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Post by racket on Nov 24, 2019 16:40:40 GMT -5
Hi Anders
LOL..................."scientific approach" ...........I've been trying to get you down that path for quite a while without success ;-)
I feel we really needed a bit more "pure thrust" testing first before adding the freepower as its much easier finding and correcting issues when things are stationary rather than at high speed on the road , but having said that , I understand where you're coming from and the testing approach you want to use ..............GO FOR IT :-)
Yep , I'd be adding a few more thermo pickups into the interstage ducting, hard up against the NGV, to make sure those temps are under control............if they're not close to what you had when producing "thrust", we'll need to find out why , theoretically the Allison NGV with be "oversized" for the projected mass flow and pressure in the interstage , so your temps should be lower than your earlier testing when on thrust.
I'm looking forward to seeing that big smile of yours after the first ride .
Cheers John
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Post by Johansson on Nov 25, 2019 3:20:43 GMT -5
Hi John,
A sensible thing to do would be to continue the test runs in the rig until I have lots of full power data to digest, but I guess I am only sensible until things start to get boring.🙂
Nah, I need to get this show on the road now. What I lose by calling the gas producer tests off I will gain by getting more run time out of the chassis and drive train.
Is it possible to fit several temp probes to an Autometer EGT gauge and connect them so the reading is the average temp?
I hope to see idle temps in the low 500's with the freepower stalled.👍🏻
Cheers! /Anders
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Post by racket on Nov 25, 2019 3:38:30 GMT -5
Hi Anders
LOL......boredom is a good reason to move on :-) time "in the saddle" will be a lot more enjoyable and will keep the enthusiasm alive .
The reason why I wouldn't try for an average temp is because I'd like to know where any hot spot was for diagnosing reasons .
If I'd averaged my 12/118 temps when there was 200 C degrees difference between thermocouples I wouldn't have realised there was a major combustion problem , ideally I'd like to have 6 thermocouples spread around the jetpipe, those very high temps you experienced with the last JU-01 run might have only been in one segment where the thermo was fitted , but what caused it we don't know .
Low 500s should be possible , if not , you might need to fit a "wastegate" , but I'm confident your engine should run fairly cool at idle .
Cheers John
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Post by Johansson on Nov 25, 2019 13:46:43 GMT -5
That is true, before I do anything else I will see if I can find a display for 6 temp probes and fit connections around the interstage duct closest to the NGV. Cant afford six Autometer gauges...
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Post by racket on Nov 25, 2019 15:40:49 GMT -5
Hi Anders
Even if they're only cheap Ebay units with the pickup fitted into small diameter blind holes in the NGV , Olov should be able to recommend a 6 position rotary switch so that one measuring unit can be used with 6 pickups , once the engine is operating simply turn the switch to see if theres any temp variations in the various segments of the NGV .
Maybe one of our less "electronicly challenged" Members will think of a better solution, ..............throw some ideas around :-)
Cheers John
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Post by azwood on Nov 25, 2019 16:17:50 GMT -5
That is true, before I do anything else I will see if I can find a display for 6 temp probes and fit connections around the interstage duct closest to the NGV. Cant afford six Autometer gauges... Take a look at innervate motorsports website they have a lot of data logging stuff I'm sure there's one with multiple temp probes.i have one I use for my bikes.
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Post by azwood on Nov 25, 2019 16:22:56 GMT -5
Looked it up it has four probe's Attachments:
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Post by Johansson on Nov 25, 2019 17:05:48 GMT -5
I am not sure about ebay sensors, I went through a handful of different ones before I opened the wallet and bought the Autometer gauge and sensor. Lesser quality ones showed values like throwing a dice.🙄
A logger is good but I need to see the temps in real time so I can shut down the engine in case one of the positions read a dangerously high temp.
Perhaps an Arduino based temp reader with an lcd screen and 6 sensors connected to it? I can add the sensor mounts now and assemble the bike, then just fit the sensors later when I have decided on the best approach. I dont want to sit on my hands for months until I have a temp reader completed, I need to get the bike ready for testing before spring and shooting season arrives.
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Post by azwood on Nov 25, 2019 17:28:47 GMT -5
Maybe more like this one Attachments:
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Post by racket on Nov 25, 2019 17:46:47 GMT -5
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Post by azwood on Nov 25, 2019 18:13:17 GMT -5
Think this one was about $300 not cheap but there aren't many that read multiple temps at the same time in Anders case it might be a must have item
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Post by racket on Nov 25, 2019 19:01:30 GMT -5
To keep costs down, Anders probably only needs a basic thermo , no logging functions , just numbers on a screen he can check from time to time to make sure they're all within ~50 deg C of each other , if theres a hot spot he could cross check it with an infra red thermo and compare it with other spots around the interstage duct .
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Post by Johansson on Nov 26, 2019 0:15:51 GMT -5
Awesome! Thanks Azwood for the idea, the cheap one John linked to is perfect so I just ordered it. This 4-channel thermometer will be very useful for the iceyacht testing as well so a great find! Some years ago there was a discussion about decently priced thermocouples for EGT measuring, anyone who has a link to where I can find them? Cheers! /Anders
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Post by racket on Nov 26, 2019 3:19:34 GMT -5
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Post by Johansson on Nov 26, 2019 6:51:16 GMT -5
Thanks John, I'll just make some m5 weld bungs and fit to the interstage duct and continue assembly then!👍🏻
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