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Norvel .061 Questions - 8/6/2002 6:34:24 PM   
PAINLESS


 

Posts: 360
Joined: 5/7/2002
From: Los Alamos, NM, USA
Status: offline 		I just picked up this engine for a scratch built 1/2 A pylon racer. I followed the instructions and let the cylinder soak overnight then spun it over with a small starter, the engine has a real good feel to it now when hand flipping it. Although I have not started it yet.

How many head shims should I run? It came with 2 installed. I'll be using 25% fuel.

I know you can use a Cox glow head on these, do you need to add or remove head shims when making the switch? I have several of these and would only use one if I blow the original.

Anyone use the cover plate with the pressure fitting? I thought I read somewhere that this worked better than muffler pressure, I don't need a muffler where I fly.

And last, how do you post a photo with a thread? I'd like to post one of the finished plane, which should be done this week.

Thanks in advance.
       Post #: 1

Norvel .061 Questions - 8/6/2002 9:48:12 PM   
2fast4u



Posts: 932
Joined: 3/2/2002
From: LITTLE ROCK, AR, USA
Status: offline 		Start with the 2 shims in place that came with it. After you have run it a while, feel free to pull one out and see what you think.

I run the pressure tapped back plates on the NON R/C Norvels. They really work well, but you have to be careful not to flood the engine. I use a clamp on the pressure line....after I start spinning the engine with the starter, I have a buddy pull the clamp and it starts. If you don't clamp the pressure line, the engine will almost always flood and lock up. Then you have to pull the head and drain all the fuel out of it and start over.

If your running R/C (throttle), you almost have to run the muffler pressure, because the engine will not run consistently on case pressure. The pressure feed is too great at low rpm and you will end up fighting it all the time.

As for the Cox heads, I have never done that, but I do know that they lower the compression in the cylinder. With real clean fuel (NO BYRON'S) your Norvel plug will last a long time. My R/C .061's keep the same plug for the full flying season most of the time. That is with 25/20 fuel. I also recommend their NO RUBBER fuel filler syringe. There is something about using a rubber fuel bulb that eats up plugs.

When it comes to lubricant in the fuel......Who cares!! As long as there is plenty of it!! I use 100% Synthetic, others use castor, others use a mix. I have never had a problem with Full Synth. That's about all I can tell you on that.


_____________________________

FLY IT LIKE YOU STOLE IT!

(in reply to PAINLESS)
       Post #: 2

Norvel .061 Questions - 8/6/2002 10:58:23 PM   
PAINLESS


 

Posts: 360
Joined: 5/7/2002
From: Los Alamos, NM, USA
Status: offline 		I have the CL version, so it will be running wide open all the time. I ordered the cover plate with nipple but haven't got it yet. I was going to run the pressure line straight thru the fire wall, making it hard to pinch it, I'll have to rethink that. Have you tried a restrictor in the line to limit pressure?.

I've got some Sig 25% fuel, don't recall off hand what the oil percentage is or the blend.

I will measure the head clearance just to see what it is before I start removing and/or adding shims.

(in reply to PAINLESS)
       Post #: 3

Norvel .061 Questions - 8/6/2002 11:59:45 PM   
2fast4u



Posts: 932
Joined: 3/2/2002
From: LITTLE ROCK, AR, USA
Status: offline 		This is just me.......If you run the pressure line straight through the firewall, you will have to meter the fuel going in, or it will shoot out the vent line, through the fuel line and right into the case. Your already flooded. See how easy that was!! I ended up with a T in the line, and I clamp it between the engine and the T to fuel and start. You will figure it out, it's not rocket science. Besides, it's fun to try new ideas, sometimes they work!


_____________________________

FLY IT LIKE YOU STOLE IT!

(in reply to PAINLESS)
       Post #: 4

Norvel .061 Questions - 8/7/2002 1:10:43 AM   
PAINLESS


 

Posts: 360
Joined: 5/7/2002
From: Los Alamos, NM, USA
Status: offline 		You're right, if I used a electric pump or bulb I would flood the engine and not realize it till it was too late. If I use my graduated syringe I can put in a measured amount, something less than 1 oz, and keep it from flooding the engine. I'll figure it out now that I know what to watch for.

There just wasn't a lot of room to run the line out between the engine and mount. I'm using the mount from Norvel.

(in reply to PAINLESS)
       Post #: 5

It's .061 Time!! - 8/7/2002 4:55:12 AM   
Jeff Leavitt


 

Posts: 260
Joined: 6/27/2002
From: Salt lake City, , UT,
Status: offline 		Painless,

You are right on measuring your headspace. I've had good luck with about .012-.013 total and plugs will last o.k. with the head set there.

I use crankcase pressure on my racers and my pressure ling goes straight from the pressure nipple through the firewall to the tank. I use a graduated syringe to fill my one oz. Sullivan tank. I never fill it much beyond 3/4 oz. so there is no danger of flooding. Besdes, you need a little air space in the tank so there is some room for pressure to normalize when the engine starts. If the tank is too full there's no room for pressure. You'll set the needle, launch the airplane, then as soon as some fuel is burned off pressure will come up in the tank and the engine will go rich. You won't like that! Also, don't use that real small tubing on the fuel side of the tank. Use some "AeroTrend small size" it isn't small. But that's what you want. Fill the tank, and spin it with the starter. Case pressure in the tank will start the fuel coming and she'll start. Worlds simplest starting procedeure. You'll also find that after you set the needle for the first flight of the day, you won't have to set it again. Start it, it will run a little rough till it gets warm and the pressure stabalizes then it will straighten right out.

