Fuel pump

[richardm]

Here's my latest fuel pump. A modified oil burner pump coupled to a reverse osmosis pump motor. It reached over 300 psi( The gauge limit..)
Ran for 1/2 hour at 250 psi at 24 volts and 28 watts

[richardm]

My variable fuel pressure regulator  Can be manually actuated or using a servo 

[racket]

Hi Richard

Now that's a very professional setup , nice :-)

Lotsa work making up those bits

Cheers
John

[richardm]

Thanks ! I was done trying to match my pump motor to ampm controller. So now 4th pump will be running at constant speed/ pressure and the regulator will control the pressure bypassing excess. Also an adventure in learning to cut a rack and pinion . That alone was quite satisfying. I Like making as much as I can myself Just bolting pre made stuff together is kind of boring

Now I have to figure out the layout and plumb the pump together with a safety presussure release valve ,filter and an emergency cut off solenoid valve.

If you ever need an pretty interesting servo here's the link www.amazon.ca/dp/B08DHW3ZGP?psc=1&ref=ppx_yo2ov_dt_b_product_details

It operates from 12 to 24 vdc and has adjustable travel range and speed Most interesting is that it can be controlled from a potentiometer ..no other electronic circuit required.

Another version of the same is available with 3600 degrees travel

[racket]

Hi Richard

Have you considered fitting a "differential relief valve" into the system to maintain constant pressure drop across the control orifice ??

I had to fit one to my bikes throttle jetandturbineowners.proboards.com/thread/1366/tv84-turbine-bike?page=2

Cheers
John

[richardm]

I must say that I did not. My ultimate goal would be to add an P-2 resistive pressure sensor in series with the throttle potentiometer ( kind of similar to on radio control trimmer) to tweak the fuel schedule in such a way that acceleration or deceleration is proportional to p2 increase or decrease . No fuel surge no matter how you handle the throttle.

It would kind of do the job of that P-3 sensor bellows on the illustration

[richardm]

My potentiometer throttle assembly to control my pressure regulator 
Has a fuel off spring detent and a micro switch to control the pump on off and a solenoid

[richardm]

Also here are picture of my ignition exciter 
First version had 4 HV generators.  Second one has only one much beefier generator Makes for a more compact unit Second version also has a faster rate.

[richardm]

My fuel pump and variable pressure regulator test rig 
Quite satisfied with its operation Pressure smhootly adjustable from 0 to 250 psi with pump running on 24 vdc at constant speed

[racket]

Very nice :-)

Lotsa bespoke bits of kit there

[richardm]

Thanks! Yes quite a bit of time spent on this but very happy with it Too bad I can't easily post video here. I was not happy with A PWM driving the pump at variable speed Couldn't match em to my satisfaction had to crank it up to start the motor and then back the pot...Now the pump is constant speed fuel exits the pump to a safety valve set a 250 psi ( for now and seems to be enough) Them it goes to the regulator with varie from fully open = 0 psi full to 250 psi almost no bypass
Everything is homemade with the exception of the servo
Servo itsel was a discovery to me It has 120 Kg / cm torque and adjustable travel ( 0 to 300 degrees ) and adjustable speed. It can be radio controlled but most interestingly, just y using a single potentiometer skipping some circuitry

[richardm]

I just did a fuel flow test  I get 12,2 liters or about 22.8 pounds per hour ( 2.68 imp. gal or 3.22 US gal. )
Might be a little low but i think it should be enough to make it run  I will see from there. for those burning propane it is equivalent to about 30 pounds of propane an hour.

Here's my nozzle  A PT-6-27 turbine has 14 of them. It makes for around 300 pounds per hour with is consistent with observed burn in cruise.   (0.67 lb/hp/hr.)

I dont know my engine efficiency but assuming the same as the PT- 6 ( with I know it is not)  it would boil down to 32 hp on my turbo

Here' the nozzle In fact its only the business end of a nozzle assembly

[racket]

22.8 lb/hr of fuel , so roughly good for a mass flow of 22.8 lbs/min of air , divide by 12 lbs/sq in/min for the inducer = a 1.55"- 39.5mm dia inducer ...............yep , for your sized turbo you'll be needing considerably more to reach full power , ~3 times more flow ..............but you'll get her fired up on it :-)

[richardm]

Yeap Im realizing by looking at my compressor map that I would need more than 3 times that fuel flow.. Makes the thing very very inneficient

But I'll see what I get first and two options A larger nozzle or a primary \ secondary nozzle system

I dont see the need to increase pressure as the nozzle flow is not linear to pressure I wouldn't get much more fuel flow at double the pressure

[racket]

Yep , high pressure fueling is sorta self limiting for safety, you'd be needing >2500 psi to get the flow , .........bigger nozzle for sure :-)