DLE-20 fried a piston...
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DLE-20 fried a piston...
DLE-20 seized up.Had good air flow in Cap 232, carb tuned properly, gas/oil mixture 32-1.Ran good several flights, then seized up mid air with no warning. Couldn't make it back to the runway damaged the airplaneplus fried the cylinder/piston/ring. Anyone had this problem? I find it interesting thatthe sources forthese parts are out of stock?The aluminum cylinder does not have a sleeveso DLE platesthe cylinder walla metalic substanceapprox .001 inch thick (so Iwas told). I have been running weed eaters, blowers, and etc for yearswith 2-sroke engines and never had one seize. Comments...
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RE: DLE-20 fried a piston...
Not much of a story without photos!
Don't remember anyone until you, having fried a DLE20 in all the many threads here.
Crank pin break, yes (a few)......seized up, no.
Don't remember anyone until you, having fried a DLE20 in all the many threads here.
Crank pin break, yes (a few)......seized up, no.
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RE: DLE-20 fried a piston...
Maybe you re-filled your gas jug, thought you added 2-stroke oil......but forgot to?<rut-row>
Even AMSOIL Saber @ 100:1 won't seize up as you claim 32:1 did, which in & of itself sounds suspicious to me.
Even AMSOIL Saber @ 100:1 won't seize up as you claim 32:1 did, which in & of itself sounds suspicious to me.
#4
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RE: DLE-20 fried a piston...
It has been straight gassed!
You may have to go to Valley View Hobbies or another source instead of Tower to get your parts?
No use going on a witch hunt.
Most of the time you can save the cylinder and will just need a new piston and ring.
On the cylinder, you use muriatic acid from the hardware store. You rub the aluminum build up with a Q-tip soaked with muriatic acid. Do not get the acid on anything but just the hard cylinder wall.
The acid will eat the aluminum but not the hard spray coating applied to the cylinder.
eventually finish up with a little 400 grit wet or dry sand paper.
Don't get the acid on any aluminum that you do not want to be eaten away.
It will boil and bubble on the aluminum
You may have to go to Valley View Hobbies or another source instead of Tower to get your parts?
No use going on a witch hunt.
Most of the time you can save the cylinder and will just need a new piston and ring.
On the cylinder, you use muriatic acid from the hardware store. You rub the aluminum build up with a Q-tip soaked with muriatic acid. Do not get the acid on anything but just the hard cylinder wall.
The acid will eat the aluminum but not the hard spray coating applied to the cylinder.
eventually finish up with a little 400 grit wet or dry sand paper.
Don't get the acid on any aluminum that you do not want to be eaten away.
It will boil and bubble on the aluminum
#5
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RE: DLE-20 fried a piston...
Here is a picture with a small square mirror laying inside a 42cc Mahle cylinder from a Husqvarna chain saw showing the aluminum that has been transfered to the cylinder above and below the exhaust port from the piston in a straight gas mishap.
If this aluminum can be removed with muriatic acid without getting any acid on any other part of the cylinder, then the cylinder can be saved.
After removing the transferred aluminum you need to make sure that there are no streaks where the hard Nikasil coating was actually removed show bare aluminum.
It would be better to use a Bowman ring on your new piston.
If this aluminum can be removed with muriatic acid without getting any acid on any other part of the cylinder, then the cylinder can be saved.
After removing the transferred aluminum you need to make sure that there are no streaks where the hard Nikasil coating was actually removed show bare aluminum.
It would be better to use a Bowman ring on your new piston.
#6
RE: DLE-20 fried a piston...
ORIGINAL: cphdrider
DLE-20 seized up.Had good air flow in Cap 232, carb tuned properly, gas/oil mixture 32-1.Ran good several flights, then seized up mid air with no warning. Couldn't make it back to the runway damaged the airplaneplus fried the cylinder/piston/ring. Anyone had this problem? I find it interesting thatthe sources forthese parts are out of stock?The aluminum cylinder does not have a sleeveso DLE platesthe cylinder walla metalic substanceapprox .001 inch thick (so Iwas told). I have been running weed eaters, blowers, and etc for yearswith 2-sroke engines and never had one seize. Comments...
