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MLD-28 gasoline engine

Old 05-25-2010, 08:10 PM
  #1101  
airborne2.4
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Default RE: MLD-28 gasoline engine

Ok guys, tomorrow is May 26th, 2010 and its my birthday. Where is the MLD 35cc?
Old 05-25-2010, 08:27 PM
  #1102  
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Default RE: MLD-28 gasoline engine

Happy Birthday. Apparantly they heard you. Cermark has them, I just ordered mine!!!!!

http://www.cermark.com/search.php?se...d+35&x=20&y=12
Old 05-26-2010, 07:18 AM
  #1103  
airborne2.4
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Default RE: MLD-28 gasoline engine

Thanks Jim, I'm 39 today! Wow, how did that happen? I'll check Cermark's site.
Old 05-26-2010, 07:45 AM
  #1104  
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Default RE: MLD-28 gasoline engine

Dont know, I'm 45. Seems like yesterday I was trying to find guys who were old enough to buy the beer!
Old 05-28-2010, 09:34 AM
  #1105  
stevenchao
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Default RE: MLD-28 gasoline engine

lol

Peace,
Steven Chao,
CERMARK
Old 05-29-2010, 04:45 PM
  #1106  
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Default RE: MLD-28 gasoline engine

Hey Jimeni,

I am the person who was putting together the CMP Yak 54 / MLD28 for my buddy Dale Davis and who spoke to you a couple times via e-mails about it. After diagnosing that the original ignition was DOA and advising Steven at Cermark, we got a Melody SPE-26 ignition as a replacement from them and after installing it the engine fired right up. From the looks of it, this seems to be an upgraded version as the module is much smaller than the one that came with the engine, has a much more robust plug cap and is listed as rated for 4.8v- 18v.

Karol
Old 05-29-2010, 10:11 PM
  #1107  
Jimeni
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Default RE: MLD-28 gasoline engine

Glad you got it running. I used a 7.4 v lipo on my SPE 26 ignition without a regulator the whole time I had it. not one issue there. I do use a regulator on the MLD 28 unit though.
Old 05-30-2010, 11:49 AM
  #1108  
ahicks
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Default RE: MLD-28 gasoline engine

18 volts? Wow, nice. With any luck that'll be on the front edge of a trend to allow higher voltages?
Old 05-30-2010, 04:18 PM
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Default RE: MLD-28 gasoline engine

Keep in mind that Cermark recommends 8 volts max, even though the CDI says up to 18.
Old 05-31-2010, 07:35 AM
  #1110  
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Default RE: MLD-28 gasoline engine

Remember higher voltage means higher heat which is an ignition's greatest enemy.

Karol
Old 05-31-2010, 07:55 AM
  #1111  
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Default RE: MLD-28 gasoline engine


ORIGINAL: karolh

Remember higher voltage means higher heat which is an ignition's greatest enemy.

Karol
Understood. Just thinking of all the ignition units that have been cooked running voltages just slightly over their 6v ratings? No engineer here, but with all the wizardry available today, I have to believe there's a way of building in greater tolerance than what we have today. From where I'm sitting, the 18v rating (if true) is a step in the right direction. My take, FWIW
Old 05-31-2010, 08:38 AM
  #1112  
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Default RE: MLD-28 gasoline engine

I do agree with you there, but on the other hand it seems so pointless to me in our type of R/C application to use higher than the standard 4.8 - 6.0 volts to fire the ignition and run the risk of frying the ignition when using a higher voltage, as doing so does not seemingly increase the ignition's spark.

Karol
Old 05-31-2010, 12:45 PM
  #1113  
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Default RE: MLD-28 gasoline engine


ORIGINAL: karolh

I do agree with you there, but on the other hand it seems so pointless to me in our type of R/C application to use higher than the standard 4.8 - 6.0 volts to fire the ignition and run the risk of frying the ignition when using a higher voltage, as doing so does not seemingly increase the ignition's spark.