Sig fuel is usually half castor and half synthetic and that has worked pretty well for me in the past. Should work o.k...
Good Flying.......

Jeff Leavitt

(in reply to PAINLESS)
       Post #: 6

Norvel .061 Questions - 8/7/2002 5:31:49 PM   
2fast4u



Posts: 932
Joined: 3/2/2002
From: LITTLE ROCK, AR, USA
Status: offline 		I'm going to try the straight shot to the pressure fitting thing. My problem has been that if I don't clamp the pressure line, my engines flood as soon as I set them on the table. The fuel just runs into the case from the tank before I can get ready to start it. Oh well, my way works great, but I am always ready to try something new/better.


_____________________________

FLY IT LIKE YOU STOLE IT!

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       Post #: 7

Norvel .061 Questions - 8/8/2002 12:12:29 AM   
PAINLESS


 

Posts: 360
Joined: 5/7/2002
From: Los Alamos, NM, USA
Status: offline 		Should have waited....I put the pressure line thru the side of the fuselage last night. I'm going to put a groove in the motor mount so the line doesn't get pinched between it and the engine.

The Sig fuel I bought is 25% nitro, 20% oil, 50/50 caster and syn.

I should have the plane done tonight, and then will start breaking in the engine.

(in reply to PAINLESS)
       Post #: 8

Norvel .061 Questions - 8/8/2002 12:29:09 AM   
RandyL


 

Posts: 367
Joined: 2/1/2002
From: Silver Lake, KS, USA
Status: offline 		What is the correct prop for one of these .061 with muffler and throttle? I have one on a miniature Kadet airframe. Ran it a couple of times a few years. Since then I have heard about different cylinders, shims, glow heads, etc. Mine ran but I never did know the proper RPM or prop.


_____________________________

Randy
Flying the Friendly Skies of Kansas

(in reply to PAINLESS)
       Post #: 9

.061 notes - 8/8/2002 5:50:50 AM   
Jeff Leavitt


 

Posts: 260
Joined: 6/27/2002
From: Salt lake City, , UT,
Status: offline 		2fast,

Are you running a restrictor in the pressure line? You need a restrictor as close to the engine as you can get it with a .016-.018 hole in it. I use a little gizmo I call a "Pill" It's a piece of weed wacker monofilament line 1/4" long and .195 in diameter. I drill the small hole through it the long way, and slip it inside the pressure tubing as close to the pressure tap on the engine as I can get it. To fill the tank use a graduated syringe so you don't overfill. Turn the crank to open the venturi port then fill. When the tank is filled, set the airplane nose up so gravity won't flood the engine. Don't flip the engine over as it will pressurize the tank and flood it. It is important to have a fairly large size tubing on the fuel side of the tank. Give this a try, you'll love it!...

Randy,
The Norvel instructions recommend a 6x3" prop. APC makes a 5.7x3 thats pretty good prop. Generally speaking, The Norvel's don't like a lot of prop. They are timed to develop their power at high RPM and they won't pull a lot of prop at high rpm. If you do get them over proped, they will heat up and go lean giving you a bad run. I don't run mufflers so I can't give you any specific numbers. Good flying.... Rgds,.... Jeff.....

(in reply to PAINLESS)
       Post #: 10

Norvel .061 Questions - 8/8/2002 6:41:07 AM   
RandyL


 

Posts: 367
Joined: 2/1/2002
From: Silver Lake, KS, USA
Status: offline 		Jeff, Thanks for the heads up on the prop. I use a lot of APC in my flying. I'll get a couple and try them this fall. The current fad at the field is flying the " 049 stuff" so I was wanting to drop a couple of servos in and fire it up again. I found this thread at the perfect time.

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_____________________________

Randy
Flying the Friendly Skies of Kansas

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       Post #: 11

Norvel .061 Questions - 8/11/2002 4:07:08 AM   
PAINLESS


 

Posts: 360
Joined: 5/7/2002
From: Los Alamos, NM, USA
Status: offline 		Testing to see if I can attach a photo.

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       Post #: 12

Norvel .061 Questions - 8/12/2002 6:39:55 PM   
2fast4u



Posts: 932
Joined: 3/2/2002
From: LITTLE ROCK, AR, USA
Status: offline 		Sup Jeff Leavitt? I run regular 1/2A fuel line with no restrictions. My little .061's turn a 5x4 Tornado at around 24K with 25/20 fuel. I also run Norvel pressure tapped back plates, the hole is VERY small in the nipple, but it really works well, too well sometimes.


_____________________________

FLY IT LIKE YOU STOLE IT!

(in reply to PAINLESS)
       Post #: 13

what is that? maybe a hummer - 8/12/2002 6:56:06 PM   
mack mcnerney


 

Posts: 7
Joined: 8/10/2002
From: cocoa florida
Status: offline 		[QUOTE]Originally posted by PAINLESS
[ B]Testing to see if I can attach a photo. [/QUOTE]

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       Post #: 14

Norvel .061 Questions - 8/12/2002 6:58:21 PM   
mack mcnerney


 

Posts: 7
Joined: 8/10/2002
From: cocoa florida
Status: offline 		first post not a geek at this i think you could call this a test. i hope it works. ps glan to be here.

(in reply to PAINLESS)
       Post #: 15

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