RAPPTOR

My Feedback: (41)

Dle 30 cc will not "4 CYCLE ON THE GROUND " !
Runs nice on top end ,but if try to, run rich, it will not burble. Cuts off at 1/4 throttle
idle perfect
i just want to fly around half power and have it run rich
18/8 prop. New engine 6 volt ignition
no cowle or with cowle no change

daveopam

My Feedback: (9)

My question would be why? I don't see a benefit from it. If you want to run it a little rich for a few tanks the spark plug fouling would be the biggest down side. On the other hand you could have a dead stick at the wrong time and cost you the airframe.

To answer best I can it is much harder to get a spark ignited engine to "4 stroke" compared to a compression ignition engine.

David

ahicks

My Feedback: (2)

That "burble" at half throttle is generally blamed on a rich low end. Another big factor is light engine loading - like at a low cruise throttle setting. Most will get plenty of that with an engine that's been adjusted normally. I sure wouldn't be going too far out of my way with my tune looking for it! Set the engine up normally and the burble/4 stroking will find you......

w8ye

My Feedback: (16)

They'll part throttle four stroke in flight easier than they will on the ground

RAPPTOR

My Feedback: (41)

It goes ,,crazy rich in the air.. Can not do any ,loops ,rolls ,hard banks ..
Goes rich ,,stalls
engine is 10 days old.
Put new carb kit in it
18/8 prop
true gas, no menthenal
ngk cm56 plug
redid fuel system 2 times /
diapham vent out side cowle

at 1/4 throttle .from going up or down ,, sputters and shuts off. If i stay at that setting

ahicks

My Feedback: (2)

If it were actually going rich, it would be really unusual for one of these to go so rich it would stall in flight. With 2 different carbs doing the same thing, either you're doing something wrong, or it's not the carb. Are you working with somebody with gas experience in your group/club?

dirtybird

My Feedback: (5)

Erratic running means to me you have an air leak or there is something wrong with the reed system

Gizmo-RCU

My Feedback: (27)

Only10 days old and all those problems? Suggest you may be causing your own problems, sounds like you are very rich? What type and how much oil are you using? 32 to 1, syn. is suggested for my 35 ra and it runs flawlessly.
Obtain some help from someone familiar with similar engines.

RAPPTOR

My Feedback: (41)

one carb

RAPPTOR

My Feedback: (41)

reeds hand lapped. Pulls fuel. Hand start.

RAPPTOR

My Feedback: (41)

11 gas guys looked at it on ground and in flight .. No answers

RAPPTOR

My Feedback: (41)

ment 4 cycle

raptureboy

Going rich does seem very unusual, start over with very basic needle settings. Just get it to run. I have found on my DLE's that as little as a 1/16 of a turn can mean the difference between rich and lean. Low and Hi needles go hand in hand, one effects the other. Check the metering needle to be sure it is functioning correctly. I had one with a tiny piece of metal shaving sitting under it from the factory that kept it open a little and caused it to flood.

CARS II

My Feedback: (7)

It goes ,,crazy rich in the air.. Can not do any ,loops ,rolls ,hard banks ..
Goes rich ,,stalls
engine is 10 days old.
Put new carb kit in it
18/8 prop
true gas, no menthenal
ngk cm56 plug
redid fuel system 2 times /
diapham vent out side cowle



diapham vent out side cowle

Will this be this be the problem?

RAPPTOR

My Feedback: (41)

facing rearward .static pressure

Gizmo-RCU

My Feedback: (27)

Recently one of my flying buddies mounted a DLE 20 too cowl to the firewall by about 2/8th of an inch. Ran well withe the cowl off and surged with it on........he tried a lot of fixes until the problem was solved!

Gizmo-RCU

My Feedback: (27)

Close is what I intended to say.

CARS II

My Feedback: (7)

I learned that if you vent it should be done inside the fuse, I haven't had the need to do so but if I do it will go into the fuse, the other thing I learned is that if the exit opening of the cowl is too small then one may have those problems

It has to do with air pressure.

ahicks

My Feedback: (2)

OP mentions in his first post "no cowle or with cowle no change".

Maybe it's just me, but with "11 gas guys looked at it on ground and in flight .. No answers" I'm becoming a bit skeptical. Wondering if there isn't more to this that we need to know, or haven't heard about yet.

Gizmo-RCU

My Feedback: (27)

Could be still too close, but I doubt that is the problem now that you reminded me of the OP.

RAPPTOR

My Feedback: (41)

one inche hole in fire wall for carb

RAPPTOR

My Feedback: (41)

most likely "new bad engine or carb or ignition. Im not interested in doing-- dle-- ," quality control."



9 dead sticks is enough for me .. Ask tower for refund and get "da"

kmeyers

What makes you think it is rich in the air?

I have seen people have multiple dead sticks swear they were tuned perfectly and 1/8 to 1/4 turn richer problem solved. Not saying that is your problem, but, anyone who tries to run rich so it sounds like a four cycle condition is asking for trouble. Guess what, you found it.

What are your needle settings?

Have any of those 11 experts tried tuning it from scratch.

I would get the best tuner to set it to what he thinks perfect is and try flying it that way.

IMHO a couple of cents worth.

Gizmo-RCU

My Feedback: (27)

A problem I recently had was loose head bolts causing air leakage and failure to retain a tune and constant need to re-tune. Snugged it down and all is well (not a DLE but similar).