cox pee wee and .010 question

colibriguitars on Fri Jul 13, 2012 1:00 am

Hi everyone!

Well i have problems with two of my motors, first, my pee wee, who is used, with good compression, doesn´t get the top speed, Can this could be if the o´ring in the tank is damaged, because i have examinated all, and it looks ok.

my second Question, my cox .010 tee dee has a new ventury body made with aluminium (not the original) and it doesn´t have a spring starter, so... can i install a spring starter in this kind of ventury body?,,, today a tried to started just with the finger, and i did not get started. in this same way, the little engine has good compression, everything clean and i noticed an small "scratch or hole or dent " between one of the exhaust port and one of the bypass port. if this mean that de cillinder is dead or it can run? just to know if is time to find a spring starter (if it fits)

Thanks for the help and sorry for my bad english

cribbs74 on Fri Jul 13, 2012 8:10 am

TD's of any size can be tricky to start. A spring is helpful but, not needed. I don't think you can use a spring with the aluminum bodies unless modified.

Not sure about the "dent" a picture would help.

SuperDave on Fri Jul 13, 2012 11:17 am

guitars:

#1: Yes, the venturi gasket MAY be defective. Replace it with a new one. They tend to deteriorate over long periods of time. Has this engine ever run well for you in the recent past?

#2: Does the engine even try to start? Suggest the engine be examined by someone knowledgeable with Cox engines. Has this engine run for you in the past?

Did you purchase these engines new or used?

**nitroairplane** on Fri Jul 13, 2012 3:02 pm

Well the Alu bodies do not have the pressure valve (and starter spring hook) but I am sure you could drill it a bit then JB weld a thick enough piece of wire on.

John Goddard on Fri Jul 13, 2012 4:24 pm

I didn't think it would work but it does.
As you can see the hook that normally slips over the pressure tap just sits snugly
under the venturi moulding.

Very Happy

I don't got no 010 Ally so I don't know about the 010's

colibriguitars on Fri Jul 13, 2012 11:37 pm

well, watching the pictures, i think it is possible, so... And, about starting the engine, well, it starts, but immediately stops. here the pics of the damage in the cilinder...

colibriguitars on Fri Jul 13, 2012 11:39 pm

as you can see, the damage is on the right side of the exhaust in the first picture... and, yes, i get this one used Sad

thanks for the help, that TomThumb is waiting for a running engine!

**nitroairplane** on Sat Jul 14, 2012 4:23 am

colibriguitars wrote:as you can see, the damage is on the right side of the exhaust in the first picture... and, yes, i get this one used

thanks for the help, that TomThumb is waiting for a running engine!

Tom thumbs are lovely but be careful as it could be a handful with the .010 so run it rich and prop on backwards, the plane was designed for the Bambi and that had considerably less power than the .010!

ahrma_581 on Sat Jul 14, 2012 12:03 pm

John Goddard wrote:I didn't think it would work but it does.
As you can see the hook that normally slips over the pressure tap just sits snugly
under the venturi moulding.

Looks from the picture like the spring is going to EAT the prop bigtime. Just sayin'...

ahrma_581 on Sat Jul 14, 2012 12:13 pm

colibriguitars wrote:as you can see, the damage is on the right side of the exhaust in the first picture... and, yes, i get this one used

The PeeWee that was on my ebay Lil Sticker had a similar chinga on the side of the exhaust port. Once I eased the burr down with a round India stone, (and overhauled it) it started and ran fine. The transfer is actually venting into the side of the exhaust there, but the mixture loss isn't enough to affect how it runs.

So, unless that is a huge gouge, it probably isn't the reason it won't start. More likely the usual suspects: weak glow battery, clogged venturi, tank at wrong level, worn out piston/cylinder...

gcb on Sun Jul 15, 2012 10:55 am

colibriguitars wrote:...And, about starting the engine, well, it starts, but immediately stops.

OK, it appears that it will run off a prime. I would remove the needle valve assembly and squirt some fuel in the fuel line side to see if it gets past the needle OK. Next see if the holes in the venturi are open or perhaps clogged with castor. If they are clogged, you can clean them GENTLY with a needle or pin. Make sure you do not enlarge the holes.

Or a quicker but less exacting way to accomplish the above is to hold the engine venturi down and squirt fuel into the fuel line nipple and see if fuel comes out.

Of course make sure the needle is adequately open when doing either process.

Good luck with it.

George

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