Merlin 140XBL starting issue
06-01-2018, 07:10 PM
#1
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Location: Kamloops, BC, CANADA
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Merlin 140XBL starting issue
Just throwing this out while we are waiting on a couple of call backs.
I have a JetsMunt Merlin 140 XBL with the JetsMunt version of the Xicoy ECU. This is the one with the 3 wire interface to the turbine.
During the start sequence the temperature reading drops from ambient to 0 as soon as the throttle stick is dropped to begin the sequence. The burner lights and fuel flows but the temp stays at 0. As a result, the start fails sometimes with a flooded engine.
I have a brand new 2S 4000 mAh 50C ECU LiPo battery and I am told the igniter voltage was raised 0.2V from standard.
Everyone I have spoken to tells me the temperature indication should start to rise from ambient as soon as the fuel ignites.
It is acting to me like a buggy version of the ECU software.
Anyone else experience this and if so how did you resolve?
Thanks
-Rob-
I have a JetsMunt Merlin 140 XBL with the JetsMunt version of the Xicoy ECU. This is the one with the 3 wire interface to the turbine.
During the start sequence the temperature reading drops from ambient to 0 as soon as the throttle stick is dropped to begin the sequence. The burner lights and fuel flows but the temp stays at 0. As a result, the start fails sometimes with a flooded engine.
I have a brand new 2S 4000 mAh 50C ECU LiPo battery and I am told the igniter voltage was raised 0.2V from standard.
Everyone I have spoken to tells me the temperature indication should start to rise from ambient as soon as the fuel ignites.
It is acting to me like a buggy version of the ECU software.
Anyone else experience this and if so how did you resolve?
Thanks
-Rob-
06-02-2018, 09:22 AM
#3
I suggest turning on the system to pre start mode and read the TC ambient temp on the data terminal , then with a heat gun hit the thermocouple at the exhaust , if the temp rises the TC is good
Next run the stick up & down to go into start-up sequence , if the data terminal goes strait to zero instantly you can then take it that the ecu is having issues
Another check is to see if there is a high resistance crimp on the 3 wire connection cable that leads from the ecu to the turbine
Next run the stick up & down to go into start-up sequence , if the data terminal goes strait to zero instantly you can then take it that the ecu is having issues
Another check is to see if there is a high resistance crimp on the 3 wire connection cable that leads from the ecu to the turbine
06-12-2018, 01:59 PM
#4
06-13-2018, 04:47 PM
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Just to close out this thread, I did hear back from Gaspar and he feels the problem is with the thermocouple. Albeit not that it is broken but rather the insulation / installation has been compromised. It does require changing out so the engine is off to be repaired.
