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Author Topic: APS/Ω Gas turbine bike build  (Read 513779 times)
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Mobacken Racing
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« Reply #1635 on: April 04, 2017, 03:03:18 PM »

I did a test with the bike today but ran out of air in the scuba tank before I had figured out the idle throttle setting, I´ll give it another go once I have had the scuba tanks filled.



Cheers!
/Anders
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Mobacken Racing
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« Reply #1636 on: April 09, 2017, 12:56:13 PM »

I tried the bike again today with newly filled scuba tanks, but no go. The engine won´t increase in revs when the fuel is applied, it just sends billowing flames out the exhaust pipe.

After some consideration I measured the inner diameter of the syringe injectors, both the new ones and the ones I used before. Small wonder the engine didn´t run, the new green size syringes have an inner diameter of slightly over 0.5mm while the old ones was a snug 0.4mm ID. The flow areas are 0.23mm2 compared to 0.125mm2, in other words almost twice the flow area.

Looking at some syringe charts found with Google there seems to be some kind of confusion with the color markings, for example Black can be both 0.305mm OD and 0.7mm OD depending on where on what chart you look at...



I´ve just ordered a set of 0.7mm OD Black syringes which should be of the same size as the old ones that apparently worked just fine, they choked at around 2.5bar P2 but with water injection I think I should get some decent speed out of the bike anyway. Good thing I found this out now and not a week before the One Mile race. smiley

Cheers!
/Anders
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Mobacken Racing
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« Reply #1637 on: April 09, 2017, 03:03:16 PM »

A pic from before the test, I have some video as well but it is pretty much worthless since the bike didn´t start.



Engine removed from the bike and uncovered in 5 minutes.



15 minutes later it looked like this.



Now I just have to wait for the syringes to arrive... smiley

Cheers!
/Anders
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Mobacken Racing
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« Reply #1638 on: April 09, 2017, 03:38:08 PM »

With JU-01 taken out of the bike chassis I had the opportunity to test fit JU-02 to see if the feet are spaced apart properly and how close to the fuel tank the oil return fitting will sit. And of course to see what it will look like. smiley

Old JU-01 engine installed:



New JU-02 test fitted, it sure fills out the chassis better.



Oh yes. smiley



Other side:



To sum this up I can´t wait until I can install JU-02 in the bike and feel what 250+ gas turbine horses feels like! cool

Cheers!
/Anders
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Peter Jack
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« Reply #1639 on: April 09, 2017, 05:26:48 PM »

Awesome Anders!!!  cheers cheers cheers

Pete
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grumm441
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« Reply #1640 on: April 10, 2017, 04:18:42 AM »

Nice
It almost looks like there's room for both of them
G
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krusty
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« Reply #1641 on: April 10, 2017, 05:30:54 AM »

Don't go giving him ideas, Grumm!  grin

vic
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bbarn
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« Reply #1642 on: April 10, 2017, 07:15:38 AM »

Not vouching for these guys or their product, just passing along a quick google search. Maybe you can get more consistent materials from one of these guys (or someone else)?


http://fsgsbxg.com/1mmStainlessSteelTube/ss_4mm.htm
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I almost never wake up cranky, I usually just let her sleep in.
Mobacken Racing
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« Reply #1643 on: April 19, 2017, 03:04:02 PM »

A twin engine bike would be a sight to behold... Smiley

The syringe needles are on their way so I´ll try them first, it is really not that sensitive so as long as the flow is in the ball park and consistent between all 18 injectors it is good to go.

After a great Easter weekend with the family I managed to get some work done on the JU-02 test stand, I borrowed a magnet drill from work to drill bolt holes in the someday-to-be fan dyno stand.



Here the test stand is bolted in place.



I need to add a rear bracket but I can do that later, I drilled a bolt hole for it while I had the magnet drill at home.



Cheers!
/Anders
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Mobacken Racing
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« Reply #1644 on: April 21, 2017, 04:52:02 PM »

The new 0.7mm syringes arrived yesterday!



Needless to say Friday night was workshop night, here I am removing the old syringe injectors from the fuel plenum.



I am glad I have small hands and kept from drinking overly much coffee... Smiley



With all of the 18 injectors silver soldered and bent into shape I could test flow them with propane, all had the same flame height so they are good to go.



Before I called it a night I assembled most of the JU-01, so there is not much work left before I can do another test start! Smiley



Cheers!
/Anders
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WOODY@DDLLC
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« Reply #1645 on: April 21, 2017, 06:03:43 PM »

Anders, aren't the number of candles supposed to match your age?  shocked grin
Seriously - looking good - as usual!  cheers cheers
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All models are wrong, but some are useful! G.E. Box (1967) www.designdreams.biz
Seldom Seen Slim
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« Reply #1646 on: April 21, 2017, 06:17:23 PM »

And - you bent all 18 of those syringe/injectors from straight to the flared-over end -- free hand?

Unh, guys, I think we've found us a true magician. rolleyes
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Jon E. Wennerberg
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Mobacken Racing
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« Reply #1647 on: April 22, 2017, 01:06:04 AM »

Anders, aren't the number of candles supposed to match your age?  shocked grin
Seriously - looking good - as usual!  cheers cheers

Not far from, the main difference from when I was 18 is the amount of nose hair and how far I can Plymouth. grin

And - you bent all 18 of those syringe/injectors from straight to the flared-over end -- free hand?

Unh, guys, I think we've found us a true magician. rolleyes

The syringes are stiff as piano wire but if you heat them with the propane torch and quickly cool them down by blowing at them they become very easy to bend around a finger tip without folding.
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grumm441
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« Reply #1648 on: April 22, 2017, 05:11:40 AM »

The new 0.7mm syringes arrived yesterday!

I am glad I have small hands and kept from drinking overly much coffee... Smiley




Cheers!
/Anders

I know I've had enough coffee when I can thread the needle on a sewing machine, when it's running
G
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Chief Motorcycle Steward Dry Lakes Racers Australia Inc
Wazavudu Bellytank  Spirit of Sunshine Bellytank
Mobacken Racing
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« Reply #1649 on: April 24, 2017, 02:28:46 PM »

Hi guys!

I ran the bike tonight with good results, the engine started and ran up to idle with seemingly lower exhaust temps than before.



I say seemingly since I didn´t have a chance to check it over a longer period of time, the home designed PWM controller for the fuel pump had an undersized transistor with an overload safely feature that cut the pump voltage as soon as the fuel pressure started to rise.

Olov helped me find the problem over the phone so I am very satisfied with todays run, it is great to be able to sort these issues out this early in the season!

Now it is time to hit the sofa for an episode of "Land Speed Heroes". Smiley

Cheers!
/Anders
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