I know for a fact that mine runs about 200 rpm low. I bought a laser tach from the link below. I take that into account. Replacement doesn't make it better. Mine has been low since new. It doesn't come off the alternator either. It is a stock unit that had a pickup off the flywheel.
AGPtek® Professional Digital Laser Photo Tachometer Non Contact RPM Tach https://www.amazon.com/dp/B004Q8L894/ref=cm_sw_r_cp_apa_-kpuBbJVJTJCK Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Jul 19, 2018, 3:09 PM Tom Buscaglia via CnC-L ist <[email protected]> wrote: > The accuracy of original tachs can be problematic. I’m pretty sure mine > reads 4-500 rpm low. Near the top of the “ replace soon” list. > > Tom Buscaglia > S/V Alera > 1990 C&C 37+/40 > Vashon WA > P 206.463.9200 > C 305.409.3660 > > > On Jul 19, 2018, at 11:14 AM, [email protected] wrote: > > Message: 1 > Date: Thu, 19 Jul 2018 13:40:06 -0400 > From: Josh Muckley <[email protected]> > To: "C&C List" <[email protected]> > Subject: Re: Stus-List Yanmar 3HM35F Exhaust riser/goose neck > Message-ID: > <ca+zacrbufau5rf1btanz7lf+ftbz4t03h-rhh-wxch4msm2...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > The Yanmar manual does have some guidance on page 44. > > > https://drive.google.com/file/d/0B8pEh5lnvP1yenJtR1BxWjhqZGs/view?usp=drivesdk > > Josh > > On Thu, Jul 19, 2018, 10:47 AM Wade Glew via CnC-List < > [email protected]> > wrote: > > Ok. So my engine is a Yanmar 2GM20F. I find the vibration "sweet spot" for > > motoring is about 2200 rpm. Sounds like I should be pushing it harder > > trying to find a sweet spot at a higher rpm? I can't recall what the > > tachometer range is on my boat. I've also had someone mention pushing the > > engine up to a high rpm before shutting it down for what reason I don't > > know. Lastly, I notice truckers never shut off their engines immediately > > after a highway haul. Should I idle my engine before shutting down after a > > long motor. > > Thanks for your thoughts. > > Wade > > Oh Boy C&C 33 MKII > > > On Thu, Jul 19, 2018, 09:22 Bruce Whitmore via CnC-List, < > > [email protected]> wrote: > > > Hello Wade, > > > Essentially it means running the engine at relatively high RPMs (I've > > seen the number to by 85% of full speed) whenever reasonable, in gear and > > avoiding running the engine solely to charge the batteries. > > > Bruce Whitmore > > 1994 C&C 37/40+ "Astralis" > > (847) 404-5092 (mobile) > > [email protected] > > > > ------------------------------ > > *From:* Wade Glew via CnC-List <[email protected]> > > *To:* [email protected] > > *Cc:* Wade Glew <[email protected]> > > *Sent:* Thursday, July 19, 2018 10:09 AM > > *Subject:* Re: Stus-List Yanmar 3HM35F Exhaust riser/goose neck > > > Hi Josh, > > Being relatively new to the sailboat business can I please ask what you > > mean by "keeping the engine load as high as possible" with regard to Soot > > accumulation? > > Wade > > Oh Boy C&C 33 MKII > > > On Sat, Jul 14, 2018, 16:24 Josh Muckley via CnC-List, < > > [email protected]> wrote: > > > I was pleasantly surprised, that after 5 years of use and no service, the > > elbow was in no way clogged with soot. I believe this to be a result of > > regulatory keeping the engine load as high as possible. > > > Josh > > > On Sat, Jul 14, 2018, 5:11 PM Josh Muckley <[email protected]> wrote: > > > It is original to my ownership (6 years), who knows prior to that. > > Replaced with "stainless" from ebay. > > > Josh > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
