REFLECTOR: First long Cross Country

[Mark Magee]

Hi John,
Your issues with detonation are troubling me. I ran a Rose EI on a Long EZ years ago and know that at 11,500 I was 41DEG advanced with a reduced fuel burn of about 15%. We in the San Diego EZ squadron designed the advance curve and Rose burned it in. 
How did you find out you were detonating?
Detonation could lead us back to our Glide Distance thread. I don't believe there are any working knock sensors out the for a LYC/CONT EI, yet it seems to me that retarding back to mag advance will kill the fuel savings advantage of an EI.
I'd appreciate any additional data on EI advance curve and detonation you've uncovered

Mark B. Magee
N34 XL
Sent from IPhone 4

On Jun 22, 2012, at 8:39 PM, John Dibble <aminetech at bluefrog.com> wrote:

> Cruise altitude depends on the weather.  On a rare SKC day I fly 9500/10500.  On a partly cloudy day, there are bound to be cloud tops to 13000, requiring O2 if you want to stay above the cloud bases where the air is far smoother.   When solid overcast, it's usually smooth air below the ceiling.
> I'd go with the lesser advance timing, or even no advance at all until you determine how much advance is right for your engine.  I have one Rose EI on my Franklin and I had detonation damage from too much advance.  I ended up disabling the advance and setting the EI to the same advance as my mag.
> 
> John
> 
> On 6/22/2012 6:23 PM, Richard J. Gentil wrote:
>> 
>> I am planning on taking my first long trip in my Normally Aspirated, Dual EI, MT, IO-390, SERG. Going from Naples, FL to Norfolk, NE. (Day VFR. Not ready to test her in IFR yet.)
>> 
>> I figure I can make it with one stop to stretch the legs and relieve the bladder. 
>> 
>> My question is cruising altitudes. (I can take an O2 bottle if there is any good gain by going up 16,500 or 17,500). 
>> 
>> What altitudes do you find most efficient etc for a Velo. 
>> 
>> I have two timing advance curves with my E-Mag and P-Mag. I am currently using curve A as set by the factory not tried curve B yet. (I have not hooked them up at an EICAD yet.)
>> 
>> 
>> 
>> 
>> I would be very interested in your recommendations. 
>> 
>> Richard
>> 
>> Sent from my iPhone 4 Classic
>> 
>> 
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