[C320-list] calibration of my Tach

[brucestanley]

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