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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 06-27-2010
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perkins 4-236u gph?

Hi all;

We looked at a boat the other day with a perkins 4-236u engine. Anyone that can hazard a guess as to the fuel usage at cruising speed, and at 1200 rpm? She has a big sea frost engine driven system for refer and freezer.

Hull is 33lwl, displaces 25000#, with a 3 blade prop and long overhangs. Quite a difference from our present boat!

The owner has passed, so I cannot ask him.

Thanks, chris
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Old 06-27-2010
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We avg about 1.25 gal/hr overall. Avg cruising speed is 1400 RPM
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Old 06-29-2010
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I assume you have the same engine? What else can you tell me about it - maintenance, problems, quirks?

Chris
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Old 06-29-2010
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What's the hp? A diesel fuel consumption will average about .35 to .4 lbs/hp-hr. Remember the power drops off dramatically as your reduce speed (about as the cube). I would guess at cruise you are only at about 1/2 rated power. Diesel fuel density is about 7 lbs per gallon. So take 1/2 the rated power, multiply by .35 or .4, and divide by 7.
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Perkins diesel fuel milage per hour etc.

I've a Perkins 4-108, a little smaller than the Perkins 4-236 and it burns about 1/2 gallon per hour @ 1900RPM, 3/4 gallon per hour @ 2100RPM, and 1 Gallon per hour @ 2500RPM.

The boat is an Irwin, 37ft LOA with a 31ft LWL, and 20,000 lbs.

The boat is in charter service and with all the charterers using the boat these are the averages so the Perkins 4-236 might burn a little more.

I've worked on the Perkins 4-236 and it's a good reliable engine.

Fair Winds........................
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Quote:
Originally Posted by svsirius View Post
We avg about 1.25 gal/hr overall. Avg cruising speed is 1400 RPM
To clarify - Yes it is a 4.236 circa 1985 with about 2500 hrs. 82 or 85 HP
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I really don't know anything about Perkins engines - how are they to maintain? Are parts expensive (like my Volvo??) Things to watch out for? # of hours between rebuilds on a well maintained unit?

Chris
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Perkins Engines

Perkins have been sold everywhere in the world and parts should be available anywhere you cruise. I was cruising in La Paz Mexico and needed a part for my Perkins 6-354 and was supprised to find that the parts were not only available but a lot cheaper than in the states. The local dealer told me that Perkins was the only engine used on agricultural farm products in Mexico. These engines should get at least 5000 hours before any kind of major trouble. Keep in mind that anything that hangs on the engine is subject to relacement from time to time, like the alternator, sea water pump, etc. The avarage time put on a Diesel is about 250 to 300 hours a year in the average sailboat, so do the math and you'll see that it will last for a long time.

Fair winds and following seas,

Jim
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