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Doug, I have a Lycoming 0-290-D2 in a 1954 Tri-Pacer. Below is a link to Service Instruction, SI 1132B … I think you’ll find the spark advance on this engine is much less than you are used to; my engine is timed to 18 degrees BTDC as per
this document.
Jeff
http://www.lycoming.com/Portals/0/techpublications/serviceinstructions/SI%201132B%20%2806-18-2010%29/Magneto%20Drop-Off.pdf
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From:
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dlomheim@aol.com
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Subject:
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Off Topic Lycoming Question...
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Date:
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Tue, 18 Mar 2014 13:59:15 +0000
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To:
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"Rotary Aircraft List" <flyrotary@lancaironline.net>
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I have finally finished the restoration of an RV-3A that sat for 12+yrs in a hanger here in OK. After to flights now I have two engine issues I'd love to have some feedback on from
the smart engine guys on the list! I'm running an O-290G that has been modified to a "D" config. Minus the crankshaft. The airboat guys run this engine w/the timing at 28 deg. (Vs 26 deg) BTDC and it has the original Marvel 3A carb that it flew w/for it's
first 150 hrs. My two big issues are the EGT is constantly redlined at RPMs above 2300. I attempted leaning it on the last flight, and it didn't drop the temps at all. Additionally, the CHT has never hit more than 200 degrees and it has a sparkplug sender
which I have read should read about 40 higher than actual if using a bayonet style in the cylinder barrel. Anyway, I need to verify the temp calibration of the gauges, but I wonder if there is something on the spark / timing side I also should consider here
as I trouble-shoot it further...
Thx for any ideas!
Doug Lomheim
RV-3A flying!
RV-9A w/13B ready for some attention this Summer!
Sent on the Sprint® Now Network from my BlackBerry®
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