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Official 3DRCF Review of the EME 70cc Twin

Discussion in 'Official GSN Product Reviews' started by Bipenut53, Feb 29, 2016.

   
  1. Bipenut53

    Bipenut53 150cc

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    Location:
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    Hello all,
    Well this review has been a while in coming. It is for the EME 70cc Twin cylinder engine.




    010.JPG


    I bought this engine from Mile High RC All I can say is these guys are great people and support their products very well. I bought it from them about 10 months ago for my 91" Extreme Flight Extra 300 EXP. I was looking for an engine for this airplane because I knew it would take a bit more power than your typical 50cc engine. First off here is a little bit about the engine from the website:


    Some cool things about the EME 70

    Walbro Carb

    Ceramic coated cylinders

    NSK main bearings

    IKO rod bearings

    Rcexl HV (6-12V) Ignition.

    Only 250mm Plug Cap to Plug Cap

    Same foot print as EME55/60 (DLE55)

    Same prop bolt pattern as EME55/60 (DLE55)

    18 Month warranty serviced right here by Mile High RC.

    Our customers also receive cost plus 10% for parts that would be non warranty such as crashes.


    Here are the specs on the engine:


    Eagle Master Engine EME 70 User
    Manual

    3

    Specifications
    Item Technique Data
    Displacement 70 cc
    Weight
    1800 g/Engine, 165 g/Muffler,
    190 g/Ignition Module
    Compression
    Ratio
    7.6
    Power 7.1 HP @ 7000 RPM
    Idle RPM 1200 RPM
    Practical RPM 1200 ~ 7500 RPM
    Thrust 1 18.0 kgf (50~200 m Altitude)
    Thrust 2 15.5 kgf (1800~2000 m Altitude)
    Spark Plug EME / NGK CM6
    Ignition Voltage 4.8 V to 12 V
    Fuel
    91~93 Octane

    1:30~1:35 Mix
    Ratio


    So what led me to buy this engine was two things 1) The engine will fit inside my cowl without cutting holes in the cowl for the spark plugs and 2) was the price difference between them and the other 70cc twin on the market. I could buy almost 2 engines for that price!

    So here are the pictures I took of the engine before mounting


    015.JPG 014.JPG 013.JPG 012.JPG 011.JPG


    The EME engine comes with a stick on template that had a circle and cross hair for proper alignment on the firewall, I took a ruler and extended the cross hairs to run the length and width of the template which made it much easier to get proper alignment, I stuck on the template decal and drilled the proper holes and they lined up perfectly. With the EME 70cc engine were included 13mm spacers (approx. 1/2"). Those proved to be too much and I found that it took approx. 1/4" spacing to get proper clearance for the cowl. Here is a picture of the decal on my firewall ready for drilling



    002.JPG



    Here is a few pictures of the engine mounted to the firewall



    012.JPG 011.JPG 010.JPG



    Here are a few pictures of the engine with the cowl installed. I did make baffling out of some hobby foam from the local craft store. It glues into the cowl easily with CA and keeps the airflow over the cylinders. I have never had a heating issue with it this way.



    005.JPG 004.JPG 009.JPG 008.JPG



    I did open up the canister tunnel and covers so I get airflow through the engine and still keep a nice clean look to the cowl.



    I have ran that engine for one season in this airplane. I can honestly tell you that I love this engine! It idles perfectly and extremely smooth, as a twin cylinder should. I am using a Xoar 24x10 laminated prop and fuel mixture of 35:1 ratio of natural oil instead of synthetic. I have never had a no start, hard start or dead stick with this engine. The airplane turned out at 19.2 pounds fueled and ready to fly which is a great weight for the EME 70. It has plenty of power, it will hover the airplane at half throttle and has great pull out! It sounds great. If you are in the market for a 70cc twin cylinder engine I think you should give this engine some serious consideration. Do not judge it from its low price but truly from a performance stance as well. It seems that with every flight of this airplane the engine gets stronger and stronger. I have about 7 gallons of fuel through this engine and all is good. During winter maintenance I did pull the pump cover off of the Walbro carb and cleaned the fuel screen and all looks great! If you have any questions you can ask me or [MENTION=298]Outofdenver[/MENTION] Mike email address is sales@milehighrc.com




    Here is a short video of my second flight and you can hear how solid this engine runs and sounds. I am sold and when I am in the market for another gas engine I will be looking at another EME engine for sure!!



    [video=youtube;K1lR9Fr8HWY]https://www.youtube.com/watch?v=K1lR9Fr8HWY[/video]
     
    Last edited by a moderator: Feb 29, 2016
    Bartman and Xtreme_Power_RCS like this.
  2. Xtreme_Power_RCS

    Xtreme_Power_RCS Staff Member

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    Great thread! I have heard a lot of great things about EME engines. And the fact you didn't have to cut the cowling makes it that much better. I hate having to butcher a cowl for any reason other then exhaust. Great review sir :first_place:
     
  3. Bipenut53

    Bipenut53 150cc

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    Thank you for the kind words!
     
    Xtreme_Power_RCS likes this.
  4. Bartman

    Bartman Defender of the Noob!

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    was actually hunting around for a 70cc twin yesterday......DA, older 3W's, and now this.......hmmmmm
     
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  5. Nutball

    Nutball 30cc

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    I haven't heard of ceramic coated cylinders before, it makes you wonder how long they will last, and if they are non stick to carbon like ceramic cooking pans. I would think break-in could take some of that coating off. I don't know much about gas engines, but 7.6 compression ratio seems on the low side. I thought most engines were around 8.something. I was surprised to find if I remember correctly volvo engines are somewhere possibly as high as 10.7 I think. Maybe they can get even more power out of these rc engines.

    They also ask for a lot of oil, maybe just to be on the safe side, but it does have 2 35cc cylinders, so maybe it needs more oil. What ratio do you use?
     
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