RCU Forums - BME 50vsBME 44

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davewallace

07-31-2005 05:45 PM

BME 50vsBME 44

Hello,
Does a BME 50 have a greater increase in power over a BME 44 then the displacement increase would indicate? Dose anyone know if there are port timing differences? I realize that the weight is about the same and carb size is the same.

Dave

flyinrazrback

07-31-2005 06:05 PM

RE: BME 50vsBME 44

I have seen a 44 run, and owned a 50. The 44 runs a 19x8 or 20x8, and the 50 turns a 22x8 or 22x10, significant difference in power.

mglavin

07-31-2005 06:13 PM

RE: BME 50vsBME 44

I don't know if port timing was changed, I doubt it. The only difference is cubic displacemnt to the best of my knowledge. Simply put there is NO substitute for cubes...

Remember the BME 44/50 are basically Echo/Kiorsk chain saw engine shortblocks adapted to aero use by BME...

ifshnee-RCU

08-01-2005 06:31 AM

RE: BME 50vsBME 44

Gee FLRZBK:
I have a 44 and am running a 22-8 with great success
ifshnee

ZAGNUT

08-01-2005 04:41 PM

RE: BME 50vsBME 44

the 44 and 50 may look similar but they aren't. the 44 is a bored and maybe stroked version of an older 39cc model while the 50 is a totally new design. echo has now added a bit more displacement to the original 50 too. and i'm not 100% sure but the above mentioned 39cc might also be a bored/stroked version of a 36cc...to lazy to look the info up though

the 44 also has a 12mm crank while the 50 is 15mm

dave

davewallace

08-01-2005 05:07 PM

RE: BME 50vsBME 44

Quote:

ORIGINAL: ifshnee-RCU

Gee FLRZBK:
I have a 44 and am running a 22-8 with great success
ifshnee

Hi ifshnee,
Do you know what RPM it is turning?

Dave

bodywerks

08-01-2005 05:13 PM

RE: BME 50vsBME 44

The 44 is also over a half pound lighter. If you are looking at putting it in a 13-14 pound plane, the 44 would be ideal and would keep the wingloading down.

ifshnee-RCU

08-02-2005 06:56 AM

RE: BME 50vsBME 44

Dave;
Gee I'm sorry, I did not take reading. I was using a mejslik 20-10 & just not getting the performance I needed on a 17lb edge. While at field a mate was using a BME 50 and had this BME 22-8 prop & he changed to a 22-10. I bought the 22-8 (BME prop)for $18. On a whim I put her on the 44 & had significantly better performance with the plane. Because it was a whim, I did not think to take rpm, but ear said it was not significantly lower. Hope this helps.
ifshnee

davewallace

08-02-2005 08:50 AM

RE: BME 50vsBME 44

Quote:

ORIGINAL: ifshnee-RCU

Dave;
Gee I'm sorry, I did not take reading. I was using a mejslik 20-10 & just not getting the performance I needed on a 17lb edge. While at field a mate was using a BME 50 and had this BME 22-8 prop & he changed to a 22-10. I bought the 22-8 (BME prop)for $18. On a whim I put her on the 44 & had significantly better performance with the plane. Because it was a whim, I did not think to take rpm, but ear said it was not significantly lower. Hope this helps.
ifshnee

Wow! That is real useful information. So maybe the performance difference between the two engines goes down with the right prop. You probaby don't want to use the 22x8 until the engine is well broken in.

Thanks, Dave

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