cacrawfo
Member
Joined: September 2015
Posts: 11 
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Post by cacrawfo on Sept 7, 2015 21:09:22 GMT -5
I really worry about using that winch motor as a starter. It looks like the front end has a bearing, but the back end is a stamped cover and bushing. It may hold up for short runs, but what happens when it locks up? It might take out a shaft or gear inside your engine.
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Sept 23, 2015 2:51:31 GMT -5
..... but what happens when it locks up? It might take out a shaft or gear inside your engine. Just a thought Anders I wonder if it is worth putting a "weak point" in your splines adapter in case it does lock up like they have in the T58..  It would be just a matter of parting a groove behind the splines and if it does lock up, could save a lot of problems??? Ian... |
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Post by Johansson on Sept 23, 2015 4:41:41 GMT -5
I am hoping Ernie can shed some light on this, he has stated that he use the winch motor on several of his engines so it would be interesting to hear if he has had any problems with them.
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Sept 23, 2015 17:56:42 GMT -5
Yep Ernie is your man, reading his earlier posts he seems to not have had any major problems.
I wonder if it may be worth doing an autopsy on the dead starter and see if you can locate any other weak points???
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cacrawfo
Member
Joined: September 2015
Posts: 11
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Post by cacrawfo on Oct 10, 2015 19:07:48 GMT -5
Anders,
Just a reminder that during your dry motoring runs, you still need to supply fuel to the engine driven HP pump. Of course leave the HP lever in the closed position but you need the fuel to lubricate the pump. Don't run the pump dry.
Carl Crawford.
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Post by Johansson on Oct 15, 2015 8:26:20 GMT -5
Carl: I never thought of that, thanks for the information.
I will disassemble the dead starter and see how it is built, one idea I got is to fit an air port to the new one and route air from one of the earlier compressor stages through it for cooling.
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Post by ernie wrenn on Nov 10, 2015 18:25:32 GMT -5
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Post by ernie wrenn on Nov 10, 2015 18:30:36 GMT -5
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Post by ernie wrenn on Nov 10, 2015 18:41:10 GMT -5
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Post by ernie wrenn on Nov 10, 2015 18:47:11 GMT -5
Make sure ANY motor you use is a BEARING ON BOTH ENDS.. NO bushings.
You can also direct mount the motor to become a generator when the power is removed upon starting. Install a regulator to the input terminals and you can recharge your batteries.
I will put up pics tomorrow..
ernie
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Post by Johansson on Nov 11, 2015 6:02:48 GMT -5
Thanks Ernie, I appreciate your assistance a lot. Right now I am spending the workshop funds on the new bike engine but eventually I will make an effort on the Viper again and then it is great to have the plans ready.
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Post by Johansson on Nov 8, 2016 8:46:28 GMT -5
I have been busy with the bike lately and not given the Viper much love, but now we have been discussing the starter issue at work and come up with an idea. A cheap 2-stroke china engine with centrifugal clutch should be perfect for this, total cost is less than one of the batteries needed for an electric motor starter and is so small that it can be permanently fitted to the engine cradle. I have a 90 degree angle gearbox from a cardan driven Yamaha motorcycle which can be mounted to the Viper spline shaft so that the drive shaft for the starter points out from the engine, no problem with room for the engine then. The centrifugal clutch should disengage once the Viper is running and the starter motor is throttled down Would 2-3kW engine power be enough to get the Viper spinning?  |
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Post by racket on Nov 8, 2016 15:37:15 GMT -5
Hi Anders
I think you'll need a bit more than 2-3 Kw for the Viper , you'll be needing at least that sort of Kw for your JU-02
Cheers
John
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Post by smithy1 on Nov 8, 2016 16:06:05 GMT -5
Yeah...LOL, Anders, not a hope in hell...you'll probably struggle to start your JU-02 with that....you'll need a good dozen or so of those little two stroke engines to start the Viper..! There's a lot of load on them during start, accessory gearbox, oil pump, fuel pump, fuel controls, governor etc... Just the fuel pump alone takes a good 10hp to run at full noise on the test rig.
Mad Ron Laycock used to start his smaller 202 Viper powered "Blitz" truck with a 179ci 6cyl Holden engine ~85hp, which it also used for normal driving, via several belts and pulleys attached to a sliding socket attachment on the front of the viper engine.
He starts his 202 Viper powered bike with a small 3 cylinder Suzuki or Daihatsu car engine on a trolley, I'm guessing that would have ~45-50hp....
It takes just about all of my ~4hp blower's power to start my 6041 powered beast..! Our turbines are very power hungry before they hit self sustain..!
Cheers,
Smithy.
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Post by Johansson on Nov 8, 2016 17:46:09 GMT -5
Ha ha, I guess I didn´t think that one through before I posted...  Anyhows, one or several of the early german jet engines were started by 2-stroke engines so the concept is sound. I just need an engine large enough. Not a problem with our endless supply of snowmobile engines around here, I´ll ask around and hopefully someone will have a Rotax 503 engine collecting dust. |
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