[C320-list] FW: Re: Tach reads only 3000 rpm at full throttle

[Jim and Stacey]

Thanks for the suggestions.   I had a diver clean the bottom and especially
the prop.  RPMs right back up to 3650 at full power.  Eng. Temp back to
normal.   I wish boat problems were all so simple .  .  .     
Jim Bredar, "Ranger", C320 #937




-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Jim and Stacey
Sent: Wednesday, August 29, 2007 12:41 PM
To: 'C320-List'
Subject: Re: [C320-list] FW: Re: Tach reads only 3000 rpm at full throttle

Thanks for the responses.    I guess its time to grab the scraper and mask
take a little dive.    I'll report back.   Jim Bredar, "Ranger", C320 #937

-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Karl Mielenhausen
_/) 
Sent: Wednesday, August 29, 2007 11:21 AM
To: C320-List at catalina320.com
Subject: [C320-list] FW: Re: Tach reads only 3000 rpm at full throttle


Jim,

I concur with Chris. I had the exact same problem (could not develop 3600
rpm). Also was running hotter than usual, but then again our river is
currently 85F. Cleaning the prop of barnacles solved both problems.



Karl Mielenhausen

2000 C320 Hull#690 "Silver Lining"

New Bern, NC

http://pages.suddenlink.net/kmielen/

From: Chris Burti [mailto: clburti at gmail.com]

