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Post by racket on Oct 15, 2018 0:38:17 GMT -5
Hi Monty
32,000 rpm max , yep , she's got "warts" ............I don't like the flow path downstream of the turb wheel , it needs to be axially longer but that would further exacerbate the overhang of the turb wheel from its bearing ............I'd prefer the gas flow going the other way .
Cheers John
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Post by azwood on Oct 15, 2018 3:59:49 GMT -5
Interesting build where did you get those gears can you post a link I'd like to do something similar I'm worried the bike diff I have won't like the rpm with its large needle roller bearings.
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Post by racket on Oct 15, 2018 15:53:16 GMT -5
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Oct 17, 2018 1:19:55 GMT -5
Looking good John, think the gearbox you already made is wonderful, as long as it makes wheels turn :-)
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Post by racket on Oct 17, 2018 2:35:16 GMT -5
Hi Andy
Yep , the turbine wheel spins freely and the output shaft goes 'round and 'round :-)
Cheers John
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Post by azwood on Oct 17, 2018 3:13:15 GMT -5
Hi Andy Yep , the turbine wheel spins freely and the output shaft goes 'round and 'round :-) Cheers John what bearings will you use ceramic of some sort I'm interested in this as its one of my biggest hurdles to finishing my kart.
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Post by racket on Oct 17, 2018 16:18:41 GMT -5
Hi Aaron
The current gearbox has its standard bearings as its not possible to replace some of them as the gearbox is basically a non repairable type, I'd probably do damage to gears trying to change bearings.
The new gearbox I want to make will have standard "rattly" C3 grade sealed bearings which should cope with the very limited duty cycles , I don't want a complicated gearbox , so splash lubrication of the gears from either oil or even grease............I want it to be an easily repairable unit if possible .
Cheers John
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Post by azwood on Oct 17, 2018 19:56:00 GMT -5
Hi Aaron The current gearbox has its standard bearings as its not possible to replace some of them as the gearbox is basically a non repairable type, I'd probably do damage to gears trying to change bearings. The new gearbox I want to make will have standard "rattly" C3 grade sealed bearings which should cope with the very limited duty cycles , I don't want a complicated gearbox , so splash lubrication of the gears from either oil or even grease............I want it to be an easily repairable unit if possible . Cheers John Sounds good nice and basic how do needle rollers go with high rpm in say 40mm od I'd love to use the bike diff as I already have it but I'm not sure it will last long peak rpm for the bike is about 12k not sure if it had an overdriven top gear but it was good for 220kmh and had 145hp I think strength wise its fine just worried about the bearings guess I can see how it goes.
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Post by turbochris on Oct 19, 2018 12:45:41 GMT -5
TPE331? we wanted to use the compressor out of one on a pro mod engine
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monty
Senior Member
Currently being spanked by mother nature.......
Joined: September 2018
Posts: 400
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Post by monty on Nov 6, 2018 8:18:15 GMT -5
John,
Thought you might enjoy these pics. This is a gearbox my students designed for a race car. The pinion can spin up to about 10K rpm. It has been terribly abused and is being retired to the display case. At one point it ran for a couple hours being lubricated only by muddy water. It's still functional, but all the other components around it have changed in the interim, so it's being put out to pasture.
Monty
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Post by racket on Mar 3, 2019 19:49:12 GMT -5
Hi Guys A couple of pics of the new gearbox castings which arrived this morning , I have 2 sets in case I stuff up on the first machining ..........................thanks Andrew for getting them done for me They're solid heavy duty . Cheers John
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Post by Johansson on Mar 4, 2019 13:50:29 GMT -5
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elventu
Veteran Member
Joined: October 2018
Posts: 122
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Post by elventu on Mar 4, 2019 15:22:04 GMT -5
Good looking castings!
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Post by racket on May 17, 2019 23:10:15 GMT -5
Hi Guys Started doing a bit on the gearbox castings I'll get the bearings into the 2 pinion snouts first , then work on the main gearbox bodies. Cheers John
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Post by racket on Jun 6, 2019 4:32:56 GMT -5
Hi Guys The pinion side of the gearboxs have bearings fitted , so time to have a play with the main bodies , they were setup on the faceplate and the output snout was machined to allow fitting into the chuck to allow machining of the mating face and gear recess along with the bearing cavity , its taking a while but so far things are progressing steadily , hopefully a few more days work and both sets of cases will have their bearing fitted . Cheers John
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