??? echo engine question  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Conversions >> ??? echo engine question
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??? echo engine question - 8/31/2008 10:16:37 PM   
cfaw10


 

Posts: 89
Joined: 9/27/2006
From: pilot mountain, NC, USA
Status: offline 		I have an echo conversion that I think is a 25cc (measured bore x stroke) with a cdi ignition and an 11mm walbro carb. I'm getting 8600rpm with an APC 14x6 and 8000 with a Topflight 14x8. I know the APC puts out about 8.5 lbs of thrust at 9400 on an O.S. 91 4stroke, and I'm looking for 10 - 11 lbs from this echo. My question is what are some of your rpm and thrust readings with various props? I'd like to know if I can get this kind of thrust from this engine before I go out and buy a handfull of $15 props to experiment with.

Thanks.
       Post #: 1

RE: ??? echo engine question - 8/31/2008 10:32:02 PM   
av8tor1977



Posts: 2779
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline 		A 15 x 8 or 16 x 6 APC prop should get you where you want to be.

AV8TOR

_____________________________

If it's not scary, it's NOWHERE NEAR powerful enough!!

(in reply to cfaw10)
       Post #: 2

RE: ??? echo engine question - 8/31/2008 10:35:28 PM   
microsprint9



Posts: 437
Joined: 11/20/2004
From: london, ON, CANADA
Status: offline 		If you need more thrust i would be looking at a bigger diameter prop, even on my 21cc weedeater i was running a 16x8 (7000rpm) and a 17x6 ( 7200rpm), 14" is just too small for an engine that size especailly if you are needing more thrust.

(in reply to cfaw10)
       Post #: 3

RE: ??? echo engine question - 8/31/2008 11:14:44 PM   
cfaw10


 

Posts: 89
Joined: 9/27/2006
From: pilot mountain, NC, USA
Status: offline 		Thanks, guys. I'll try that this week.
Looking at putting this on a Funtana 100.

(in reply to microsprint9)
       Post #: 4

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