[C320-list] Tachometer

[Monte B.]

Barry,

The key to the puzzle is the max RPM no load. The prop pitch and disc size
control max RPM if they are higher and or larger than O.E.M. prop. The max
RPM in neutral is determined by the fuel control governor in neutral. I
would say your tach is a few bricks shy of a load. These tachs are
notoriously inaccurate so if the boat goes the right speed I would consider
that as the benchmark rather than 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 Kirk
McCullough
Sent: Sunday, August 03, 2008 1:51 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Tachometer

Barry

I have the Perkins and it revs to 3800 in neutral and I can get it up to
3250 in forward gear, at least according to my tachometer. This is about
what the manual says is normal. I would think your tach is not reading
properly if you are getting hull speed at an indicated 2450 rpm, because I
can't quite make hull speed at my indicated 3250.

Kirk
#124

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Barry Fahrer
Sent: 29 July 2008 05:43
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Tachometer


There was a thread a while back about using a hobby Tachometer to check the 
on board instrument.  Does anyone have the make and model of that device.
I believe my instrument panel may be off as I am only able to rev up to 2800

RPM in Neutral
and 2450 or so in gear with a 3 blade flex o fold prop.  The boat seems to 
make hull speed and I get no black smoke.  I have just over 700 hours on the

1994 Perkins.
Thanks for the help.
BARRY --... ...--
TRANSIT C-320  #126
GLEN COVE, NY