So when you use a laser/optical tach to check the boat's tachometer, where do you put your reflective mark? On the prop shaft? The main pulley?
Wade On Thu, Jul 19, 2018 at 3:25 PM, Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > 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 <cnc-list@cnc-list.com> 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, cnc-list-requ...@cnc-list.com wrote: >> >> Message: 1 >> Date: Thu, 19 Jul 2018 13:40:06 -0400 >> From: Josh Muckley <muckl...@gmail.com> >> To: "C&C List" <cnc-list@cnc-list.com> >> 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 < >> cnc-list@cnc-list.com> >> 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, < >> >> cnc-list@cnc-list.com> 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) >> >> bwhitm...@sbcglobal.net >> >> >> >> ------------------------------ >> >> *From:* Wade Glew via CnC-List <cnc-list@cnc-list.com> >> >> *To:* cnc-list@cnc-list.com >> >> *Cc:* Wade Glew <wadeg...@gmail.com> >> >> *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, < >> >> cnc-list@cnc-list.com> 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 <muckl...@gmail.com> 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 > > >
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