[NSRCA-discussion] OS1.40 Idle

[twtaylor]

Thanks Mike

 

I'm running 30% heli cool power fuel, OS F plug, 17x12 APC, Stock OS header
and pipe just installed as it came and never moved it. I was running a 3
blade and I didn't notice this problem as much with that prop. Ken might
have an idea as I removed the carb and pump from another engine and
installed it on this one but I used new gaskets. I might have not got the O
ring pressed tight enough to seal well. Think I'll try to richen up the low
end a bit as I've not changed it since I set the engine up when new to get
the transition correct. This engine has been a pleasure to run since new.
Wish my YS was as friendly. :-) 

 

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dr. Mike
Harrison
Sent: Monday, July 23, 2007 9:23 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS1.40 Idle

 

Tim,

2 things

1.  Your engine and/or idle is too lean.  If your exhaust is anything but
almost clear-very slight bit of tan, you are too lean.  

2.  Set your idle trim on a slider on the tx. and you can idle down for
landing.  Makes life much better and you have complete control of the idle
anytime.

3.  A third possibility is your pipe is too short.  I use the Macs header,
ES pipe and 2 more inches, whatever that is.

4.  the high idle can also be an indication the engine is getting too hot.
Look at all those issues.

 

Good luck 

Mike

----- Original Message ----- 

From: twtaylor <mailto:twtaylor at ftc-i.net>  

To: nsrca-discussion at lists.nsrca.org 

Sent: Monday, July 23, 2007 7:33 AM

Subject: [NSRCA-discussion] OS1.40 Idle

 

Morning boys and girls. I hope everyone made it home from the Nats safe and
sound. 

 

The subject this morning  is the Idle on a OS1.40. I've been flying this
engine for awhile now and I can't seem to get the idle to come down to
normal during landing. After the flight and set up for landing the idle
seems to hang high for about a minute (or it seems that long), The engine
will come down to the normal idle eventually but stays very high then is
slowly slows down to normal. Is this an indication that I've got the engine
too lean on the bottom? This makes landing as well as spin entry very
interesting. :-)

 

Any one else had this problem and come up with a solution?

 

Tim


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