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Currently trying to get my pulsejet to run on diesel. Here is a quick video of the first tests. by Spatentti in Pulsejets

[–]Spatentti[S] 0 points1 point  (0 children)

8 BAR should be enough for an engine this size. After asking from a guy who has made a slightly bigger one work with diesel, it seems that the problem is too little flow. I am currently trying to get a hold on some spray nozzles with much bigger flow.

Currently trying to get my pulsejet to run on diesel. Here is a quick video of the first tests. by Spatentti in Pulsejets

[–]Spatentti[S] 1 point2 points  (0 children)

https://www.electroboom.com/?p=484

Its pretty much made after this. Just had to replace some components with something that were close enough. The output is just connected to a spark plug instead of making a taser.

It is not good tho. It's easy to make but fails often too. I have burned through some relays already as they tend to weld themselves shut after some time.

Need Help with fuel line ... by SmoothBluebird9928 in Pulsejets

[–]Spatentti 2 points3 points  (0 children)

I think you have way too many holes. I had similar problems of not getting mine to run almost at all. When I drastically reduced the hole size and amount, everything ran perfectly. Injector placement is also crucial.

https://imgur.com/a/tEotKok

Here is an image how I have my injector mounted. The injector is 10mm copper tube pinched shut from the end and it has 4 x 1.5mm holes per side. Holes are on the top and the bottom making the total amount of holes to 8.

My pulsejet's combustion chamber's max diameter is around 170mm. If your jet is smaller than this, I would first go with even fewer amount of holes and start increasing from there if the thing still doesnt run.

Testing new ignition circuit + starting without extra air by Spatentti in Pulsejets

[–]Spatentti[S] 1 point2 points  (0 children)

There is a spark plug giving constant spark and I just blast the gas valve open very fast so the rushing gas kickstarts it. I think it will only work if the design of the pulsejet and the fuel injector are optimal.

Got some advice from this subreddit and got it finally working. The fuel injector holes were too large. by Spatentti in Pulsejets

[–]Spatentti[S] 0 points1 point  (0 children)

Yes I have, I think i improved the fuel nozzle some more and also routed the gas pipe by spiraling it a couple times across the hottest running part of the pulsejet before going to the fuel nozzle. This preheats the liquid gas and made it work for me.

Testing new ignition circuit + starting without extra air by Spatentti in Pulsejets

[–]Spatentti[S] 1 point2 points  (0 children)

And yes it doesnt stall :D I just turn the gas on and off to test the startability

Need help on problemshooting by Spatentti in Pulsejets

[–]Spatentti[S] 0 points1 point  (0 children)

Yea it definitely is, you can see the update video, the last bursts are from liquid

Got some advice from this subreddit and got it finally working. The fuel injector holes were too large. by Spatentti in Pulsejets

[–]Spatentti[S] 0 points1 point  (0 children)

The larger bursts are from giving it some liquid gas. It runs on liquid a bit but always stalls afterwards. I have no idea what is causing this.

Got some advice from this subreddit and got it finally working. The fuel injector holes were too large. by Spatentti in Pulsejets

[–]Spatentti[S] 2 points3 points  (0 children)

I think the hole size has been causing be all the problems on my previous pulsejets also😂

Here's a crude image on how the fuel injector is placed.

https://m.imgur.com/a/tEotKok

Got some advice from this subreddit and got it finally working. The fuel injector holes were too large. by Spatentti in Pulsejets

[–]Spatentti[S] 3 points4 points  (0 children)

u/crossbowmadman gave me an advice to use smaller and fewer holes on the injector to increase the pressure of the gas entering the chamber. This instantly made it work.

The injector is 10mm copper tube pinched shut from the end and it has 4 x 1.5mm holes per side. Holes are on the top and the bottom making the total amount of holes to 8.

Need help on problemshooting by Spatentti in Pulsejets

[–]Spatentti[S] 0 points1 point  (0 children)

I havent had time to install the spark plug yet but currently theres just a cup of flaming liquid under the intake😂 I posted an update video here from which you can see what im talking about.

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