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MLD-28 gasoline engine

Old 03-05-2009, 05:10 AM
  #101  
hutchi
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Default RE: MLD-28 gasoline engine

I'm not sure if there is a deference with yaks, extras, edges but I read somewhere that you should have 1 to 1-1/2 inches between prop an cow, for prop to be most effective
Old 03-05-2009, 07:36 AM
  #102  
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Default RE: MLD-28 gasoline engine

just follow the directions for proper engine placement for the relationship between the cowl and the spinner. my aw yak is nowhere near that. that would be quite ugly imo to be that far out, even harder to cg.
Old 03-08-2009, 01:34 PM
  #103  
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Default RE: MLD-28 gasoline engine

On 03-07-2009 I started My MDL 28cc for the first time. It started right off, very little vibration and great power for a engine that was just started for the first time. The tem was 70. Never touched the needles. Burned 10 oz in 8 minutes.
Very impressed!
john
Old 03-08-2009, 01:46 PM
  #104  
Jimeni
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Default RE: MLD-28 gasoline engine

I hear that. I had an SPE 26, and was still impressed at how much power the MLD 28 has, big difference over the SPE. I'm going to try and start getting numbers with different props and mufflers today. Not sure on the carb. The SPE said "hey, you need to try a different carb because mine sux", was a huge improvement. The transition on the MLD carb seems great, and RPM change is linear to stick movement, full scale. It does not appear to need a carb upgrade at this point, but I still might do it just to see what we can get out of her.
Old 03-08-2009, 02:38 PM
  #105  
stevenchao
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Default RE: MLD-28 gasoline engine

Jimeni,

There is a difference in rpm performance between the standard side muffler and the the rear (pitts style) muffler. The side muffler is approximately 200 rpm better on the top end with APC. There are other rear mufflers that are not from SPE that can be used. However, we have not tried them. One of which is Jtec, one of the modeler claims that it has a larger expansion chamber (minimize back-breasure), which we have not verified.


Peace,
Steven Chao,
CERMARK
Old 03-08-2009, 03:12 PM
  #106  
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Default RE: MLD-28 gasoline engine

Just started mine yesterday also and it runs great!! Just wondering what the head temps should be at?
Old 03-08-2009, 03:14 PM
  #107  
Jimeni
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Default RE: MLD-28 gasoline engine

I have not tried the Jtec either. Just the one for the SPE 26, from SPE. I plan to test a Vess 18x6, and 17x6, a Zinger 18x6, and an APC 17x6, with stock muffler, and then pitts. If I see an RPM loss, I will start playing with exhaust opening sizes. I may get the Jtec and try it as well. From just a visual, I dont see the SPE pitts as having smaller expansion chamber area, I would guess the pitts has more if anything. The stack inner diameter of the 2 stacks combined is .95" (.475" each), the inner diameter of the single stack on the stock muffler is .65". Maybe the pitts does not have enough back pressure. Did you try reducing the opening of the stacks on the pitts? The reduced back pressure may increase ignition efficency (by reducing compression/resistance on the plug), but I'm pretty sure you will lose power.
Old 03-08-2009, 03:40 PM
  #108  
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Default RE: MLD-28 gasoline engine

another thing to possibly look at with the difference in the two exhaust is the way the exhaust travels. being a 2 stroke exhaust is criticle for making power. thats why you install expansion chambers to draw out the exhaust from the combusion chamber. the stock muffler the expansion chamber is right on the head no turns to come out and then dumps right out. the pitts you have a 90degree turn which could create turbulance and if the expansion chamber is not big enough the draw just isn't there. and in some cases a single outlet can create more flow than 2, even if the two has a greater area. for an example a single 3" exhaust will out flow a dual 2 1/2" at least with a car.
Old 03-08-2009, 04:52 PM
  #109  
Jimeni
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Default RE: MLD-28 gasoline engine

Ok, after 20 oz of fuel, factory needle settings, stock muffler, I got 8100 RPM with a Vess 18x6. Very nice, this will go way up I am going to have to look at timing, it seems to be detonating just a very tiny bit. That could bring more rpms immediately. I have a 10 oz tank, ran 2 tanks through that were not even quite full. So 8100 rpm at a little less than 20 oz actually. My neighbors now hate me Got rained out, the other props will have to be ran later.
Old 03-08-2009, 05:19 PM
  #110  
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Default RE: MLD-28 gasoline engine

looks like that this motor might just prove to be a real power house. can't wait to go to synthetic
Old 03-08-2009, 08:23 PM
  #111  
Jimeni
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Default RE: MLD-28 gasoline engine

The latest version of the manual says to use AMSoil Sabre at 100:1 right off the bat. No special break in ratio. You can switch now.
Old 03-08-2009, 09:03 PM
  #112  
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Default RE: MLD-28 gasoline engine


