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Author Topic: 650cc A-BG build TDR  (Read 7868 times)
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wobblywalrus
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« Reply #30 on: December 13, 2012, 11:51:38 PM »

It will not be too hard to change motors with that setup.  All of that trianglation looks good.
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MTABike
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« Reply #31 on: December 28, 2012, 03:55:06 PM »

Thanks guys!  cheers I'll keep plugging away.  It's mostly a lot of tig work now until I get my rear axle plates sorted.  I think I've finally convinced myself to stop adding tubes, although Tom's (koncretekid) recent frame issues have given me pause. I do think that the fact this frame is all 1.25" x 0.120" wall DOM tube should help.  Thanks for looking folks, SpeedWeek is only 8 and a half months away shocked
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Koncretekid
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« Reply #32 on: December 29, 2012, 06:54:14 AM »

Your tubing, 1.25" x .120" vs. 1.00" x .060" (my tubing) is approximately 2.3 x stronger in compression and tension, and 2.7 x stronger in bending resistance.  My failures were fatigue related to the rear tail section bobbing up and down which induced cyclical loading combined with a bending stress caused by attachments.  After the first tube failed, I apparently continued to run which accentuated the stresses applied to the rest of the structure.  Use a nice high gloss paint and inspect the frame regularly for cracks. I've basically come to the conclusion that no one could have predicted the failure of my first tube, the vertical unbraced strut that supported the rear section.  All designers eventually run into situations leading to failures that weren't predicted.  That's when you add another tube or make the existing one stronger.
Tom
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Hellcat Customs
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« Reply #33 on: January 07, 2013, 12:38:15 PM »

I really like the chassis work... neat concept nice execution.... You are making a support bracket for the turbo as well yeah? I've never had any luck just having it hang from the header...then again mine have never been 4 cyl headers either...maybe the extra primaries help carry the load.
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MTABike
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« Reply #34 on: January 07, 2013, 02:37:12 PM »

Jason,
Thanks for the compliment on the chassis.  There will certainly be something other than the exhaust manifold holding the turbo up.  I actually plan on moving the turbo away from the ground with a new manifold.  The one you see was something that went together on a whim because I needed to build something for the bike while I was in the planning stages.
~Scott
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Hellcat Customs
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« Reply #35 on: January 10, 2013, 12:17:04 AM »

Awesome! Personally I've had manifold failures because I only supported the turbo on one side....granted we are into turbo Harleys and have horrible vibrating tractor motors... So it may not be a problem. I always end up over building stuff.
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55chevr
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« Reply #36 on: January 10, 2013, 06:38:38 AM »

Harley V twins are tough on turbo exhaust manifolds.   I have tried a couple of different ways of supporting them.  What has worked the best has been supporting the turbo from 2 points to the engine, not the frame.

Joe
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Hellcat Customs
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« Reply #37 on: January 10, 2013, 09:50:57 AM »

Found the same out the hard way... the other weak link is the exhaust flanges/retainers... Found out that welding the flanges to the header made it so the header can't rock around and wiggle so much which really helped a great deal.
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V4F STR 60
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« Reply #38 on: January 13, 2013, 06:54:32 PM »

You really need to spend less time in the shop and a little bit more plowing my driveway   cheers
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