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Post by Johansson on Sept 5, 2017 14:04:07 GMT -5
Hi Anders Even at your current P2 the JU-02 should be supplying ~20% more air just from the larger inducer area , but that will increase another 10% or so with the higher P2s , so just from airflow alone theres ~30% increase , but the higher P2s will increase the pressures going into the freepower resulting in higher gas speeds and deflection , so more percentages of increase :-) Your current gearing will be fine for a bit longer . I'd be seriously thinking about a "bypass" at the interstage if you find the temps are too high at low speeds . Cheers John This sounds absolutely great, I´ll do some more tests at higher P2 just to see that it won´t start behaving strange and get the electric starter fitted. Then I will start installing it in the bike and build the interstage section with the C20 NGV instead of the home made one. I haven´t really decided yet if I will weld the C20 NGV to the interstage or clamp it somehow, welding is easier by far but might induce cracks later on. I´ll consider a bypass if the JU-02 starts to heat up at low speeds when the freepower is installed. Hi Anders A thought ..............lets assume your ITT is reading correctly , say ~1100 deg C - 1373 K instead of ~750 C - 1023K , 1373/1023 = 1.34 , your gases will be 34% less dense than they should be , that will restrict/lower the mass flow through a choked gasifier NGV or whatever downstream , the gas velocities will be higher and might knock off say 20% of the "losses" , but overall you'll probably have less power than if running the cooler temps with greater mass flow ..................your "Corrected Flow" drops off with excessive temps . Could there be a "restriction" downstream of the gas producer that is causing the excessive temps , the freepower wheel doesn't seem to make much difference whether stationary or spinning at high rpm , the only other possibility is the freepower NGV or exhaust duct which may need to be more "aerodynamic" Cheers John There might very well be a restriction downstream JU-01, last year I had to weld several cracks in the freepower NGV so of one or several of the vane welds have cracked again they might have bent and partially blocked the NGV. We´ll soon find out, I will remove the engine from the bike as soon as I get back home from hunting a couple of weeks from now. Cheers! /Anders |
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Post by Johansson on Sept 4, 2017 13:48:41 GMT -5
Hi Anders A top 10 finisher :-) I've enjoyed your ride a dozen times , LOL...keep going back for just one more . Acceleration times were very good for a single speed gearbox , 0 to 100 kph in ~4 seconds , only another 3 secs to 150 , so a tad over 7 secs for zero to 100 MPH , not bad ................. acceleration still fairly consistent with only another 4 secs from 150 to 200 kph and only 5 secs more to 250 , still pulling strong , then as your terminal velocity was approaching she slowed down taking another 9 secs for the 250 to 300 ...............looks like gearing was just about spot on . But those temperatures are still a "mystery" to me ............its a wonder theres any blades left on either the gas producer or freepower wheels , T I Ts would have had to be ~1,250 deg C :-( A bit of a glow for the interstage duct would be OK , if ~900 C for a T I T , say 750 C interstage , this would give some "colour" and certainly leave the freepower with a nice red glow at the end of a run if ~600 C for the exhaust temp. Looking forward to seeing what she looks like inside . Cheers John Actually the bike was geared to reach 30.000 freepower rpm at around 330-340km/h so it was a bit tall just to play on the safe side. I´d rather start at that end and increase the freepower revs once I have bottomed out JU-02, the one thing I don´t want to experience is a gearbox failure at 300++km/h... The exhaust temps are a true mystery, I´ve changed both temp gauges and locations numerous times over the years and I still get impossibly high temp readings. It doesen´t really matter now, JU-02 shows much more reasonable temps. After some kind of drunken havoc at the after One Mile party (I wasn´t there so I don´t know what happened) the arrangers have decided that there won´t be a race next year, very sad but there are more races around Scandinavia so I can still run the bike even if I have to travel a bit longer. Since JU-02 ran perfectly up to 2 bar P2 I am thinking that if the engine keep the temps reasonable up to full RPM I will end the tests and focus on getting the engine installed in the bike so I can have the bike ready by next summer. Knowing how the JU-01 engine performed at only 