2nd hand engines

[byron]

I have a mate who is going to remove his Perkins HT6.354s from his Broom Sedan and replace them with engines that will be almost twice the power. He has done the costing at £22,000
How much does the forum value the Perkins at? He reckons to get circa £3,000 for the pair. They are in good nick, well looked after and only done about 2,000 hours.

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[ccscott49]

I reckon for a pair of perkies, they have to be worth 3 grand, especially as they are well looked after, with boxes, they should be worth more. Are they turboed or natural? It's a pity englander already has new engines, or I'd have them!

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[Renegade_Master]

I assume the sedan is semi dis Byron twice the power?? what increase in speed baring in mind the
limitations of the hull

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[Duster]

I am sure he will get that for them easily, there is a large export market to the third world for this engine. Also they are widely used on static plant and irrigation pumps in the uk.
Regards mikej

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[pheran]

Byron. I think you will find that T6354s were fitted to the Sedan, not HTs. ie they are vertical and not (nearly) horizontal. Which rules out all those Ocean 37s, Broom Continentals and Crowns that might have offered a second-hand market. Mind you, vertical is a bit more conventional so might appeal to others who didn't have them as original equipment. Any thought that the 'third world' might be an opportunity is way off beam. They don't have any money!! And they don't care about the condition - huge amounts of piston slap is considered the norm and they can get them running without manifolds etc to power water pumps, generators etc. I was offered £150 each for two working BMC lumps for export to India. Mike should try and sell his to boaters. With all the specialist marine bits on them, they should be worth 3K to somebody.

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[byron]

The Sedan has a Vee hull. Oh! and MikeT if you are reading this... you know the boat.

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[Blue_Blazes]

What horsepower are they?

Bill.

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[byron]

They are HT6.354s which are 145hp each and turbo charged.

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[byron]

Ooops! Mike Haley is standing behind me as I write. Yes! Chris, you are right they are the uprights, that is the T6354s Oh! and incidentally he will be selling them with the gearboxes.

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[andyball]

wd think £3k the pair with gearboxes was a bit cheap actually if they're any good.

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[byron]

What he is going to do is offer them for sale while they are in the boat so dudes can see and hear them running. I think that is a great idea.

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[pheran]

When I re-engined the previous PHERAN, I kept meticulous records of every penny spent, down to the last washer and even tips for delivery men (there's another 10p wasted!) Mike might to note that at the final totting up, total project costs were 26% more that the cost of the engines themselves. And another thought that came to me in the wee small hours of the morning was, with that sort of increase in power, will he need to increase the size of his prop shafts. If so, hes got an absolutely rotton job of cutting the old stern tubes out, alligning the new ones and glassing them in etc etc . Altho' I just about doubled the power in my boat, I escaped this as the shafts already catered for the maximum power the baot was capable of handling and I hadn't reached that limit. But I have never come across a 500hp Sedan!! There is a very simple formula for calculating shaft requirements but I can't for the life of me remember it. Thats the problem with getting old......................................(voice trails off into a whisper)

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[byron]

He's done his homework, you know how meticulous he is. For a start the footprint is exactly the same as his T6354s. The price includes installation

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[Bejasus]

A reasonably accurate and reliable rule of thumb states that propshaft diameter should be one fourteenth of propeller diameter.

Actual Formula:

D = cube root ( ( 321,000 x SHP x SF ) / ( St x RPM ) )


SHP = Shaft Horsepower
SF = Safety Factor (3 for yachts, 5 - 8 for commercial / racing)
St = Torsional Shear of shaft material 9 stainless is 20,000
RPM = Shaft RPM

I think 321,000 is a mathematical constant for the formula.


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[pheran]

Sounds like a very good price for supply and fit (and the dreaded VAT, I assume)
for engines of that size. Obviously not Volvos then /forums/images/icons/smile.gif

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[ccscott49]

Shaft size is dependant on prop size and then of course on the speed you rotate them at, slow rotation, big props, big shafts, small props, fast rotation, small shafts and of course the material the shaftfs are made of. Roughly!

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[pheran]

Yes! Very, very roughly - you need to be just a bit more precise than that if you are doing the job for real. Bit like Houston saying the Moons up there somewhere, innt. And altho' hOO's formula wasn't the one I was given to work with, it does contain some of the same components. Using his and assuming not-untypical parameters of engine power output of 250bhp@3000rpm, a safety factor of 3, gear reduction 2:1 (and allowing nothing for power losses in the gearbox itself - because you don't know what they are) produces a shaft diameter of around 2". It seems unlikely that Brooms would fit this size in a boat designed for 145's so Mike would be well advised to check.

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