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Can a Cox .049 Tee Dee run left-hand? Cox_ba12




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Can a Cox .049 Tee Dee run left-hand? Empty
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Can a Cox .049 Tee Dee run left-hand?

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Can a Cox .049 Tee Dee run left-hand? Empty Can a Cox .049 Tee Dee run left-hand?

Post  Cox International Fri Mar 17, 2023 12:15 pm

Is it possible to run a Cox .049 Tee Dee "backwards", even poorly, if the crank is not changed to a left-hand version?

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Can a Cox .049 Tee Dee run left-hand? Empty define "poorly"

Post  cmulder Fri Mar 17, 2023 3:04 pm

Yes i have had engines run backwards.
They barely ticked over but kept running.
Most common if the engine is almost flooded.
One way this happens is when the engine is flipped to slow by hand and the engine fires back and keeps running.
The rpm is far to low for any meaningfull trust (even with the correct rotation propellor)

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Post  Cox International Fri Mar 17, 2023 3:30 pm

cmulder wrote:Yes i have had engines run backwards.
They barely ticked over but kept running.
Most common if the engine is almost flooded.  
One way this happens is when the engine is flipped to slow by hand and the engine fires back and keeps running.
The rpm is far to low for any meaningfull trust (even with the correct rotation propellor)


Thanks and that's what we figured.

Someone bought an engine on eBay. After our OP the chap messaged that the engine runs well LH but "rough" RH. Just wanted to give him a reliable answer.

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Post  944_Jim Fri Mar 17, 2023 4:11 pm

And here I was hoping to see a run of left hand cranks. Oh well.
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Can a Cox .049 Tee Dee run left-hand? Empty close the fuel line

Post  cmulder Fri Mar 17, 2023 6:08 pm

Cox International wrote:Thanks and that's what we figured.

Someone bought an engine on eBay. After our OP the chap messaged that the engine runs well LH but "rough" RH. Just wanted to give him a reliable answer.

The ways i happend on mine is when fuel pools up in the crankcase and the engine runs on that.
The air intake timing is wrong so the engine is getting only a little air.
In a way its like ideling on a rc carb and then verry rich.

When this happens one easy way to cure it is to either pull off the fuel line or pinch it to stop any aditonal fuel entering the engine and let it run dry backwards.
You can also close the needle but then you need to keep count to open it back to the right position once dry.
Then try to restart without priming and if that does not work (fast enough) close the needle a little and prime.

All above asumes its coused by fuel pooling in the crankcase other ways might also be possible.
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Post  Yabby Fri Mar 17, 2023 7:37 pm

I have found similar, that when I accidentally flood a TD 049 it will backfire and the spinner will come off. I have not had it actually run backward, but it certainly fired at the wrong time and backfired. Once the flood is gone the engine runs fine. I run hard tanks and find that its important the tank and engine NVA be alligned properly and when fueling, I squeeze the fuel line so as that none goes into the engine, then very light prime of the cylinder, turn the prop and suck the fuel up to the venturi and it will start very easily. But if you flood the engine it will backfire, especially if you have a very good battery and good glow plug. backfiring of the sort I described is an attempt to run backwards, but the crank timing should prevent it from actually running, though it seems some have had them run backward very poorly as would be expected as the crank port timing is completely wrong for running backward.
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Can a Cox .049 Tee Dee run left-hand? Empty bumping against the compression

Post  cmulder Fri Mar 17, 2023 8:13 pm

One critical condition for it to happen is that the engine is just bumped against compression allouwing it to fire and kick back.
Most common this happens when the flipping of the prop is to slow/weak.
And when you experience this condition, you can also use it by bumping the prop the wrong way so the engine fires back in the right direction.
Casually twisting the spinner with your thumb and index finger makes for good bragging rights when it starts that way.

This bumping and back fire is also how i hand start my saito four stroke engine.
Its a vicious bastard when it comes to backfireing (is that a word?) and for trowing props.
For that reason its fitted with a split nut that is locked in place.
ALso always use a chicken stick on it and durable graupner props (apc might be to brittle and sharp)

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Post  944_Jim Fri Mar 17, 2023 8:36 pm

cmulder wrote:
Casually twisting the spinner with your thumb and index finger makes for good bragging rights when it starts that way.

Now I see why they are called spinners. Laughing

SNAP says my fingers. Brappp says the engine. I like it when will fire right up that way.
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Post  Ken Cook Sat Mar 18, 2023 5:40 am

For my 4 strokes and other engines that have a tendency to loosen the prop, I make sandpaper discs glued back to back with a hole in the middle and place it on the drive washer prior to installing the prop. No more loose props, I've never had one loosen since doing this.
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Post  Oldenginerod Sat Mar 18, 2023 5:59 am

cmulder wrote:
This bumping and back fire is also  how i hand start my saito four stroke engine.
Its a vicious bastard when it comes to backfireing (is that a word?)

OS recommends that I start my FS.60 that way.  It's true.  It starts much easier on the reverse bump than flicking through compression.  I'd just about mastered starting it with one bump, but next time I ran it I had an audience and it refused to fire.  I panicked and without thinking gave it a big flick through compression and paid the price.  That 12" wooden prop bit really hard, taking a chunk of my finger through a leather glove.  I won't do that again.  Time to get a new insert for my starter.  Embarassed
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