miuge
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Post by miuge on Oct 16, 2019 11:04:18 GMT -5
I'm looking at fitting a "wastegate" into the interstage duct , I've got a short length of 75mm stainless tube that I'll "blend" into the ductwork to "unload" the gas producer when the freepower is stalled , it'll need some sort of blanking off arrangement for when the freepower is spinning at >25% N2 Hi John, This type of exhaust cutout valve could do the job, they're available in various sizes up to 102mm: www.aliexpress.com/item/1789883828.html
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miuge
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Post by miuge on Mar 30, 2019 6:02:53 GMT -5
Instead of using time and effort modifying your oven nozzle, could you source an oil burner nozzle? They're cheap and works well, but will require somewhat higher pressure for fine atomizing. We used a EFI fuel pump with max. 8-9bar. Idling at 0,5bar P2 required less than 2bar fuel pressure and combustion was still ok, TOT at 430 degree Celcius. Full power at 2bar P2 required almost 9bar fuel pressure.
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miuge
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Post by miuge on Jan 29, 2019 16:04:25 GMT -5
Sounds like it's the regulators causing the problems, fluctuation and extinguishing of the flame, replace them with simple ball valves or needle valves as suggested. Been there...
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miuge
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Post by miuge on Nov 24, 2018 7:27:37 GMT -5
Our bike had a 2.2" inducer turbo with a 4.5" x 13" FT, worked quite OK with kero/diesel too. As John mentioned, high pressure for a simplex nozzle is highly recommended, EFI pump will barely do.. I'd say 4 to 5bar over P2 will make a good atomization on a typical burner nozzle. With an evaporator type combustor you'll be good with less fuel pressure, also pump flow requirements are fairly low for the size of comp.
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miuge
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Post by miuge on Nov 22, 2018 2:24:04 GMT -5
While looking for a good price on the HX82 wheel..... The specs for the wheel are 150.3mm / 131.62mm (in/ex) That could be the answer right? Too bad it's that pricey.. I'm quite sure Kinuqawa is not the only aftermarket supplier, just need more searching.
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miuge
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Post by miuge on Nov 20, 2018 15:15:29 GMT -5
Has anyone information for the Mitsubishi TF/TD15 turbine wheels? These seem to be used in various big machines, CAT, Yanmar etc. It might be just equivalent to HX82 and GT60 -series turbos based on comp sizing, but I remember even the TD13 turbine was already around 110mm exducer? I only managed to find some price tags for OEM parts which was several thousand USD.... but probably someone makes an aftermarket wheel too. Edit: I found the TF15 model when I was browsing the big comp wheels on KTS catalogue as they had up to 139,7mm inducer option available
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miuge
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Post by miuge on Oct 18, 2018 15:41:50 GMT -5
You shouldn't have glued the carbon bottom of the tank, better to have an air gap between so the heat doesn't directly transfer on it. Put some reflective gold heat shield over the carbon and it will be good. If you're going to use a turbo blanket make sure it's got good reviews, the very cheapest ones have even caught on fire!!
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miuge
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Post by miuge on Jul 21, 2018 5:32:55 GMT -5
Has anyone used these diesel engine manifold flame heaters as an evaporator pre-heater for turbines? Around $35 shipped, 9.5V and 11V versions available. www.youtube.com/watch?v=NeDvCVS38hk
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miuge
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Post by miuge on Jun 25, 2018 10:39:57 GMT -5
Let's see if we could get this project started this year. I'll be ordering the HX82 turbine and billet comp wheel in few weeks when I'm coming back from vacation. Anders', Andy's and John's projects have been so motivating to watch that I have to get my own finally. Nowadays I've got a good chain of suppliers to make all the necessary bits needed; CNC machining, cutting, bending, ceramic coating and 3D printing. Would like to take a full advantage of them. Lately I'm interested in composite structures too and was thinking to make a comp cover and outer casing using carbonfiber. How about making a comp diffuser from carbon too? Just a thought.. The gas producer will be a "micro RC" -type, I've ditched ideas about turbo and turbo CHRA based builds already, and a bike frame will be built around it
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miuge
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Post by miuge on May 6, 2017 3:26:35 GMT -5
Hi Anders and Olov,
That's one interesting project for sure! Great fabrication level as always. I was thinking the same about the exhaust manifold, just flip the other entry 180degree around it's axis, I'd imagine it would work better providing more even and swirled flow.
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miuge
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Post by miuge on Mar 27, 2017 10:42:49 GMT -5
Hi John, Yes I remember that chart. I still think it wouldn't see past 100kph speeds too often so freepower would just spin rather low rpms I have a pair of gears ratio around 3.5:1, then I'd need a secondary gear (sprocket/chain) ratio around 5.5:1 to double the current freepower rpm. That could be achieved using a regular chain.
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miuge
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Post by miuge on Mar 26, 2017 16:36:13 GMT -5
Hi all, No updates here yet, just some borrowed parts for other past projects but now I've got them all back New powerturbine shaft isn't yet machined, but again I've been thinking of upgrading the bike before making any assembly. First I really would like to get better acceleration, top speed isn't that important with that frame and wheels combination. As seen from the S500 comp map, an intact turbo would work somewhat efficiently up to 60krpm and probably withstands even higher rpm temporary. Currently the freepower wheel would turn less than 20krpm at the speed of 150kph, which isn't much I think. John mentioned earlier in this topic that freepower would produce 80% of it's power at half of it's rpm. So maybe double or even triple the rpm?? I think I'd have a solution for reduction gear -Miuge
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miuge
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Post by miuge on Mar 17, 2017 16:49:00 GMT -5
Hi Anders,
I think it might work in both fuel and oil tank as you've already proven it does even cope high temperatures. I don't know what's the specification of the foam you're using, but here's directly copied FAQ from JAZ fuel cell site:
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miuge
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Posts: 199
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Post by miuge on Mar 5, 2017 4:47:18 GMT -5
Hi, Welcome Arto! That reminds me of one specific turboshaft bike I hope your build has the necessary upgrades for succesful results. Do you have pictures of your kerostart? I've got couple of diesel glow plugs I was planning to make a starter, but I've had absolutely no time for our bike recently...
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miuge
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Post by miuge on Feb 16, 2017 10:41:22 GMT -5
Johansson, you'll find my forever lasting build thread here: www.garaget.org/forum/viewtopic.php?id=269850Chris and John, fair enough, I do not want to make things too complicated I feel "pressure atomizer fuel injection" would require too expensive bits, pressure would be the main concern. I've been looking for small hydraulic pumps, but they require lot's of power and I'm not sure do they even work with diesel fuel viscosity. We have single nozzle injection in our turboshaft bike with EFI pump (max. 9bar), it probably had poor atomization related problems at lower pressures but works great after we raised idle speed. I'm still thinking I'll make this new one a reverse annular combustor style, easy to route oil in and out, longer combustor and whatever I decide with the fuel system, it'll be external easy to maintenance too. Mist of the "Racketjectors" looks pretty fine indeed, I'm confident it'll help to fix earlier fueling problems of the "FAT BOY"
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