[C320-list] Normal Performance Limits?

[Jack McDonough]

I've had my 320 since it was new in 2003 and I have never run my Yanmar 27 
much more than 2600 or, rarely, 2800 rpm. With a three-blade prop, I'm 
probably doing about 6 knots over the ground. My recollection is that those 
rpms are about what the engine mounting plate and the Catalina manual 
suggest. Am I right or wrong?

Jack
#947




----- Original Message ----- 
From: "Monte B." <mjbc60 at sbcglobal.net>
To: <C320-List at Catalina320.com>
Sent: Friday, October 03, 2008 8:46 PM
Subject: Re: [C320-list] Normal Performance Limits?


>I didn't disagree with Rod. I reiterate, these instrument systems (tachs)
> are poorly calibrated and if you normally run your engine at a 
> conservative
> RPM and then firewall it you may expect to see smoke just from the higher
> exhaust gas temp burning combustion deposits out of the exhaust system. 
> That
> having been said I would agree that prop pitch controls max. RPM.
>
> Monte
> Laima #620
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of
> joe at dolphinmortgage.com
> Sent: Friday, October 03, 2008 8:32 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Normal Performance Limits?
>
> I agree with Rod, low RPM and black smoke with clean bottom & Prop means 
> it
> is overpitched. Should run at 3600 RPM at Max throttle.
> Joe Barrett
>
> -----Original Message-----
> From: Monte B. [mailto:mjbc60 at sbcglobal.net]
> Sent: Friday, October 3, 2008 08:53 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Normal Performance Limits?
>
> These boats also have notoriously inaccurate tach,s, something else to
> check. Monte Laima #620 -----Original Message----- From:
> c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Rod Boer 
> Sent:
> Friday, October 03, 2008 7:12 PM To: C320-List at Catalina320.com Subject: 
> Re:
> [C320-list] Normal Performance Limits? It sounds to me that you are over
> propped. You should be able to get up to 3400 RPM. Can you adjust the 
> pitch
> on the Kiwi? If so, just reduce the pitch and you should be able to get up
> to the full RPM Rod Boer Odyssey, #688 -----Original Message----- From:
> c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Amirault
> Family - S&B Sent: Friday, October 03, 2008 7:01 PM To:
> c320-list at catalina320.com Subject: [C320-list] Normal Performance Limits? 
> I
> had my boat on the water yesterday afternoon for likely the last sail of 
> the
> season. Although the wind was 15-20 knots on departure it had dropped to
> near nil by the time the crew decided to head for home. To ensure we 
> arrived
> at the dock before dark I slowly pushed the throttle to maximum. On still
> water this gave me revs at 2900, knots at 6.75 and plenty of black smoke. 
> On
> easing the throttle back to 2500 revs I was able to maintain 6 knots and
> eliminate the smoke. I have a Yanmar 3GM30, a clean bottom and a Kiwi 
> prop.
> Is this approximately normal? Brian Amirault #797 Waltzing Bear, too
>