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Author Topic: Custom Racer with Aluminium Frame and Sportster Engine  (Read 5749 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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Offline 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"

Offline Karlloss

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #54 on: Feb 25, 2018, 09:20:01 »
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. 

Are you just saying random things that come into your head?  Clearly there is no load therefore there will be drop, itís call suspension movement.


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Online J-Rod10

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #55 on: Feb 25, 2018, 10:04:06 »
Are you just saying random things that come into your head?  Clearly there is no load therefore there will be drop, itís call suspension movement.


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That thing is going to have to come up a good 6" to be parallel to the ground. Not likely the shock has that much travel. So, no, he isn't just saying shit. He has a very valid concern.

Offline Karlloss

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #56 on: Feb 25, 2018, 10:07:27 »
That thing is going to have to come up a good 6" to be parallel to the ground. Not likely the shock has that much travel. So, no, he isn't just saying shit. He has a very valid concern.


6 inches you say, looking at the images Iíd say much less that 6 inches, but hey if you think that distance is 6 inches I can see how you bluff your wife


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Offline Hurco550

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #57 on: Feb 25, 2018, 10:10:13 »
Here we go. Probably another thread that could be awesome that'll get shut down, or the op won't return because some dude forgot he wasn't in kindergarten anymore.



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"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Karlloss

  • Posts: 220
Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #58 on: Feb 25, 2018, 10:13:34 »
Here we go. Probably another thread that could be awesome that'll get shut down, or the op won't return because some dude forgot he wasn't in kindergarten anymore.



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I agree, so many armchair engineers making dubious statements about angles and picking fault with an awesome build.


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Offline Hurco550

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Re: Custom Racer with Aluminium Frame and Sportster Engine
« Reply #59 on: Feb 25, 2018, 10:14:24 »
I agree, so many armchair engineers making dubious statements about angles and picking fault with an awesome build.


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Yep, described yourself perfectly. Good job.

Sent from my SM-G920V using Tapatalk

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet