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Post by racket on Feb 20, 2024 18:58:41 GMT -5
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Feb 20, 2024 19:30:35 GMT -5
With a nice price tag...Lucky is who can afford it
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Post by racket on Feb 20, 2024 19:33:03 GMT -5
Hi Richard
Yep , a tad pricy :-(
Now if only I could find a suitable turbine wheel :-)
Cheers
John
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praendy2203
Veteran Member
Joined: August 2020
Posts: 183
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Post by praendy2203 on Feb 21, 2024 0:41:35 GMT -5
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CMDR_Boom
Member
Joined: September 2019
Posts: 38
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Post by CMDR_Boom on Feb 21, 2024 9:37:44 GMT -5
All this talk of compressors over 170mm has me tempted to go shop MTM Marine compressor wheels again. My wallet got scared off last time they started quoting prices at 28.6k US for a used one. Yipe yipe yipe yipe!
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Post by racket on Feb 21, 2024 15:27:24 GMT -5
Yep , once we start going past the mass produced stuff the price climbs very rapidly .
LOL...............trying to find wheels at a reasonable cost is harder than making the engine for it .
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Feb 21, 2024 15:31:53 GMT -5
Do tou know of anyone attempting to cast its own in aluminium? Wonder if an home made casting would hold the stress..
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Feb 21, 2024 19:05:14 GMT -5
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CMDR_Boom
Member
Joined: September 2019
Posts: 38
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Post by CMDR_Boom on Feb 22, 2024 4:15:57 GMT -5
Do tou know of anyone attempting to cast its own in aluminium? Wonder if an home made casting would hold the stress.. I've seen people makes compressor wheel casts of aluminum and bronze, but I wouldn't run them without doing a hardcore laser balance operation, and I certainly wouldn't push them very hard. I'd be Very dubious running a bronze wheel. I do have a few factory cast compressors for CAT turbos in the T6+ size range, but I've never been tempted to run them over getting a serviceable aerospace-grade take-off for example. Much agreed with Racket though. While it's kind of fun to chase down old military parts or non-flight ready components (after they time out for flight service, they normally have plenty of life left for ground-only duty), it's a fine balance of time consumed finding one at near scrap prices and sellers who get them from salvage places that automatically correlate 'jet parts' to Unobtanium type pricing. I've picked up a few relatively cheaply by messaging the seller to let them know what I do with them versus some who will buy it for art display or have no idea what they're trying to sell. |
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Post by racket on Feb 22, 2024 16:56:14 GMT -5
Hi Richard
Interesting air "pressure" within the spin chamber during the ABB over speed testing of the comp .
Cheers
John
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Feb 22, 2024 17:35:55 GMT -5
Yeap My guess is that by taking the air pressure down they obviously lower its density so that the wheel is "seeing" same load at 22K rpm as it would at its normal working speed of 18K rpm.
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Post by racket on Feb 22, 2024 17:47:16 GMT -5
0.7 Mbar - 0.01 psi a pretty good vacuum , no turbulence within the chamber to affect vibration of the rotor , also minimal horsepower required to spin it
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Feb 22, 2024 17:51:42 GMT -5
Oups tou re right I tough it was 0.7 bar... Different story..
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