reedy
Veteran Member
Joined: January 2017
Posts: 111
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Post by reedy on Jan 16, 2017 5:39:26 GMT -5
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reedy
Veteran Member
Joined: January 2017
Posts: 111
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Post by reedy on Jan 16, 2017 5:35:22 GMT -5
some photo,s of my turbine wheel ,shaping and grinding of the wheel makes the most improvement to temp,s of the turbine. The round block is a clamping aid when twisting the blades and helps when grinding out the root stops me going to deep.these where cut at a 40 degree angle which automatically gives you the leading edge chamfer and thins the trialing edge,also widens the cord of the blades now 11.4mm compared to 10.4 in the book. it also means the root is more open.the trailing edge is important too thick gives you drag same as an aircraft wing.the photos are an unfinished wheel roughed out ,still needs final shaping with files. Hope the photos come out Ok, it's the first time i've done this.
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reedy
Veteran Member
Joined: January 2017
Posts: 111
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Post by reedy on Jan 15, 2017 10:20:48 GMT -5
Hi Jeff Glad to here that,I made a lot of scrap early on with jet building, Kamps book does say to leave a expansion gap but they found it does give you problems,when I welded mine i always stress relieved it with a blow touch then m/c out the turbine housing minimum clean up and then m/c the hole out slide fit the bearing tube,if it does distort with the first few runs on gas i just locally grind with a dremel grinder trying to keep the clearance as tight as I can. back tracking a bit through your posts the fit of the bearing needs to be a slide fit on the shaft and in the bearing tube but the compressor wheel should be a shrink fit using heat from a hair dryer the turbine just needs to be a tight slide fit make sure you use grease or something like copper ease,tolerance in Kurts book is 8mm -0.002 -0.005 for the shaft and 22mm +0.01 for the housing. If you don,t get the fit right on the compressor wheel and it ends up a slack slide fit you well never get it balanced,the compressor end is always the hardest to balance as it overhangs from the bearing and you have to take it off to fit it in the engine.
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reedy
Veteran Member
Joined: January 2017
Posts: 111
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Post by reedy on Jan 15, 2017 6:26:59 GMT -5
Hi Jeff, it's Chris from youtube.bit late but when you make the Kamps NGV make the inner part with blades a tight sliding fit in the outer tube otherwise it moves around altering the centring, when you look at the kj66 it's fully welded or cast solid.
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