Landspeed bike with DIY gas turbine

[gidge348]

Fair enough, just a thought.

As long as the dowels hold when hot that all you need..... agree.... KISS principal.

[Johansson]

Exactly, the fewer the parts the less chance of one breaking.

[Johansson]

While waiting for some parts to arrive I made up a list of things to do before the engine can be reassembled, you can probably not read it but it says rebuild the oil return, fit new Hobbs oil pressure switch, true the compressor spacer, make new piston ring seal housing and send the rotor away for rebalancing.



My friend Lars-E (one of the V1 pulsejet sled guys) offered to true the comp spacer in his grinder at work, it lost a little shape from the heat when the piston ring seal got destroyed so it needs some work.



Tonight I have been making parts for a new and improved oil scavenge line, the old one was made out of hydraulic tubes with metric threads cut so deep that I constantly worried that they would snap when the external AN-connections were torqued in place. The new steel ones have UNF threads that aren´t nearly as deep as the metric threads, I´ve also added a flange on the inside so they can be torqued without stressing the connection tubes.



Here I have just cut the old tubes to fit the new steel ones, a look at the workshop clock told me that time had rushed by so I had to call it a night. When I got back inside and happened to look at the kitchen clock I realized that the workshop clock was still running on summer time and therefore an hour ahead. Damnit!

Cheers!
/Anders

[racket]

Hi Anders

LOL........bloody "daylight saving time" we have the same problems here in Oz whenever we change over .

Nice short jobs list .............must be feeling good :-)

Cheers
John

[Johansson]

Hi John,

Nice and short for a change, and after tonight it has two less jobs on it.



First of the two scavenge tubes mocked up.



And here they are welded in place!



With the scavenge line finished I modified four M10 stainless insex bolts in the lathe, they will be used to bolt the diffusor housing to the shaft tunnel instead of the abused 12.9 bolts I´ve used earlier.



Last week I got the Hobbs adjustable pressure switches I ordered.



Here one of them is fitted to the oil filter holder, now I can set it so that the fuel pump shuts off below 3 kg oil pressure. It will spare the bearings compared to earlier when I had a 0.2 kg standard automotive oil pressure switch.



Cheers!
/Anders

[racket]

Hi Anders

Love those Hobbs switches :-)

They give you that extra bit of security and peace of mind knowing they'll cut the fuel pump off nice and quickly if theres a lube problem whilst you're busy riding the bike .

Yeh, keep working on that job list , it ain't far to go now to finish them off ..................LOL, but if you're like me , you'll probably keep finding something that could be "massaged" a bit to improve its looks or performance ;-)

Cheers
John

[gidge348]

Nov 4, 2013 17:01:06 GMT -5 Johansson said:

Hey Anders.....

I can see the use for the Hobbs switches, Coffee and even the toy bike.... But the hair brush..... come on now you have the amount of hair as I have...... grass doesn't grow on a busy street LOL

[ernie wrenn]

I thought that was a oil sample... That is STRONG coffee. That might be the toothbrush after the coffee.

[Johansson]

I comb my ass every morning you see.

Ernie, this is swedish style coffee and not the watered out donkey piss you drink over there in the states.

[Johansson]

My friend Lars-E offered to grind the compressor spacer flat since it got a bit distorted from the heat when the piston ring seal rubbed its housing, he emailed these pics last night to show that he was finished.



Here is the finished spacer with measurement protocols before and after the grinding, as you can see the spacer was out well over one hundredths of a mm and close to the shaft centre it would bend the shaft badly.



I removed the piston ring marks from the piston ring housing in the lathe and found that it can be used again, great news!



All I am waiting for right now is the bearing kits I´ve ordered. When I get them I can assemble the entire turbine shaft, mark every part up for alignment and send it away for balancing!



Cheers!
/Anders

[Johansson]

Not much have happened on the bike during the last weeks, lots of work away from home and a pair of beer trips as well has stolen all workshop time from me. Space is even more cramped now since I brought my "daily driver" Triumph bobber in from the cold to get the tank welded and exhaust pipes modified a bit.



Tonight I felt I had to do something while waiting for the rotary parts to arrive from balancing, I took two JIC 9/16" steel couplings and made the scavenge line couplings from them.



Here they are fitted, way better and tighter fit than with the old couplings so this will work great!



I mailed the newly grinded compressor spacer to the balancing company today, unfortunately the bearing kits they ordered for me didn´t contain all the parts needed so it will take some time before they get the new sets and can balance the complete rotor.

Cheers!
/Anders

[racket]

Hi Anders

LOL..............not like you to be scatching for a job to do ;-)

Cheers
John

[gidge348]

That's a cool looking Trumpy bobber I guess you are a all ice & snow at the moment?

Where did you have to do the beer run to...... Estonia? I know there can be big differences in prices across Europe.

Ian...

[Johansson]

No, but I have had lots of other stuff to do lately so the timing with the missing turbine shaft was actually quite good.

No snow yet but a few degrees below freezing so bike season is over for this year, just as well since there are five hours of work for every hour of driving old brit bikes...

No beer run in that way, we rented a cabin in Åre and enjoyed ourselves for a couple of days with beer, grog and, well, more grog.

[Johansson]

While waiting for the turbine shaft to come back from balancing I figured I could fix the throttle arrangement, the manual needle valve throttle I made didn´t flow enough fuel so I had to use a PWM controller for the fuel pump. Up until now I have had a PWM controller zip tied to the handlebar but it would be impossible to adjust the tiny knob while riding...



A friend of mine has a spare part Mercedes that I could scavenge the throttle position sensor from, it is basically a potentiometer so I figured I could use it to control a PWM module. Testing it on a fuel pump confirmed this so I fitted it to the air box and started making the throttle wire mount.



That went well, I used a long bolt as an adjustable throttle stop so I can set the max throttle setting manually. Idle is adjusted on the wire tension screw.



Cheers!
/Anders