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Post by smithy1 on Aug 31, 2014 18:15:59 GMT -5
Hi Smithy Heh heh , yep, I'd be grinnin' :-) The V band is a common Garrett turbo compressor scroll band from their truck sized units, you should be able to get one from Garrett at Chipping Norton , 14 Alfred Road....I'll PM you some details of my contact. All good :-) Cheers John Thanks for the info John.....you're a great help as usual Cheers, Smithy.
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Post by smithy1 on Aug 31, 2014 15:48:05 GMT -5
Hi Smithy Ah , thats excellent news about the hot streak :-) Could the "flutters" be a caused by a lean mixture ?? Cheers John You could well be right about the lean flutters, we'll soon find out I suspect.. I'm only seeing ~1-1.5m of flame at 5psi P2. My little 1/4 scale has well over 3m as you've seen. The flutters only seem to occur above ~12-15psi P2. The dedicated H/S pump is due here in the next week or two, it's not as big as the 044 pump capacity/pressure wise but the H/S doesn't need it, as you're well aware it only needs to overcome the ~35psi P2 combustor pressure, the pump is capable of 4bar (59psi) @ 130l/h, possibly similar to the engine fuel pump you used. I think the 1.00mm hot streak orifice is on the money too. Yesterday I also gave her a couple of shots @ 25psi P2, a nice pop and a solid hit..... and then @ 35psi P2 and she nearly jumped the wheel chocks , was sliding along the ground a few inches too, I had a friend holding the brakes on for me whilst I was fiddling with the controls. She's certainly got some extra punch . I wish you were there John, would certainly have put a silly grin on your head....I sure as hell had one . On a side note, I need to source a new "V" band clamp for the outer combustor case, the old one is not well, one of the spot welds holding the clamp together has broken and the strap itself is split under the weld, I suspect I may have over tightened it during one of my modification sessions, didn't notice it until I was loading her back into the van yesterday. Do you know where I might be able to source one? I think it's ~9" diameter. All in all, a good days testing/running..... The "Green Beast" lives. Cheers, Smithy.
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Post by smithy1 on Aug 31, 2014 2:14:36 GMT -5
Hi John, Well.....the hot-streak works...and the A/B works...so smiles all round The A/B definitely needs more fuel as I was only getting a small-ish flame out the back @ idle. Hopefully the dual 044 pumps will supply enough....also hoping the new hot streak pump and fittings will turn up soon. The hot-streak also appears to be able to light off the A/B at pretty much any rpm/P2 as well, the flame holder is indeed doing it's job although I did note a few "flutters", methinks the 400ft/sec speed is very close to the mark or possibly exceeded. I gave the hot-streak a couple of quick hits without the A/B and there's a nice feather of flame out the end of the pipe....ideal. Unfortunately I have no video of the test run, but my friend may have some on his Go-Pro....hopefully he has.. Cheers, Smithy.
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Post by smithy1 on Aug 28, 2014 18:56:09 GMT -5
LOL......Forgot about the "little" pump feeding the combustor :-( It ain't so little.....feeds the 6041 nicely...with plenty to spare as well.. I'll use a similar pump for the H/S when it arrives, then transfer the second 044 pump to parallel the first in the A/B system.....geeze, it'll need another battery to run everything....might have to rig up an alternator to run off one of the wheels... Cheers, Smithy.
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Post by smithy1 on Aug 28, 2014 17:24:45 GMT -5
Actually...there's three pumps feeding her at the moment, twin 044's for the A/B-H/S.. plus the engine pump....with a fourth to come soon..! Yeah...I believe the 044 pumps are good for ~500+hp each... Cheers, Smithy.
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Post by smithy1 on Aug 28, 2014 16:55:45 GMT -5
Hi All, Here's a pic of the "Dual A/B pump" setup: This is the dual pump assembly and hot-sreak solenoid "mock-up" which sits on the floor pan just behind the seat. When I'm certain it works nicely I'll clean up all the plumbing and make it look pretty..There's still some connectors and fittings I've not received yet to finish things off. I've also fitted a "pressure tap" in the hot streak line so I can keep tabs on it. I've wired the H/S pump and H/S solenoid to activate together via a 12v 30a relay. The A/B pump is activated separately via another relay which John had already fitted in the system. Cheers, Smithy.
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Post by smithy1 on Aug 27, 2014 22:00:02 GMT -5
....And maybe a spring loaded tensioner for that chain roller..!
Cheers, Smithy.
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Post by smithy1 on Aug 27, 2014 21:45:36 GMT -5
Yeah...I think you're right about the air going into the fuel tank....I better make sure there's plenty of "breather" available....I'd hate to see the tank trying to suck itself inside-out...or should I say "atmospheric pressure" trying to push it in... I have a chain block in the shed....strangely...I never even thought of using it.... I also have a couple of those load straps used for towing 4WD's out of trouble, they should do the trick nicely. What do you think she'd weigh John..?? I'm guessing ~200kgs or so??? Cheers, Smithy.
