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Brison 2.4 tach numbers

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Old 10-10-2004, 10:15 AM
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rkingmanila
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Default Brison 2.4 tach numbers

i've got a slightly used Brison 2.4 off of **** and its taching at 6700rpm with a 20x8 avionica prop. does this sound about right?
Old 10-10-2004, 05:24 PM
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Geistware
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Default RE: Brison 2.4 tach numbers

You should get 7200 with an APC 20x8 propeller!
Old 10-14-2004, 12:27 AM
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Default RE: Brison 2.4 tach numbers

Geist: what could be wrong. i live in the pacific where it is very hot and humid. maybe about 300feet elevation where i fly. could this be causing me to get only 6700rpm or is it just because the engine is new and not really run in yet.
Old 10-14-2004, 12:29 AM
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Default RE: Brison 2.4 tach numbers

btw: i'm using unleaded gasoline with around 95octane. is this too high?
Old 01-24-2005, 12:03 PM
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blue ice
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Default RE: Brison 2.4 tach numbers

I just bought used Patty Wagstaff with a Brison 2.4 on it. It has a 22x10 prop on it. Brisons website says 20 inch prop for this engine. Should I change this prop? Also, what would be the difference in a 20x8 verses a 20x10?
Thanks for any replies.
blue ice
Old 01-25-2005, 10:31 AM
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Geistware
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Default RE: Brison 2.4 tach numbers

Sorry Guys, I missed this response and finally saw it.
A couple of things can be done. I assume you have a mechanical advance.
On 95 octane, try advancing the ignition pick-up ring by screwing the ball coupler in/out (which way I can't remember)
This will make it harder to start but give you more power up to a point.

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