Jet Central Turbines - Artes Jet Jet Central Turbines formerly the Artes Jet forum

JC Experts please reply...

Reply

Old 03-28-2013, 07:22 PM
  #1  
jzuniga
Senior Member
Thread Starter
My Feedback: (7)
 
Join Date: Dec 2001
Location: Gig Harbor, WA
Posts: 524
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default JC Experts please reply...

Ok, I've emailed Eric two times in the last couple of days and no replies? must be busy, so I thought I'd ask some experts here...

Super Eagle:

Lately it seems to almost get a "hung" start? As in slow in spooling up after light off. What should the Gas start settings be? I'm at 25%. Is this normal? or too low?

Next, how do I remove the cowl? I've removed the screws but it wouldn't budge. I didn't want to force it. Is there a trick to getting it off? I need to get it off cause I need to replace the fuel tubing, since mine is too short. Or rather, this brings me to the next thing: Is this ok? Festo being this close to the turbine and a bend right after? See pic:

Thanks...

Z
Attached Thumbnails Click image for larger version

Name:	Bz77252.jpg
Views:	42
Size:	74.5 KB
ID:	1867655  
jzuniga is offline  
Reply With Quote
Old 03-29-2013, 07:07 PM
  #2  
RONW
Member
 
Join Date: Apr 2002
Location: Auckland, NEW ZEALAND
Posts: 86
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...


ORIGINAL: jzuniga

Ok, I've emailed Eric two times in the last couple of days and no replies? must be busy, so I thought I'd ask some experts here...

Super Eagle:

Lately it seems to almost get a ''hung'' start? As in slow in spooling up after light off. What should the Gas start settings be? I'm at 25%. Is this normal? or too low?

Next, how do I remove the cowl? I've removed the screws but it wouldn't budge. I didn't want to force it. Is there a trick to getting it off? I need to get it off cause I need to replace the fuel tubing, since mine is too short. Or rather, this brings me to the next thing: Is this ok? Festo being this close to the turbine and a bend right after? See pic:

Thanks...

Z
Hello Z

While waiting for a reply from JC I will reply as I have this engine as well.

Hung starts and slow ramping in the ramp stage, in my experience, are usually caused by either a weak or slipping starter motor or weak gas supply. That is if the ECU has the correct settings.
I am not sure if you mean you have a 25% gas restriction or 25% gas flow which sounds very low to me if that is the case.
The front cover should come off after you remove the securing screws and FOD screen, if you use one, but can be a bit tight.
Best not to do much until you hear from Eric just in case.

Ron
RONW is offline  
Reply With Quote
Old 03-29-2013, 08:20 PM
  #3  
jzuniga
Senior Member
Thread Starter
My Feedback: (7)
 
Join Date: Dec 2001
Location: Gig Harbor, WA
Posts: 524
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

Thanks for the reply Ron...

The 25% I'm referring to is the "Start Gas Adjust" sub menu per the HDT. I've talked to other Jet Central users and one told me he uses 70%!?... So I'm thinking I'm low on the starting gas. I'll give the cowl another try some other time. I'm thinking that the bend in the fuel line is not too bad so it should not cause any issues. Seems to run fine as is and no air bubbles ;-)

Z
jzuniga is offline  
Reply With Quote
Old 03-29-2013, 08:31 PM
  #4  
noahb
My Feedback: (67)
 
Join Date: Jan 2002
Location: Carlsbad, NM
Posts: 1,304
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

If the turbine use to start fine, but as you indicated lately you are having it hang, the first thing I would do is remove the gas line (with the restrictor) and then blow air back out the restrictor. That restrictor is the little brass thing in the yellow line. Sometimes they will get a partial plug and this limits your gas supply. Hope this helps.
noahb is offline  
Reply With Quote
Old 03-29-2013, 08:33 PM
  #5  
noahb
My Feedback: (67)
 
Join Date: Jan 2002
Location: Carlsbad, NM
Posts: 1,304
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

If you find that the restrictor is free, then slowly increase your gas % a couple points at a time. If you notice an improvment in starts, then you are heading in the right direction.
noahb is offline  
Reply With Quote
Old 03-29-2013, 09:16 PM
  #6  
jzuniga
Senior Member
Thread Starter
My Feedback: (7)
 
Join Date: Dec 2001
Location: Gig Harbor, WA
Posts: 524
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

Thanks Noah...
The restrictor is brand new from Eric, has only two starts on it, but I'll check it...

Z
jzuniga is offline  
Reply With Quote
Old 03-30-2013, 10:21 AM
  #7  
noahb
My Feedback: (67)
 
Join Date: Jan 2002
Location: Carlsbad, NM
Posts: 1,304
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

try increasing the gas % a few points and see if that starts to help.
noahb is offline  
Reply With Quote
Old 03-31-2013, 04:24 PM
  #8  
BluFox
My Feedback: (10)
 
Join Date: Jan 2002
Location: North Port, FL
Posts: 1,107
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

Hello:

Those who have responded, have given good advice. During the start sequence, if the propane lights but the turbine does not go into preheat, then fuel ramp, you will receive an Error Code stating: Time(ed) OUT. This means there was not enough propane or gas getting to the chamber so as to allow the temperature to rise 60 degrees higher than the starting point temperature. If this is the case, increase the gas setting 5 points at a time until you get the required propane/gas flow to the combustion chamber allowing the turbine to continue the start sequence.

As for removing the front cover (?) once you have removed the 3 screws, lightly tap on the cover with a rubber handle tool. . .this will "Pop" the cover loose. It is a very snug machine fit. Once under the cover, follow the gas line to the 90 degree Festo. If the 90 degree Festo is compromised and has a burn through hole, the turbine will not start. If this is the case, this condition is caused by a pressure loss due to a connection which has allowed a leak. Heat from the combustion chamber then travels back toward the gas solenoid and will burn components as it travels.

I trust this helps.

Regards,
Eric



BluFox is offline  
Reply With Quote
Old 04-02-2013, 01:00 PM
  #9  
jzuniga
Senior Member
Thread Starter
My Feedback: (7)
 
Join Date: Dec 2001
Location: Gig Harbor, WA
Posts: 524
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: JC Experts please reply...

Thanks a lot for the reply Eric...

That should do it.

Z
jzuniga is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service