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Author Topic: APS/Ω Gas turbine bike build  (Read 394405 times)
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Mobacken Racing
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« Reply #1260 on: March 21, 2016, 06:06:08 PM »

Thanks to a hint from PorkPie I have reconsidered the ejector style oil tank vent, the risk of setting the oil smoke on fire and on top of that risk pulling oil up through the hose with the under pressure created I decided to make a separate ventilation instead. I spent a couple of hours in the workshop building a catch tank for the oil tank vent tonight.



Since my foot will be on the footpeg there isn´t room for a larger volume catch tank but I think this will do, a nice big breather filter on top will let any air trapped in the oil tank out quickly.



As soon as the weather improves and I find a couple of hours of spare time I will roll the bike out for a test start!

Cheers!
/Anders
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WhizzbangK.C.
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« Reply #1261 on: March 21, 2016, 08:57:44 PM »

Thanks to a hint from PorkPie I have reconsidered the ejector style oil tank vent, the risk of setting the oil smoke on fire and on top of that risk pulling oil up through the hose with the under pressure created I decided to make a separate ventilation instead. I spent a couple of hours in the workshop building a catch tank for the oil tank vent tonight.



Since my foot will be on the footpeg there isn´t room for a larger volume catch tank but I think this will do, a nice big breather filter on top will let any air trapped in the oil tank out quickly.



As soon as the weather improves and I find a couple of hours of spare time I will roll the bike out for a test start!

Cheers!
/Anders

Did you fill that catch tank with stainless steel wool? Something like is found in the kitchen aisle of the grocery store for scrubbing pots and pans. It really helps separate the oil mist from the air if you start to get any kind of flow through it.
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Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of.  Douglas Adams
Mobacken Racing
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« Reply #1262 on: March 21, 2016, 11:48:00 PM »

Did you fill that catch tank with stainless steel wool? Something like is found in the kitchen aisle of the grocery store for scrubbing pots and pans. It really helps separate the oil mist from the air if you start to get any kind of flow through it.

That is a great idea, the hole on top is large enough to push a rolled up steel wool sheet through. Thanks! smiley
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wobblywalrus
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« Reply #1263 on: March 22, 2016, 12:22:16 AM »

This might be the type of scouring pad that Ed is mentioning.

The scouring pad is in an oil/air separator which is on a larger diameter hose above the engine.  Liquid that drips out of the pad trickles down the hose and back into the engine.  Otherwise, the pad fills up with oil and water.  The air goes up through a hose to the catch tank.  It has a drain and a sight glass.  The hose ends in a little filter above and to the side of the back wheel.

Do not be surprised if it takes some trial and error to get the system working. 


* 2016 Builld 234.JPG (107.19 KB, 575x480 - viewed 125 times.)

* 2016 Build 235.JPG (119.56 KB, 674x768 - viewed 101 times.)

* 2016 Build 236.JPG (144.99 KB, 721x768 - viewed 104 times.)
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WhizzbangK.C.
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« Reply #1264 on: March 22, 2016, 12:24:48 AM »

Did you fill that catch tank with stainless steel wool? Something like is found in the kitchen aisle of the grocery store for scrubbing pots and pans. It really helps separate the oil mist from the air if you start to get any kind of flow through it.

That is a great idea, the hole on top is large enough to push a rolled up steel wool sheet through. Thanks! smiley

Make sure you use stainless. The courser, the better. The vented gases can contain a lot of water, as well as drawing in damp outside air when it cools off or as weather changes. Regular steel wool will disintegrate into rust in no time if moisture hits it.
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Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of.  Douglas Adams
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« Reply #1265 on: March 22, 2016, 12:27:05 AM »

This might be the type of scouring pad that Ed is mentioning.

The scouring pad is in an oil/air separator which is on a larger diameter hose above the engine.  Liquid that drips out of the pad trickles down the hose and back into the engine.  Otherwise, the pad fills up with oil and water.  The air goes up through a hose to the catch tank.  It has a drain and a sight glass.  The hose ends in a little filter above and to the side of the back wheel.

Do not be surprised if it takes some trial and error to get the system working. 

That's exactly what I'm talking about Bo. It works better than anything else I've ever tried, and I've built a few of this type breather in the past.  smiley
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Ah, this is obviously some strange usage of the word 'safe' that I wasn't previously aware of.  Douglas Adams
Mobacken Racing
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« Reply #1266 on: March 22, 2016, 05:26:41 AM »

My vent will have a very easy life compared to a crank case vent for a piston engine, no sudden rushes of oil misty air just a slow and steady air leakage from the engine that reach the oil tank through the bearing system.
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Mobacken Racing
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« Reply #1267 on: March 23, 2016, 04:49:39 PM »

Since the winter won´t go anywhere anytime soon I figured it would be best if I can do the test run with the bike still on the workshop floor, but the angle of the jet exhausts would send papers and stuff flying all over the workshop so I had to come up with some way of directing the exhaust more rearwards.

I got around to make a pair of jet pipe extensions today, nothing fancy but they´ll hopefully do the trick.



The exhaust end is possibly a bit narrow but in order to direct the jet flow rearwards enough I couldn´t make it any more open than this. It´ll work just fine at the high idle run I am planning to do. smiley



Cheers!
/Anders
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Speed Limit 1000
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« Reply #1268 on: March 23, 2016, 08:28:41 PM »

BAD A$$ pipes cheers That will make a good street bike shocked
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John Gowetski, red hat @ 221.183 MPH MSA Lakester, Bockscar #1000 60 ci normally aspirated w/N20
wobblywalrus
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« Reply #1269 on: March 24, 2016, 11:38:44 PM »

This is an American company so their products might not be obtainable.  There is lots of useful info on their website that might be a help.  www.freemansupply.com 
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Mobacken Racing
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« Reply #1270 on: March 29, 2016, 03:18:15 PM »

Thanks wobblywalrus for the link!

I ran the bike today to test the modifications I´ve done during the winter, both tachometers work which is great. I just need to calibrate them a little, the gas producer is hopefully not even near the displayed 200.000rpm..... smiley



Cheers!
/Anders
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Glen
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« Reply #1271 on: March 29, 2016, 07:23:19 PM »

Love it, sounds great. go fast. grin
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Glen
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Mobacken Racing
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« Reply #1272 on: April 01, 2016, 02:19:00 PM »

Jon sent me a pic of Nancy posing with the tshirt I sent her, she is without a doubt the prettiest wearer of our Mobacken race wear. (sorry Olov... smiley )



And from the other side of the planet came a photo of another tshirt wearer, my very good friend and gas turbine mentor John Wallis. Here standing next to his newest gas turbine engine ready for its first fire up on the test stand.



Cheers!
/Anders
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Frank06
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« Reply #1273 on: April 01, 2016, 08:10:16 PM »

Sounds tough!  This will be a good year...
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Mobacken Racing
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« Reply #1274 on: April 01, 2016, 11:40:26 PM »

Sounds tough!  This will be a good year...

I sure hope so, this weekend I will try to get the tacho sorted out and as soon as the back yard is ice free I will take the bike outdoors for another test run at higher revs.

After watching a handful of previous test videos I noticed that the engine has a temperature spike between 0.8-1.0 bar boost pressure (P2), so I will push the engine over that region to find out of the temp drops a bit. Nothing to be concerned of in that case since I will be running the engine between 2-2.5bar while racing the bike. smiley



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