karkano

Hi guys

i have problem with my ram 750 turbine, it does not want to make the propane combustion.after awhile i cheked all the connections and spark plug. I think the internal gas line might be pluged. If any one knows how to unplug the gas line without take apart the turbine please let me know. Or a diagram of the internal gas pipe. Thank you

Art ARRO

My Feedback: (5)

Karkano,
A couple things to check:
1. Can you smell gas at the turbine nozzle? If so, then the gas line is not plugged.
2. Do you have a full or new gas canister? Are you using propane or propane/butane mix?? Propane needs a regulator and the propane/butane needs to be warmed to above 70F or 30C to provide sufficent pressure.
3. Is the glowplug good and are at least 2 coils teased out of the plug cavity?? You can check by commanding a "Start" with the glowplug outside the turbine and grounded to the case with the gas and fuel lines disconnected. You should see a momentary,very bright orange/yellow glow on the exposed coils. If dim or dull red then the glow parameter must be changed-either raising or lowering the number depending on which version of the ECU that you have. The best glowplug is the Rossi R-8 followed by OPS RC-300 and McCoy MC-9 with no gasket. Each plug with have it own best glow parameter setting.
4. Is the ECU battery healthy and fully charged? I use a 2S Lipo of at least 2000 mAh capacity and 30C or higher. NiCds should be 6S 1500 mah or higher and fully charged,
5. You can also remove the starter and cowl to check the internal connection of the gas line to the turbine. If this connection is not secure or leaks then the turbine will not start on gas.
That's all I can think of for now but other RAM users may add to this. Good luck on getting a light off. This is the first step in the start sequence.
Rgds,
Art ARRO

karkano

art arro
first thanks for your great help, I checked all the steps you mentioned, butano gas only, spark rossi-8, two coils out of the glow plug, no gas leaks, with the glow plug out of the turbine, I found that does not work coil, I use my hand glow plug starter and run, I think my ecu is damaged

basimpsn

My Feedback: (5)

Make sure set your glow plug # between 35/40

Art ARRO

My Feedback: (5)

Karkano,
You can try a start with your glowplug starter but usually that is not enought voltage to give you the bright glow needed to fire off the butane. A glow driver with adjustable voltage is much better but leave it on for only a short period so not to burn out the plug. Also note, that some ECU's have you lower the number to increase the glow voltage and there are at least 3 different versions of ECUs for the RAM. On some of these the MOSFET driving the glowplug is easily blown resulting in no glow.
For "jungle rules" you can try lighting off the gas with a BBQ flame lighter held at the turbine nozzle. This will ignite and flashback into the turbine for a start. This is not recommended in a closed installation with a tailpipe, only with an open test bench setup. Have your extinquisher handy also.
Finally, you can have Carlos V. of RTI Technology service your RAM 750. He has done good work on my 750 and a FTE-500 turbine.
Rgds,
Art ARRO

Dr Honda

My Feedback: (4)

Art... I use a glow driver with my old AMT engines. Its not as positive of an ignition as a new ceramic igniter... but it works.

Bob price is the man behind the RAM ecu's. There's no reason to go though Carlos on an ECU.


Bob Price
206 Breakaway Road
Cedar Park, TX 78613
E-mail: [email protected]
Phone: 512-259-9232
Cell: 512-897-9770
Latest ECU version for RAM, FTE, and RTI turbines is R03B.

rjpmodel

My Feedback: (2)

What is the software Version of your ecu?
If you need it repaired or upgraded send it to me. If you send it to Carlos he will send it to me and it will cost you more.

Art ARRO

My Feedback: (5)

Karkano,
Send the ECU back to Bob Price, RJP Model Products, if you depermine that that is the problem. Bob has repaired and updated my RAM/FTE ECUs and they work great. Tony, aka Dr Honda, provided the contact information for Bob in a previous post.
Rgds,
Art ARRO

b.bixel

My Feedback: (123)

Bob's customer service is top notch. I sent my RAM 1000 ECU in for an upgrade and I had it back in less than a week (Washington State to Texas and back).

