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Old 02-17-2013, 09:13 PM   #1
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ok, here we go, whats better, a perkins or a lehman and why?

I cant decide please help
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Old 02-17-2013, 09:18 PM   #2
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This should be good discussion!

A Perkins, why because we have one. It has never let us down
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Old 02-17-2013, 09:40 PM   #3
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This should be good discussion!

A Perkins, why because we have one. It has never let us down
well thats a good thing. The reason for my question is i have my heart set on buying a costa mesa or Down East built defever 40 and i have my choice between a bristol 79 twin perkins and a solid single ford lehman. Both Down east vessels

Thanks
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Old 02-17-2013, 09:42 PM   #4
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Cummins :-)
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Old 02-17-2013, 09:52 PM   #5
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This is not a answer to your question. There is no definitive answer to your question.

I sold the Perkins 6.354 185 hp out of my DeFever when I bought it, 8 years ago.

A dredging company bought it for 500 USD. They removed the marine parts, and the turbo, and gave it a radiator. Now they use it to drive a dredging pump on a barge. Saw it last summer, still working. Talked to the barge foreman - it’s going strong he said,

3200 hours, one rebuild when I sold it.

I’m Cummins now.

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Old 02-17-2013, 10:26 PM   #6
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I`ve had both, a single Perkins in the previous boat, twin Lehmans in this one.
Leaving aside the obvious advantage of twins (uh-oh) my spin is the 2 engines are similar in concept, large relatively unstressed enduring engines which have powered a variety of objects. The 185hp output of the turbo & aftercooled Perkins was getting up, but it ran well despite many unrecorded hours from POs, the first being the CYCA, who run the Sydney-Hobart bluewater race and do not spare the horses.
I think the reason you can`t make up your mind is because it is a close thing, both are good and the concepts are similar. You can readily get parts and advice for the Lehman, and parts for the Perkins were available.
I don`t think it matters which you choose, both are good.
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Old 02-17-2013, 10:41 PM   #7
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Agree with Bruce. My trusty old Lehman is still going strong after God knows how many hours, (the hour meter bit broke back on 3,200 hrs 11 yrs ago.)
As Bruce said, both unstressed reliable if somewhat underwhelming performing engines. So basically go for the boat you prefer of the two. If one is a single, and the other a twin, and otherwise comparable, then even tho I've only got a single, I could be persuaded to recommend going for the twin.
This could be fun.....
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Old 02-17-2013, 11:18 PM   #8
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I cant decide please help
As Peter said, go for the boat, not the engine. Or if you prefer, go for the boat with best treated, bet maintained engine(s) of either type.

That said, if we had a choice between a boat we really liked with Lehmans and a boat we really liked with something newer like Luggers, Deeres, Cummins, or Cats we would not get the boat with Lehmans. (We have no experience with Perkins.)

I'm not a fan of Lehmans although they can be very reliable, long-lived engines. I just don't care for old, outdated, inefficient, heavy, noisy engines.
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Old 02-17-2013, 11:36 PM   #9
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They are both good motors is taken care of.


There... Thread over.
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Old 02-17-2013, 11:43 PM   #10
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I think not Gonzo.

Nobody has even identified a difference between the two engines yet.
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Old 02-18-2013, 12:46 AM   #11
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They are both good motors is taken care of.

There... Thread over.

SILENCE!!!!!!!!!! The Moderator has spoken!
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Old 02-18-2013, 12:46 AM   #12
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I think not Gonzo.

Nobody has even identified a difference between the two engines yet.
I'll go down in the engine room and do just that. We have both. Lehmans drive the boat and a Perkins drives the Westerbeke. Another Perkins drove the Kohler but we sold that genny as two seemed a bit of overkill. The Perkins is a bit more cramped in layout but much of that is not apples vs apples as two are 120hp and the other 27hp I think.
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Old 02-18-2013, 02:03 AM   #13
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Cummins :-)
What Fryedaze said.
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Old 02-18-2013, 05:27 AM   #14
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Greetings,
Have and have always had Lehman. Better red than dead. SOME Perkins parts can be expensive or difficult to obtain (think exhaust manifolds). Lehman had 6 letters. 3 Lehmans=666...'nuff said. Perkins has 7 letters. Three 7's=a win in Vegas...Hmmm...Should the new toaster for the galley be painted or chromed?????
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Old 02-18-2013, 05:56 AM   #15
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Compare and contrast the state of the other systems, particularly electrical, on the two boats. What R&M $$ will need to be spent in the next few years? If you still cant split them, it will come down to you preference for single or twin.

