Calculating top speed on ice...

[metiz]

Good shit

I'm on track for testing the new m40 mods to - first one to give up trying to start their engine is a rotten egg!

[nickwilson]

Nice,I like it, How much thrust? Is it called the V-1. I am very interested in this one,Also is your roller just two pipes bolted together

[Johansson]

Nice,I like it, How much thrust? Is it called the V-1. I am very interested in this one,Also is your roller just two pipes bolted together

Thanks! 33kg estimated. No. Great. Yup.

[metiz]

Thanks! 33kg estimated. No. Great. Yup.

Sounds like an average phonecall to me

[Johansson]

Well, short questions calls for short answers.

I will try to do a test run on sunday, wish me luck!

[Johansson]

I ran the engine today and it works great! No video unfortunately since the camera man hadn´t arrived before disaster struck.

Well not exactly a disaster, the coil got so hot that the hard soldered injector came loose and was not found until I was about to go home. I crimped the copper tube end as some crude injector but it didn´t work well at all, the battery was also running out of juice since I couldn´t get the fuel pressure above 2 bar when it had been close to 6 bar during the first tests.

Now I just have to make an injector tube from steel instead of copper so it won´t come loose again.

A great sundag morning indeed! =)

[metiz]

Good to hear the engine works alright. But we're going to need a video and we kinda need it now so if you could just get out there and do that for us then that'd be fantastic

[Johansson]

It was a shame that I didn´t get me a camera man before I started her up, but my thought was to run the dust out of her and await the rest of the guys and do a longer run with the injector perfectly positioned.

Didn´t know by then that the injector would drop off.

You should get a better video of your own engine before you start pestering me about it!

[metiz]

You realise I was pulling your leg right?

But you're right about that vid. I'll try next week and get a good liquid run in

[Viv]

Hi Anders

I am backing Metiz to force you to redo the run for a video

The good thing is you now know how hot your injector got during the run if you look up the temperature to melt your solder

Viv

[Johansson]

Metiz: Oh yes, I knew you were joking.

But a video will come the next time as promised, as much for myself as for you guys since I get some sort of mental blackout when running an engine for the first times. Time and common sense disappears so my idea of what happened during the run and what really happened can be two completely different storys...

[Eric]

You are using copper injection tubes right?

Crank your tig up to high amperage, and just tack fuse the copper tube in 3 spots, so it has some structural strength under the solder, or if you get good you should be able to fuse it all the way around without melting it. Copper is a bitch to weld though, it transmits the heat all over so the whole part is almost at melting temp before a puddle starts to form. It can be done though. I've done a lot of tig welding of copper knife fittings and decorative stuff.

[Johansson]

The problem was that I used a steel injector and a copper fuel pipe, the copper tube was used as a crude way to adjust the injector depth.

I have bought parts to build a much better injector fitting in steel tubing now, I will flare the end of the copper preheat coil coming out of the CC and from there it will be steel all the way to the injector. I used ferrules (right word?) on the copper tube during the last run but the tube got annealed from the heat and started to leak.

I have tried to tigweld copper earlier and it is a bit tricky as you say, but it looks really nice when it is finished compared to a soldered part.

[Johansson]

I made a new injector holder today, the next test will show how it works.

[Johansson]

Here comes the video as promised, we ran it again today and even though the fuel system needs some tweaking it shows potential.

I am amazed how easy the engine starts with the vapour coil, I use the propane preheater for a minute to get the coil temp up and then shut it off, hit the ignition and start the fuel pump. Even if the engine hasn´t been running for several minutes I still don´t have to preheat the coil, I just hit the fuel pump and it starts right off.

I took a trip around the parking lot and even without the augmentor and with less than full throttle it started to pick up speed quite fast, the battery was not fully charged so the flameout at the end is caused by a drop in fuel pressure.

http://www.youtube.com/watch?v=1XKGwwaaiDs

Some more injector tweaking and it should really scream, even now it shook lots of snow from the roof of the nearby shed.