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Post by Johansson on Mar 20, 2015 6:02:30 GMT -5
Hi Anders If that big motor doesn't spin it , nothing will :-) Nice solid mount . Cheers John Thanks, hopefully it will hold the motor firmly in place. I will have to modify it later when I get the solenoid I´ll try to use for coupling the motor and compressor nut together, but a little bit of welding will solve that.
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Post by Johansson on Mar 20, 2015 16:31:56 GMT -5
I measured the air box and there will be 5mm clearance between the starter and the front wall. Pheeeww.
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Post by racket on Mar 20, 2015 16:41:03 GMT -5
Close
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Post by Johansson on Mar 20, 2015 16:48:56 GMT -5
I can always give the front wall a good bash with the old hammer if I need to increase the clearance somewhat.
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Post by racket on Mar 21, 2015 16:42:46 GMT -5
Heh heh , a heavy hammer is a very useful tool ;-)
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jdw
Member
Joined: January 2012
Posts: 41
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Post by jdw on Mar 22, 2015 7:44:45 GMT -5
Congrats on your success my friend!! I've been lurking daily for years to see this bad boy run I'm glad to see her run like a champ keep up the good work!!
JDW
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Post by Johansson on Mar 22, 2015 10:12:32 GMT -5
Thank you very much JDW!
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Post by Johansson on Mar 25, 2015 15:36:55 GMT -5
Over the last couple of days I have been working on the starter arrangement, and I´ve managed to build something that actually seems to work. Don Giandomenico made something similar for his GR-7 turbojet, a solenoid controlled sleeve that fits the compressor nut. I milled a sleeve from Robalon, a plastic material similar to nylon (but much harder) used to reduce friction in wood chips transporters at the central heating plant I work at. I didn´t take many pics during construction since this is a test that might have to be modified later. Here is a movie showing how it works, I ordered the motor controller, batteries etc today so when it arrives I can start assembling the bike again. Cheers! /Anders
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Mar 25, 2015 16:02:47 GMT -5
Hi Anders
Very impressive work, I think for the journal bearings this could be the way to go. Think I mite have to copy this For the Kart engine, Oh thanks for the mention :-)
Looking forward to videos
Andy
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Post by Johansson on Mar 25, 2015 16:23:28 GMT -5
Thanks Andy! So far it seems to work just fine, but the real test comes when the sleeve has to engage the nut while the starter motor is turning and let go of it once the engine is running. Copy away!
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Post by racket on Mar 25, 2015 16:33:53 GMT -5
Hi Anders
How is the engagement fork in the groove lubricated , it'll have the "socket" spinning around it at >20,000 rpm ??
Cheers John
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Post by Johansson on Mar 25, 2015 16:36:43 GMT -5
Now when the concept is proven to work I will spend some time on flow enhancing the motor mount, it is a bit bulky now so I need to make it a bit less restrictive.
The solenoid mount is on the bottom of the air box so it won´t restrict the air coming towards the intake from above, but I can easily make a different mount and extend the shifting rod a bit to get rid of the aluminum plate covering parts of the intake.
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Post by Johansson on Mar 25, 2015 16:39:37 GMT -5
Hi Anders How is the engagement fork in the groove lubricated , it'll have the "socket" spinning around it at >20,000 rpm ?? Cheers John Hi John, The Robalon sleeve material is sort of self lubricating and the shift fork has a rattling fit in the groove so I think it´ll be all right if I give it a squirt of WD-40 between the runs. Cheers! /Anders
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Post by racket on Mar 25, 2015 17:35:48 GMT -5
Hi Anders
Sounds good , I guess it'll only be running for several seconds at a time with that big starter.
Cheers John
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Mar 26, 2015 11:36:18 GMT -5
Was I ahead of my time when I tried electric start on the twin some four years ago?, motors weren't quite up to it at only 1Kw or so. And was asking a lot for journal bearings. Looks like you might have solved it Anders :-) I will say though, I did try three different coupling methods, friction bendix - overheated and 'blued' the compressor nuts. Mating bendix but it just bounced and finally miniature centrifugal clutch; showed promise but needed more motor power. I know you'll figure the sequencing but in my head I'm thinking a very slow turn as the fork pushes out followed by a ramp up in motor speed... :-)
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