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Post by wannabebuilderuk on Feb 11, 2024 6:12:10 GMT -5
On my test stand I have a combination of 12 and 24V systems , my engines fuel pump is a 044 pump but running on 24 V from the starter motor batteries ( 2 X car batteries) , it screams its head off but gives me the flow I need at the required pressure , the A/B has 2X 044 pumps running on 12V , low pressure allows plenty of flow . The ancillories like ignition , oilpump , A/B fuel pumps and 12V relays run off a combined car and deep cycle pair of batteries . Your 24V fuel pump won't be drawing a lot of amps on 24 V Pump says 26a on it so with load I'm gonna guess closer to 30/35 at full throttle, oil pump says 23 so again probably closer to 30a continous when it's cold. Gauges and relays etc probably 1/2a draw. Oil pump might only draw a lower amount I don't know yet as next thing to test after combustion chamber, I'll see what idle/full pulls for the fuel as well. Might be easier just to run the fuel at 12v on lower pressure but without getting different nozzles I'm not sure if the less restriction of a 9gph will give the 300psi I get at 12v with the 6gph. A single battery would be simpler and not require 24/12v converter or more wiring hassle with my relay setup, I have a 70a used as the main breaker which feeds the fuel/oil relays but with different voltages I'd need to redesign it slightly. I suppose its only gonna run (if it even does lol) for a couple of minutes so 2 medium sized car batteries should do, just a lot of space to take up.
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Post by wannabebuilderuk on Feb 11, 2024 13:06:07 GMT -5
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Post by wannabebuilderuk on Feb 14, 2024 10:14:46 GMT -5
Well tried to do a spark and chamber burn test but encountered two problems, first being the spark refused to ignite the diesel spray and second being it seems the hv modules have both randomly burnt out now only after 15s of use which during previous testing was fine 🤬 ![](https://i.ibb.co/L8Rsbbg/20240214-150756.jpg) I'm wondering if these "12v 20kv" modules are actually not really rated for 12v hence failing, andym is it 6v ones you use? This is the type I have found works but seems to randomly burn now www.ebay.co.uk/itm/225181921116
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Post by andym on Feb 14, 2024 10:43:48 GMT -5
yep..... but with voltage control
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richardm
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Post by richardm on Feb 14, 2024 10:44:59 GMT -5
My first prototype igniter used 4 modules similar to yours They did not failed But I tend to think that they are overrated I have replaced them with a single more powerful unit I get a more compact unit and a faster sparking rate 2- 3 sparks / second. www.aliexpress.com/item/1005004192104392.html?spm=a2g0o.order_list.order_list_main.94.21ef1802DOzYoBI also had ignition problems while testing my flame tube. The position of the spark plug is critical I found that the air flow must not be too high for a successful ignition. In my flame tube too much air flow pushed the fuel away from the spark Sometimes it would ignite but the fire "nugget" was extinguished right away (Like blowing a candle ) before the flame could spread to the rest of the fuel I then had successful ignitions starting with a low air flow and low fuel flow. Once ignited the flame was self sustaining at any air / fuel setting I ve read many papers about real jet engine ignition and according to those the correct igniter plug placement ,despite all the knowledge, remains in the trial and error domain... In other words PFM..
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Post by wannabebuilderuk on Feb 14, 2024 10:50:36 GMT -5
yep..... but with voltage control You mean a 12v to 6v converter? Like www.ebay.co.uk/itm/276029711318 Which generators do you use the links you posted in your videos of testing it don't work anymore ![:(](//storage.proboards.com/forum/images/smiley/sad.png)
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Post by wannabebuilderuk on Feb 14, 2024 10:53:06 GMT -5
My first prototype igniter used 4 modules similar to yours They did not failed But I tend to think that they are overrated I have replaced them with a single more powerful unit I get a more compact unit and a faster sparking rate 2- 3 sparks / second. www.aliexpress.com/item/1005004192104392.html?spm=a2g0o.order_list.order_list_main.94.21ef1802DOzYoBI also had ignition problems while testing my flame tube. The position of the spark plug is critical I found that the air flow must not be too high for a successful ignition. In my flame tube too much air flow pushed the fuel away from the spark Sometimes it would ignite but the fire "nugget" was extinguished right away (Like blowing a candle ) before the flame could spread to the rest of the fuel I then had successful ignitions starting with a low air flow and low fuel flow. Once ignited the flame was self sustaining at any air / fuel setting I ve read many papers about real jet engine ignition and according to those the correct igniter plug placement ,despite all the knowledge, remains in the trial and error domain... In other words PFM.. The link doesn't appear to work, yea in theory I've place the spark in the right position to intersect the spray so it might just be it doesn't have enough oomph for diesel but maybe kerosene will.
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Post by andym on Feb 14, 2024 11:06:44 GMT -5
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Post by andym on Feb 14, 2024 11:09:17 GMT -5
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Post by wannabebuilderuk on Feb 14, 2024 11:32:33 GMT -5
That all that's in your magical stupidly fast firing box lol (other than the 20kv diode/spark gap/microwave capacitor) The 6v 30a seems a bit overkill, they can't be pulling that much current at 6v?
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richardm
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Post by richardm on Feb 14, 2024 11:45:58 GMT -5
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Post by richardm on Feb 14, 2024 11:54:01 GMT -5
I ve found the same unit i m using on eBay High Voltage Packet Driver Board High Power Inverter 12V ... eBay www.ebay.ca › itm High Voltage Packet Driver Board High Power Inverter 12V Electrostatic Generator ; Item Number. 176079757504 ; Brand. Unbranded ; Accurate description. 4.9.
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Post by wannabebuilderuk on Feb 14, 2024 12:49:09 GMT -5
I ve found the same unit i m using on eBay High Voltage Packet Driver Board High Power Inverter 12V ... eBay www.ebay.ca › itm High Voltage Packet Driver Board High Power Inverter 12V Electrostatic Generator ; Item Number. 176079757504 ; Brand. Unbranded ; Accurate description. 4.9. Looks to be a simpler version of a zvs driver and ignition coil, where's the return on the output lead is it the metal strip on the black bit
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richardm
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Post by richardm on Feb 14, 2024 14:35:36 GMT -5
Right Also what kind of spark lug are you using ? Mine is IC type plug but resistor less Why would you put any resistance in the way to a hot spark..
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Post by wannabebuilderuk on Feb 14, 2024 16:41:25 GMT -5
Right Also what kind of spark lug are you using ? Mine is IC type plug but resistor less Why would you put any resistance in the way to a hot spark.. Using a actual jet engine igniter I got from Andy, no resistor in it?
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