tuning books yet?
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Jun 8, 2015 08:41
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| # ¿ May 14, 2024 10:35 |
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Steak Flavored Gum posted:Nope. I guess another 360 owner has made them and has them for sale, but they are ridiculously loud even with mufflers and I'm really not sure that that's a road worth looking down. The power band would be absurdly restrictive, even worse than it is now. Making reed valve cages would be a much better path forward for keeping the car "streetable." There's no real magic in tuning 2 strokes. But there's a whole lot of math. Tuned pipes can be tuned to have broad powerbands, with long closure cones on them. It makes them less peaky, so you get less peak horsepower, but it's always better than a big muffler. Since tuned pipes depend on air temprature to control what frequency they're resonant at, you can use ignition and fueling to adjust the active frequency range of the tuned pipe. By leaning the fuel out at low rpm, you can have cooler exhaust going into the pipe, making it work at lower rpm. At the high end, shifting the ignition event later, and enrichening the mixture allows still burning fuel to go out the exhaust, raising the temperature of the tuned pipe, and making the pipe resonante at higher frequencies. Tuned pipes can be quiet, it's just nobody ever "does" it. You still need a muffler sized for a 180cc for each cylinder, on top of the tuned pipe. most of the time people put on a muffler that seems "the right size" for the stinger on the end of the tuned pipe. That's definitely not the right size. And now come the crazy ideas... For inshore powerboat racing, variable length tuned pipes are a common thing. They also have been done on gokarts. You've got an electronic controller, there's no good reason you couldn't have that drive a servo and have VTEC YO! on your mazda. While we're on that subject.. Honda's powervalve implementation can be done purely as part of the exhaust system. Honda uses a chamber at the start of the exhaust to delay the exhaust pulse and bring the exhaust tuning lower down.
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Jun 8, 2015 18:24
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