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Author Topic: Custom Racer with Aluminium Frame and Sportster Engine  (Read 2134 times)

Offline jpmobius

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #50 on: Jan 30, 2018, 10:23:33 »
Two observations - please ignore if they are the result of seeing it as a mock up.  1) There looks to be a lot of unloaded drop in the swing arm angle.  Generally, you'd want the loaded ride height to result in a straight line for the drive sprocket center, arm pivot center and driven sprocket center to maintain minimum chain issues.  2) The angle between the pivot to shock mount and the shock looks large (hard to tell from the pics).  Generally, you'd like this to see this angle move toward 90o as the travel moves toward full compression.  This obviously yields an increasing rate for the damping and spring.  Moving away from 90o results in the opposite of course - just curious if you have a design intent here.  Looks like a great job so far - looking forward to more progress!
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline killerx

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #51 on: Feb 02, 2018, 13:23:51 »
I think I am suffering withdrawals waiting for an update.
05 Victory Hammer(110hp 115tq @ the wheel)

73 Honda Cl350(Haven't decided what to do with it) SOLD

75 Suzuki GT380

Too much of everything is just enough.

Offline LightsOut

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #52 on: Feb 08, 2018, 10:13:43 »
That looks fantactic! Really stoked to see where this is going. Impressive work to say the least.


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Online The Jimbonaut

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #53 on: Feb 08, 2018, 10:32:33 »
Man I don't know anything about ride geometry or swing arm angles or anything like that, and so it's really interesting to watch an actual frame being built like this.  It gives me a really unique perspective on the actual mechanics involved - I'm especially intrigued by the swingarm/monoshock/frame linkage. 

Thanks for taking the time to document all this, it's an education.
"I'm telling you Donnie, nuthin' but nuthin' but right"