RE: DL-50 engine  
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RE: DL-50 engine - 10/29/2007 12:33:03 PM   
bubbagates



Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline 		I'd agree, the breakin procedure is being over complicated. The most common questions I get in PM and other threads regarding breakin of a gas engine is tuning and breakin.

My point is, install the thing, tune and prop it correctly, run the correct oil mixtures and go fly it, the difference in load during flight as well as the airflow will be the best thing you can do for the engine and how long it lasts.

So I ask this, has anyone taken temp readings throughout the 45 to 60 minutes of ground running? If so what were they? I'll bet they were pretty high near the end of the run and if not the engine was so rich the plug was probably close to being fouled (nice and black in color)

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Normal is not something to aspire to, it's something to get away from

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       Post #: 126

RE: DL-50 engine - 10/29/2007 3:38:00 PM   
arobatx


 

Posts: 1589
Joined: 1/18/2006
From: Kalona, IA, USA
Status: online 		If you are relatively new to gassers, I would recommend mounting the engine on a test stand to familiarize yourself with the fuel system and needles. It will offer a safer, more straightforward setup to get used to how things work. Also, this provides an initial troubleshooting step already taken before mounting your setup into the plane. If, when you mount things into the plane you notice problems, it is easy to deduce what may be different as compared to your test stand setup. Again, I would only recommend this for those newer to gas engines...and even then, would only leave the engine mounted in this way long enough to familiarize yourself with how things work, and get the needles set appropriately. Beyond that, I see more of a chance for harming the engine on a test stand than I see helping it....especially in respect to the dissipation of of vibration, and cooling. If you are already familiar with gas engines for our hobby, run a good break-in oil, tune the carb correctly and fly it. The std 10-15 min flights with cool down in-between, varying the throttle and load, will offer very good heat cycling during the ring seating process.

Chad

(in reply to bubbagates)
       Post #: 127

RE: DL-50 engine - 10/29/2007 4:03:40 PM   
bubbagates



Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline
quote:

ORIGINAL: arobatx

If you are relatively new to gassers, I would recommend mounting the engine on a test stand to familiarize yourself with the fuel system and needles. It will offer a safer, more straightforward setup to get used to how things work. Also, this provides an initial troubleshooting step already taken before mounting your setup into the plane. If, when you mount things into the plane you notice problems, it is easy to deduce what may be different as compared to your test stand setup. Again, I would only recommend this for those newer to gas engines...and even then, would only leave the engine mounted in this way long enough to familiarize yourself with how things work, and get the needles set appropriately. Beyond that, I see more of a chance for harming the engine on a test stand than I see helping it....especially in respect to the dissipation of of vibration, and cooling. If you are already familiar with gas engines for our hobby, run a good break-in oil, tune the carb correctly and fly it. The std 10-15 min flights with cool down in-between, varying the throttle and load, will offer very good heat cycling during the ring seating process.

Chad



What he said

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to arobatx)
       Post #: 128

RE: DL-50 engine - 10/30/2007 12:50:13 AM   
paul5992


 

Posts: 348
Joined: 9/28/2006
From: Red Wing, MN, USA
Status: offline 		You guys may be right but I was new to gassers. So I followed the instructions for the first 2 hours at 2500rpm. I don't know why that is in the instructions if your just suppose to go fly it. Then I called Bob at dlusa to find out what he thought. He said not to run it at the 4000rpm but the 2500rpm thing was fine but not needed. That was after I had already ground run it for the 2 hours. My motor runs strong maybe not as strong as some but I'm happy with 6950 on a xoar 22x8 after about 1 gallon at 30 to 1 lawn boy. Bob told me that when You go synthetic you should see about 300rpms more. I can't wait to see that.


What kind of differance did you guys see When you went synthetic? Alot or a little?

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       Post #: 129

RE: DL-50 engine - 10/30/2007 12:57:29 AM   
jrjohn


 

Posts: 2279
Joined: 1/9/2002
From: stevens point, WI, USA
Status: online
quote:

ORIGINAL: paul5992

You guys may be right but I was new to gassers. So I followed the instructions for the first 2 hours at 2500rpm. I don't know why that is in the instructions if your just suppose to go fly it. Then I called Bob at dlusa to find out what he thought. He said not to run it at the 4000rpm but the 2500rpm thing was fine but not needed. That was after I had already ground run it for the 2 hours. My motor runs strong maybe not as strong as some but I'm happy with 6950 on a xoar 22x8 after about 1 gallon at 30 to 1 lawn boy. Bob told me that when You go synthetic you should see about 300rpms more. I can't wait to see that.


My buddie has a Berrelli 366 60cc, he's really thrilled this the performance, it's turning 6700 with a 23x8 NX Prop. My DL-50 turns 6800 with the same prop.

