Big hp?

tunaorlater

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My friend is building a 46 Wesmac and currently looking at the c-18 1135hp cat. What are the other options out there for this kind of power? He has not ordered the motor as of now but the hull is being layed up so he will soon I just want to make sure it's the right call. Thanks
 

Blitzen

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MAN and Detroit MTU
 

badabing

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isnt cummins debuting a 16 liter fairly soon. the giant 16 liter lugger looks real nice also
 

WoundUpMarine

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tunaorlater

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He is being told 27 knots, he'll be happy with less. Fully enclosed bridge is going on.
 

Blitzen

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Forgot to mention earlier that Milton Cat does have a bunch of new 1000HP C-15 if he wants one of them. I guess they are the last ones.
 

Marine Nut

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Has you friend considered thinking a tad out of the "East Coast" box? You did say he wants to do it right?

IMO, he needs to consider twins on a boat of this size set up a little different than the "one size fits all" thing that seems to be the status quo.


Wes
 

MDI45

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Forgot to mention earlier that Milton Cat does have a bunch of new 1000HP C-15 if he wants one of them. I guess they are the last ones.
Hey Blitz,Is Stu Tuttle still the marine guy there..i would love to repower with one of them
 

Blitzen

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Hey Blitz,Is Stu Tuttle still the marine guy there..i would love to repower with one of them

MDI,
Stu is still around up in Maine when he wants to be. It is the Milton Cat in Medford Mass that has the engines. They bought the last of them when production ended. I still can't believe they put such a hole in their line-up like that. Who wants to put that monster C-18 in a boat with all the extra weight for the same HP, it is a twin turbo and the cost is through the roof.
 

Blitzen

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123k with a gear for the c-18. Wtf!

That was the number I got, so for about 23k you get a much larger engine that weighs a lot more with an extra turbo and then you have to deal with the exhaust issue. It really adds a lot more cost to a build. I know Cummins is coming out with something but can't get any sort of time line on the release and who wants to be the first one to test it out for a 100+k.
 

captainlarry84

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Agreed

I concur; the C-18 CAT is the correct power for the 46. My Buddy did a repower on a 50 Henriques with a part of C-18s. 30 knots. The motors are a diamond. Quiet, a good fuel burn and very clean running. Wes Mac uses CATs a lot so there will be no guess work with the install. I know the 42s run great with the C-15
 

petrel

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One would think 1000hp would be aplenty, but if you can afford a brand new pimped out Wesmac, I guess you can afford the fuel. Somehow I can't relate and I don't think I'm alone there. I thought the 46' version pushed better than the 42', but I guess it's a matter of more room to put weight.....
 

Frank Grimes

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Highest HP rating for the C15 was 865 from what I recall. Also a twin turbo engine. Does anybody know what the running weight of the C18 actually is? CAT's published specs run a 500 lb range.

I wouldn't think MAN engines would be a popular choice for a downeast as the maintenance, acquisition and fuel costs would be very high, but I'd love to see the V12 1360HP MAN in a 46 Wesmac, to see what kind of speed she'd get.

**EDIT** I could have sworn I saw a spec sheet at one point that had the high HP C15 (865bhp) as a TTA engine. Just went on the CAT website, it's listed as TA. Thoroughly confused.
 
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captainlarry84

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gearing

The key with big HP is the correct reduction gear. Low RPMs small reduction high RPMs large reduction. The gear is the key to get the rubber to meet the road.

Examples:
A 2200 RPM motor in a DE 1:5 shaft speed 1467
A 2800 RPM motor with a 1:77 or 2:0 shaft speed 1581 or 1400
A 3300 motor with a 2.5 shaft speed 1320

With these combs the shaft speed is about the same. And shaft speed is the key to good performance
 

Eslang

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The key with big HP is the correct reduction gear. Low RPMs small reduction high RPMs large reduction. The gear is the key to get the rubber to meet the road.

Examples:
A 2200 RPM motor in a DE 1:5 shaft speed 1467
A 2800 RPM motor with a 1:77 or 2:0 shaft speed 1581 or 1400
A 3300 motor with a 2.5 shaft speed 1320

With these combs the shaft speed is about the same. And shaft speed is the key to good performance
What is the ideal shaft cruise speed for a downeast?
 

captainlarry84

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No real rule on this. My thoughts would be about 1200 RPMs on Cruise. Nice
& slow giving that large wheel plenty of time to scoop the water onto the blades and push that DE forward with little slippage.
 

Blitzen

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What is the ideal shaft cruise speed for a downeast?

As Capt Larry stated keep things truning slow to avoid wear and tear and vibration issues. Try to achieve your desired cruise speed at the top of the torque curve for best efficiency.
 

tunaorlater

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When I spoke with Spencer Lincoln a few years ago he told me ideal cruise shaft speed for my 36nb is 1200 to 1250. And a 28 inch 3 blade wheel would give me my best performance. That was 610hp but he said the shaft speed should be that same for any engine in that hull.
 
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