Building your own Dyno

[Sandblaster]

When is the first dyno run scheduled?

[Crofter985]

That's a good question. It's mostly there now but there will be a day or so of fabrication at least. I still have to read through the manual to see what I might have to do in the setup. I have it with me at work so I will read when I get a chance.

Really hoping its next week. I would really like to get this done and get back to the KLX build.

I forgot to say that bike of your dads looks like a fun thing. The video was titled 2 oneo there is a aprilia tuono. 1000 v4, street fighter style. That will be the bike, eh? Aprilia bikes are popular as track bike, rightly so, racers for the road

[Sandblaster]

Yep, that's the bike.
It should be a fun ride

[Crofter985]

Not much of an update but it is what it is. I was home for a few hours and while in the shed I spotted this wheel and tyre, it gave me an idea.

I have been wondering what to do about the rear tyre of the KLX, I have a Michelin racing wet mounted on the bike just now which I initially thought would be an ideal choice but have now found out that sticky tyres can be quite power robbing on the dyno. So I was looking for a tyre to fit, then I noticed the tyre that came off the KLX originally, a 130/80-17, a little bit worn but not much. I had a pair of supermoto rims on crf450 hubs, the rim is 5" but I thought I would mount the tyre on and see how it looks. Well you can see it went on, I think it looks ideal, opening out the tyre beads has flattened the worn bit even more and the tyre can stand on its own now. I will see how it goes, at least fitting this will mean the Michelin wet won't get torn up on the roller.
I also intend to knurl the roller. I'm going to make a device to press knurls on to the roller to form a surface profile, something that will come off and be able to go back on again to do the job again if the knurling gets worn off.

Hopefully back to dyno building at the weekend.

[Sandblaster]

I wondered what your were going to do about that.
I had designed a knurling fixture about 20 years ago that could knurl both directions at the same time to save machine time.
Oh well, it would take you longer to design and build the fixture then to just turn the roll over and knurl the opposite direction

I didn't know that the softer tires reduced dyno numbers.
Oh well, I will run my soft sticky street tire regardless.
I'm interested in percentage of increase more so then actual HP numbers.
Then I have several mods I want to install and run one at a time

[Crofter985]

If you are putting heat Ito the tyre then that's energy lost. I think the tyre pressures should be increased too.
That wheel has no Cush drive though so it's not ideal, but it was there and so was the tyre. See how it goes.

There is a lot to setting up this dyno, I might have known, with it being an entry level commercial set up, there is a lot of detail in it. It has a pickup clamp you put on the plug wire, so it has a rpm feed. You can tell if you are getting tyre slip and how much. But I think that's a test on its own then you have to enter that figure in for sucssesive tests.

You can also feed in info from the oxygen sensor, exhaust gas temp, water temp, boost, etc, basically k type thermocouples and 0-5v sensors. And it would seem you can include that info on the power graph.

But the guy who is the uk agent has dragged his heels at every point. I have not been on at him about it enough though, the main interface unit I paid for it and I did wait a month before I phoned to enquire where it was. I'm still waiting for the weather correction thing. That was ment to come with the interface itself.
I hope the set up part goes smoother. I can see that being a bit of time too, not just a mornings work and away we go.

[Sandblaster]

Oh man... That is gonna be a job.... But you can do it

[Sandblaster]

I'm having dyno envy....

[Crofter985]

Have dyno envy when it's up and running. Dyno envy just now is too much pressure.

[Sandblaster]