22-06-2012, 03:47 PM
Completely doable. You need to look into marinisation of engines...
Best way to cool them is simply with a water>water exchanger, you cannot run raw seawater through the cooling system, it'll corrode away, so you need two loops, one raw loop and one normal loop.
To start with use the XUD9A - marinize that, then go from there... You can then do a turbo lump, but you'll need to think a lot about the intercooling, you'll probably end up wanting to get another loop going that cools the charge down... Or even having a bigger pump that goes through two heat exchangers, one for the main cooling system, one for the charge cooling loop.
Then you need to work out how you're going to get drive out to a gearbox. Then you need to work out servicing intervals - engines don't like being run flat out for long periods of time, XUDs were never meant to do it from the factory, the Nasp ones will be fine, but the turbo models are a bit highly strung for that, you'll probably find that they will be shagged after a few hundred hours. You might find you'll need to get a pump test bench in and recalibrate the pumps, probably to drop the RPMs mostly, you don't want an XUD9 spinning at 4750rpm all day, it'll pop, you'll probably want to derate the turbo engines to 80hp and get the power out of it at lower RPMs so it can swing a steeper pitch propeller.
Remember, yes they are plentiful, but you can't have one being unreliable. I would say you're talking the standard power figures for the XUD9A if you can get them producing their power at 3500rpm... Drop that to probably 80hp or so or the turbo ones.
For an old reliable engine, they're not bad, but you may want to look at other engines which may be better suited to marine applications... Yanmar are making a 110hp 2.0 16v Turbodiesel - but it makes that power at 3200rpm, of course, you'll be paying Yanmar tax on that because... It's a Yanmar.. Same with Volvo Penta...
Going from what Sam says, the gears are actually really easy, all you do is use a Teleflex controller, which you pull backwards and it yanks a gear lever, then the further you push it it actuates the throttle, middle is neutral, then forwards, it pulls the gear cable into forwards and then the further you push, you get more throttle.
You need a marine gearbox which has one forward gear and one reverse gear and a neutral, in the future you might even look towards a Z-Drive/LegDrive whatever they fancy calling it these days...
Best way to cool them is simply with a water>water exchanger, you cannot run raw seawater through the cooling system, it'll corrode away, so you need two loops, one raw loop and one normal loop.
To start with use the XUD9A - marinize that, then go from there... You can then do a turbo lump, but you'll need to think a lot about the intercooling, you'll probably end up wanting to get another loop going that cools the charge down... Or even having a bigger pump that goes through two heat exchangers, one for the main cooling system, one for the charge cooling loop.
Then you need to work out how you're going to get drive out to a gearbox. Then you need to work out servicing intervals - engines don't like being run flat out for long periods of time, XUDs were never meant to do it from the factory, the Nasp ones will be fine, but the turbo models are a bit highly strung for that, you'll probably find that they will be shagged after a few hundred hours. You might find you'll need to get a pump test bench in and recalibrate the pumps, probably to drop the RPMs mostly, you don't want an XUD9 spinning at 4750rpm all day, it'll pop, you'll probably want to derate the turbo engines to 80hp and get the power out of it at lower RPMs so it can swing a steeper pitch propeller.
Remember, yes they are plentiful, but you can't have one being unreliable. I would say you're talking the standard power figures for the XUD9A if you can get them producing their power at 3500rpm... Drop that to probably 80hp or so or the turbo ones.
For an old reliable engine, they're not bad, but you may want to look at other engines which may be better suited to marine applications... Yanmar are making a 110hp 2.0 16v Turbodiesel - but it makes that power at 3200rpm, of course, you'll be paying Yanmar tax on that because... It's a Yanmar.. Same with Volvo Penta...
Going from what Sam says, the gears are actually really easy, all you do is use a Teleflex controller, which you pull backwards and it yanks a gear lever, then the further you push it it actuates the throttle, middle is neutral, then forwards, it pulls the gear cable into forwards and then the further you push, you get more throttle.
You need a marine gearbox which has one forward gear and one reverse gear and a neutral, in the future you might even look towards a Z-Drive/LegDrive whatever they fancy calling it these days...