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Post by smithy1 on Aug 27, 2014 18:09:07 GMT -5
Hi Smithy If it doesn't catch fire in there , it never will :-) It must be getting a bit "crowded" behind the seat with all these extra bits and pieces , LOL....you'll be needing universal jointed elbows to work in there. Cheers John Well, to be honest, it should look ok, I've got a nice "twin" pump bracket to hold the 044 pumps....the plumbing should be relatively functional if not terribly neat.... with a separate third pump to come in the near future. This A/B system is going to have some serious fuel flow potential. I'll be testing the system with one 044 pump for the A/B and the other supplying the hot streak....As you mentioned....if it doesn't light now there's something seriously wrong..!! The second 044 will be transferred to the A/B system when I get the third pump online, this third one will then feed the hot streak....Plenty more testing to be done...I'm more than happy with the running and performance of the engine itself...it's just all the ancillary bit's 'n bob's which can cause some grief and unanticipated issues. I've got the right side of the kart up on a piece of timber ~8" off the ground so I can get at the bolts etc from underneath.....and have temporarily removed the seat so I can actually get in there to work on things....much more betterer... Cheers, Smithy.
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Post by smithy1 on Aug 27, 2014 16:50:07 GMT -5
Hi John, Here's a pic of the hot streak internal line, just mocked up at the moment... obviously I've not bent it neatly into place or lockwired it to the flame tube, I was just getting lengths and positions correct before final fitting. Where it goes into the primary zone, I have it bent to point directly at the turbine housing inlet via a 1mm orifice. I have started fitting the second Bosch 044 pump and it's plumbing behind the drivers seat, still need to pick up a couple of fittings and some spare fuel hose hopefully this afternoon.... should be done by tomorrow-ish. I'll then set about getting the switch, fuse and relay wiring sorted, shouldn't take too long..I hope! Cheers, Smithy.
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Post by smithy1 on Aug 26, 2014 18:17:57 GMT -5
Yeah John....aren't we lucky not to get lumbered with snow here in most parts of Australia? Even in the middle of winter we can still get things done around the house..! Bring on Spring and daylight savings..!
Anders, you should pack up everything and setup "down-under" here with us.!
Cheers, Smithy.
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Post by smithy1 on Aug 26, 2014 17:17:30 GMT -5
Hi Smithy Yep , an independent pump sounds good , that way you can also test the hot streak without needing the A/B fuel pumps going , .........you might also be able to get the A/B to light at higher P2s as well, the dedicated pump will adjust to whatever the P2 is . You'll have it sorted in no time :-) Cheers John I do have a smaller high pressure pump sitting at home which may do the job, it's ~1/2 the volume capacity of the 044 pump but can still deliver a decent pressure, up to ~4bar, so that may well do the trick for us. I've made a new fitting for the lower outer combustion case to suit the hot streak, just need to bend up a new internal stainless line and point it in the appropriate direction and I should be good to go for further testing. Has been raining pretty heavily here in Sydney over the last few days, actually raining quite hard as I type.... hopefully it'll clear up soon so I can do a little more work/testing on the "Beast". Cheers, Smithy.
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Post by smithy1 on Aug 26, 2014 14:37:59 GMT -5
Hi Smithy I just noticed in an earlier email from Andrew that you guys discussed the possibility of the P2 pressure being higher than the A/B fuel pressure , thats a possibility, heres my reasoning ..............the A/B fuel ring has 16 X 1mm holes , with the pump only supplying ~3.4 lpm thats only a tad over 200 ml/hole , now back when I was making the 2 shaft kart I did some testing of flows thru its 4 hole fuel distributor , it had 4 X 1/32"( 0.8mm) holes and flowed at ~200ml/hole/min at 5psi fuel pressure . If the GT6041 had 5 psi in the combustor there might not have been sufficient pressure available to get the hot streak to work . Cheers John That does sound feasible, Andrew (enginewhisperer), AndyM and yourself are probably correct, I should have thought this through a bit more perhaps . I think the best course of action is to run the two 044 pumps in parallel for the A/B flow via a decent check valve, that should be plenty ....then a smaller separate high pressure pump, (independent of the other two), for the hot streak running through the solenoid and it's own check valve via another feed line, this should eliminate any possibility of P2 pressure causing grief ....does that sound like a plan?? We'll get it sorted eventually. Cheers, Smithy.
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Post by smithy1 on Aug 25, 2014 18:31:26 GMT -5
Hi Craig, I've had a few of the JJ-1400 engines, still have a couple at home in various stages of assembly, even a JJ-3000 and a couple of Kingtech's, K80E and a K180G full kerosene start.
Cheers, Smithy.
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Post by smithy1 on Aug 25, 2014 18:16:59 GMT -5
Hi John, Yeah, she's nice and clean inside and nothing like your 10/98's first run, (I remember you sending that pic to me many moons ago)....and it's obvious there's plenty of tertiary dilution happening, I suspect this may be the issue with the hot streak not working, I had it entering into one of the large tertiary holes with the nozzle outlet a good 1" below that, needless to say there's not much in the way of flames way down there.
I'll set about fitting my hot streak nozzle outlet a lot further up the flame tube. There's not a lot of room between the outer case and the upper part of the flame tube, so I might fit my connector in the bottom half of the outer case which will give me plenty of room to fit internal fittings and stainless tube, which I'll run up the outside of the flame tube, I think I'll go -3 this time, that's still plenty for a hot streak.
I'll take some more pics as I go so you can see what I've done.
Cheers, Smithy.
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