Author Topic: Fuel injection systems  (Read 84103 times)

Offline Roger B

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Re: Fuel injection systems
« Reply #390 on: October 31, 2021, 05:43:14 PM »
The two cylinder engine ran better with the improved delivery valve so I had a look at the horizontal engine. There was a fuel leak past the delivery valve with only 0.8 bar from the fuel feed pump.


I removed and dismantled the pump. There was a significant amount of rusty clag in the inlet port and delivery valve, probably due to the high moisture content of the cooking alcohol I used to use for trials. After lapping the delivery valve seat I cleaned it all in the ultrasonic bath and reassembled, replacing the delivery valve spring as there were signs of corrosion  ::)
Best regards

Roger

Offline Roger B

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Re: Fuel injection systems
« Reply #391 on: October 31, 2021, 08:06:26 PM »
Seems to run well  :) 1000-4000 rpm

Best regards

Roger

Offline Kim

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Re: Fuel injection systems
« Reply #392 on: October 31, 2021, 08:44:45 PM »
Wow!  I'll say!  That runs GREAT, Roger!   :ThumbsUp: :popcorn:

You have a daunting number of experiments, time, and effort into this!  What's your next step?  Are you satisfied?  Or is this still just one more step in your road toward perfection? :)

Kim

Offline 90LX_Notch

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Re: Fuel injection systems
« Reply #393 on: October 31, 2021, 09:57:47 PM »
Outstanding.  Congratulations Roger, this has been such an impressive project.  It runs beautifully.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline Admiral_dk

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Re: Fuel injection systems
« Reply #394 on: October 31, 2021, 10:10:17 PM »
So now you have two engines running great with your system   :praise2:   :praise2:

I was almost thinking that you really had it all nailed until I realized that this is also running on petrol right now ....

Are all the rack bits for the diesel injector ?

Offline Roger B

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Re: Fuel injection systems
« Reply #395 on: November 02, 2021, 05:29:31 PM »
Thank you all for your support  :)  :)

I don't think I can do much more with this version of this engine. The throttle response is excellent, I will also make some load trials to compare with the best carburettor version which may require a better radiator.

I am not yet happy with the twin. I think that the wedge stroke adjuster has too much mass/inertia for the speed range. The rack pieces are to make a smaller version of the helix control pump I am using on the diesel so I ca see if that will work better  :thinking: The biggest problem may be that the injected volume is 1/4 the volume of the horizontal so the pump working stroke is around 0.15-0.2mm. I am looking at a 1.5mm bore pump but that changes every component on the way  :headscratch:  ::)
Best regards

Roger