ORIGINAL: Jimeni

The latest version of the manual says to use AMSoil Sabre at 100:1 right off the bat. No special break in ratio. You can switch now.
great does that mean i wasted $4.87 on sthil oil. ohwell i guess i can use it on may chainsaw. i have some yard clean up anyways.
Old 03-08-2009, 11:01 PM
  #113  
leepord geko
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Default RE: MLD-28 gasoline engine

Wheres this latest manual? And no matter what engine you run doing 100:1 for break in is going to smoke it! And if not is sure won't last more than one year. Yes Amsoil saber is probably one of the top out there but you don't need to run it 100:1, im running mine at 32:1 with amsoil saber and it hovers under half throttle right away, just saying why ruin an engine if it already has more than enough power! fly it for a season with 32:1 of whatever oil you choose.
Old 03-09-2009, 06:33 AM
  #114  
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Default RE: MLD-28 gasoline engine

32:1 is way to rich in my opinion anyways theres so much oil i don't know how the motor will get hot enough and allow the ring to seat. my jetski's for instance have an oil injection system and you have to run synthentic oil because it runs a lean oil ratio and it never changes from the initial break in to 500 hrs. plus to much oil will cause deposits in the exhaust ports that you will have to clean every now and then. i would also like to see were they say to break in on sabre 100:1 but that has been my thoughts the entire time i just follow instructions just to make sure i keep my warranty.
Old 03-09-2009, 09:57 AM
  #115  
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Default RE: MLD-28 gasoline engine

I've been told by a lot of people you can go straight to 100:1 it will just take a little longer to break in.

Royal Purple is what we use
Old 03-09-2009, 11:01 AM
  #116  
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Default RE: MLD-28 gasoline engine

another thing is that oils have changed alot over the past years. even cars used to be change oil every 3000mls now some are at 10000mls the oils are just getting better and engine quality is getting better too.the makers of 2st oil if they say 100:1 then it has been tested and proven or else there would be alot of law suites against them.
Old 03-09-2009, 11:20 AM
  #117  
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Default RE: MLD-28 gasoline engine

To clarify, when I say "a lot of people" I mean some of the big boys in the IMAC and 3D giant scale scene.
Old 03-09-2009, 12:17 PM
  #118  
jship
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Default RE: MLD-28 gasoline engine

I still havent seen in writing yet. I will stay with My normal breakin mix, at this point.
john
Old 03-09-2009, 05:09 PM
  #119  
Jimeni
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Default RE: MLD-28 gasoline engine

I thought the same thing about the break in oil. Cermark has broke in 4 (I think is the number) MLD's with this ratio, and they are doing great. Sabre guarantees proper lubrication at 100:1. I thought synthetic break in would take longer, but Cermark says no, it does not. I'm actually running at 80:1 right now with Sabre, had a half gallon of that ratio left.

I have seen it in writing, if you want, PM me your email, and I will send you a PDF copy. Or Steven at Cermark would be glad to send it as well.
Old 03-09-2009, 05:38 PM
  #120  
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Default RE: MLD-28 gasoline engine

Jimeni,

This AMSoil Sabre you speak off from the manual, is this just what Cermark has tested on 4 of there engines and they recommend it or do they say other oil can be used. I'm just curious as I've always used Pennzoil, Lawboy Ashless, Lucus Oil, or whatever is available in the store and never had any problems with these small gassers. Lately I've been running Lawboy Ashless oil at 32:1 in my G26. Not trying to start anything just curious about the oil and the MLD 28cc engine.


Old 03-09-2009, 06:48 PM
  #121  
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Default RE: MLD-28 gasoline engine

Would you consider letting one or two of us beta test them?? I would be more than willing to place my plane at Peril to help you out. I'm only dreaming, but what kind of price tag are we talking? seriously i would beta test it.
Old 03-09-2009, 06:59 PM
  #122  
Jimeni
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Default RE: MLD-28 gasoline engine

Other oils can be used, and ratio's are provided for them.
Old 03-09-2009, 07:00 PM
  #123  
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Default RE: MLD-28 gasoline engine

Old 03-09-2009, 07:12 PM
  #124  
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Default RE: MLD-28 gasoline engine

I have not received my MLD 28 yet but I'm trying to get supplies ordered for it. What size fuel tubing should be used with the MLD 28? Also what fuel pump works for gasoline?
Thanks,
Ralph White, Neoga, IL
Old 03-09-2009, 07:19 PM
  #125  
Jimeni
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Default RE: MLD-28 gasoline engine

1/8" tygon tubing. Any pump that specifies gasoline. I have this fueling system, its awesome. http://www3.towerhobbies.com/cgi-bin...?&I=LXRRD0&P=0

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