PEE WEE help?

You know.. I never considered that XP as foolish as it sounds. Im really happy with my purchase if anything, the guy seemed to know exactly what he was selling. it even has one of the 3rd party 1/4 inch glow plug adapters! next up to buy is a testing stand and mounting bolts. im tired of the board i have my .049 bolted to (quite frankly is scares the... well you know).

SS

SS:

Since a .020 in no "powerhouse" a test stand may be easy made from something as basic as a 2"X4" with properly fitting screws to attach the engine's four radial mounting lugs.

Try running the engine "as is" and, based on it's performance, make any needed repairs.

"If it ain't broke don't fix it" was never more appropriate in this situation.

ha ah, usually go by "if it aint broke, fix it till it is" (i joke) does the .020 use the same mounting bolts as the .049?

Nope, they're different, smaller size, but will still take a #2 wood screw.. mocrofasteners has socket head screws that are great for saving you from putting "tool marks" on the tank.

shoulda seen that one XP smaller engine, smaller screws. thanks all
SS

If used, the engine MAY have enlarged mounting lugs to accomodate more common screw sizes. Better check and see before you buy screws. DON"T ream out the holes to a larger size than you have!

IIRC, size #52 is standard for the .020.

shell shock wrote:ha ah, usually go by "if it aint broke, fix it till it is" (i joke)

U R a masochist then. U must enjoy self-abuse.


Yeah self abuse looks to both sides nervously

SuperDave wrote:

IIRC, size #52 is standard for the .020.

#52 is the standard WHAT size? Drill size for the holes in the back plate?



I have read that it may not run well with that glow head adapter. The volume of the combustion chamber is larger because of the area around threads of the glow plug not sealing until the copper ring at the top of the head.


Without the starter spring it will be a crap shoot which direction it is running when it starts. They are just as happy running backwards as forward.

Cz10 wrote:

They are just as happy running backwards as forward.

Quite charactertic of "reedy" Coxes generally. One should always check prop rational direction before launching.

Embrassing things have been know to happen. Don't ask me ghow I know.

If it runs in the wrong direction, have a towel ready that you can throw onto the prop.
that will cause it to stop immediately

Cz10 wrote:
I have read that it may not run well with that glow head adapter. The volume of the combustion chamber is larger because of the area around threads of the glow plug not sealing until the copper ring at the top of the head.

That is the most commonly assumed reason for lower performance with the adapter heads, but (swimming uphill here) I think the cause lies elsewhere.

If the plug and adapter threads were coated with a heavy oil, such as castor, before inserting the plug, any volume loss would be filled with a non-compressible liquid right to the bottom of the plug eliminating a change in compression ratio.

I believe performance loss can be tied to three factors not associated with the glowplug seal. First, the filament hole size in a standard plug has a higher volume than the COX heads. Secondly, unless the adapter is machined to allow the bottom of the plug to lie perfectly flush with the bottom of the head, cylinder displacement can be increased if the plug does not completely reach the bottom of the adapter. Certainly, the converse would hold if the plug extended into the chamber. Thirdly, COX heads have a smooth dome or trumpet shaped chamber. The adapter heads have the surface broken by the bottom of the standard plug. Flame propagation rate is impacted by both the shape and surface roughness of the head. When all factors are considered, the impact may be only 2%, but in a 14K engine, you're looking at 280 rpm.

With a PeeWee having such a tiny displacement, any volume or shape change turns into a major factor.

Just my thoughts.

andrew

And one of those extra glow heads is for a .010 engine.

I run an adapter head with specialized glo on my throttled Surestart/Lil swamp Buggy combo. The plug fits into the head exactly as it should and the engine runs/performs to my satisfaction.

The purpose of the head/glo combo is to reduce engine RPM at idle. The throttle allows me to "kill" the engine with the Tx anytime I desire.

Sweet set up!

SuperDave wrote:I run an adapter head with specialized glo on my throttled Surestart/Lil swamp Buggy combo. The plug fits into the head exactly as it should and the engine runs/performs to my satisfaction.

The purpose of the head/glo combo is to reduce engine RPM at idle. The throttle allows me to "kill" the engine with the Tx anytime I desire.

Sweet set up!

And it also means spare glow plugs are only about 3.95

Nitro:

And even free! When I first received the glo/head combo from Bernie the threads didn't match up. I explained this to Bernie and he sent me a replacement plug gratis and told me to keep the misthreaded plug.

I eventually ran a die over the threads to clean them. I now have TWO properly fitting glos for the same head.

What would we EVER do with conscienious vendors? Thanks again, Bernie.

SuperDave wrote:Nitro:

And even free! When I first received the glo/head combo from Beriie the threads didn't match up. I explained this to Bernie and he sent me a replacement plug gratis and told me to keep the mistreaded plug.

I eventually ran a die over the threads to clean them. I now have TWO properly fitting glos for the same head.

What would we EVER do with conscienious vendors? Thaks again, Bernie.

I know right these guys really keep the hobby alive.
Thanks fellas.

@nitroairplane:
That would explain the smaller size XP

@Cz10:
I have read that too. I just think its a cool add on

@GermanBeez
Would pinching the fuel line cause damage to the engine instead of throwing a towel on it? also, no damage can come from running the engine backwards is there?

Also, i have a .020 spring and a few other things en rout

shell shock wrote:@nitroairplane:
That would explain the smaller size XP

@Cz10:
I have read that too. I just think its a cool add on

@GermanBeez
Would pinching the fuel line cause damage to the engine instead of throwing a towel on it? also, no damage can come from running the engine backwards is there?

Also, i have a .020 spring and a few other things en rout

No, pinching is fine. I've found it stops the motor almost instantly. Unless you have a brass drive plate, running the engine so that it's pushing air will wear out the drive plate.

Now i know
And knowing is half the battle!

Of course there is no fuel line to pinch on the PeeWee.
Yes there is a small fuel line, you can't pinch it.

>.< is true.

If anyone is interested a have OEM .049 snap starter for CCW rotation. It was mistakenly purchased by a friend and then passed on to me.

Their most common application is in twin-engine planes where two engine running in the same direction creates torque problems.

microflitedude wrote:Of course there is no fuel line to pinch on the PeeWee.
Yes there is a small fuel line, you can't pinch it.

An easy way ive found to stop an engine is to pinch the spinner but cannot reccomend this because you could get cut of undo the prop screw.
so when doing things like this you require a bit of common sense as to when to stop,try ETC.