[C320-list] What is top RPM ?

[Jeff Hare]

I *should* have said that 3600 RPM is max engine speed, and I can't get
there in gear on my boat with my prop.  Technically Yanmar likes to see that
you can get to that rpm under load.  I'm sure my boat won't get much over
3450 in flat water, and probably most Yanmar 3gm30 320s don't do full RPM
under load either.

If you have lots of junk on the prop,  any kind of air restriction or
clogged fuel filter, you might have trouble getting higher RPM.   Cable
adjustment could be a problem too.

If you have a clean prop, no air or fuel restrictions and have good
compression then there's one very likely bet here:

A Carbon buildup restriction in your exhaust elbow.  It's definitely worth
inspecting as it may lead to engine problems should this be the case.   This
can happen if you run at low RPM a lot, since the exhaust doesn't get hot
enough to keep the elbow clear.  From what I've heard on this list, once
it's clogged, it's a replacement item, not a cleanout process.

Just a few thoughts...

-Jeff

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Joe Abbagnaro
Sent: Monday, June 23, 2008 4:14 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] What is top RPM ?

Jeff

Wow 3600 Max RPM .... I think Wide Open Throttle for me
is only 2900 RPM ..... Wonder if I have a cable adjustment problem....

Joe

On 6/23/08, catalina at thehares.com <catalina at thehares.com> wrote:
> Hmm...
>
> I have to admit that I closed my Yanmar manual as fast as I opened it.
> It's pretty much a steaming pile of bad english.  I never could find
> anything I was looking for in it.  Now, having a decent Shop manual
> written by people who both know how to write and also understand the
> engine would be worth looking at.
>
> But to answer Joe's question with a general response:
>
> 1) 3600 is MAX RPM
> 2) 3200 for a limited time (~hour or less)
> 3) 2200-3000 indefinitely.  (We motored for 9 hours straight once at
> roughly 2900 rpm and it purred the whole time.)  Well, that's what it
> sounded like with my hearing protection on... :)
>
> -Jeff H.
>
> > Orlando
> >
> > I know its there ..... but no not looked at in detail.
> > We have been working on other projects since we recently purchased  the
> > boat.
> > Installed a Garmin GPS, new ICOM DSC radio with remote MIC, New
> > Battery charger, and finishing up the Auto Pilot install. Guess I have
> > more homework to do .....  8^)
> >
> > Oh and also taking some time to figure out how to sail the boat ... 8^)
> >
> > Joe .
> >
> >
> >
> > On 6/23/08, Orlando.Duran at averydennison.com
> > <Orlando.Duran at averydennison.com> wrote:
> >> Take a look at the power curve...gives you an excellent view into RPM's
> >> vs fuel consumption....
> >>
> >> So what you're saying is that you've never actually looked at manual..
> >> :)
> >> ----------------------------------
> >> Regards,
> >> OD
> >>
> >> Sent from my BlackBerry Wireless Handheld
> >>
> >>
> >> ----- Original Message -----
> >> From: "Joe Abbagnaro" [jabbagna at gmail.com]
> >> Sent: 06/23/2008 12:41 PM
> >> To: C320-List at catalina320.com
> >> Subject: Re: [C320-list] What is top RPM ?
> >>
> >> Hi
> >>
> >> I do have the Manual, did not know that info was in there.
> >> I thought there was a formula needed to do the claculations.
> >> I will check out the manual see waht info I can find out.
> >>
> >> Joe
> >>
> >> On 6/23/08, Orlando.Duran at averydennison.com
> >> <Orlando.Duran at averydennison.com> wrote:
> >> > You don't have a Yanmar operator's manual?
> >> >
> >> > Probably a good to idea to open it and at least browse thru, has a
lot
> >> of good info about the engine that's in your boat...
> >> >
> >> > Never know when you need to know stuff about your engine and you're a
> >> long ways away from the internet...
> >> > ----------------------------------
> >> > Regards,
> >> > OD
> >> >
> >> > Sent from my BlackBerry Wireless Handheld
> >> >
> >> >
> >> > ----- Original Message -----
> >> > From: "Joe Abbagnaro" [jabbagna at gmail.com]
> >> > Sent: 06/23/2008 12:33 PM
> >> > To: C320-List <c320-list at catalina320.org>
> >> > Subject: [C320-list] What is top RPM ?
> >> >
> >> > What should be my wide open RPM ?
> >> > What RPM should I cruise at ?
> >> >
> >> > I have Hull 574
> >> > Yanmar 36M30F 27hp
> >> > Kenzaki Transmission 2:2:1 ratio
> >> > Standard 3 blade prop 15/11
> >> >
> >> > Thank You
> >> > Joe
> >> >
> >> > - -----------------------------------------------------------------
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