To: c320-list at catalina320.com

Date: Tue, 28 Aug 2007 22:28:46 -0400

Subject: Re: [C320-list] Tach reads only 3000 rpm at full throttle



Barnacles on the prop will do that fairly suddenly.On 8/28/07, Jim and
Stacey <bredar-sewell at comcast.net> wrote:> I have a 3GM in my 2003 C320,
Hull no. 937.   I have 300 hours on the> engine.   Full throttle has always
yielded a tach reading of just over 3600.> Yesterday I noticed that with the
throttle full forward, the tach reads only> 3000 rpm.     What gives?   I
don't have a keen enough ear to say whether> the engine sounds like it is
actually at 3600 even though the tach says> 3000.    Thoughts and
suggestions appreciated.>> Jim Bredar, "Ranger", C320 No. 937, Oxford,
Maryland>>>> -----Original Message-----> From:
c320-list-bounces at catalina320.com>
[mailto:c320-list-bounces at catalina320.com] On Behalf Of brucestanley> Sent:
Tuesday, August 28, 2007 5:42 PM> To: C320-List> Subject: Re: [C320-list]
calibration of my Tach>> Thanks Jeff> your explanation is appreciated.>>
BruceStanley>> ----- Original Message -----> From: "Jeffrey Hare"
<Catalina at thehares.com>> To: 
"'C320-List'" <c320-list at catalina320.com>> Sent: Wednesday, August 29, 2007
12:24 AM> Subject: Re: [C320-list] calibration of my Tach>>> > The Yanmar
3GM series engines use a pickup on the flywheel to handle the> > Tach
instead of the terminal on the alternator, so those with the 3GM> > engine>
> don't usually have any re-calibration necessary when changing
alternators.> > Given that you probably have the 3YM engine, it appears that
they aren't> > using the flywheel pickup anymore in favor of the Tachometer
terminal on> > the> > back of the Alternator like they do for the other
non-yanmar engines on> > the> > C320.> >> > -Jeff> >> > -----Original
Message-----> > From: c320-list-bounces at catalina320.com> >
[mailto:c320-list-bounces at catalina320.com] On Behalf Of brucestanley> >
Sent: Tuesday, August 28, 2007 3:14 AM> > To: C320-List;
oldman1030 at hotmail.com; sthompson at toad.net> > Subject: [C320-list]
calibration of my Tach> >> > Hi All> > re: the calibration of my Tach after
I 
switched from the Hitachi 60Amp> > to an older Hitachi 80Amp. The 80amp Alt
produced far higher Tach> > readings.> > This I solved by a terminal wiring
alteration to the back of the Tach.> > This terminal was straight forward. I
did this approx 14 mths ago.> > I am far from an electronics expert, but
that is exactly what I did.> > I am a DIY advocate and love doing most of my
own work on my Yacht.> > Parts I do not understand and parts I break. I
still enjoy the journey.> >> > BruceStanley C320#1084> > Sydney Australia>
>> > ----- Original Message -----> > From: "Chris Holt"
<oldman1030 at hotmail.com>> > To: "C320-List" <c320-list at catalina320.com>> >
Sent: Monday, August 27, 2007 9:48 PM> > Subject: Re: [C320-list] Club
Racing the C320> >> >> >> That was what I had thought also.  I also did not
experience any> >> perceived> >> >> change of my tach readings after the
installation.  I have a 1997 with a> >> 3GM motor.> >>> >> Bruce,  maybe you
experienced this because of a 
different setup on the> >> 3YM> >> >> engines.> >>> >> Chris> >>> >> -----
Original Message -----> >> From: "Scott Thompson" <sthompson at toad.net>> >>
To: "C320-List" <c320-list at catalina320.com>> >> Sent: Sunday, August 26,
2007 7:09 PM> >> Subject: Re: [C320-list] Club Racing the C320> >>> >>>I
don't know about the newer or older boats, but on my 1999 boat there is>
>>>no need to recalibrate the tach when switching alternators.  That's>
>>>because on the Yanmar 3GM series of engines, the tachometer reading
comes> >>>from a sensor in the flywheel housing that counts the flywheel
teeth as> >>>they rotate past.  In these engines tachometer calibration has
nothing to> >>>do with the alternator.> >>>> >>> Scott> >>>> >>>
brucestanley wrote:> >>>> Hi Stephen> >>>>> >>>> re Kiwi Prop and Engine
Revs> >>>>> >>>> Fantastic Lady's 3YM30 cruises at 2100 to 2900 rpm.> >>>>
Depending on tide/wind, this delivers 4+++ to 6+ knotts.> >>>> Occasionally
I advance the Revs to 3000 and 3300rpm.> 
>>>> Sometimes to 3500++RPM for only a few minutes.> >>>> Revs are a bit of
a lottery, in that one hopes the Catalina Tach is> >>>> calibrated
accurately.> >>>> I am reasonably sure they are close to correct on
Fantastic Lady.> >>>> Note: if you change your alternator you have to make a
change at the> >>>> Tachometer.> >>>> I have an 80amp Hitach Alternator and
have made this change.> >>>>> >>>> You must be able to Rev to 3600RPM
(Yanmar's requirements).> >>>>> >>>> Hope this helps> >>>>> >>>> Bruce
Stanley> >>>> C320  #1084 Fantastic Lady / Sydney Australia> >>>>> >>>>
----- Original Message ----- From: "Stephen Cox" <scox at timmin.com>> >>>> To:
"'brucestanley'" <brucestanley at optusnet.com.au>> >>>> Sent: Thursday, August
23, 2007 1:30 PM> >>>> Subject: RE: [C320-list] Club Racing the C320> >>>>>
>>>>> >>>>> Thanks Bruce.> >>>>>> >>>>> What revs can you get your motor up
to with this prop?> >>>>>> >>>>> Stephen Cox> >>>>> Canberra> >>>>>> >>>>>>
-----Original Message-----> 
>>>>>> From: c320-list-bounces at catalina320.com> >>>>>>
[mailto:c320-list-bounces at catalina320.com] On Behalf Of brucestanley> >>>>>>
Sent: Thursday, 23 August 2007 8:20 AM> >>>>>> To: C320-List> >>>>>>
Subject: Re: [C320-list] Club Racing the C320> >>>>>>> >>>>>> Stephen>
>>>>>>> >>>>>> My Kiwi prop is 16.5"> >>>>>> and The factory has set the
angle at 22 degrees.> >>>>>> This pitch setting of 22degrees is based on the
engine you have.> >>>>>> Mine is the Yanmar 3YM30.> >>>>>>> >>>>>> Bruce
Stanley> >>>>>> C320  #1084 Fantastic Lady / Sydney Australia> >>>>>>>
>>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> >> >> >> >>>>>-- Chris
BurtiFarmville, NC

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