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Old 06-20-2018, 09:50 AM
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DA35 Issues

The engine just came back from DA. They replaced the carb. I have not touched the needles. 1st flight of the day all is good 2-3 flips with choke on, choke off 2-3 flips and running with good idle - No sag on uplines. Here is what happens on the 2nd flight. The engine will eventually quit bogging and runs OK for that flight. The 3rd flight I gave up - kept bogging and quits as you go back to idle. Pretty much the same reason I sent the engine back to DA.

Any ideas?

DA35 Clip (0 min 40 sec)
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Old 06-20-2018, 09:56 AM
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1/8th turn out on the low end, 1/4 turn out on the high.

Scott
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Old 06-20-2018, 10:37 AM
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While needle settings can certainly be the problem, is the engine well cooled? I’m concerned the first flight was ok then other flights had problems. If not cooled well or if the carb is getting heat soaked, the symptoms can be similar to or the same as lean needle settings.
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Old 06-20-2018, 11:06 AM
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You need way more exit air. That is nowhere near sufficient for cooling.

Adding in low air pressure lips make a huge difference but you'll still need to open the belly of the aircraft to get the proper amount.

.
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Old 06-20-2018, 11:12 AM
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Bingo! We have a winner.
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Old 06-20-2018, 12:03 PM
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Thank You all

I'm on it....
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Old 06-20-2018, 12:08 PM
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Originally Posted by tchanter View Post
I'm on it....
Looks like crap but on these smaller engines, I cut the entire bottom of the cowl out. I might make a hole for the muffler, but typically it just gets connected to the big hole.

For some reason I find that in Denver, CO they need that huge exit area. Without that they tend to act funny.

Hope you get your issue solved.
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Old 06-21-2018, 11:04 AM
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Everyone talks about the 3 times as much exit as you have coming in. If you look at the first post, that plane has all that air coming in through the cowl which is doing nothing to cool the engine. To have 3 times the exit, you would have to remove a couple sections from the bottom of the fuselage.

My question is, wouldn't it be a good thing to block off the air that is coming in, but isn't cooling the engine? That way, it would be a lot easier to get the air that is cooling the engine to exit.
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Old 06-21-2018, 11:21 AM
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Originally Posted by Papatrey View Post
Everyone talks about the 3 times as much exit as you have coming in. If you look at the first post, that plane has all that air coming in through the cowl which is doing nothing to cool the engine. To have 3 times the exit, you would have to remove a couple sections from the bottom of the fuselage.

My question is, wouldn't it be a good thing to block off the air that is coming in, but isn't cooling the engine? That way, it would be a lot easier to get the air that is cooling the engine to exit.
In this case yes you could block off 2/3rd of the cheek openings on the cowling to allow your exit air hole to be a little smaller. You still want some of that upper air coming in to aid in cooling the case and carb though.
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Old 06-27-2018, 05:41 PM
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Thank You Colton

Was good and hot today - 93 with 88% humidity....

The DA35 ran flawlessly - 6 twelve min flights back to back - 5-10 min between flights.

When I quit for the day the engine was in much better than I was.

Did the lip and opened bottom of fuselage.
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Old 09-05-2019, 07:18 AM
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I had a brand new DA-35 last year that had a bunch of problems. Tuning issues, low needle had to be 2 1/2 turns out to run OK. Sent it in, they said debris in the carb screen (came that way from Walbro) , timing was off and an intermittent short in the CDI. Ran OK then not, sent it back 2nd time. They rebuilt the carb and said it was OK. Ran OK then out of tune, noticed they had blue Loctited the tuning screws. Ran OK then not again, sent it back 3rd time and I told them to keep it, exchanged it for a 70 twin.
That engine is very strong and vibrates a lot. It was shaking my new EF Slick apart. Got a new DLE 30 for it that runs fine.
At Nall they said they Loctite the screws because they back out. You're supposed to find your tuning, make a note on the turns and Loctite them in. ???
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Old 09-05-2019, 07:22 PM
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Quote:
Originally Posted by jimfergie View Post
I had a brand new DA-35 last year that had a bunch of problems. Tuning issues, low needle had to be 2 1/2 turns out to run OK. Sent it in, they said debris in the carb screen (came that way from Walbro) , timing was off and an intermittent short in the CDI. Ran OK then not, sent it back 2nd time. They rebuilt the carb and said it was OK. Ran OK then out of tune, noticed they had blue Loctited the tuning screws. Ran OK then not again, sent it back 3rd time and I told them to keep it, exchanged it for a 70 twin.
That engine is very strong and vibrates a lot. It was shaking my new EF Slick apart. Got a new DLE 30 for it that runs fine.
At Nall they said they Loctite the screws because they back out. You're supposed to find your tuning, make a note on the turns and Loctite them in. ???
Wow sounds like you had some issues. I have around 7 gallons through mine since June of last year all in the same airframe and zero issues with the motor or airframe (AJ laser). I think it runs pretty smooth for a single.
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Old 09-06-2019, 07:38 AM
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Quote:
Originally Posted by jimfergie View Post
I had a brand new DA-35 last year that had a bunch of problems. Tuning issues, low needle had to be 2 1/2 turns out to run OK. Sent it in, they said debris in the carb screen (came that way from Walbro) , timing was off and an intermittent short in the CDI. Ran OK then not, sent it back 2nd time. They rebuilt the carb and said it was OK. Ran OK then out of tune, noticed they had blue Loctited the tuning screws. Ran OK then not again, sent it back 3rd time and I told them to keep it, exchanged it for a 70 twin.
That engine is very strong and vibrates a lot. It was shaking my new EF Slick apart. Got a new DLE 30 for it that runs fine.
At Nall they said they Loctite the screws because they back out. You're supposed to find your tuning, make a note on the turns and Loctite them in. ???

So what your saying is DA provided excellent service on an engine you were having issues with, and ultimately allowed you an exchange for a 70.
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Old 09-08-2019, 01:13 PM
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yep, very good service.
very well made engines.

It appears they've had some issue's with their suppliers of CDI's and carburetors from what I've experienced and heard from others.
We have 3 DA-70's and they run well.
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