REFLECTOR: Running LOP

[michalk]

Well, I beg to differ.
In my case, I used a molten lead reference and ice bath to calibrate 
each probe.  Each probe also has a 0degree reference in the circuitry. 
When installing, I welded the probe bungs at equal distances from the 
exhaust port, and installed them at the same distance into the exhaust 
stream.  This is the assumption I was making for my statement.

A carbureted engine does not necessarily have bad distribution.  I would 
bet that well tuned carbureted motorcycle engines have very good 
distribution.  My comment was in the theoretical, not necessarily 
related to aircraft engines.  There are cases where my statement does 
not hold true, but they are anomalies, like detonation and such.

Scott Derrick wrote:
> I'm talking absolute temps here.
> 
> Even EGT's can mean many things, even power distribution is not one of 
> them.  In fact if your engine is carbureted or you do not have balanced 
> injectors you can bet you do not have even power distribution no matter 
> what your egt's are registering.
> 
> Uneven EGT's, the most common reason is caused by placement and exhaust 
> flow, and  usually has nothing to do with mixture or power 
> distribution.  The only time a wild egt is connected to power in a 
> cylinder is if its detonating not firing at all.
> 
> Scott
> 
> Brian Michalk wrote:
> 
>>Well, they mean something.
>>Assuming the probes weren't "trimmed" to give even results and are 
>>reporting actual EGT's, then even EGT's mean even power across cylinders.
>>
>>Uneven EGT's can be caused my two things:  Uneven mixing of the 
>>air/fuel, and uneven airflow to the different cylinders.  Cylinders that 
>>breathe better will make more power, and thus higher EGT's.
>>
>>Different mixtures will result in peak EGT's at different temperatures.
>>Different airflow will result in different cylinder to cylinder EGT 
>>measurements.
>>
>>Chuck Jensen wrote:
>>  
>>
>>>Joel,
>>>If you are using a 'normalizing' function with the VM1000, then even EGT
>>>bars mean nothing.  If you are not using a 'normalizing' function with
>>>the VM1000, then even EGT bars mean nothing.  Either way, even EGT bars
>>>mean nothing.  However, as you progressively lean out your engine, if
>>>all of your EGTS peak at the same fuel flow (well, within 0.2-0.5 GPH
>>>anyhow) then you are good-to-go.  In that case, you don't need GAMI, you
>>>need to thank your lucky stars.
>>>
>>>As Scott will advise you in spades.  The peak temperature of each
>>>cylinder is totally irrelevant!!  The only thing that counts is the fuel
>>>flow at which each cylinder reaches its peak temp, irrespective of what
>>>that temp is.
>>>
>>>Chuck Jensen
>>> 
>>>
>>>
>>>-----Original Message-----
>>>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>>>Behalf Of Dr. Golf
>>>Sent: Monday, January 01, 2007 8:58 AM
>>>To: Velocity Aircraft Owners and Builders list
>>>Subject: Re: REFLECTOR: Running LOP
>>>
>>>
>>>Thanks Kieth.
>>>If using the VM1000 engine monitor, all the cylinder
>>>bars are at the same level after leaning, what would
>>>the advantage be if I changed to the Gammi injectors?
>>>Joel
>>>
>>>
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>>
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>>
>>
>>  
>>
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