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Looking for information/opinions regarding 3160 Cat diesels, 8000 hours on the ones we may look at. Cat diesels have a good reputation. Should one expect 10,000 to 15,000 hours bfore rebuild if looked after. 800 houor routine would probably be a top end overhaul.
During survey have a leak down test and compression test done. Repowering - replace with lower power diesels with newer technology or rebuild, the 210 HP out of these Cats apparently can take the boat to 15 knots, hardly up on plane but drinking a lot of gas. Taking a boat this size past 8-9 knots is not fuel efficient in any way. TIA Ernest Nash To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited. Arild Jensen 21/5/2007, 11:17 น.
-Original Message- From: Ernest Nash Looking for information/opinions regarding 3160 Cat dieselsRepowering - replace with lower power diesels with newer technology or rebuild, the 210 HP out of these Cats apparently can take the boat to 15 knots, hardly up on plane but drinking a lot of gas. Taking a boat this size past 8-9 knots is not fuel efficient in any way. Ernest Nash REPLY In light of current and forseeable fuel pricing, the topic of how much power is really needed to move a given boat hull is going to get a lot more attention. Does it make any sense to have twice as much horse power installed than what is required to drive the hull at an economical hull speed? I'm not talking about having some reserve to deal with contrary head winds and maybe a bit of opposing water current. I'm talking about the habit by marketing people to use numbers and the bigger the better.
A trend which often leads to ridiculous horse power ratings far beyond what can reasonably be used on that boat. Naval architects have reliable formulas backed up with tank testing that show exactly how much power is required to move a given hull at a specified speed. In the case of a true full displacement hull, we know exactly how fast that hull can move at maximum speed.
A number of listees have mentioned they seldom if ever run at maximum throttle because of the excessive fuel burn that produces. Evidently these boats were built with oversized engines. Engines that can be delivered in varying HP sizes have much longer life expectancy in the lower power range than when maximum power is extracted. Seems to me the whole boating industry is due for a reality check when it comes to determining engine horse power for a given hull size. Trawlers in particular do not benefit from over powering the boat.
They simply dig bigger holes in the water and tend to empty the owner's wallet faster. What say the list members? Arild To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited. Pascal Gademer 21/5/2007, 11:55 น.
While my boat isn't a trawler, it will not get on plane with its 325hp 8V71Ns. Top speed is 14kts, 15kts maybe on a good day burning. I don't even know! I always run around 9kts in deep water.
(more like 8 to 8.5 in shallow biscayne bay) at about 1450 rpm, whihc is fast enough to keep temperatures where they need to be. If i ever repower, I'll look into smaller engines.no point in keeping 7000lbs of iron on board.
Pascal miami, fl 70 hatteras 53my live helmcam - Original Message - From: 'Arild Jensen' A number of listees have mentioned they seldom if ever run at maximum throttle because of the excessive fuel burn that produces. Evidently these boats were built with oversized engines.
Engines that can be delivered in varying HP sizes have much longer life expectancy in the lower power range than when maximum power is extracted. Seems to me the whole boating industry is due for a reality check when it comes to determining engine horse power for a given hull size. Trawlers in particular do not benefit from over powering the boat. They simply dig bigger holes in the water and tend to empty the owner's wallet faster.
What say the list members? Arild To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message.
Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited. Red.@travel-net.com 21/5/2007, 12:05 น. Arild Wholeheartedly agree with your premise. I would estimate that it takes no more than 100 HP to move this boat through the water at 8 knots, a 48 Ft Gulf Commander. I would further submit that a single 120 HP diesel engine would be more than sufficient. A more contrary position would be concern about tides, narrows and such on the west coast; however, there are owners out there with low powered boats taking these issues in stride and travelling accordingly.
I would also say that a 20 ton boat with twin 3160 cats @ 210 HP does dig a fair hole when using full power, but being a semi-displacement hull the hole is not as big. However, in support of the overpowering industry that appears to be prevalent, gas was much cheaper back in the late sixties, early seventees.
Another issue, slightly off topic is finding an older boat, say '70s vintage with a sizeable BW tank (grey water soon to be uppon us). Saying all this, is it better to repower with less horsepower, considering the possibility of changing transmissions and other anciliaries, or just rebuilding the same and cruising accordingly? Ernest On Mon, 21 May 2007 11:17:18 -0700, 'Arild Jensen' wrote: A number of listees have mentioned they seldom if ever run at maximum throttle because of the excessive fuel burn that produces.
