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  #11  
Old 09-26-2012, 02:39 PM
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RVbySDI RVbySDI is offline
 
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Interesting that Bill and I are starting to sound like salesmen for ECi. Perhaps we should ask for a commission. Here is another ECi publication discussing differences between their engines:
ECi 320/340/360 comparison information
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  #12  
Old 09-26-2012, 02:48 PM
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The 340 uses 320 jugs and replaces the crank, rods, and pistons.
Info here: http://www.eci.aero/exp/retrofitkits/csh340.aspx

One useful piece of info I learned when researching the 340 stroker upgrade kits from ECI is that you can have the option of 7/16" prop bolt bushings in the crank flange to keep your 320 propeller, or 1/2" prop bolt bushings and use a 360 propeller.
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  #13  
Old 09-26-2012, 02:49 PM
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Quote:
Originally Posted by Lucky Clover View Post
It's a stroked 320 the only difference is the crankshaft.
Actually there are several other differences as well. The tapered fins is one of them. Because of the increase in the stroke length the height of the cylinder is slightly different. Depending on the type of induction you will have different sump configurations, also the materials used in the sump construction can be different.

An interesting point, I have noticed that ECi shows on their site the pistons are 8.34:1 for the IO-340 but I have the 9.0:1 pistons in my IO-340. Perhaps they have changed since I bought my engine in 2009.
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  #14  
Old 09-26-2012, 03:15 PM
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Cub Crafters does quite a few other things to their version of ECI's 340 to make it lighter still. They custom fab their own sump, use dual EI, a carbon plenum, and more... to scrape every ounce of weight out.
The CC340 while built from the ECI 340 kit, is it's own animal when it comes to accessories.

If you are serious about putting a really light engine in your RV, make sure you look hard at your CG limitations.

I think the CC340 would make a great RV3 power plant. The other models might be a little CG challenged and would take some serious re-engineering and thought to get right. I hope someone does it soon!
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  #15  
Old 09-26-2012, 03:29 PM
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Quote:
Originally Posted by RVbySDI View Post
...

An interesting point, I have noticed that ECi shows on their site the pistons are 8.34:1 for the IO-340 but I have the 9.0:1 pistons in my IO-340. Perhaps they have changed since I bought my engine in 2009.
I?m glad you said something about the compression ratio. That was the specific reason I didn?t go with the -340 and bought the -360 instead. I wanted the power but with a compression ratio that would allow me to burn premium auto fuel, if it came to that.

As for the tapered cylinders, it is my understanding that they are stock O-320 jugs but with tapered cooling fins, similar to what they did on the O-360 cylinders.
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  #16  
Old 10-17-2012, 11:55 AM
grub0927 grub0927 is offline
 
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Default 340 pistons

Cubcrafters uses the 9.0:1 piston that is normally reserved for injected applications. The carbureted 340 uses a 8.3:1 piston.

It's harder to understand the part numbers since the 75413 that is the low compression piston in the 320 and 360 becomes a high compression piston when used on the stroked motor. ECI uses p/n 75412 for the 8.3:1 piston in stroked engines (340, 370)

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  #17  
Old 11-18-2012, 11:53 AM
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Default Hmmm some corrections on CC340 engine

Most of the above info is correct, but let me clear up a few details on the CC340.
It is an engine that was developed for and certified to ASTM standards for LSA aircraft. Weight reduction took priority over power, but power was important as well. ECI makes most of the components, but CC makes the sump, and induction system, and all CC340s come with dual Plasma III Light Speed ignitions systems. The engines are assembled and test run at Aero Sport Power in B.C. They weigh about 43Lbs less than an equivalent Lyc O360A3A.
I believe you can have an engine builder such as Americas, or Aero Sport build the ECI 340 kit in many different configurations, but the CC340 is a 9,1 to 1 compression ratio engine with MA4SPA carb. There are no gears in the accessory case to drive such things as fuel pumps, or vacuum pumps since they are not needed in an LSA Cub, and these gears have WEIGHT. (and cost money, and fail occasionally, etc). The CC340 was run in a test cell at ECI for the certification and came out with a 2400 hr TBO.
The engines are very efficient with the slightly higher compression and electronic ignition. It is not uncommon (at altitude) to get 120 MPH on 6 GPH, or 20MPG. That is hard to do in a Cub type airplane.
ECI is a great progressive company that is continuing to work to lighten up these engines we all know and love.
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