Is this a good .074?  
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All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> Is this a good .074?
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Is this a good .074? - 5/26/2008 7:46:36 AM   
Big Al-RCU


 

Posts: 354
Joined: 2/24/2003
From: Slidell, LA, USA
Status: offline 		Hi guys,
I picked up a used Norvel .074 a year or so ago but just got around to bench running it last week. The compression seemed less than I expected. There is NO pinch at TDC and compression is weak when hot. The only 7-3 prop I had was a wood Zinger. I was disappointed to get only 12,500 on 25% fuel.
My Tower order arrived with more props and I get 16,500 on an APC 7-3. (I since found a Zinger 6-4 wood in my stash which turned 18,000).
This is the engine as I received it, with one shim which measures 0.008.

My question is: does this sound reasonable for a used (abused?) engine? I was looking for another 1,000 RPM or so on the APC 7-3. Any comments?
Thanks,
Al

       Post #: 1

RE: Is this a good .074? - 5/26/2008 8:06:46 AM   
combatpigg



Posts: 9824
Joined: 11/22/2003
From: arlington, WA, USA
Status: online 		Al, you're a tough guy to please! 16,500 with a APC 7x3 is what I usually get. I run mine on 15%. After a few runs some get loose enough to hit 17,000+

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to Big Al-RCU)
       Post #: 2

RE: Is this a good .074? - 5/26/2008 9:13:55 AM   
Big Al-RCU


 

Posts: 354
Joined: 2/24/2003
From: Slidell, LA, USA
Status: offline 		CP thanks for the come back,
Sounds like this engine is in at least average condition. I was concerned about the weak compression. I intend to put it into a Herr Extra that I have had for awhile in spite of all the negative comments that it will be under powered. I didn’t want to start out with an engine that was over the hill. And yes, if I don’t like it I will swap in a .15, but as they say ‘there is a principle at stake.’ Just have to see for myself.
Al

(in reply to combatpigg)
       Post #: 3

RE: Is this a good .074? - 5/27/2008 3:47:26 AM   
DeviousDave


 

Posts: 434
Joined: 2/25/2007
From: , MI, USA
Status: offline 		If you are worried about it, you can get new piston/cylinders from Lite Machines for a very attractive price, and they come with a mostly complete heli engine attached!

(in reply to Big Al-RCU)
       Post #: 4

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All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> Is this a good .074?
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