Evidently these boats were built with oversized engines. Engines that can be delivered in varying HP sizes have much longer life expectancy in the lower power range than when maximum power is extracted. Seems to me the whole boating industry is due for a reality check when it comes to determining engine horse power for a given hull size. Trawlers in particular do not benefit from over powering the boat. They simply dig bigger holes in the water and tend to empty the owner's wallet faster. What say the list members? Arild To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message.
Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited. Red.@travel-net.com 21/5/2007, 12:07 น. Pascal Have always enjoyed reading your posts.
One check mark for repowering with smaller, lighter engines, most likely way more fuel efficient as well. Ernest On Mon, 21 May 2007 14:55:37 -0400, 'Pascal Gademer' wrote: while my boat isn't a trawler, it will not get on plane with its 325hp 8V71Ns. Top speed is 14kts, 15kts maybe on a good day burning.
I don't even know! i always run around 9kts in deep water. (more like 8 to 8.5 in shallow biscayne bay) at about 1450 rpm, whihc is fast enough to keep temperatures where they need to be. If i ever repower, I'll look into smaller engines.no point in keeping 7000lbs of iron on board. pascal miami, fl 70 hatteras 53my live helmcam - Original Message - From: 'Arild Jensen' Ron Rogers 21/5/2007, 12:27 น. I agree with Arild, as usual.
I missed the original email, but I'm going to assume that the hull is like that of a Grand Banks 'trawler' and is a 'semi-planning' hull. GBs come with ridiculous (to me) horsepower options. In the old days, fuel was cheaper and those who bought these boats were not fuel price sensitive. Many remain that way and like the option of going fast - inefficient or not. Just look at the wakes they leave.
However, I now see this type of boat offered with smaller engines. Buying low rev engines of lesser power enhances fuel economy and resale value - IMHO. GPH is a function of hull, propeller, and engine efficiency. Therefore, the first thing I would do is determine the largest propeller that can properly fit in the given space and then work out the proper HP and reduction gear. OR, as a cost savings measure determine which smaller engines are compatible with your existing transmissions. Ron Rogers To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions.
Unauthorized use is prohibited. Arild Jensen 21/5/2007, 17:14 น. -Original Message- From: Ernest Saying all this, is it better to repower with less horsepowerconsidering the possibility of changing transmissions and other anciliaries, or just rebuilding the same and cruising accordingly? REPLY If the existing transmission cannot bolt up to a smaller engine, there will probably still be a resale value to offset getting a gearbox to match. As another poster said, such a repower will definitely enhance resale value. Selecting an engine that can drive the hull at full displacement speed with a 20% reserve should be less expensive. Concerning other anciliaries; they would be larger than required but this should not be a detriment.
Cheers Arild To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited.
Graham Pugh 22/5/2007, 5:08 น. I missed the original post. Having owned a Mainship 390 with a Yanmar 300 hp turbo charged engine, I couldn't agree more with Arild's opinion.
The only time I ever had the engine up to WAT was when I bought and sold the trawler during sea trials. This semi displacement hull would have been perfectly happy with a very much smaller engine probably half the size, but many of this popular model were sold with very much larger engines than mine. I've just returned from a trip to UK where I had rented a Peugeot 307 1.4 litre.
Cat 3160 Marine Engine Review
This comfortable mid sized car by British standards had plenty of power and averaged 6.5/ litres per 100 km or about 36 miles per US gal. None of our three US made cars average anything like that fuel consumption:-) Graham Pugh Kando 11 Kingston, ON To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions. Unauthorized use is prohibited. Pascal Gademer 22/5/2007, 7:52 น. At the risk of taking this thread way out there:-) while not everyone wants a tiny car with a 1.4 litre engine, US manufacturers in europe already sell decently sized cars and SUVs with fuel economy 30 to 40% higher than those they sell to US consumers. So it's kind of funny when we hear all this talk about ethanol is going to save us and how mileage must go up by 10% 5 or 8 years from now when we coudl do much better, almost immediately, without sacrificing size, safety and comfort if emmission standards where relaxed jsut a little.
Check out the european Chevy or Ford web sites. 30 to 40% better mileage than equivalent US models. Pascal miami, fl - Original Message - From: 'Graham Pugh' I've just returned from a trip to UK where I had rented a Peugeot 307 1.4 litre. This comfortable mid sized car by British standards had plenty of power and averaged 6.5/ litres per 100 km or about 36 miles per US gal. None of our three US made cars average anything like that fuel consumption :-) To unsubscribe send email to with the word UNSUBSCRIBE and nothing else in the subject or body of the message. Trawlers & Trawlering and T&T are trademarks of Water World Productions.
Unauthorized use is prohibited. Alec McLocklin (amclockl) 22/5/2007, 9:20 น.