Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Help with new Jett 426 engine

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Old 05-23-2011, 01:04 PM
  #1
jprge C.
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Default Help with new Jett 426 engine

Hello,
I have gotten my first Jett 426 engine. There is not instructions at all with the engine, is there anything special that needs to be done?

Also how do you set up the remote needle valve? Where should you locate it on the plane.

This is not user friendly for newer racers at all, workmanship is very nice, but no conventional backplate and no instructions is not what I expected. I knew it did not come with a firewall mount.

Jorge
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Old 05-23-2011, 01:37 PM
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Default RE: Help with new Jett 426 engine

Go to Jett's web site and it is all covered there.
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Old 05-23-2011, 01:59 PM
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Default RE: Help with new Jett 426 engine

I glue a piece of 1/8" aircraft ply about 1/2" wide by 1" long to the side of the fuse just behind the engine head. (head mounted at 3 O'clock when looking at it from the front). Then I drill and tap the holes in the wood to match the holes on the need assembly and bolt it to the side of the plane so the top of the needle clears the top of the fuse by about 1/2". Oh, make sure you fuelproof the wood with epoxy or paint.

I thought mine came with an instruction sheet. I'll check when I get home, but I may have tossed them.

Are you using if for a Q500 type plane? If so, take a 8.8" x 8.75 APC prop and cut a 1/2" off each tip for break in. He has break in info on his website, follow that and you will be fine.

Dub did a great job of creating the least expensive NICE motor for racing, I am thrilled with mine.
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Old 05-24-2011, 05:02 AM
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Default RE: Help with new Jett 426 engine

Dave,

3 O'clock from the front? or the back?

TW
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Old 05-24-2011, 05:12 AM
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daven
 
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Default RE: Help with new Jett 426 engine

Got me, yes, 3 oclock from the back, 9 oclock from the front, with the muffler down the bottom of the fuse.

thanks for catching that.
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Old 05-31-2011, 02:01 PM
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David Hill
 
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Default RE: Help with new Jett 426 engine

How is everyone setting up the fuel shut off?

David
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Old 05-31-2011, 06:40 PM
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Default RE: Help with new Jett 426 engine

Dub has a RNV that mounts to the rear muffler bolt, Way Cool.... lots easier set up !!!
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Old 06-01-2011, 06:10 AM
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Default RE: Help with new Jett 426 engine

Hi!
You can mount it like this...2-3mm epoxy-glas plate!
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Old 06-01-2011, 08:11 AM
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Default RE: Help with new Jett 426 engine

Jorge -

I have used the plywood plate on the right side of the fuse just behind the firewall, and I have also used the Jett exhaust bolt mount needle valve. The exhaust bolt mount is easy, but the other one isn't all that bad.

I've seen fuel shutoffs done by drilling out the hole in the square backplate mount that the throttle linkage was intended to pass through, and slightly chamfering the edge of the hole to avoid cutting the tubing.

Partially drill into the firewall behind that hole with the same bit (9/32 I believe is what they are using) so that a small wire loop can be pulled back into the hole with the cutoff servo.

Use the 3/32" ID Sullivan soft silicone fuel tubing, it's easy to squeeze shut. The small loop of wire will pull the tubing back into the hole, folding it over, cutting off the fuel flow. The shutoff is typically between the needle valve and the fuel inlet on the engine.

I'll see if I can get my friend to provide a picture if he has time. I also use the rotating barrel instead of the venturi. Flying on a grass field, it's nice to be able to shut the air intake prior to landing to help keep things cleaner.



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Old 06-01-2011, 09:59 AM
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Default RE: Help with new Jett 426 engine

fizz, do you have a pic of the exhaust bolt mount?

thanks,
V.
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ORIGINAL: fizzwater2

I have also used the Jett exhaust bolt mount needle valve.
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Old 06-01-2011, 10:12 AM
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Default RE: Help with new Jett 426 engine

Maybe I can get one tonight, but I don't have one with me right now.

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Old 06-01-2011, 10:14 AM
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Default RE: Help with new Jett 426 engine

Jorge,

There's a good pic here of the remote needle mounted on the ply behind the firewall, courtesy of Daven

http://www.rcuniverse.com/forum/m_10549023/tm.htm

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Old 06-01-2011, 12:08 PM
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Default RE: Help with new Jett 426 engine

There's a picture of the exhaust mounted one on an engine on the Jett website:
http://www.jettengineering.com/accy/remote.html


last picture, bottom right.
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Old 06-01-2011, 01:34 PM
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Default RE: Help with new Jett 426 engine

I may mount the next one under the wing inside the fuselage.

I have never had an easier to operate engine, certainly not one for racing. Just release the fuel line clamp, hook up the battery, and turn it with a starter. If the last run was good, the next one will be too. No need to even look at the needle once the engine is broken in and tuned up. From dry Phoenix air to 98% humidity in the swamps near KC, it ran the same setting.
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Old 06-01-2011, 01:37 PM
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Default RE: Help with new Jett 426 engine

Highplains - I can't remember - are you using the rotary "carb" shutoff, or the venturi?

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Old 06-01-2011, 01:49 PM
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Default RE: Help with new Jett 426 engine

Exhaust mount on my R-200.
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Old 06-01-2011, 08:08 PM
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Default RE: Help with new Jett 426 engine

Currently the rotary, but am planning on switching over to the venturi.
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Old 07-12-2011, 08:51 AM
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Default RE: Help with new Jett 426 engine

The following site shows how to convert to a venturi and add a 426 engine cut off:

http://www.nmpra.org/phpBB3/viewtopic.php?f=12&t=2826
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