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1300 Starting Gas and quesiton

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1300 Starting Gas and quesiton

Old 08-29-2015, 08:21 AM
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ivesdo
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Default 1300 Starting Gas and quesiton

I have been using external propane for many years with my Simjet turbines. When I recently acquired a PST 1300, I didn't' receive any of the internal gas parts other than the solenoid valve. I continued to use propane for starting and the only difference I noticed was a need to turn my regulator valve full open in order to get the EGT up for a kero ramp. That along with multiple starts to get the temp up. I am using a regulator from GREAT Northern Hobbies (now defunct) but similar to what DreamWorks (Todd) sells. Since I am already using external propane, I would prefer to continue with that gas, unless it is ill advised. The problem is, now that I have replaced the EGT Thermocouple, it seems to take about four or more starts with propane in order to get the temperature up. The TC is 2mm into the cone and if I move it much further in, I get over temperature shutdowns as might be expected. I replaced the TC due to over temperature shutdowns right after take off. I am using the older TEMS ECU.

Is Propane ok to use, externally only ?
Should I do something to increase the flow of propane ?
Should I purchase DreamWorks regulator ?

What are the thoughts about this ?
Old 08-29-2015, 09:01 AM
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One more piece of information. If I start without the gas valve in line, I seem to get enough flow of propane with my regulator turned all the way open to get the EGT temp up on the first start. I start with my regulator open two clicks and then open it full during propane start to get the EGT temp up. I'm inclined to open up the fitting (a couple of drill sizes) between the valve and the line to the engine in order to increase the flow to the turbine.

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