cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 5, 2024 8:39:17 GMT -5
Hello! Over the past few months I have been lurking here and learning as much as I can while building my own first turbocharger engine. I'm finally far enough where I believe I can start asking questions. I have recently created my fuel system, and am having an issue with tripping the safety valve inside the propane tank. I did a static fire of just my fuel system alone, and whenever I put too much on the throttle, the safety valve cuts in and my propane's PSI drops to about 20psi. My hose that is connected to my engine does not have a regulator, and when I throttle I go little by litte so there isn't a huge change in pressure all at once. How do you guys get past this so you get more throttle from your engine? Surely my engine would stop running if I only had 20psi of propane going into it. Thanks in advance!
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Post by racket on Aug 5, 2024 16:11:17 GMT -5
Unless you can source a cylinder without the safety feature you may need to change over to liquid fuel , industrial propane tanks are an option though
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 5, 2024 18:46:13 GMT -5
Unless you can source a cylinder without the safety feature you may need to change over to liquid fuel , industrial propane tanks are an option though I thought it was common to use propane as a fuel? Have you ever heard of sourcing one with the safety valve? |
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Post by racket on Aug 5, 2024 19:59:04 GMT -5
Hi
What country are you in ??
Some countries have them , others don't .
Also , what size is your turbo, as this will determine your fuel requirements ??
Propane use is common for small turbos , but easier to use liquid for larger ones .
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 5, 2024 20:42:59 GMT -5
Hi What country are you in ?? Some countries have them , others don't . Also , what size is your turbo, as this will determine your fuel requirements ?? Propane use is common for small turbos , but easier to use liquid for larger ones . USA Using a cheap maxapeedingrods turbo with a 61.5mm inducer |
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Post by racket on Aug 6, 2024 0:19:32 GMT -5
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 6, 2024 7:10:38 GMT -5
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 6, 2024 7:47:58 GMT -5
One more thing, if I were to switch to liquid how do you find out the math regarding GPH, spray angle, etc? I've seen it done on this forum before but never knew how they came to the results. Also, if I used a brass nozzle wouldnt it melt? Do I need a completely SS nozzle? Thanks! EDIT: www.mcmaster.com/32885K403/ I found this spray nozzle, it would fit into my current FT end cap perfectly, and at a 90 degree spray angle it would hit right on the center of the primary holes, maybe slighty above (half an inch or so). Do you see anything wrong with this nozzle? Also, you dont realize how much your help means to me! |
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Post by racket on Aug 6, 2024 19:39:43 GMT -5
Hi
A 61.5 mm inducer will flow ~0.75 lbs/sec of air , this will require ~0.75 lbs/min of liquid fuel, or 45 lbs/hr , if you run a P2 of ~25 psi then a 044 pump at 125 psi fuel pressure will have 100 psi pressure drop across the nozzle , so you need to use a nozzle that will flow that.
45 lbs of fuel equates to ~6 US gallons , so a 6 GPH nozzle running 125 psi should be about right , the nozzle in your Link is way too big at 10 gal per MINUTE :-(
Maybe a US Member can point you to a supplier :-)
Cheers
John
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 6, 2024 21:01:52 GMT -5
Hi A 61.5 mm inducer will flow ~0.75 lbs/sec of air , this will require ~0.75 lbs/min of liquid fuel, or 45 lbs/hr , if you run a P2 of ~25 psi then a 044 pump at 125 psi fuel pressure will have 100 psi pressure drop across the nozzle , so you need to use a nozzle that will flow that. 45 lbs of fuel equates to ~6 US gallons , so a 6 GPH nozzle running 125 psi should be about right , the nozzle in your Link is way too big at 10 gal per MINUTE :-( Maybe a US Member can point you to a supplier :-) Cheers John Thank you so much for breaking it down! www.mcmaster.com/product/32885K307I found this other nozzle, it’s the exact same but it has less fuel flow. It still seems like it would be a little higher than what you stated, but would it be close enough? Also, if I just lower the pressure via a throttle, could I just do that to reduce the amount of fuel injected? |
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Post by racket on Aug 6, 2024 23:17:48 GMT -5
That new nozzle is still in gallons per MINUTE ( GPM) , you need a nozzle in gallons per HOUR ( GPH) ...............checkout delavan.com/ |
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 7, 2024 8:30:17 GMT -5
That new nozzle is still in gallons per MINUTE ( GPM) , you need a nozzle in gallons per HOUR ( GPH) ...............checkout delavan.com/I didnt catch that, thanks for bearing with me! www.mcmaster.com/products/nozzles/spray-nozzles-1~/fogging-nozzles-7/I found this new nozzle, 6.36 GPH at 100psi, all stainless, full cone, and 90 degree spray angle. However, it is a fogging nozzle, is there a big difference between fogging and misting in regards to our engines? Also, it has an impaction pin that goes over there orifice, Im not sure if youve seen or used nozzles like this with any success?. I just wasn't sure if that pin would cause uneven burning on one part of the FT. There's also another of the same kind of nozzle that produces 6gph off of 40psi, would that work as well with a 70psi pump or so or would it not atomize enough? Also, is there any difference in using 1/4 or 1/8 size hoses for the fuel pump up to the nozzle? |
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Post by racket on Aug 7, 2024 18:02:14 GMT -5
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cebaero
Junior Member
Joined: August 2024
Posts: 52
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Post by cebaero on Aug 7, 2024 18:33:16 GMT -5
Is there a specific reason you think it would potentially come off? That specific nozzle would fit perfect in my engine, so if the only thing that could go wrong with it is handling damage, then I can just make sure to take extra care of it before it gets into the engine. Also, is there a specific place I could source a fuel pump? All the 044 pumps I find are only 45-75 psi |
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Post by racket on Aug 8, 2024 2:28:22 GMT -5
You can always try it , I'll be interested to hear how it performs :-)
044 pumps can go to higher pressures , the flow simply reduces , which will be OK with your sized engine , you might be able to find a different pump on Ebay
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