samuelx

Hello
I just bought a new motor IR 40 front in rear out.
Where to put preasure niple?
How to run it in?
What prop to use on competition?
I have many CF props, what is the right diameter.

Is this nessesery what i find here:
http://home.kabelfoon.nl/~fiorimet/Running.htm

Ed Smith

The I.R. .40 is meant for tuned pipe use with FAI fuel (20%castor, 80% methanol). This engine is a high performance racing engine, not an everyday sport engine. What do you intend to use it for?

The pressure fitting should be fitted to the pipe. The pipe probably has a thin wall, therefore it is not possible to screw the fitting straight into the wall. There are two methods. Drill a hole in the pipe to clear the body of the fitting. Put a nut on the end of the fitting and attempt to thread the fitting from the inside through the hole. Then secure with a second nut. Believe me this is a real test of ones patience.

The preferred method is to get somebody who knows what they are doing to put a blob of aluminum weld on the outside of the pipe at the fitting position. The blob needs to be at least 4mm thick. Then drill and tap the pipe. Position of the fitting does not seem to be important from a performance standpoint. However all of my pipes broke when the fitting was close to the header. I moved the fitting to the where the pipe had the largest diameter, or thereabouts.

This engine will need to run at about 27,000rpm. Start with a prop about 7.4" x 7.5" pitch and go from there. Do not use any sport type propellers. Use only continuous strand epoxy/carbon molded props.

Ed S

samuelx

Thank you for your quick answer.
My english is bad but i hope that you understund what i mean....
I have been racing Q500, F5D and F5D 400 here in Finland.
I also have F3D stiletto Whit mvvs Grrt-r engine.
I have been flying that plane manytimes and now the motor is "end"
I bought this IR motor to this plane.

Here in Finland I am alone whit my F3D. So i try to have help here
I just start cleaning the engine. Afther that i try to put the preasure niple as you say.
There was some spare parts whit the motor "shims"
i dont know how to make the COMPRESSION right.
How many shims do i have to put in?

bl10

You might do better at this sight:

http://groups.yahoo.com/group/faipylon/



Barry

Ed Smith

If possible measure the engine as supplied to you. Measure the "Deck Height" that is the distance from the top of the sleeve to the top of the piston when the piston is at Top Dead Centre (TDC). Measure the distance that the squish band protrudes into the sleeve with the shims as supplied. Subtract this distance from the deck height and you will have the head clearance. One would assume that the supplied engine would be set up close to ready to run. Please excuse me if I am being too basic, I do not know how familiar you are with engine set-up.

Without knowing what the I.R. set should be I can offer only the following. I use the Nelson F3D motor. The basic factory setting is, deck height 4.95mm, head clearance 0.635mm. These are starting points. They are altered depending upon pipes and props etc.

I hope this helps.

Ed S

samuelx

Thank you for you help.
I got the preasure niple on place.
Now i try to find someone how can tell me the right compression.
I write to: http://groups.yahoo.com/group/faipylon/
Maby there is someone how use IR motor....

Here you can find some Finnish pylon pictures:
http://jasenet.lennokit.net/samuel.riippa/Kuvia/

Per_N

Maybe to late, but you have to place the nippel at the right place. You can't just make a hole somwhere in the pipe.
I can't remember the meassurement but put a question on the Yahoo group, somebody wil know.

Regards Per

samuelx

I just measure my Nelson .40 FIRE. It´s used engine, not new.
The deck hight is 5,05mm (there is 1 shim under the sleeve)

Without shim´s it´s 4,95mm
I measure the head without any shims its 4,45mm
4,95-4,45= 0,5 The head clearance is 0,5mm IS THIS MEASUREMENT RIGHT??

I measure the engine whit all the shims (like it was delivered to me)
Deck hight 5,05
Head hight 4,2mm (4stc shim´s)
5,05-4,2=0,85mm The head clearance is 0,85mm


Is the basic factory setting good starting point, deck height 4.95mm, head clearance 0.635mm.
I am using:
standard Nelson pipe
Nelson plug (not glow bee)
7,5"x 7" prop ( epoxy/carbon molded prop)

I am not familiar with engine set-up ANY INFORMATION IS WELCOME

Per_N

I think the smallest clearance on this motor is 0.42mm. But the basic way is too measure the volume. You need a very small syringe. You should have about 0.5 to 0.53cubic ml.