Reply
 
Thread Tools Search this Thread
 
Old 11 November 2008, 13:52   #1
Member
 
Country: UK - England
Town: STOKE
Boat name: Humma
Make: Humber Destoyer 5.5
Length: 5m +
Engine: Out b 75 hp Marriner
MMSI: 235068231
Join Date: Sep 2005
Posts: 229
RIBase
Rev counter Problems

Hi
Only used the boat Humber 5.5 rib once so far been mostly on the drive, since buying a month ago,fitting it out with Gps and Vhf, but noticed the Rev Counter does not return to 0 its on nearly 1000 rpm mark.
If it does not read correctly with engine stopped can I expect a correct reading when running?
It is a Mercury Gauge working off a Mariner 75 hp 2 stroke
Thanks Stuart
__________________

__________________
Stuart
stul is offline   Reply With Quote
Old 11 November 2008, 14:19   #2
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,112
stuart - i think some tachos are specifically intended not to sit at zero when the power/signal is off. its supposed to protect the mechanics?
__________________
Poly is offline   Reply With Quote
Old 11 November 2008, 14:49   #3
Member
 
Country: UK - England
Town: STOKE
Boat name: Humma
Make: Humber Destoyer 5.5
Length: 5m +
Engine: Out b 75 hp Marriner
MMSI: 235068231
Join Date: Sep 2005
Posts: 229
RIBase
Quote:
Originally Posted by Polwart View Post
stuart - i think some tachos are specifically intended not to sit at zero when the power/signal is off. its supposed to protect the mechanics?

A friend of mine Top banana said something like that as well, he is usually knows what hes on about, but thought I ask

Thanks Stuart
__________________
Stuart
stul is offline   Reply With Quote
Old 12 November 2008, 09:24   #4
J S
Member
 
Country: UK - England
Town: N.Wales/Southampton
Make: Zodiac
Length: 3m +
Engine: Honda 15hp
Join Date: Mar 2006
Posts: 449
Quote:
Originally Posted by stul View Post
A friend of mine Top banana said something like that as well, he is usually knows what hes on about, but thought I ask

Thanks Stuart
Usually if you just turn the ignition on they will go back to zero, I think reason for staying at around 1000 is thats what the engine rpm is when you switch it off.

James
__________________
J S is offline   Reply With Quote
Old 12 November 2008, 10:29   #5
Member
 
Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
Quote:
Originally Posted by J S View Post
Usually if you just turn the ignition on they will go back to zero, I think reason for staying at around 1000 is thats what the engine rpm is when you switch it off.

James
Yes, it's a 'feature'.
__________________
alystra is offline   Reply With Quote
Old 12 November 2008, 11:45   #6
Member
 
Nasher's Avatar
 
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,147
When I finally upgraded to a boat worthy of a Revcounter a few years ago I embarassed myself by taking a Revcounter back to the shop I'd just brought it from. I knew it was a used one, but had been told it had been fully tested.

I'd got back to the car, opened the box and found the needle at about 1500rpm. I went back in all stroppy and demanded another one that wasn't broken.
The assistant explained the situation and even flashed it up to a battery in the workshop to prove his point.

As I understand it the needle will stop at the point at which it loses a signal. which at the right point in the cycle can even cause it to drop below 0.

Nasher
__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 13 November 2008, 06:50   #7
JSP
Member
 
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
Mine stays at 1000 when there's no power to it too.
__________________
JSP is offline   Reply With Quote
Old 13 November 2008, 07:58   #8
J S
Member
 
Country: UK - England
Town: N.Wales/Southampton
Make: Zodiac
Length: 3m +
Engine: Honda 15hp
Join Date: Mar 2006
Posts: 449
Quote:
Originally Posted by JSP View Post
Mine stays at 1000 when there's no power to it too.
It will just stay at whatever revs the engine is doing when you switch it off.

James
__________________
J S is offline   Reply With Quote
Old 13 November 2008, 08:05   #9
JSP
Member
 
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
Nope, tried it a few times when I was out yesterday after reading this thread. No matter what it always goes to 1000 even if the revs where below that.
__________________
JSP is offline   Reply With Quote
Old 13 November 2008, 16:18   #10
Member
 
Country: UK - England
Town: STOKE
Boat name: Humma
Make: Humber Destoyer 5.5
Length: 5m +
Engine: Out b 75 hp Marriner
MMSI: 235068231
Join Date: Sep 2005
Posts: 229
RIBase
Well thanks for the interest shown, I see one or two have similar reading, my main concern is, if the reading at the top end 5000 + revs is correct and I can rely on this, my 75hp Mariner engine plate states 5,250 rpm
Stuart
__________________

__________________
Stuart
stul is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:28.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.