OzVMX Forum
Clubroom => Tech Talk => Topic started by: noisy toy on June 02, 2012, 07:04:16 pm
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Has anyone built their own bike dyno? Not looking to do full on horsepower curves, just a bit of loading up for jetting,timing, and measure any differences.Any tips on how to go about building one would be great.
Cheers, Shane ???
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Just start with a set of rollers and a couple of straps.
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There are several kits you can buy, you have to decide if you want engine or chassis dyno. Once you decide that, you have the big ticket item, the drum/flywheel, which has to be machined and balanced expect to pay about $3-5k alone for that. Then there is the exhaust fans and ducting, and finaly a often overlooked area of silencing exhaust noise. Dyno's are useless for jetting. In order to apply a load to the engine you have to have a brake that is either electric or water, water brakes are a PITA. So your back to an inertia, with inertia your at the mercy of the software to find if the results are useful or not. SportDevices and Dynertia. After all that buying a used dyno will seem like great value, one sold recently on ebay for $8k( had wildly inaccurate outputs, but any dyno can have that). A alternative is a Iphone and the dynolicious app that even on 650hp cars is within 3-5hp.
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Thanks for all the advice. May have an old eddy current dyno i can get hold of. More the software now i think. I will look at those two sites, thanks Lozza. More for fun, not a commercial venture. Dont need accurate kw, more a comparison to any changes. 25 dunderklumpens is more than 24!
cheers
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Beware any 'old' water dynos................unless you like plumbing ;D
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Watewr dyno at the kart shop works a treat, they use it to run the motors in under load....
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Kart engines have about 15hp and bugger all torque