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Old 16 October 2004, 18:14   #51
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Look at the post above yours nobba! it's '85 that the yanks started doing as the Japs had done for years, and rated/advertised the power 'at the prop'.
Try and keep up!
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Old 16 October 2004, 18:42   #52
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Now call me old fashioned!

Now hang on a minute Nobba , fgt nobba and not junior assistant nobba. The post above the post above the post above this one ,herinafter known as he post above (cubed). Seems to me to be in direct contradiction with the post above this one. (herinafter known as the post above this one )

I have some confusion.

In the post above (cubed) you clearly state that power is crank( not prop) rated and is in line with the way outboards have been measured since 1985. To me this infers that outboard power is measured at the crank shaft and not the prop shaft (by this I mean the bit of splined metal wot drives the screw).

In the post above this one you sate that the power is measured at the prop.

The last time I was this confused was when somebody pointed to two shovels and told me to take my pick.
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Old 16 October 2004, 19:31   #53
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Na,what I was trying to say was, the 300 Yanmar, is actually 315 crankshaft horsepower, by the time it gets to the prop, it's probably in the region of 285/290, in other words, the Yanmar 300, is very nearly 300 at the prop, like OB's from '85 onwards.

now stop being fkkn awkward
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Old 17 October 2004, 03:42   #54
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Doh!

Quote:
Originally Posted by Jonny Fuller
Look at the post above yours nobba! it's '85 that the yanks started doing as the Japs had done for years, and rated/advertised the power 'at the prop'.
Try and keep up!
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Old 17 October 2004, 05:15   #55
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Quote:
Originally Posted by jwalker
That's the problem with crash courses.
Well never said that I will start modifying outboards my self

Quote:
Originally Posted by jwalker
Packing out the crankcase used to be done to increase the charge pressure and, hence, the combustion chamber pressure but it doesn't increase the compression ratio. In modern 2 strokes, there's not much space in the case to pack, but maybe it's still done.
Thanks for the info JW
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Old 17 October 2004, 06:42   #56
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Had a Maico 125 in a racing kart (quite a while ago now!) with packed crankcases - also improved the response a bit along with shortening the bellmouth on the carb and some other mods - it stopped very quickly when the stuffing tried to come up the ports!
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When a boat looks that good who needs tubes!!!
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Old 17 October 2004, 08:29   #57
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...it stopped very quickly when the stuffing tried to come up the ports!
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Old 17 October 2004, 08:52   #58
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Just out of curiosity what the term 'staffing' means. How do the 'satff' an engine. It sounds strange to me.
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Old 17 October 2004, 12:39   #59
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Quote:
Originally Posted by Jonny Fuller
Na,what I was trying to say was, the 300 Yanmar, is actually 315 crankshaft horsepower, by the time it gets to the prop, it's probably in the region of 285/290, in other words, the Yanmar 300, is very nearly 300 at the prop, like OB's from '85 onwards.

now stop being fkkn awkward
you thinking of moving to Gloucester?

Ok so basically all outboard since 85 have had their power measured at the prop. Which was the American manufacturers way of coming into line with the Japs who had been doing it for years?

Is this a correct understanding
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Old 17 October 2004, 13:58   #60
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Yup
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