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serenitymay1995
Joined: 16 Dec 2007
Posts: 89
City/Region: Cumberland
State or Province: BC
C-Dory Year: 2001
C-Dory Model: 22 Cruiser
Vessel Name: Gumption
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 Posted: Wed Mar 26, 2008 11:34 pm Post subject: tach question |
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| we have a 22 cruiser with a 75 honda. when running at wot our gps speed is 28 mph trimmed out, prop is 13.5 by 15. our tach reads 3400 rpm and at cruise of 19.8 mph it reads 2800 rpm. this is obviosly wrong, is there an adjustment on the tach or anywhere else? |
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colobear
Joined: 23 Jan 2005
Posts: 2154
City/Region: Denver
State or Province: CO
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Photos: C-Cakes
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| Posted: Thu Mar 27, 2008 1:14 am Post subject: |
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Not as far as I know. Sounds like you are running way below design WOT if the tach is to be believed. You might try generating a speed curve by going up in 500 RPM increments from idle, measure speed and rpms, see if the rpms are a relatively smooth curve until they start to flatten out. Are you using the factory prop? Sounds like a dealer question.
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Patti and Barry
formerly C-Cakes, now
rving around N. America |
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cemiii
Joined: 26 Feb 2008
Posts: 419
City/Region: Alamo
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Angler
Vessel Name: The Last One........ III
Photos: The Last One, III
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| Posted: Thu Mar 27, 2008 1:29 am Post subject: |
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you may be able to find someone with an electric multimeter with tac capabilities adjustable for your #cylinders, pull the cowl tap a plug wire and have someone read the rpms as an accuracy check. just an idea.
I have an angler 22 loaded to the gills with heavy stuff and heavy people and we run 28 wot on an old johnson 70 2/s running on a 14x11p prop. you may have too much prop. |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Thu Mar 27, 2008 2:30 am Post subject: Re: tach question |
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| serenitymay1995 wrote: | | ...... this is obviosly wrong, is there an adjustment on the tach or anywhere else? |
I don't know about your Honda, but some tachs have a setting on their reverse side that can be set for a different number of cylinders, i.e., 3, 4, 6, etc.
Worth looking for anyway!
Joe.  
_________________
Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
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Almas Only
Joined: 09 Nov 2003
Posts: 364
City/Region: Richmond
State or Province: VA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: Alma's Only
Photos: Alma's Only
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| Posted: Thu Mar 27, 2008 5:49 am Post subject: tach |
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SERENITYMAY
The tach instruction manual has been sent to you by email. Let me know if there are any problems with the transmission.
Good luck.
Alma's Only
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2003 CD22 Cruiser with Honda 90 |
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