2.3-2.4bar, how hard do you think that I need to run JU-02 to get the same kind of speeds out of the bike? Congrats, Anders! What a run! Thanks! Nice Anders you got it, Im very happy for you! Thank you Sven! Hi Anders, When you get the JU-02 installed put the bike on a dyno. It would be awesome to see how the JU-02 produces its power curve. I am not sure any dyno owner would like to test a turbine bike, it isn´t easy to get the exhaust jet out of the dyno room. Just ask Andrew (jettoymaker)... Hi Anders, Congrats on the successful run. As far as the material of the compressor wheel is concerned, I don't think it is any better material than just a milled out piece from solid aluminium. Cheers. Titanium is a lot better.  |
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Post by Johansson on Sept 3, 2017 16:26:24 GMT -5
The results just came out, I laughed loud when I saw that I outran the 1500hp Dodge Viper... :-D  Cheers! /Anders |
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Post by Johansson on Sept 3, 2017 16:04:05 GMT -5
Congratulations Anders on another wonderful run! That looked and sounded amazing! Chris Thank you Chris! |
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Post by Johansson on Sept 3, 2017 5:16:33 GMT -5
That sounds perfect John, I think we´ve discussed this before but my memory fails me from time to time. Tony, I would just love to see the tech inspector faces when I tell them what you just said... Here is a riders view of the 306km/h run, temps are mad and P2 is too low since the injectors are bottomed out. Still a decent run. Cheers! /Anders |
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Post by Johansson on Sept 2, 2017 17:50:39 GMT -5
Hi Anders What a sweet sound at full power and speed, love it :-) Cheers John I can´t stop thinking about what JU-02 will sound like at 5bar P2... One thing I´ve been thinking about while driving home tonight concerns the JU-02 installation in the bike. Will the C20 turbine wheel be the restricting part in the drive train or will it cope with the flow? If a C30 wheel is better even by a hairs width I will fit one of those instead now that I have the chance, there is no cutting corners at this point in my opinion. I need to extract every single bit of power from the JU-02 to get a fair chance to beat the electric bikes in my class. Cheers! /Anders |
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Post by Johansson on Sept 2, 2017 17:13:18 GMT -5
Thanks a lot! The day couldn´t have been any better, awesome weather, awesome runs by many racers (one finnish guy ran 402km/h with his turbo-Hayabusa!) and the bike performed although it sang on its last verse.  First off I ran a 295km/h run with a crappy start, so we decided to try again to get past 300km/h without water injection. The injectors bottoms out at 2.4bar so I am a bit short on fuel but the second start is great and the front wheel feels like it is lifting from the track when I take off. Unfortunately the oil is heating up and the pump can´t keep the pressure over the 3kg that the safety pressure switch is set at so the fuel pump shuts down and aborts the run.  After some consideration I decide to lower the switch pressure to 2kg just to get another run out of the engine, it runs crazy hot and I knew it wouldn´t survive the weekend so I didn´t care that the thrust bearing might get toasted by this. At the last moment I also decided to run the water injection since I hoped it would lower the temps a tad.  I got off by yet another crappy start since the high flow of water spray made the engine flutter at low P2´s, so I let the brakes go and crammed the trottle as soon as I got off the starting line. The bike ran perfectly all through the run (although at just 2.4bar P2) but it was white glowing hot when I stopped... Now I´ll finish off my glass of scotch and go to bed, been up since 04.00 this morning so I am a bit tired.  Cheers! /Anders |
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Post by Johansson on Sept 2, 2017 12:48:08 GMT -5
306km/h today. 😁
Video and race report will be made as soon as I get back home
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Post by Johansson on Sept 1, 2017 10:01:15 GMT -5
Anders, If you will be approaching 200 MPH... with no rear suspension... **Please make every possible effort to stay safe.** Your safety is more important to your family and everyone here than any land speed record. After you finish... call it quits. You can only take extreme risks so many times before something happens. 200 MPH is really, R E A L L Y scary fast. MY PRAYERS ARE WITH YOU. GOOD LUCK! Tony I appreciate your concern Tony but sub-200mph is nowhere near as fast as I want to run the bike, so I think I´ll be at it a while longer. With the JU-02 engine tuned in and some considerable effort made on the bike aerodynamics I hope to see speeds up to 220-230mph at a full length racetrack. I don´t really care about any record, I just want to run the bike as fast as it can possibly go with a DIY gas turbine. Cheers! /Anders |
