[C320-list] Normal Performance Limits?

[BAdams3491 at aol.com]

Speed thru the water is the only one that matters...speed over ground is  
affected by tide, current, wind, etc., and is inaccurate when determining how  
the Yanmar is performing.
 
Bert
At Ease
#442
 
 
In a message dated 10/4/2008 7:37:45 A.M. Central Daylight Time,  
mcdonough5 at verizon.net writes:

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
>  






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