But of course if you wanted a really good old engine you would install a Gardner, or two if you are a lottery winner.
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Old 02-18-2013, 06:06 AM   #16
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For putting the ICW or other lakes bays and rivers , what difference does it make?

For offshore , passage making , out of the range of Sea Tow and cell phones , a genuine industrial style engine would be a superior choice.

I prefer DD as they if required will operate at FULL RATED LOAD for as long as required.

The key it to look on the mfg or converters web site and see if 4 duty ratings are given.

This seperates the yard equipment or auto takeouts from the genuine HD engines.

Sadly the supply of sources for about 100HP Rated to operate at 70-80 HP is limited.

I would look to the generator mfg to see what they use in the 100 hp area.

For my own boat offshore a DD Ser 60 would be 1st choice (with a locker of control Dedec boxes) or 6-71 N or an International DT 360 or 466 for a really robust (and CHEAP) engine to marinize.

On a used boat you simply get what ever engine was cheapest to the boat assembler , that's why you see boats with Volvos.
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Old 02-18-2013, 06:36 AM   #17
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Kinda like deciding who's grandma you're going to take to the prom..
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Old 02-18-2013, 07:48 AM   #18
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Greetings,
SOME Perkins parts can be expensive or difficult to obtain (think exhaust manifolds)...Hmmm...Should the new toaster for the galley be painted or chromed?????
Here are a couple of thoughts where Perkins are concerned:

1. If the Perkins are 6.354's with turbos....the exhaust manifolds are readily available. If they are naturals...they are available...built on demand of stainless steel...and oddly enough cost less than Perkins did before discontinued.

I am a Perkins owner...I love my engines. My previous boat was Perkins powered.... They are great engines. Mine are naturals...and they run well and I have maintained them well. They are fuel efficient.

2. Here is the rub.... If the boat has a "counter rotating" Perkins 6.354, then you have to hope that the fresh water pump on that engine is in good shape.... If the pump fails...it can only be rebuilt...it appears that none can be purchase new through Perkins....and are not being made after market. So....if the pump fails and is not rebuildable...an alternate method of pumping the water will be have to created.

But, even still...I would not use that fact as a determinant.... Because if the water pump is fine...then it can continue working for years...and as mentioned...it can be rebuilt...

The toaster? Chrome naturally!
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Old 02-18-2013, 08:26 AM   #19
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Kinda like deciding who's grandma you're going to take to the prom..
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Old 02-18-2013, 08:27 AM   #20
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Here are a couple of thoughts where Perkins are concerned:

1. If the Perkins are 6.354's with turbos....the exhaust manifolds are readily available. If they are naturals...they are available...built on demand of stainless steel...and oddly enough cost less than Perkins did before discontinued.

I am a Perkins owner...I love my engines. My previous boat was Perkins powered.... They are great engines. Mine are naturals...and they run well and I have maintained them well. They are fuel efficient.

2. Here is the rub.... If the boat has a "counter rotating" Perkins 6.354, then you have to hope that the fresh water pump on that engine is in good shape.... If the pump fails...it can only be rebuilt...it appears that none can be purchase new through Perkins....and are not being made after market. So....if the pump fails and is not rebuildable...an alternate method of pumping the water will be have to created.

But, even still...I would not use that fact as a determinant.... Because if the water pump is fine...then it can continue working for years...and as mentioned...it can be rebuilt...

The toaster? Chrome naturally!
Lol I was about to mention the contra-rotating pump or there lack of lol

I've just rebuilt my 1991 Perkins 6.354.4
Cost for the full rebuild kit including new water pump, two new fuel filter assembly pumps was about $600.00. The new injectors, new CAV injector pump and rebuilt oil coolers cost $1800.00. Just gotta buy new hoses and paint then I can start her up. That'll probs be around $200.00 so $2,600.00 all up for a relatively brand new motor. Not cheap but not the dearest I've seen either. From what I've found parts are easy to get and reliability should see the motor out last me with proper maintenance and care.

Hope that's some help for ya mate.

My $0.02
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