Bore glazing again

Re: Running in reverse

They don't lay em like they used to. Have you ever noticed the nice plastic mooring buoys on the bend to The Bag in Salcombe? I thought they were lost buoys until I looked close up and saw they were still attached to very large concrete sinkers! When I laid my own mooring years ago in Poole (30ft boat then) the mooring was 2 x 110lb Danforth style anchors with 100' of ex coalmine lift chain (about 1" thick links) between them and light chain (well 3/4 inch) up to the swivel and 3/8in chain over the bow roller. With that I felt that I could go full astern with my 10hp Bukh without worrying.

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To Summarise

Lots of interesting comments. It therefore appears that you should:

1. Always run an engine up to full operating temperature
2. Use the right oil CC or CD for most marine engines (non turbo)
3. Change the oil regularly

Runing under light load may not bring the engine up to temp.

Conform to the above and you should be ok.


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Re: Running in reverse

We were in a secluded anchorage one night in which there was a mooring owned by a cruising club tucked into a little bay bit. Just before evening a well known to us approximate 70 foot heavy displacement power boat came in (runs fishing and "we will look after you" type cruises) motored up to the mooring, decided it was a bit close to land for their liking, grabbed it and backed it out into deeper water for the night - didn't see them go in the morning but the mooring seemed to be back in its proper place again!

By the way when you motored astern on the mooring did you rotate around it from the prop walk? I have never tried it on a mooring but I know we do on the end of the anchor rode (which is much longer of course).

John

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Re: To Summarise

about right, just that if the design is right and the thermostats are working right you will reach correct operating temperature whether loaded or not.
i am still convinced the myth arose because of bad design or conversion of engines and that they ran too cool.
stu

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Double entendre.

Given the diversity of opinion, experience and anecdote, perhaps Scuttlebutt IS the right place for this after all .

But the point Vyv was making (I think) is that Scuttbutt is for more trivial pursuits and perhaps the 'Practical' board is a better place for this subject.

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Re: Double entendre.

if anyone is short of cc/cd oil, there is a small oil co in the forest of dean (forest lubricants) who make diesel oil to this spec using base single grade oils and additives from the US. they have been doing it for many years and I'm told they used to supply the large local bus company.

I am trying them out this time round so cannot recommend one way or the other.. price is quite reasonable.

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Re: Stand by for incoming

I motor less than anybody I know! I just do alot of miles. I work full-time but spend every weekend on the boat and all my holidays. Have done 3500 miles in the boat in the last 2 seasons with 260 hours on the engine. Most of the engine hours are just getting in/out of harbour

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Re: Stand by for incoming

I was pulling your leg, though now you write down the figures there's I imagine you've got a much bigger engine than mine. My 1GM10 uses abt 1 litre per hour, so if I'd motored for 260 hours I would expect to use 260 litres = (35x260/100) = £91 pa.

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Re: Stand by for incoming

Thats pretty impresive fuel consumption. I motor at about 2500-2800 rpm. This gives me 6-7 knots. The engine is a 30 hp Yanmar pushing a 37 ft cat of 5000kg.

She uses about 3/4 gallon per your at these revs. If I slow her down to 2100 revs, about 5 knots, she uses 1/2 gallon per hour. I just get bored at this speed!

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Re: Stand by for incoming

£750 each way?! I know that the deisel at Pwllheli is expensive (especially after the stopped berth-holders buying direct from the Aber Oils tanker) but don't think it would cost that much.

Ours (42ft) costs probably £100-£150 each way, so a 50+footer is about double that.

Or, have some powerboaters lived up to the stereotype and accidentally ended up in Galway as opposed to Dublin?

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Re: Stand by for incoming

ps as for the main point of the post...are the engines those big green things in the back of the boat? Always did wonder.

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Re: Stand by for incoming

And that pretty heavy consumption.

I have a Perkins 4236 75HP in a 14 ton 40 footer. - 7 knots at 1700 rpm in flat conditions gives approx 1 Galls/PH into a head sea/wind (say F7) at 6 knots will take around 3 GPH.

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