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Post by azwood on Sept 10, 2018 4:56:28 GMT -5
Things are still moving forward trying to find space for all the gauges and switches.ive had her running on lpg for preheat that went well.the oil systems working well too.time for some diesle tanks and a pump soon.   |
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Post by racket on Sept 10, 2018 5:18:50 GMT -5
Yeh , there never seems to be enough space for everything , just gotta be a bit inventive , good to hear the early testing is going well :-)
Cheers
John
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Post by azwood on Sept 10, 2018 15:28:40 GMT -5
Yeh , there never seems to be enough space for everything , just gotta be a bit inventive , good to hear the early testing is going well :-) Cheers John Yeah ill get there.should have it ready to test on diesel soon |
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Post by azwood on Sept 10, 2018 20:41:45 GMT -5
Ok been testing on lpg more the egt's seem to get high it hit 850 before i shut it down and put the blower back on it.i know with plg temps can read a little higher than kerro or diesel is this anything to worry about.?
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Post by azwood on Sept 10, 2018 20:43:05 GMT -5
I read up on egts of the trucks the turbo cum off they say 1300 is safe seems verry high.
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Post by azwood on Sept 10, 2018 20:43:54 GMT -5
Anyway ill keep building.  |
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Post by racket on Sept 10, 2018 20:59:20 GMT -5
1300 would be degrees F , thats ~700 degrees C , for a jetpipe temp that 700C would be OK at low rpm (idle at 5 psi P2) but it might pay to reduce it to ~650 C once up to higher rpm/pressure ratios as there'll be more temp drop through the turb stage so a much higher turbine inlet temperature, T I Ts can be anything up to 150 C degrees hotter than the jetpipe temps( TOTs) at full power.
Your jetpipe temps should be the same irrespective of the fuel being used , LPG should burn a lot faster and would normally produce the "lowest" temperatures,
Cheers
John
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Post by azwood on Sept 11, 2018 2:56:49 GMT -5
Ok ill need to think about how to fix it i think i may have an air leak on the flange to the outer can so ill fix that and see if it helps at if not maybe ill need water injection or something but its running great just need to adress those tot's. 1300 would be degrees F , thats ~700 degrees C , for a jetpipe temp that 700C would be OK at low rpm (idle at 5 psi P2) but it might pay to reduce it to ~650 C once up to higher rpm/pressure ratios as there'll be more temp drop through the turb stage so a much higher turbine inlet temperature, T I Ts can be anything up to 150 C degrees hotter than the jetpipe temps( TOTs) at full power. Your jetpipe temps should be the same irrespective of the fuel being used , LPG should burn a lot faster and would normally produce the "lowest" temperatures, Cheers John |
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Post by azwood on Sept 11, 2018 2:57:39 GMT -5
Atleast she looks the part lol  |
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Post by racket on Sept 11, 2018 4:18:09 GMT -5
What pressure did you have coming out of the compressor at your 850C ??
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Post by azwood on Sept 11, 2018 4:20:32 GMT -5
What pressure did you have coming out of the compressor at your 850C ?? Not sure didn't have a gauge on it ill have one next test ill let you know. |
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Post by racket on Sept 11, 2018 4:25:56 GMT -5
OK, you might have been running at a low PR , its a large engine and a BBQ bottle isn't big enough to supply enough fuel for higher RPM , a barely self sustain RPM will have high temps .
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Post by azwood on Sept 11, 2018 8:03:47 GMT -5
That's true it was just at minimum rpm that it would self sustain OK, you might have been running at a low PR , its a large engine and a BBQ bottle isn't big enough to supply enough fuel for higher RPM , a barely self sustain RPM will have high temps . |
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Post by azwood on Sept 12, 2018 0:25:31 GMT -5
Need to make the jet nozzle it needs to be 65 to 68mm at the end doesent it
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Post by racket on Sept 12, 2018 0:41:20 GMT -5
Hi
Don't fit a jet nozzle yet , far too early in the development .
You need to run the engine without a nozzle to see what sort of temperatures the engine is producing at high power settings , then if they are "cool" (450-500C) , think about a nozzle and size it with consideration to the temps you've been experiencing .
Prematurely fitting a jet nozzle can result in a dead engine very quickly :-( ............the backpressure from the nozzle will reduce the pressure drop across the turb stage which will require higher temperatures to "compensate" , those higher temps need more fuel which may or may not be combusted efficiently resulting in flames at the turb wheel .
So please , go slowly , check that she can run up to high PRs on liquid fuel first , then if things are OK , think about the nozzle .
Cheers
John
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