[C320-list] Max RPM on Yanmar YM30

[bruceheyman at cox.net]

Crosby,
The black smoke is typical from rapid acceleration and overloaded engine.  It is actually unburnt fuel.  You got that smoke because the engine was trying to run faster than the engine could turn the prop.
We usually don't get black smoke till about 3200 rpm.
Bruce
Somerset 671 SoCal
Sent via BlackBerry by AT&T

-----Original Message-----
From: Crosby Roper <vmdatsea at hotmail.com>

Date: Wed, 30 Jul 2008 06:52:27 
To: c320-list at catalina320.org<c320-list at catalina320.org>
Subject: [C320-list] Max RPM on Yanmar YM30


Hi All,
 
I have hull # 1054  a Yanmar YM30 On our way down the coast from Oceanside to San Diego, I ran the engine at high RPM's for a few minutes. The engine has about 200 hrs on it and is well maintained. We have a 3-blade fixed prop, original factory version. All was well until we ran the RPM's up to 3200 and got brown smoke from the exhaust. We typically run the engine at 2500-2700 RPM. Does anyone know the max RPM for this engine? (I know it's in the manual orlando, but the manual is on the boat and I'm not :)) Was the brown smoke a sign of engine overload? Any cause for concern? Thanks for your help.Crosby Roper, VMD
Hull # 1054 Tethys
San Diego, CA
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