DLE-20 seized up.Had good air flow in Cap 232, carb tuned properly, gas/oil mixture 32-1.Ran good several flights, then seized up mid air with no warning. Couldn't make it back to the runway damaged the airplaneplus fried the cylinder/piston/ring. Anyone had this problem? I find it interesting thatthe sources forthese parts are out of stock?The aluminum cylinder does not have a sleeveso DLE platesthe cylinder walla metalic substanceapprox .001 inch thick (so Iwas told). I have been running weed eaters, blowers, and etc for yearswith 2-sroke engines and never had one seize. Comments...
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RE: DLE-20 fried a piston...
Thanks for all the responses... With regard to the missing oil, NOI did not forget the oil and I checked that as soon as I got home. I use Pennzoil 2-cycle air-cooled engine oil 32-1 ratio. I have five DLE engines and I use the same gas/oil mixture for all. I should point out that I am a mechanical engineer and I have rebuilt car engines and numerous small2 and 4 stroke enginesover the years.It is very possible that the metalic plating was improperly applied thus the premature failure.With regard to buying the parts from other than Tower,Icontactedseveral hobby dealersthat carry the DLE 20 andnoone had the parts.I would name the dealers but that would not be appropriate as they all stated the parts Ineeded was on order from China. Normally, eBay has these parts also but not this time which leads me to believe there has been a high demand?
No need for additional comments other thanif anyonehas experienced the same problem with the DLE 20?
No need for additional comments other thanif anyonehas experienced the same problem with the DLE 20?
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RE: DLE-20 fried a piston...
Take it apart and examine the piston and ring. That should tell you why it seized. Manufacturer error or operator error? Who knows without examining anything.
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RE: DLE-20 fried a piston...
ORIGINAL: cphdrider
No need for additional comments other than if anyone has experienced the same problem with the DLE 20?
No need for additional comments other than if anyone has experienced the same problem with the DLE 20?
You could do a 'Search' to see if there's any other such reported incidences, also try googling it.
Photo's would still be good to post!
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RE: DLE-20 fried a piston...
ORIGINAL: ahicks
It's not hard at all to verify that oil has been mixed with the gas. All you have to do is look at the color of the can's contents? Any oil I've ever used will make the mix turn much darker than raw gasoline might be.
It's not hard at all to verify that oil has been mixed with the gas. All you have to do is look at the color of the can's contents? Any oil I've ever used will make the mix turn much darker than raw gasoline might be.
Sometimes someone (owner, relative, neighbor) uses the gas, refills,
forgets to add the 2-stroke oil -or- don't tell the owner, and presto...meltdown
{I'd be just a wee bit ticked off if that happened to me}
Since no one else has reported the same thing (I googled), it keeps
coming back to no oil. I'd bet TBM/TH/VVRC doing warranty on it would agree.
But beyond that, it IS odd no one has parts in the USA for it.
Must have been a HUGE Christmas rush on DLE20's!
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RE: DLE-20 fried a piston...
Once again... I did not run the engine without oil. When I got home from the flying field, I poured the gas out of the container into a clear glass jug. I then re-mixed another gallon and compared the color andit was exactly the same. I flew another plane with a DLE 20 thenext dayusing the same gas/oil mixture that I was running when the engine seized and had no problems.I think it isa direct result of cylinder plating and I find it ironic that only a month ago parts were available.
#15
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RE: DLE-20 fried a piston...
I haven't experienced the seizure problem on my little DLE but do have something to add. This issue is sometimes caused by excess temperature. Without some way of knowing what the engine temp was running at the time of failure ie - telemetry, data recorder, or venom on board temp recorder etc excess temp could very well explain the seizure.
