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Still waiting for Dyno ver. 2.0

What calculations did you do to determine the RPM and Max Pressure for set HP

Hi guys, please let me know what pump and valve you used. It looked like that valve really provided some good linear control. I'm about to build the same dyno. thank you.

Im just curious if you feel you can trust the O2 readings on a two-stroke knowing the scavenging cycle puts oxygen into the exhaust?

No fan on the radiator 🤔

Be interested in the specs of the pump, that engine seems like a pretty high RPM so do we need a pump that matches that RPM?

Would care to share the math channels used for the calculations?

Any chance you could share the design files for the plasma cut plates? I’d pay for those to save messing around.

I like the idea of using the hub. Fast, portable and convenient. I think we'll make one for our rental karts, but maybe with a pump bracket that braces against the chassis frame, vs ground.

Just wonder how oil temperature affects final readings, have you done some comparison? but great job and interesting apporach.

Thanks for taking the time to put this up. The best "engineers" are often those who keep things simple.

Hey mate, Great set of vids. I’m interested to know why you vary the load during a ‘run’ and why it is not left constant as revs are increased? Cheers and thanks for sharing!

Can I get a link or part# for the pump?

awesome work mate, hanging out for the next instalment, any advancements?

Are you still around?

A Polini Thor 250, 36hp@7500rpm is very similar to your Cart Engine, they just put a Belt/Gear Drive on it for Airplane use. www.polinithor.com/en/polini-thor-250-thor-250-ds-2/

It would be really nice if you put in the Comments above, what your Testing, like Rotax 125cc, the Bore & Stroke & CR and Carb Size used, what the Factory Stock Rated hp@rpm is, and then what you really got for hp@rpm on your Dyno. Can you break it down to 100rpm or 250rpm Increments? Ideally, on a Perfect 2 Stroke Engine running 11.5cr, proper Size Carb with a Good Tuned Pipe for a Sled or Ultralight it takes 7cc to make 1hp. So a 125cc/7cc = 17.8hp@6500rpm. Also, a Material List and a Basic Schematic of the Dyno. Like what is the Max HP you can Test with it? Maybe put some web Links to the Parts you used. A 460 Honda/Clone 4 Stroke Single upgraded Dynoed 37.37@5000rpm, and Singles go up to around 676cc today. Like I'm more into Old Skidoo/Rotax 2 Stroke Singles for Snowmobiles (7000rpm) and Ultralight Airplanes (6500rpm). Most of these Engines only used a Can Muffler, so lots of hp to be found with a Good Tuned Pipe, a Bigger Carb, a Higher CR, and Porting. You have a 250, 292, 277F, 299/300, 318/320, 335/340 and the 277UL engine. On Sleds, you had the Standard Engines, the TNT Engines, and the Blizzard Free Air Engines. The 340 Blizzard was the Highest hp Single, Stock was 36hp. USA Part 103 Ultralights only need 25hp to 40hp Max. The Empty Weight of the Plane can only be Max 254 lbs. The 277UL was probably used on 85% of the Ultralights made in the World, rated 28hp@6400rpm with a Muffler.

Hello Great idea, since some time I am also planning a biuld of dyno for kart and another one for 1000HP. I guess you did not directly proper measurements from Mychron, since pump losses are not linear and hard to consider. You may make the pump floating and measure the actual torque with load cell. There are load cell to 10V converter for 30usd. Feeding the Mychron with actual torque and RPM will make great field dyno. Cheers

Enjoyed your series of videos, great Covid project for karters. I have been planning a hub style dyno for or karts as well using the hydraulic pump but with a torque arm. The pressure sensor and using the mychron was an interesting angle.

I know this has to be hard to set up looks like your doing all this work by your self. It's hard to hear you at times, but good job I like your videos.