Author Topic: Fuel Injection Systems Part 2  (Read 7764 times)

Offline Roger B

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Re: Fuel Injection Systems Part 2
« Reply #90 on: January 21, 2023, 03:44:54 PM »
Thank you  :)   A sharp insert, high speed (2800rpm) and shallow cuts (0.05mm).

I assembled it and tested it without the needle spring. The 0.35mm hole gave a nice jet but no atomisation.

<a href="https://www.youtube.com/watch?v=JAZUb5ams2E" target="_blank">http://www.youtube.com/watch?v=JAZUb5ams2E</a>

When I applied pressure to the needle there was a significant leak from the nozzle fixing thread. I decide to reduce the size of the anulus on the nozzle to increase the clamping pressure and to recut the seating in the body. This worked but I then had a leak from the fuel inlet union. After some inspection and thought I realised I had cut the seat 90 not 60   :toilet_claw:   This was easily fixed.

The final step was to cut the needle to length and assemble it with the spring and spring cap from an existing injector.
The spray pattern is somewhat offset, probably due to a lack of concentricity between the nozzle and the needle. The atomisation looks good and the opening pressure is adjustable in the correct range.

<a href="https://www.youtube.com/watch?v=hv5i8zO_tx8" target="_blank">http://www.youtube.com/watch?v=hv5i8zO_tx8</a>

<a href="https://www.youtube.com/watch?v=pQytbUvBtBE" target="_blank">http://www.youtube.com/watch?v=pQytbUvBtBE</a>

Finally everything that had been in contact with the diamond paste went in the ultrasonic bath
Best regards

Roger

Online Kim

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Re: Fuel Injection Systems Part 2
« Reply #91 on: January 21, 2023, 05:58:17 PM »
Incredibly small and meticulous work, Roger!  I find it just amazing!  :popcorn:

Kim

Offline jcge

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Re: Fuel Injection Systems Part 2
« Reply #92 on: January 21, 2023, 10:24:17 PM »
Roger - that is looking great !
Whilst the spray pattern may not be as concentric as you'd like, there appears to be good atomisation of the fuel stream.
And the video of the 0.35mm nozzle stream looks viable for non diesel manifold injection as well
Bravo !
Regards
John

 

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