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Old 26 August 2008, 13:44   #11
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Vipermax 6.2 with Rude DI 150 with a WOT speed of about 39 knotts with a 19" prop.

I too was a little disapointed, but nearly always run with over 100 litres of fuel on board and I guess she has had a few pork pies stowed away .
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Old 26 August 2008, 17:47   #12
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Thanks for the comments - I'm having trouble understanding how the Suzuki 140 would produce such a different top end from the opti 135 - hole shot or acceleration I could imagine - but nearly 10 kn difference in top speed??

Over the next few weeks I'll get a diagnostic run on the engine, check the height (which I think is OK), weigh the boat, see how it runs with a lighter load then think about trying a stainless prop.

Any other ideas greatly appreciated.
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Old 26 August 2008, 19:43   #13
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135 Opti is a 2.5 litre, V6 2-stroke (de-tuned 175hp)
DF150 Soozook is a 2.9 litre in-line 4cyl, 4-stroke. (de-tuned 175hp)
DF140 Soozook is a 2.1 litre in-line 4cyl, 4-stroke.
Some say Soozook brought out the DF150 'cos the DF140 can't produce the full box of horseys.
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Old 26 August 2008, 21:11   #14
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Ok I didn't realise the opti was a V6. I'm aware of the chatter about the DF 140 output, but I thought that had been disproved, although having a quick look on the web I couldn't find anything definitive.

Did find some comments that the setup is pretty sensitive to props and needs to be mounted with the cav plate 2-3 inches above the bottom which seems a bit higher than other setups.

Also seems that many people feel the need to run them near WOT, which is OK 'cause they are quiet, economical and have a 5 year warrantee.

But I'm getting a pessimistic feeling that I'm going to get a lot more from it.
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Old 27 August 2008, 12:03   #15
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I too had heard of Suzuki's being a little bit opimistic on the engine badge for the 140. But on the opposite side of things the Evinrude bought out the HO brand that offers something above the quoted HP.

Wonder what the limits are in HP difference you need to comply with advertising, trade description etc?
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Old 27 August 2008, 16:47   #16
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And under what conditions - I doubt that they would be allowed to market it with a major difference (I read somewhere it was less than 6%), and they supposedly all have to be tested under the same conditions.
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Old 27 August 2008, 17:18   #17
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forgot to mention. im not running at max rpm yet, got to try and squeeze another 400revs somehow
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Old 27 August 2008, 18:26   #18
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Quote:
Originally Posted by Top banana View Post
forgot to mention. im not running at max rpm yet, got to try and squeeze another 400revs somehow
Hmmmmmm
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Old 27 August 2008, 19:21   #19
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Quote:
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forgot to mention. im not running at max rpm yet, got to try and squeeze another 400revs somehow
Yeh, but you might not get any more speed! I assum you're going to find a prop to give you those extra revs?
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Old 27 August 2008, 19:27   #20
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forgot to mention. im not running at max rpm yet, got to try and squeeze another 400revs somehow
Mine's the same - most I've seen is 5200rpm
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