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Post by pitciblackscotland on Aug 22, 2021 6:48:48 GMT -5
Thank you very much Mark! Those 7.5 gph injectors are the biggest you have? I’ve been looking around for a 20ish injector..or multiple injectors. How many 7.5s do you have? I might be able to use 3 per engine to meet my “goal”. I’d honestly need 6 if that’s the case. Thanks, Cullen Yeah that's the biggest i have, i think i have six will have a look tomorrow. Cheers, Mark.
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Post by turbojet atv on Aug 22, 2021 7:17:52 GMT -5
There's this 20gph 60° hollow nozzle www.anglo-nordic.com/steinen-ss-oil-burner-nozzles.htmlThere's probably more options for things in the us but there's this. I remember seeing some high flow nozzles on ebay.us but can't remember the keywords I searched, might have been monarch or fluidics nozzles I’ll take a look at that link you sent and check that nozzle out. Thank you 🙏
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Post by pitciblackscotland on Aug 22, 2021 19:36:52 GMT -5
Hi Cullen, your in luck i have six nozzles also photos of the boss i machine up to take the nozzle, there is a pilot hole at the other end. 19mm round stock and the length is 45mm can make longer or shorter if need be. Cheers, Mark.
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Aug 23, 2021 0:54:46 GMT -5
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Post by turbojet atv on Aug 23, 2021 3:39:36 GMT -5
Hi Cullen, your in luck i have six nozzles also photos of the boss i machine up to take the nozzle, there is a pilot hole at the other end. 19mm round stock and the length is 45mm can make longer or shorter if need be. Cheers, Mark. Awesome, thanks Mark. I’d be interesting in testing them on my engines. I’ll message you privately (I think I can do that) here shortly to see how long of a boss I’ll need. And thanks ausjet for showing me that injector. Thanks, Cullen
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Post by turbojet atv on Sept 1, 2021 18:56:11 GMT -5
Hello everyone, Shall we start experimenting now? Soon! Since this isn’t traditional how turbojets are made, let’s put this performance turbo to the tests. I’m wrapping up the engine soon now (slight delay, had to buy a new welder). until then, check out this experiment. 19.5gph bypass monarch nozzle. I’m not sure what fuel pressure is required for these to make their 19.5 rating but let’s experiment a little bit once the engine is finished. -Cullen
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Post by racket on Sept 1, 2021 20:46:16 GMT -5
Hi Cullen
Mount the nozzle in the lid of a large glass bottle , I used a BIG pickled onion bottle , make sure you have a small vent hole in the lid to prevent pressure buildup in the bottle , heh heh , you should see what 1,000psi produces ;-)
Most nozzles are rated for 100psi fuel pressure drop across them .
Cheers John
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Post by turbojet atv on Sept 2, 2021 2:32:01 GMT -5
Hi John.
With those nozzles, would a conventional fuel pump out of a performance car work or would making one out of a hydraulic gear pump (I think I’ve read that used before) be more suitable?
I’m interested to see how they’ll preform!
Thanks, Cullen
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Post by wannabebuilderuk on Sept 2, 2021 3:53:38 GMT -5
You need 100psi + chamber pressure and a little extra to be sure so call it 150/160 psi and you're looking at a very expensive efi pump when you can get a gear pump rated for 3000psi for $50 or less and you can run that at whatever pressure you want using an adjustable hydraulic pressure relief valve.
As long as you get the right sized gear pump so that max rpm flow is equivalent to nozzle flow since gear pumps produce a certain amount per revolution then all you need is a matching max rpm motor and then 0-100% on the pump is equal to 0-100% on the fuel supply, more or less.
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Post by racket on Sept 2, 2021 4:21:06 GMT -5
Hi Cullen This is what I used on my bike jetandturbineowners.proboards.com/thread/1366/tv84-turbine-bike?page=2 originally a 1cc/rev hydraulic pump which was replaced with a larger one driven by the IC motor thru the oilpump. If I was ever going to do another turbo based engine I go a hydraulic pump driven by a 24V scooter motor controlled via its "throttle" , virtually the same as the RC micro jet turbine engines just a bit bigger . With the throttle closed the motor stops and theres no flow , slowly open the throttle during spoolup and the pump rpm will rise delivering fuel to the engine . The relatively cheap 24/36V scooter motors of 500W power should be more than enough power ,though there are more powerful ones , they generally run 2500 rpm so a suitable sized hydraulic pump should be readily available. Cheers John
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Post by wannabebuilderuk on Sept 2, 2021 5:08:34 GMT -5
Adding onto what John said you can also get a 24v hydraulic pump from a tail lift on a scrap van and might be able repurpose it it however often easier to make your own with a smaller pump/motor
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Post by turbojet atv on Sept 2, 2021 7:22:16 GMT -5
Thanks guys!
I’ll do some looking to find a good gear pump to fit into my set up. Would it be a good idea to power both fuel & oil pump through the same motor? Like have reduction gears going to the oil pimp so it doesn’t exceed the 40psi I need for the turbos & at the same time have the correct pressure of fuel going to the injectors?
It looked like you had something similar to that on your bike John.
-Cullen
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Post by turbojet atv on Sept 2, 2021 7:31:32 GMT -5
Like let me elaborate on what I’m thinking.
I’ll have a custom gear box that looks like a V with a electric motor at the bottom of the V. The fuel pump will be on one end of the box and the oil pump on the other side. The gear box would have a ratio of gears power both fuel and oil pumps at the same time but at different ratios.
The motor would turn the oil pump up to its 30-50psi and the fuel pump would turn 150-170psi at full throttle.
Thoughts?
-Cullen
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Post by wannabebuilderuk on Sept 2, 2021 11:26:08 GMT -5
You could but when you go to start the engine you'd be flowing fuel even before you have oil flowing at enough pressure.
Just follow K.I.S.S - keep it simple silly. Go for two separate systems.
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Post by racket on Sept 2, 2021 18:48:38 GMT -5
Hi Cullen
Yep , 2 systems , very hard to "tune"them otherwise .
With a big turbo you can use a lot more lube pressure than 40psi , that would be a minimum pressure just before the interlock kicks off the fuel pump .
Cheers John
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