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August 26th, 2017, 01:58 AM   #531
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I suggest you try to squeeze out a few more hp now.
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August 26th, 2017, 02:15 AM   #532
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Originally Posted by makazica View Post
No problems?!?
You must be doing something wrong!! Tear it apart and check whats happening, thats not normal.

Absolutely! I'll have to check why it is working!

Last edited by Dr_C; August 26th, 2017 at 06:34 AM.
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August 26th, 2017, 02:35 AM   #533
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Originally Posted by jon andersson View Post
I suggest you try to squeeze out a few more hp now.
Yes, that seems like the obvious way to go, doesn't it...

It is too difficult to control the throttle from 0 to 10%. The power is coming on too strong instantly. The oval shaped throttle from the Ducati 1198 opens a lot the first 3-5 degrees. I've got a throttle handle with a progressive cam profile, but I may need to manufacture a larger wire drum for the throttle body, and/or reduce the ignition advance in that region of the ignition map.
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September 10th, 2017, 10:37 AM   #534
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I'm trying to pay tribute to Swedish innovators, designers and engineers, whenever possible. For instance, this home made hydraulic press, is based on the cylinder pushing out the nose wheel on a Saab J37 Viggen (fighter jet). New o-rings to come!
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October 15th, 2017, 08:17 AM   #535
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Why on God's green earth didn't I have a tube notcher when I manufactured the supermono chassie?

I'm soon running out of excuses not to start up my café racer build...
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Last edited by Dr_C; November 4th, 2017 at 02:42 AM.
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October 15th, 2017, 02:33 PM   #536
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Tube cutter Simple nice and cheap and a time saver. If You can weld ? Not talking about You Dr_C on welding
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November 4th, 2017, 02:45 AM   #537
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I thought two practise sessions without problems was too good to be true! Well, if some internals in the first muffler are cracking, is no big deal!

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Last edited by Dr_C; November 4th, 2017 at 03:54 AM.
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November 4th, 2017, 01:09 PM   #538
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[QUOTE=Dr_C;183513]I thought two practise sessions without problems was too good to be true! Well, if some internals in the first muffler are cracking, is no big deal!

brittle failure at the heat affected zone-
possible causes -
water quench, (snow quench where you are?)
use of old rods or rod that is not suitable ? sometimes pre conditioning in an oven can help (say 180-210 F) (although that looks MIG not ARC so wire type)
Sometimes known as hydrogen embrittlement - stick it in the oven after welding at 450F for an hour
Circular work can also need pre heat to avoid inbuilt stress - think coefficient of thermal expansion applied to the circumference and subsequent shrinkage impact to diameter

Last edited by 383hq; November 4th, 2017 at 01:27 PM.
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November 5th, 2017, 01:09 AM   #539
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Originally Posted by 383hq View Post
brittle failure at the heat affected zone-
possible causes -
water quench, (snow quench where you are?)
use of old rods or rod that is not suitable ? sometimes pre conditioning in an oven can help (say 180-210 F) (although that looks MIG not ARC so wire type)
Sometimes known as hydrogen embrittlement - stick it in the oven after welding at 450F for an hour
Circular work can also need pre heat to avoid inbuilt stress - think coefficient of thermal expansion applied to the circumference and subsequent shrinkage impact to diameter
Thank you for the interest!
This is TIG-welded and as you can see on the previous photo, I have avoided welding the whole way around, to avoid possible shrink tension.
This muffler is the first of two in this system, so there are some stresses added to the design from the outlet of the muffler too. The engine vibrates a lot (I have already cracked two rear shock shafts and two lower attachment forks), so I put my my money on fatigue cracking, which of course will show in the HAZ. Initially I put some reinforcements between the outled end cap and the perforated tube (see photo), but I didn't think it would be necessary to do the same between the inlet chamber and the perforated tube. I was calculating on that the chamber would guide the carbon fibre canister enough. With the vibrations at hand, this turned out to be a bad decision. Now I have welded similar reinforcements to the inlet side, and the muffler is complete again!

Have a nice weekend!
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