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Old 27 October 2003, 07:19   #31
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Originally posted by Richard B
And I'm not an accountant DM. ..."

Back on the subject, trip to Alderney and back was 180miles total, minus 25 miles to the fuel berth gives 155miles. I've just filled up and it was 177 litres. So 1.14 litres per nautical mile. And that's giving it some serious wellie. Well, as much as I dared anyway. Add the 2-stroke oil, which was roughly 6 litres (over the total 180 miles) so a litre of oil seems to do about 30 nautical miles. Yam 200hpdi of course, so completely irrelevant to Opti v 4-s debate, but a "starter of ten"

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Old 27 October 2003, 07:22   #32
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And your input, Mr Manning?
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Old 27 October 2003, 07:27   #33
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And your input, Mr Manning?

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Old 27 October 2003, 07:28   #34
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Ah, that was your input, then!
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Old 27 October 2003, 13:50   #35
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Originally posted by Richard B

So come on down you 4-stroke boys, how does that compare?
Ok, my last trip to Ramsey, and back around the coast made me use 34 litres of petrol according to the petrol pump at Tesco - at least all this gives me clubcard points

That day, the GPS reckoned we had done 54.9 nm, which equates to 1.61 miles to the litre. Although we were trundling along doing 4 or 5 knots through the Bitches (while I had my lunch), a lot of that travelling was done in excess of 25 knots, sometimes cruising upto 35 knots to smoothen the ride out a bit.
This does not include 20mins of idle time whilst getting the boat ready in the marina, and cooling down after returning from higher rev use. I don't use oil, so can't show that I'm afraid

I think the worst I've had is around 1.2 miles to the litre when I had 8 people on board, towed another rib back to Dale, and then had 30 mins of pushing flat out all the way back up river after dropping the tow off..... it does seem to average better than 1.4 miles to the litre though depending on how much fun I have with the throttle.

Ideally, it'd be great to have one of those fuel flow meters - every time I fill the tank up is different - sometimes I can get it filled right to the top, other times, if the boat is leaning back a bit, I am unable to get the last litre or two into the tank.

During the summer, although I haven't done any really long trips like you have done Richard, I've found that anything over the 30knot mark seems to eat a lot more fuel - between 25 and 30 knots seems to be where the engine is most happy, and running at around 4500 revs.

I'd be interested to know what Martin Stacey gets on Bob now

-Alex
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Old 28 October 2003, 12:02   #36
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Have done a number of trips this year of between 30 and 50 miles. On a reasonably flat day with 4 up on the boat and running at around 30Knots (4200rpm) I can average 1.7 miles per litre with my 75 four stroke. WOT only reduces this to 1.5 miles per litre.

I am now another person on the Opti v 4 stroke dilema. Had already decided to upgrade to the Mariner 115 four stroke over the winter to give me a bit more top end. But then Mariner announce the 115 Optimax. They have a claim on thier web site on the 135 as follows

"GOES FURTHER
An OptiMax 135 yields at least 20 percent more miles per gallon and an average of 26 percent greater cruising range than even a competitive 130 hp 4-Stroke–when cruising between 20 and 40 mph. Which translates into better overall fuel economy and fewer stops at the pump. "

So, better acceleration, lower fuel consumption (when cruising)......only got to factor in the cost of oil now.
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Old 28 October 2003, 12:14   #37
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115 mariner 4S is a good engine...should go like the clappers on your boat.....and no oil to mess about with.
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Old 28 October 2003, 13:02   #38
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For the sake of an objective statement in this thread on behalf of modern 2 strokes, I will tomorrow, put myself through the inconvenience of a high speed run to Cowes and back to measure the mileage and consumption.

As this is a statistical test I will endevour not to enjoy myself!

I definitely believe that the Opti's come into their own re consumpytion when you push them hard. The last time I had a petrol car I seem to remember that it was ok at 50 mph but pretty juicy near the redline.

Richard if I read your maths right then you have a fuel/oil ratio of around 30:1 that seems a bit steep to me. 60:1 would be more like it 100:1 would be better. But if it is 30:1 I'd by a big drum if I was you

I'll answer the personal stuff later, you little rascal you
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Old 28 October 2003, 13:04   #39
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Oops! Wrong terminology. Thx Daniel.
Not the first mistake you have made during the course of this thread I fancy!
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Old 28 October 2003, 13:51   #40
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I will tomorrow, put myself through the inconvenience of a high speed run to Cowes and back to measure the mileage and consumption. As this is a statistical test I will endevour not to enjoy myself!
I should think not... I'll get my snipers out to shoot at any Welsh Scorpion pilots seen smiling.

Your maths looks good to me - I was a bit upset when I realised it was burning 30:1 Never mind, I know where a Southampton guy keeps a big barrel of oil. That should do the trick. Just a thought - as you use Optimax oil, do you use Optimax petrol as well?
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