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If the MP is above 24" Hg the nominal timing is 23-24 deg BTDC but typically the MP will be lower than that while in-flight. The EC2/3 increases the advance below 24". This improves fuel economy. The lower the MP, the more the 'vacuum advance' is. Be aware of this if you are trying to set timing with a timing light (not recommended).
Tracy
On Tue, Nov 16, 2010 at 12:46 AM, <bktrub@aol.com> wrote:
Just triple checking- the timing for the 13B is 22~ 23 degrees btdc at 4000rpm, correct? Just fixing a few small things before getting out and flying/tuning. Weather is crappy here in Seattle so I'm going over the plane and engine again for a few days. I've got a few ideas as to why I can't seem to get it to smooth out through my staging area in flight, when it runs through the same area smoothly on the ground.
Brian Trubee
Rv-4
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