John

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       Post #: 130

RE: DL-50 engine - 10/30/2007 1:09:17 AM   
nonstoprc



Posts: 1044
Joined: 9/9/2003
From: austin, TX, USA
Status: offline
quote:

ORIGINAL: paul5992

Then I called Bob at dlusa to find out what he thought. He said not to run it at the 4000rpm but the 2500rpm thing was fine but not needed.


Do not know why DLUSA still states the 2 hour @2500RPM run as part of break-in in their website. 2500rpm run can not be simulated in the air!

(in reply to paul5992)
       Post #: 131

RE: DL-50 engine - 10/30/2007 1:11:47 AM   
jrjohn


 

Posts: 2279
Joined: 1/9/2002
From: stevens point, WI, USA
Status: online 		Ever see or hear of somebody breaking in a chain saw, or even giving it special attention? Basically the same thing we are running in our planes

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       Post #: 132

RE: DL-50 engine - 10/30/2007 1:12:48 AM   
paul5992


 

Posts: 348
Joined: 9/28/2006
From: Red Wing, MN, USA
Status: offline 		The new instructions say to run it an hour I think.

(in reply to nonstoprc)
       Post #: 133

RE: DL-50 engine - 10/30/2007 1:17:31 AM   
paul5992


 

Posts: 348
Joined: 9/28/2006
From: Red Wing, MN, USA
Status: offline 		Jrjohn, When I bought my new snowmobile they dumped some oil in the tank to richen it up and told me to ride it like I was going to ride it everyday. Just don't drag race it all day. I think that the guys that say not to make this break in thing such a big deal are right run it a little and go fly it.

(in reply to jrjohn)
       Post #: 134

RE: DL-50 engine - 10/30/2007 1:20:57 AM   
jrjohn


 

Posts: 2279
Joined: 1/9/2002
From: stevens point, WI, USA
Status: online
quote:

ORIGINAL: paul5992

Jrjohn, When I bought my new snowmobile they dumped some oil in the tank to richen it up and told me to ride it like I was going to ride it everyday. Just don't drag race it all day. I think that the guys that say not to make this break in thing such a big deal are right run it a little and go fly it.



Agreed, I like to run it a little on the ground in the plane for one reason, to get it tuned properly so I don't have a dead stick. As far as breaking it in. I fly it the way I normally do from the first flight foreword. (just a different oil, and more of it)

John

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       Post #: 135

RE: DL-50 engine - 10/30/2007 1:52:16 AM   
bubbagates



Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline
quote:

2500rpm run can not be simulated in the air!


No need too. Just fuel it, tune it and go fly it. Let it cool a bit between flights and go fly it again. Heat cycles are good during the breakin. You'll know when it's ready, just check your rpms every so often and most likely you will need to retune once or twice. Most engines gain a few hundred rpm, even without switching oil (from petrolium to synthetic)

I used to use strictly Pennzoil Aircooled oil with is petrolium based from day once, I jsut chaged the mix so it was easy to see it was the engine breaking in and not the oil. I then started using 100:1 Amzoil and the first DA50 I had needed a rebuild after 30 gallon as it was carboned up pretty good. Now I use Belray at 50:1 and my other DA50 has switched to this once I saw an rpm increase which was roughly 6 gallons on Pennzoil at 32:1. At first I was turing a 23x8 Mezjlik at 6850 and now I turn it at close to 7200 and the engine is completely spotless that last I looked inside it

I'm breaking in my DL50 the exact same way using the exact same oils and will be switching out to Belray shortly as I have already gained 200rpm with the 22x8 amd will get another 200 or so after switching to Belray so I'll need a bigger prop to kep the engine in it's torque range

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

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       Post #: 136

RE: DL-50 engine - 10/30/2007 2:28:28 AM   
edward cobb


 

Posts: 80
Joined: 2/9/2006
From: wedowee, AL, USA
Status: offline 		Welcome back jrjohn, thought we lost you. have you seen aerobob.

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       Post #: 137

RE: DL-50 engine - 10/30/2007 2:31:01 AM   
nonstoprc



Posts: 1044
Joined: 9/9/2003
From: austin, TX, USA
Status: offline 		I am using Pennzoil Aircooled at 40:1 after break in on DA50. Good high RPM (7200 with Menz 22X8) and no overheat. I do no like Amsoil at 100:1 either. Bad to DA50!

Back to the break-in subject. From common sense, the slow 1-2 hour 2500rpm run would provide a better base for in-air break-in. The problem is that its advantage is not quantifiable. And thus people tends to skip it.


(in reply to bubbagates)
       Post #: 138

RE: DL-50 engine - 10/30/2007 2:36:37 AM   
jrjohn


 

Posts: 2279
Joined: 1/9/2002
From: stevens point, WI, USA
Status: online