When I put together my first DLE30 powered plane I setup everything identical to my 50cc bird. Cooling exit percentages etc were the same. I had set the telemetry warning on my DX8 for 320 degs. F and shortly after takeoff the warning came on. I throttled back and landed to see what triggered the alarm and was surprised to see it was engine temp. I rearranged my baffles and opened up the exit some more adding a small dam just forward of the opening to increase the air depression at the exit. The temps came down to a reasonable level but it still took quite a while before it broke in enough to run consistently in the middle 200 deg range. In a very long hover it will still climb to 290 to 300 degs and much higher than that, IMHO, is too high. Just more food for thought as these little guys don't just melt pistons down for no reason. It takes a sharp eye and a willingness to see the problem to resolve these kinds of issues. The same cooling efforts that work on a 50cc may not be enough for these little fellows and the only way to know is some form of telemetry or onboard temp recorder such as the sub 20 dollar Venom.
Link to the Venom at Tower http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHUH3
Jim L, the scenario you described about the anonymous refilling of the fuel jug has gotten me in trouble before. My wife knows which jugs contain "Two Stroke" fuel and therefore if the yard equipment can runs out she will sometimes swipe some of mine. Trying to be helpful she refilled the can once and forgot to tell me. Since that time I have bought special fuel dye (Deep Blue) and use it religiously so I can tell if the "Model Gas Fuel" can has been refilled. The red oil turns the mixture purple and if it has been refilled it will look mostly straw colored letting me know I need to remix. I have a couple of expensive weed whackers here (Echo) that met the same fate. Now we don't ruin two strokers that way any more. I also keep a small quart can of the ethanol free premixed stuff like they sell in Home Improvement stores so if she runs out she can resort to that.
When I put together my first DLE30 powered plane I setup everything identical to my 50cc bird. Cooling exit percentages etc were the same. I had set the telemetry warning on my DX8 for 320 degs. F and shortly after takeoff the warning came on. I throttled back and landed to see what triggered the alarm and was surprised to see it was engine temp. I rearranged my baffles and opened up the exit some more adding a small dam just forward of the opening to increase the air depression at the exit. The temps came down to a reasonable level but it still took quite a while before it broke in enough to run consistently in the middle 200 deg range. In a very long hover it will still climb to 290 to 300 degs and much higher than that, IMHO, is too high. Just more food for thought as these little guys don't just melt pistons down for no reason. It takes a sharp eye and a willingness to see the problem to resolve these kinds of issues. The same cooling efforts that work on a 50cc may not be enough for these little fellows and the only way to know is some form of telemetry or onboard temp recorder such as the sub 20 dollar Venom.
Link to the Venom at Tower http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHUH3
Jim L, the scenario you described about the anonymous refilling of the fuel jug has gotten me in trouble before. My wife knows which jugs contain "Two Stroke" fuel and therefore if the yard equipment can runs out she will sometimes swipe some of mine. Trying to be helpful she refilled the can once and forgot to tell me. Since that time I have bought special fuel dye (Deep Blue) and use it religiously so I can tell if the "Model Gas Fuel" can has been refilled. The red oil turns the mixture purple and if it has been refilled it will look mostly straw colored letting me know I need to remix. I have a couple of expensive weed whackers here (Echo) that met the same fate. Now we don't ruin two strokers that way any more. I also keep a small quart can of the ethanol free premixed stuff like they sell in Home Improvement stores so if she runs out she can resort to that.
#16
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RE: DLE-20 fried a piston...
Dle Australia has them http://www.dlenginesaustralia.com/dl...&productId=473
#20
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RE: DLE-20 fried a piston...
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RE: DLE-20 fried a piston...
ORIGINAL: Jezmo
.......................................
Jim L, the scenario you described about the anonymous refilling of the fuel jug has gotten me in trouble before. My wife knows which jugs contain ''Two Stroke'' fuel and therefore if the yard equipment can runs out she will sometimes swipe some of mine. Trying to be helpful she refilled the can once and forgot to tell me........................