Karol
We're agreed on that as well. I'll take the simplicity and reliability of a 4.8 pack any day - even though it's often going to mean running a second pack. The extra weight involved with that isn't something I'm ever going to notice....
Old 05-31-2010, 03:08 PM
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Jimeni
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Default RE: MLD-28 gasoline engine

You can safely use a 2 cell lipo with this ignition, no problems at all.
Old 06-01-2010, 07:09 AM
  #1115  
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Default RE: MLD-28 gasoline engine

One thing of note is that the braided HT spark plug lead is significantly shorter on the replacement Melody SPE26 ignition than on the original supplied with the engine, also the original had the HT braided lead encased in a very nice protective plastic sheath while the replacement's is supplied without this nice feature.

Karol
Old 06-01-2010, 10:57 AM
  #1116  
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Default RE: MLD-28 gasoline engine

I replaced the original ignition with an RCEXL and I like the fact that it comes with a spiral wrapping that offers a great deal of protection to the braided spark plug lead. The original, even with the thin plastic it comes with, got pretty messed up due to the constant hitting against the cowling opening caused by engine vibration.
Old 06-01-2010, 09:03 PM
  #1117  
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Default RE: MLD-28 gasoline engine

The RC exl ignition for my G20 did not come with any protective wrapping on it's HT lead, but it was a simple matter to use some automotive plastic spiral wrap to protect it as the braided lead is quite delicate.

Karol
Old 06-01-2010, 09:41 PM
  #1118  
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Default RE: MLD-28 gasoline engine

It might depend on when and where you bought the ignition unit?
Old 06-01-2010, 09:51 PM
  #1119  
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Default RE: MLD-28 gasoline engine

I guess in my case it's more likely the 'when' as it's a few years old.

Karol
Old 06-21-2010, 12:02 PM
  #1120  
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Default RE: MLD-28 gasoline engine

I have been having fits with my MLD-28. Its very inconsistent. The needle settings seem to change in flight no matter how I set them. I have vented the carb into the fuselage, changed the ignition box, changed the carb all to no avail. The engine probably has 1 gallon thru it. It runs terrible at times and when warm seems to have almost no compression.

I was intrigued about an earlier post about the carb intake being close to the cowl. My velocity stack is 3/8 away from the side of the cowl at the front and 1/2 away at the rear. The engine seems to run well on the ground but when I get airborne it really runs ratty. Its running like it's too rich. Once it gets warm it runs poorly even on the ground. When hot its hard to get started also (maybe goes along with the very low and I mean very low compression).

We temp gunned the engine and we had about 170 to 180 at the top of the cylinder and about 107 on the crankcase.

I have two other MLD-28 engines and am going to put another one in to see what happens. I can't imagine the cowl clearance would be it since once flown the problem doesn't go away until the engine is cold again.

Ideas?

Very frustrating!
Old 06-21-2010, 12:43 PM
  #1121  
ahicks
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Default RE: MLD-28 gasoline engine

>>

Am I the only one wondering why you don't adjust the motor so it runs right (or best possible) when it's warm? Maybe I've misunderstood what you're saying though.
Old 06-21-2010, 01:02 PM
  #1122  
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Default RE: MLD-28 gasoline engine

Once the problem starts no amount of adjusting helps. If you try to lean it out it will start hesitating and wont want to accelerate. I have tried adjusting the low end and then the high end to no avail. If it cools off it will seems to run better for a short time but then will start miss firing and burbling. This gets worse the longer it runs.
Old 06-21-2010, 01:31 PM
  #1123  
ahicks
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Default RE: MLD-28 gasoline engine

Have you tried adjusting the HS for max rpm first, then gone to the LS? Adjusting LS first is going to leave you chasing your tail....

The only thing I can think of to pass on would be that the cooler engine is able to burn more fuel/run richer than a warm one. What you're describing sounds like you're rich on the HS - which throws anything you've got going on with the LS out the window. HS must be set properly first, then the dinking around getting the LS right starts...
Old 06-21-2010, 01:33 PM
  #1124  
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Default RE: MLD-28 gasoline engine

Have done that. Several times. Have started over at the factory settings as as well.
Old 06-21-2010, 01:47 PM
  #1125  
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Default RE: MLD-28 gasoline engine

Have you had the carb apart?

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