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Post by azwood on Mar 17, 2018 21:09:36 GMT -5
Looking at fueling still tested those jets I have they don't atomise at all should have known that but some days your the dog some days your the fence post.has anyone used a fuel injector and just had a switch to keep it in the open position.it just seems that the better I can atomise the fuel the better everything will work with the vape tubes Just need an idear of what c.f. I'd need it's 5cc per horsepower on my bike. |
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Post by azwood on Mar 17, 2018 21:10:22 GMT -5
C.f.m rather
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Post by azwood on Mar 17, 2018 21:57:13 GMT -5
Starting to look like something now just need the charge pipe and some sorta clamp to hold the can together a v band would be nice but at $260 I'll find something else lol   |
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Post by racket on Mar 18, 2018 16:20:38 GMT -5
Hi
Looking good :-)
Yep , Vbands the way to go if you can find the right size , large truck turbo overhaulers have lotsa dead turbos that can provide the right sized V band off the comp scroll .
Even with a V band you'll need to make flanges , as long as the machined flanges are fairly thick (>8 mm each ) then 15 small 6 mm bolts will do a decent job of holding things together
Cheers
John
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Post by smithy1 on Mar 18, 2018 20:59:45 GMT -5
I see the bigger primary holes you have verry close to the top corisponding with the vape tubes is this set up for jet fuel  This flame tube is the original one John made for his Garrett GT6041 powered afterburning Go-Kart, John was kind enough to pass the "Beast" on to myself. This flame tube was a beautiful design for evaporator type injection and worked really well, it had smooth, stable combustion at all rpm/P2 settings...it ran really sweetly. Due to some burning issues I've since converted the engine to a single high pressure, (~750psi+), 80-90 degree "semi-hollow" spray pattern fuel injector with an entirely different flame tube design, only the lower tertiary/cone section survives today....it now makes silly power & thrust but is not as nicely running at low rpm as it was with John's original vaporizer setup. It now runs a bit fluttery at low rpm/P2, possibly due to a primary/secondary mismatch and/or poor fuel atomaization down low... but at mid to high rpm/P2 and fuel pressures over ~350psi she really comes to life....with the A/B running she'll now re-arrange your internal organs...and is tremendous fun to run and operate. Smithy. |
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Post by azwood on Mar 19, 2018 2:08:04 GMT -5
I see the bigger primary holes you have verry close to the top corisponding with the vape tubes is this set up for jet fuel This flame tube is the original one John made for his Garrett GT6041 powered afterburning Go-Kart, John was kind enough to pass the "Beast" on to myself. This flame tube was a beautiful design for evaporator type injection and worked really well, it had smooth, stable combustion at all rpm/P2 settings...it ran really sweetly. Due to some burning issues I've since converted the engine to a single high pressure, (~750psi+), 80-90 degree "semi-hollow" spray pattern fuel injector with an entirely different flame tube design, only the lower tertiary/cone section survives today....it now makes silly power & thrust but is not as nicely running at low rpm as it was with John's original vaporizer setup. It now runs a bit fluttery at low rpm/P2, possibly due to a primary/secondary mismatch and/or poor fuel atomaization down low... but at mid to high rpm/P2 and fuel pressures over ~350psi she really comes to life....with the A/B running she'll now re-arrange your internal organs...and is tremendous fun to run and operate. Smithy. Sounds like vap tubes are a good thing.any idear what size jets you had for pilot and mains and how many |
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Post by azwood on Mar 19, 2018 2:10:27 GMT -5
Hi Looking good :-) Yep , Vbands the way to go if you can find the right size , large truck turbo overhaulers have lotsa dead turbos that can provide the right sized V band off the comp scroll . Even with a V band you'll need to make flanges , as long as the machined flanges are fairly thick (>8 mm each ) then 15 small 6 mm bolts will do a decent job of holding things together Cheers John That's it either way I need flanges I really don't mind the look of bolts with nice caped nuts anyways. |
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Post by racket on Mar 19, 2018 3:14:25 GMT -5
Hi
LOL , its been a while since construction of the engine , but I think there was a sort of fuel manifold made with 6 large bore syringe needles ( from the Vet) used to supply fuel to each vapouriser , as for the LPG preheat ..........I can't remember :-(....................Smithy should be able to give you a better idea of what was in there .
Yep , lotsa small bolts and nuts look very "aerospace" ;-)
Cheers
John
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Post by azwood on Mar 19, 2018 4:04:14 GMT -5
Been working on the charge pipe need some more shapeing but it's look ok I think  |
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Post by azwood on Mar 19, 2018 4:05:37 GMT -5
Hi LOL , its been a while since construction of the engine , but I think there was a sort of fuel manifold made with 6 large bore syringe needles ( from the Vet) used to supply fuel to each vapouriser , as for the LPG preheat ..........I can't remember :-(....................Smithy should be able to give you a better idea of what was in there . Yep , lotsa small bolts and nuts look very "aerospace" ;-) Cheers John Thanks mate I thought you just used carby jets |
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Post by azwood on Mar 19, 2018 4:07:34 GMT -5
One thing I'm not sure of is it ok to discharge the air left and right of the can or does it create turbulence
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BFTO
Veteran Member
Joined: February 2016
Posts: 128 
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Post by BFTO on Mar 19, 2018 6:00:23 GMT -5
Try and put your entry tube as low as you can on the combustor,you can get some problem with that entry in the primary zone.
And put it in straight in the combustor.
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Post by pitciblackscotland on Mar 19, 2018 6:38:16 GMT -5
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Post by azwood on Mar 19, 2018 6:54:15 GMT -5
Ok I just always seen the about a 3rd from the top thought that was where they go because the fuel and burn was there so your saying to fovor the sustain holes. |
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Post by racket on Mar 19, 2018 15:30:14 GMT -5
Hi LOL , yep , its a "favoured ??" spot by a lotta home builders , its one of those bad practices that keeps getting repeated because so many guys have done it previously, YouTube is full of them . Unfortunately those YouTube vids don't have performance stats , I lost count of the number of guys who contacted the Yahoo DIY Gas Turbines Group over the years with combustion problems because of that placement. High speed air hitting one side of the flametube forces more air through the holes adjacent to the entry tube , effectively blowing the flame to one side :-( Here a pic of where the delivery tube is positioned for the flametube on the GT6041 jetandturbineowners.proboards.com/attachment/download/216 and how you end up with a nice plenum for the air to dump into jetandturbineowners.proboards.com/attachment/download/217 ...............you can see the fuel distribution manifold inside the "round house" on top of the FT Cheers John |
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