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Post by Johansson on Aug 31, 2017 23:15:31 GMT -5
Hi Anders LOL, I'll feel proud no matter what speeds you do , just seeing one of our home made engines doing its thing is exciting to me :-) Cheers John It is quite a feeling to outrun most of the top notch sport bikes with a bent together pile of CrMo pipes and an engine made out of chunks of alloy and mild steel in the shed. I simply cannot wait until JU-02 is installed so I can start chasing the turbo bikes. Hi Anders, I know you have figured out the right way for doing water injection into the engine. Just sharing this FYI. These pics are of a big ABB Turbocharger from a Natural gas engine that i took apart yesterday. They show the port being used for water injection. The ID of the port was atleast 5mm. Cheers. So they simply used a venturi port for water injection? Then my spray nozzle is really high tech, I was worried that I would have to use multiple smaller ones to get the droplet size down to avoid damage to the compressor leading edges. (The ABB compressor might be made out of a better material than cast aluminum but still...) |
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Post by Johansson on Aug 31, 2017 13:12:50 GMT -5
Good to hear John, then I won´t have to be afraid of bottoming out the water injector! Thanks guys, I´ll try my best to make you proud. |
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Post by Johansson on Aug 30, 2017 23:07:25 GMT -5
Hi Anders You should be able to pump a fair bit of injection fluid into the engine , the Allison 250 pumps >1 gallon - 4 litres per minute of 2 parts water 1 part methanol , so you shouldn't have problems with at least 2 litres/min ..................I was pumping ~1.5 lpm of water into my TV84 engine , your airflow is ~1/3rd more . The Swedish weather is looking reasonable over the weekend , so you should get some good runs in :-) Stay safe and enjoy yourself . Cheers John Hi John, That much? Ok, good to know if there is time for a follow up run. Then I´ll try my best do drown it and see if that improves top speed. Did you just say "reasonable"?? If the forecast is correct the next weekend will be the hottest one in all summer, 16-17°C and no rain for two days is crazy hot compared to the 12-13°C windy days with the occational drops of rain we´ve had all summer. I forced myself to take a bath one day during vacation and it took hours for my balls to want to show themselves again... Thanks! /Anders |
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Post by Johansson on Aug 30, 2017 6:41:38 GMT -5
Only a few days left now before One Mile, I am currently sorting out what I need to bring and getting my head around the upcoming runs. The plan is to do a full throttle run without water injection first and see how the winter mods will affect the performance, hopefully I´ll do a 300+ km/h run. After that I will activate the water injection and if it seems to work when testing it in the pits (I have never tried the water injection) I will do a second run with as much water as I dare and see how it goes. I hope to gain some HP with water so if the engine runs fine I might be able to up the top speed 10-15km/h with it. If so I am getting very close to the 200mph mark so if there is time left I can work on launching the bike at higher boost to get the speeds up faster. Fun fun fun! Wish me luck! Cheers! /Anders |
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Post by Johansson on Aug 30, 2017 2:32:48 GMT -5
I run AN6 for my oil line, works just fine. Just think of how small the total oil channel area inside the turbo is, there is no need to go to the extremes.
Just make sure you have the oil pressure sensor between filter and turbo so you are reading the pressure the turbo is getting and not what the pump is supplying, a clogged filter or any other restriction in the oil system won´t be spotted otherwise before the bearings wear out.
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Post by Johansson on Aug 29, 2017 13:23:33 GMT -5
I´d place it between the pump and the turbo rather than having it between tank and pump since the oil pump is much better at pushing oil than sucking it.
Or even better have a separate cooler pump that circulates oil from the tank through a cooler and back to the tank. It´d complicate the plumbing a bit though.
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