dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Feb 27, 2020 21:51:57 GMT -5
Hello all, after all these years watching everyone elses builds, im happy to finally be starting my own. This is my first scratch built engine, I built a turbo based engine years ago but this is on a whole nother level. Compressor is for a Borg Warner S480, 80mm inducer x 118mm exducer. Turbine wheel, with a lot of help from John, had to be figured, then modeled. A company in Pennsylvania can take my 3D model, 3D print and cast it. Heres some screenshots of what ive come up with so far. Keep in mind, this is my first go at CAD drawing, and ive only spent maybe 1 1/2 days on it. The turbine wheel is VERY rough, but it atleast gives me something to design around.
Once the engine is built, tested, and measured. Ill be hooking it up to a Holset HP841 gear reducer, fitted with reverse cut gears and an Allison 250 4th stage wheel that was cut down by John himself. I really cant give him enough credit, without him this would never have possible to get off the ground. The bike will be built with an SR 71 theme, so black, bare bones, and lots of titanium. It will also be capable of daily riding, all day if the wallet is full enough. My goal is reliability and durability. Stainless shaft tunnel that is sealed, engine driven oil scavenge and pressure pumps, and alternator.
Anyways heres some screen shots of what I have so far. Like I said, its only my second day. The last shot of the blade profile shows how rough it is, but atleast its to dimension so I can model around it while I figure out how to do it up proper.
-Joe K
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dieselguy86
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Posts: 186
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Post by dieselguy86 on Feb 3, 2020 19:23:53 GMT -5
Hi Smithy,
John graciously sent me his cut down 4th stage for measuring and build mock up. It fit the bill perfectly for my project. So it looks like I'll be looking for a 4th stager or 2.
Wonder if "reconditioned" means walnut blasted and inspected? Any rate its above what is affordable for this hobby. Id happily pay for shipping plus any extra trouble.
-Joe
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Jan 26, 2020 21:37:43 GMT -5
John....I may have a couple of time expired C30/C47 3rd & 4th wheels in the next month or so...we've got a couple going through the shop as we speak....if I can get hold of them....would you like them..?? Smithy. Smithy, would it be possible to buy a 3rd stage? Ive been watching Ebay but have only been able to find recon'd ones.
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Jan 10, 2020 19:14:27 GMT -5
John, the 30/20/50 rule of thumb, is that factoring before or after the vena contracta? The one book i have says a non radius'd hole will flow ~64% of its area. While one that is radius'd was ~81%, i could be off on the exact number, but didn't know if that played a role in how you figure out the ft hole area.
-Joe
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Dec 24, 2019 14:30:21 GMT -5
Hey jeff,
Yep, it's Joe lol. The problem with making a wheel is it sacrifices some strength. Which is ok if you want to have an engine that runs and makes some residual thrust. My problem is this engine is going to be pushed, and is going into a bike that will be driven, so needs to last longer than 25-50 hours.
Ive actually messaged Monty to see what he knows about casting. It might work better to design my own wheel and have it casted. It's not the cheapest way, but might be the best option in the end, if the price isn't horrendous. Some places want $30k for making molds. My thought is to 3d print the wheel in wax, and then go from there.
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dieselguy86
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Posts: 186
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Post by dieselguy86 on Dec 21, 2019 11:07:12 GMT -5
So getting ahold of Horace is proving to be just as difficult. Ive emailed 3 times, does anyone know him or know of a better way to get ahold of him? Im interested in his 130mm wheel.
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Nov 25, 2019 20:05:53 GMT -5
The tiny turbos i build spin up to 190k rpms, but are only spun at 2,000 rpms on the balancer.
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dieselguy86
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Post by dieselguy86 on Nov 24, 2019 16:06:45 GMT -5
I think my first option will be Horace, much better support, as well as offers other stuff gt related (fuel pump for example). Probably also easier to deal with if needing a custom part made. I need a 190mm freepower wheel that spins opposite direction of the allison 3rd stage for my turbo shaft project.
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dieselguy86
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Post by dieselguy86 on Nov 24, 2019 11:08:45 GMT -5
Thanks jeff, i went to his site and it shows he has up to 145mm! Sent him an email, I'll keep this updated...
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dieselguy86
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Post by dieselguy86 on Nov 23, 2019 19:17:31 GMT -5
Im having a hard time getting ahold of yili to purchase a 100mm ngv and turbine. Didn't know id anyone else has had any luck.
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dieselguy86
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Posts: 186
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Post by dieselguy86 on Nov 17, 2019 8:08:14 GMT -5
Holset doesn't use a/r, they use something different. Like a 19cm, 22cm etc, they should have it cast on the housing somewhere.
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dieselguy86
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Post by dieselguy86 on May 3, 2019 20:48:54 GMT -5
Super clean build man, great job!
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Apr 22, 2019 21:07:17 GMT -5
My guess is it was designed for a corrosive or harsh environment. A saltwater boat or somewhere with alot of sand. You'd think air filters would catch the sand, but ive rebuilt alot of turbos from dry/sandy areas that the compressors were absolutley beat from sand particles. Worn blade leading edges and tips, and severe pitting on the pressure side of the blades.
-Joe
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dieselguy86
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Posts: 186
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Post by dieselguy86 on Apr 22, 2019 17:44:47 GMT -5
Wheel came in today, here's my first impression: 1) titanium is gorgeous 2) titanium makes for a heavy wheel I was not expecting the blades to be so thick, pretty sure this wheel could suck in small trees and keep on going. Although the machined titanium is absolutely beautiful, next time im going to use a billet aluminum one from KTS.
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dieselguy86
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Joined: September 2014
Posts: 186
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Post by dieselguy86 on Apr 19, 2019 20:24:21 GMT -5
Hi all,
This is my first build thread here. I built my first gt around 15 years ago. Have always wanted to build a proper one since. The last few years ive started a turbo shop and and have finally collected the right bits. I'll be going with a Borg Warner k27 based engine. Turbine is 76mmx64mm 12 blade unit, compressor is 58mmx82mm titanium 7+7 wheel. The shaft is 10mm so hoping i can use some 61900 bearings i have. The shaft is measuring 9.95mm which is an easy sliding fit, but i feel is too loose. I ordered a new shaft hoping it's .01-.02 bigger.
Thinking of maybe doing a sealed shaft tunnel, using a tiny bit of bleed air to cool the rear bearing and to also help force the oil out along with a scavenge pump. But i may very well go with the loss lubrication method that the RC engines use, is just too simple to ignore.
Im also playing with the idea of converting the radial wheel to a mixed flow one to help with packaging things.
For the fuel system it'll be the normal kero, but i want to use "direct injection" instead of the evap system. Plan is to have the fuel manifold on the back of the diffuser, with johns "racket-jectors" sticking into the cc's front wall to spray.
Lots to figure out yet, but i feel i now atleast have a plan, along with most of the bits. Im not cad savvy, so it'll most likely be a "napkin blueprint" kind of engine.
Thoughts, as always, welcomed and encouraged! -joe
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