Regards,
Bart

karkano

My turbine is a 750f, I think it's one of the first versions, the ecu is black, gold sticker with black lettering, the start box is blue,, I think the ecu needs to be repaired because it does not work glow plug and fuel pump.
I will send to Bob for inspection

rjpmodel

My Feedback: (2)

Hi Karkano. That ecu is for the very first ones using air start built by Andy of Electrodynamics before I started making them. I designed and built all the auto start ECU's for RAM and FTE using RPM sensor rather than compression to control the turbine. Sorry but I don't now anything about fixing those. You might give Andy a call but I don't think he fixes them any more.
Bob

Art ARRO

My Feedback: (5)

Karkano,
Contact info for Andy Low is: www.electrodynam.com, Phone: 734-422-5420. If you click on their homepage, at the bottom is a direct link for an e-mail inquiry. Andy designed and built these early RAM ECU's and may be able to diagnose your problem or suggest a solution.
Good luck with your 750F.
Rgds,
Art ARRO

Ruizmilton

My Feedback: (29)

If an ECU is needed for the 750F I have oneI can sell to you, let me know if necessary

NUNU

Most likely its not your ECU...try this before you spend money you don't need to...first connect your glow plug back to your ECU then take a pencil torch/ butane torch and introduce that high intensity flame into the turbine nozzle, all while it is cycling to start.. If it fires then you know its not your ECU and most likely will be in internal problem..here is a link to a video I did on how to take the engine apart http://www.youtube.com/watch?v=yeOt4z3rtio. Conversely you can try placing a piece of paper or cardboard against the turbines exhaust nozzle to decrease the airflow..this works sometimes...let us know how these tricks work for you.

karkano

managed to start the turbine using butane torch but the thing is that the fuel pump wasnt supplying the fuel. My radio and ecu is configured properly. I know the fuel pump works good I hooked it up directly with 4.8v and it works. I think it might be my ecu.

NUNU

Also double check your rpm reading on startup..if it does not look quite right then the trick for that is to take a magnet and bring it in close proximity to the rpm sensor....to "defrag" the sensor (not sure if this is the correct term btw...but it does work)

basimpsn

My Feedback: (5)

Hey Nu I think he have the very old style ecu first design for airstart Ram 750 and use case pressure fuel tubing to control the pump speed. I think I have one somewhere but not sure if its good.

P.S
I would get rid of that old ECU and buy a conversion set from Bob Price or Xicoy..but you have to change the starter nut for one with built-in magnet.

http://www.xicoy.com/catalog/product...roducts_id=218

rjpmodel

My Feedback: (2)

The early RAM ecu's designed by Andy Low did not have an rpm sensor. The engine was controlled by compression pressure. I designed the rpm sensor with the magnet in the front compressor bullet nut to control the engine using rpm rather than compression pressure. I also designed the auto start system.

NUNU

Nice..didn't know that about those early models..very interesting..thanks Basimpsn and rjpmodel

karkano

hi guys, talk to andy low yesterday, but I had no luck, no more these ecu repairs. I wonder if Mr. Ruizmilton or basimpsn have available the ecu

basimpsn

My Feedback: (5)

I might have one lying around but not sure if it's any good but I will still look for it.... Can you explain your start sequence?.. If I remember correctly

(1) make sure scuba tank and propane fully charged, (2) make sure ecu responding to TX throttle command, also check the thermocouple reading is about 28f on start box.

This start sequence was copyed.."You should push the ign buton first...then bump the air and crack the propane. Once it "pops" - starts, open the propane and air slowly but simultaneously as you can blow out the flame with too much air. At the Fuel Ramp statement you should have both air and propane open fully. Lastly it should state "running' before you should disconnect"

karkano

Hi, I have replaced the scuba tank for an electric starter as suggested by one of the users in the forum and it works good and the throttle commands work properly. I can get the turbine to start with the propane but the fuel pump doesn´t send the fuel to the turbine to keep it running. on the start box it show the word "running".

Gene9

I have recently received a ram 750. I have downloaded the manual but it does not have the pics. Is there somewhere I can get a full copy of the manual. New to turbines! Is there someplace to get repairs done if needed.

Dr Honda

My Feedback: (4)

Here's the Modelbau manual. It's the most current version, but since we don't know what you have... it may not be what you need.

Gene9

Thank You. From the best I can tell it's an earlier Ram Jet 750. Not the 750A. Still has all the original starter box and ecu
.