.......................................
Jim L, the scenario you described about the anonymous refilling of the fuel jug has gotten me in trouble before. My wife knows which jugs contain ''Two Stroke'' fuel and therefore if the yard equipment can runs out she will sometimes swipe some of mine. Trying to be helpful she refilled the can once and forgot to tell me........................
H-o-w-e-v-e-r, the wife did goof up once big time![]
She bought us a new 22" push mower, and I helped unload it after she got home, setting the quart of eng oil to the side.
She unfolds the handle, and locks it into place, then fills up the gas, sets the throttle and grabs the pull cord ready to start it up.
I said hold on, don't ya think it'd be a good idea to fill up the crankcase with that oil they included? Wife checks he mini dipstick
and seeing it 'wet' claims it already has oil in it. I said you bought it, but remember this day, it'll come back to bite ya later!
(She was in one of those I'll do it my way moods).
Oldest daughter was mowing back then and got 4 uses out of it before the mower seized up SOLID![:@]
I just grabbed that quart of oil and walked by the wife whistling and swinging the oil.
Took it to work, punched the crank out, reamed & bushed the top bearing area, and viola.....back up & running.
Wife now says ZERO about mechanical issues such as engines & oil.
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RE: DLE-20 fried a piston...
ORIGINAL: cphdrider
DLE-20 seized up. Had good air flow in Cap 232, carb tuned properly, gas/oil mixture 32-1. Ran good several flights, then seized up mid air with no warning. Couldn't make it back to the runway damaged the airplane plus fried the cylinder/piston/ring. Anyone had this problem? I find it interesting that the sources for these parts are out of stock? The aluminum cylinder does not have a sleeve so DLE plates the cylinder wall a metalic substance approx .001 inch thick (so I was told). I have been running weed eaters, blowers, and etc for years with 2-sroke engines and never had one seize. Comments...
DLE-20 seized up. Had good air flow in Cap 232, carb tuned properly, gas/oil mixture 32-1. Ran good several flights, then seized up mid air with no warning. Couldn't make it back to the runway damaged the airplane plus fried the cylinder/piston/ring. Anyone had this problem? I find it interesting that the sources for these parts are out of stock? The aluminum cylinder does not have a sleeve so DLE plates the cylinder wall a metalic substance approx .001 inch thick (so I was told). I have been running weed eaters, blowers, and etc for years with 2-sroke engines and never had one seize. Comments...
You mention good airflow in the Cap
Is the engine inverted in the cowl?
Is the air coming into the cowl through the standard 2 inlets on each side of the prop?
Please show pics of the install, including the baffling directing the air to the cylinder.
2 things cause piston seizure.
Insufficient lubrication (This can include high friction caused by coating breakdown)
Excess temperature.
Without pics of the damaged items, nobody here can assist you. Wihout pics of the install, there is also little help available here for you.
#23
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RE: DLE-20 fried a piston...
Just to stir the sensitivity pot.
There is only one reason to stick a piston and that ownership lies with the person running the engine. Period. Everyone else dancing around your sensivitity with political correctness is doing you a disservice by providing a means for you to avoid responsibility.
Yea, cooking off an engine and then making numerous attempts to avoid responsibility really was enough to get me to post again. Don't get your hopes up and think there will be much of that happening.
There is only one reason to stick a piston and that ownership lies with the person running the engine. Period. Everyone else dancing around your sensivitity with political correctness is doing you a disservice by providing a means for you to avoid responsibility.
Yea, cooking off an engine and then making numerous attempts to avoid responsibility really was enough to get me to post again. Don't get your hopes up and think there will be much of that happening.
#25
RE: DLE-20 fried a piston...
ORIGINAL: av8tor1977
Aw come on Tom. Just hasn't been the same around here without ya!
Miss ya big guy,
AV8TOR
Aw come on Tom. Just hasn't been the same around here without ya!
Miss ya big guy,
AV8TOR
He better spell better though Capt,n over & out!