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#31
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"Franz Eckert" wrote in
. dk: Tell me, just to make me real ****ty overhere, what is the comon price on two used disel engines, around 70-100 HP, with gear and everything? I bought a used Perkins 4-108 with all controls and transmission from someone on the rec.boats.cruising newsgroup in North Carolina for $US1200 with 700 hours on it. It's been powering Lionheart ever since. Runs great. It's only 50hp, though, but that should give you some ideas. http://www.tadiesels.com/used.html#MENG That should give you an idea of what they're charging on this side of the pond. -- Larry |
#32
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"Glenn Ashmore" wrote in news:1pMOe.30$dm.3@lakeread03:
Lean engines run hotter which heats up the injectors more which heats up the fuel more. Er, ah, we're talking about DIESEL engines, here, not gas. Diesel engines run "lean" because the intake air isn't restricted in any way on most of them. Some even have blowers to compress the intake air! "Lean" means nothing in a diesel. Whatever is there, explodes (at the appropriate time if we inject it appropriately). The bigger the explosion, the more power it makes. They don't "run lean" like a gas engine "runs lean", burning valves, holing pistons, etc. If you take the air cleaner off, you're looking right into the intake valves on my 4-strokers. Those that don't "run lean" are the ones pouring black smoke all over your nice Lexus' white paint....(c; -- Larry |
#33
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"Franz Eckert" wrote in
. dk: But what i don't really understand. How come that many smaller boats (Diesel) have fairly small tank's, and yet the Diesel does not seem to get hotter? Just an observation to all this..... Lionheart's 90 gallon diesel tank is INSIDE the starboard passageway leading aft to the aft cabin (ketch). I've never seen it get any "hotter" from running the Perkins 4-108 than not. Anyone sitting on the starboard seat in the center cockpit is sitting right on top of it. Noone's ass gets burned or even warmed. That would be nice in the winter!...(c; -- Larry |
#34
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Hi Larry.
That's what i mean. I think i will try with a simple test, and make a valve that can steer the fuel two ways. 1. return it to the tank, so i can get the air out. 2. directly back to the feed line after the flow sensor, so that the sensor only senses the REAL flow from the tank to the engine. Then i will let it rock for a while, and keep a close look on every detail, like feeling how hot the fuel lines get, and see if the engines start smoking or in any other way start behaving drunken :-) If it get's hot, it must be possible to simply let the fuel go for a spin in the boat through some copper tube, and let it cool of there before reentering the fuel line. I have ordered the parts, so lets see what i get out of that idear. Anyway, thanx for the link about the engines. That is extremely cheap, and engine like that would costs twice or even three times the amount here in Demark. Franz / Denmark "Larry" skrev i en meddelelse ... "Franz Eckert" wrote in . dk: But what i don't really understand. How come that many smaller boats (Diesel) have fairly small tank's, and yet the Diesel does not seem to get hotter? Just an observation to all this..... Lionheart's 90 gallon diesel tank is INSIDE the starboard passageway leading aft to the aft cabin (ketch). I've never seen it get any "hotter" from running the Perkins 4-108 than not. Anyone sitting on the starboard seat in the center cockpit is sitting right on top of it. Noone's ass gets burned or even warmed. That would be nice in the winter!...(c; -- Larry |
#35
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"Franz Eckert" wrote in
. dk: If it get's hot, it must be possible to simply let the fuel go for a spin in the boat through some copper tube, and let it cool of there before reentering the fuel line. You could simply feed the return oil through a heat exchanger. Any old Mercedes diesel junk car has a great oil heat exchanger beside the radiator that would work great. (I have a '73 220D and '83 300TD. Both have them.) If that works for you, just mount them where the bilge blowers are sucking air through them and you're in business. The oil coolers on the Mercedes diesels have oil pressure on them far exceeding any fuel pressure in the primary loop...(c; -- Larry |
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