[C320-list] calibration of my Tach

[brucestanley]

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
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
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