REFLECTOR: Running LOP

[Andrew Ellzey]

Thanks Steve and Dave for your input. I suspected that a person could use 
numbered drills to adjust the orifice size but wanted someone else to chime 
in before I opened my mouth. It is interesting to hear that the Gami 
injectors aren't any different than the Lycoming injectors. I have moved 
lycoming injectors around to help balance cht and egt temperatures before, 
but always stopped short of opening up the orifices.

Andy


----- Original Message ----- 
From: "Dave Philipsen" <velocity at davebiz.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, December 16, 2006 10:27 PM
Subject: Re: REFLECTOR: Running LOP


> Andy,
>
> Even though your question was directed to Steve, I thought I might jump
> in and give you some information I have learned.  I've communicated via
> email with a guy who owns a Cessna Cardinal which has a Lyc. IO-360
> engine.  He claims that he has tuned his injectors by finding the first
> cylinder to peak (when leaning) and then removing the injector and
> "worrying" the orifice open just a little bit with a miniature drill
> bit.  He also mentioned that he has tweaked his injectors to the point
> where he has a maximum of 0.3 gph difference between the richest and the
> leanest and thinks if he tried he could get it down to 0.2 gph or less.
> I think the orifice size would put you in the range of a #69, 70, or 71
> drill and you apparently have to be very careful that you don't ream out
> too much.  He said he went overboard on one of the injectors and had to
> end up buying a brand new one from Lycoming and starting over.
>
> I've had my injectors out and I experimented with some miniature drill
> bits just to see how they fit without actually drilling the orifice.  In
> doing so, I did find out that some of the injectors fit the drill bit
> snugly as I slid it in and others had notably more "play" indicating
> that they weren't all *exactly* the same size.  I would imagine the
> difference was less than .001 inch though.
>
> I'm in the middle of an engine annual right now and also fitting a Dynon
> EFIS to my Velocity.  But as soon as I get the Dynon wired to the CHTs
> and EGTs I plan on doing the same thing and tuning the injectors to
> attempt to get them all to peak at very near the same time.  This should
> allow the engine to run smoothly on the lean side of peak.  Right now, I
> can run LOP with just a little roughness that is tolerable.
>
>
>
>
> Andrew Ellzey wrote:
>> Steve,
>>
>> Can you elaborate on how you are tuning your injectors?
>>
>> Andy Ellzey
>>
>
> -- 
> Dave Philipsen
> Velocity STD-FG
> N83DP
>
>
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