The technical adventures of Dr_C

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Sorry to hear about your friend. I lost one myself last weekend when he crashed his bike.
We must remember to stay sharp with the margins on our side while riding...
 
jon andersson said:
Sorry to hear about your friend. I lost one myself last weekend when he crashed his bike.
We must remember to stay sharp with the margins on our side while riding...
Click to expand...
Thanks, Jon, and back to you! Given our mutual interest and geography, I'm assuming we could both be missing Anders Mansén?
 
It just realized that we might be missing the same friend so I came here to ask that question.

Yes it is Anders..

We had a friendly enduro competition on Åland this weekend and as he was supposed to be there with us we had a minute of silence before the start. The choice was taken not to cancel but to do it to honor him. He is missed, a very nice guy.
 
Well, I guess placing the coffee mug next to the water jar, which I'm dipping the sandpaper in, was to ask for it. Gives a harsh aftertaste to the coffee. So, I've tested it so you will not have to!

Happy holidays to you all!

BTW. I retightened the copper head gasket, but the nuts/bolts didn't move at all. It is still tight after 3-4 warm ups.

71a66be6c470ff56f55423287caf1bfb.jpg
 
spanner said:
Very nice:cool:

Will you be able to run it without the balancer?
Would be nice to compare:)
Click to expand...
We are running it "as is" first, to help getting numbers on the elastic deformation. This will help me to determine if there is a bearing solution available to cope with the "warping" of the crank shaft. In other words, let the crank move free! If the loads are of a magnitude exceeding what bearings can deal with, or other side effects are unacceptable (fx if the crank pin will submit to fatigue), I will get back to redesigning the crank. Running it without the CB will be done when investigating the solution involving a spherical self aligning roller bearings on both sides. I will post!

Anyone know how to get the youtube-video to repeat continously?
 
Dr_C said:
We are running it "as is" first, to help getting numbers on the elastic deformation. This will help me to determine if there is a bearing solution available to cope with the "warping" of the crank shaft. In other words, let the crank move free! If the loads are of a magnitude exceeding what bearings can deal with, or other side effects are unacceptable (fx if the crank pin will submit to fatigue), I will get back to redesigning the crank. Running it without the CB will be done when investigating the solution involving a spherical self aligning roller bearings on both sides. I will post!

Anyone know how to get the youtube-video to repeat continously?
Click to expand...

At least in some browsers there's a right-click menu on the video and a Loop entry there: You Can Now Loop Videos Directly in YouTube

It's probably always going to be a little choppy, so best to "hand-loop" the source video a few times before uploading.
 
tourist said:
At least in some browsers there's a right-click menu on the video and a Loop entry there: You Can Now Loop Videos Directly in YouTube

It's probably always going to be a little choppy, so best to "hand-loop" the source video a few times before uploading.
Click to expand...
Not possible in Explorer 11, but Google Chrome works ok. The video needs to be looped for a better understanding of the forces, unless you have a lizzard-fast perception and the brain process capacity of Verbal Kint.
 
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At 9200rpm, 15 deg ATDC in the combustion stroke, the angular deviance is close to 0,5 deg. No ordinary bearing types will cope with that!

I'm thinking spherical ball bearing (SKF 1206ETN9) and let it "all hang out". Anybody had a go with those?

/Dr_C

46eacc8ec46577e28d7ce28e07a50bdf.jpg
 
I use 22206 spherical rollers should be similar to those dr C

0.1 mm axial play and steel sleeves to spread axial loads nicely into the cases

120 hrs with up to 10 k rpm cases and bearings still good

Piston cracked at 100hrs liner at 100 hrs and 5 min lol

Big end died at 120 hrs so the mains and cases in this configuration are very good

Approx 75 rwhp
 
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bushmechanic said:
I use 22206 spherical rollers should be similar to those dr C

0.1 mm axial play and steel sleeves to spread axial loads nicely into the cases

120 hrs with up to 10 k rpm cases and bearings still good

Piston cracked at 100hrs liner at 100 hrs and 5 min lol

Big end died at 120 hrs so the mains and cases in this configuration are very good

Approx 75 rwhp
Click to expand...

Thanks, Bushmechanic! Yes, I have followed your succesful trials! Are you using the 22206 on both sides?
 
Yes both sides on the 80x100 engine with lightened crank

0.1mm axial play

The 80x105 engine has only one 22206 on the drive side

The other side is a special NTN NJ206 ET2XCS46 this available through KTM, part Number 50330082000
0.8 mm float
 
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The smaller the "imbalance" of the crank, the lesser the deformation/bending will be. Maybe there is something to gain with smaller stroke, but not a great deal, IMHO.

The alternative solution involving increasing the thickness of the crank webs (20 to 29mm), to increase the length of the crank pin press fit, didn't help as much as I had hoped. When the pin is of about the same e-modulus as the webs, increased length of press fit doesn't help so much with reducing the bending of the crank. A sturdy crank pin is a good thing in any case. Keeping the mains as close as possible to the webs is another. Then it is a matter of choosing either to restrain the bending of the crank with bearings, or choosing bearings that will let it fly free!
 
its fantastically interesting this problem because you cant see it in real life action :D

in your analyisis drC where in the stroke is the crank deformation greatest ?

im also curious on your thoughts about how best model the crank case stiffness or contribution to restraining the crank axially
 
I might have already asked, but - Are there disadvantages to the self-aligning ball bearings?
 

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