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Old 11-24-2019, 03:17 PM   #41
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Here is another engine I have come across; British Leyland 165HP, not a turbo. Anybody out there with a pair of those? I wonder how easy it is to get parts?
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Old 11-24-2019, 05:09 PM   #42
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I looked at a 36 with a Leyland. I couldn’t find a source for parts. Too bad as it was a nice boat.
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Old 11-24-2019, 06:52 PM   #43
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I dont have the spec sheets with me (boats is in storage in Wisconsin) but if I recall, the displacement is 6.6L and 305 HP. If needed, I can pdf you the spec sheets (including fuel burn chart) when Im visiting the boat next week. Just let me know....
Thanks much dz.
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Old 11-24-2019, 07:32 PM   #44
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Here is another engine I have come across; British Leyland 165HP, not a turbo. Anybody out there with a pair of those? I wonder how easy it is to get parts?
I had a GB with a British Leyland. It was a 200 hp turbo. Same engine as the 165 but with an intercooler. Removed the intercooler so I had a 165. Engine was bulletproof. Not a single hiccup in 15 years of ownership. American Diesel has the parts. Talk to Brian Smith at American Diesel for any info you could possibly want.
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Old 12-15-2019, 01:11 AM   #45
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Like dz1, I have a GB 42 Classic (1994) with 3116 Cats. They are rated around 300 hp in this configuration (a small turbo). When looking to buy a boat (I was only interested in GB 42's), I saw boats with up to 475hp twins - which I thought was ridiculous - 300 hp engines were the most I wanted in a trawler that I intended to cruise at about hull speed. If I wanted to cruise at 20 kts or more, I would have bought a Sea Ray and I would't be on Trawler Forum.

We cruise at about 1600 - 1700 rpm and even there, I worry about underloading the engines. I bring them up to 2000 occasionally to "burn the carbon out." Can't imagine what damage would be done to 450-475 engines if you ran at hull speed most of the time. Contrarily, I'm not interested in the 20 - 40 gph fuel burn you'd need to run those big engines at a proper speed.

I think I've hit a sweet spot on my boat. We burn about 4-5 gph overall (including gen and the two engines) and everything seems to run happily. I'm happy to have the capability to run at 13 kts if I have too (due to weather or other trouble) but glad I don't have to do that all the time in order to keep the engines healthy.

Very glad to have the inline 6's instead of v-8's for accessibility in the engine room.
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Old 12-15-2019, 04:15 AM   #46
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GB is a semi-displacement hull and will plane with enough horsepower. The theoretical top-speed is infinite.

The difference is fuel burn. If it took 45 litres to get somewhere in 3 hours or 45 litres to get to the same place in one hour (sadly, its not linear) its the same thing...

The best GB42 I have seen had a single 6 cal Gardner that idled at 400 rpm and came with a drum of Brasso.
I'm late to the discussion here, but if memory serves and the 42 Xsbank saw with a Gardner was a motoryacht, then i believe it was a boat that Tony Fleming built for himself while he was with American Marine.
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Old 12-24-2019, 02:21 AM   #47
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I guess the point of my post was that the Gardner at 120 hp is adequate for the 42 GB. A single Lehman 120 was an option back in the 70s for the 42
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Old 12-24-2019, 08:24 AM   #48
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I guess the point of my post was that the Gardner at 120 hp is adequate for the 42 GB. A single Lehman 120 was an option back in the 70s for the 42
single Lehman 120 would be a nice package in the GB,lots of room to work around it and efficient.
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Old 09-23-2021, 06:13 PM   #49
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Specifically what power plant choice would be found in a 1980-90 Classic 49'?
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Old 09-23-2021, 10:56 PM   #50
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Specifically what power plant choice would be found in a 1980-90 Classic 49'?

Most likely twin Ford Lehman 120's. If repowered, then likely Ford Lehman 135's or Cummins 6BTA's or maybe a John Deere
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Old 09-24-2021, 07:34 AM   #51
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Most likely twin Ford Lehman 120's. If repowered, then likely Ford Lehman 135's or Cummins 6BTA's or maybe a John Deere

Towards the 1990 end of the range they might also have Cat 3208s. The one GB49 MY locally is an early 90s build with twin 3208TAs.
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Old 09-24-2021, 07:57 AM   #52
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I believe they came with whatever the original owner / dealer specified. However most if not all that I have seen of that vintage and size were 3208 TA’s.
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