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Old 02-07-2015, 13:40   #16
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Re: Larger Heat Exchanger for Perkins 4-108

Thanks for the reply. over 2250, I over-heat. I'd be happy with 2600. Im looking into a new heat exchanger from Transatlantic Diesel. The old one dates to 83 I think.
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Old 02-07-2015, 14:31   #17
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Re: Larger Heat Exchanger for Perkins 4-108

I have my 24,000lb boat propped to run up to 3,00rpm in gear at WOT.
I generally cruise at 25/2600rpm @6.5knts and 175/180 deg. It sounds and runs great at that rpm.
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Old 03-07-2015, 19:40   #18
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Re: Larger Heat Exchanger for Perkins 4-108

Hello All,
Many years ago I bought a boat with a 4-108 in it and experienced the same overheat issues which you are discussing. At the time I was employed by a major marine engine manufacturer (since retired) and I worked with our heat exchanger supplier to build me a one off heat exchanger to solve the problem.

The standard Perkins 12 inch heat exchanger that was mounted behind the engine had only a 9 inch tube bundle inside it, and the one we built used a 12 inch bundle, for an increase in heat rejection capability of 33%. This solved my problem. The new unit bolts in exactly where the old unit sat, on the same bracket, and connects up almost exactly the same. The overall length is 16.5 inches long and all of this extra length extends 4.5 inches toward the starboard side of the engine. This unit worked very well and controlled engine temp regardless of engine load.

I still have this exchanger and would be happy to sell it for a reasonable figure, but more importantly if there is sufficient interest it may be possible to arrange to purchase a number of units from the manufacturer at a wholesale price.

If you are interested, PM me and include your e mail address. I'll send you photos of the old and new HE, the new and old mounted on the engine, etc. We'll see what we can make happen.

DougR
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Old 25-10-2016, 18:17   #19
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Re: Larger Heat Exchanger for Perkins 4-108

I purchased this HE and it really does make a difference! I just motored for 26 hrs at 2600 rpm and the temp never went over 155 deg (25k boat)
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Old 25-10-2016, 19:05   #20
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Re: Larger Heat Exchanger for Perkins 4-108

Quote:
Originally Posted by SkiprJohn View Post
Good luck on your project. Getting those old Perkins to cool down sometimes is a combination of a lot of things. Boiling out the old exchanger, checking exhaust and pump vanes as well as not overpropping. I used to run mine at about 1800 and if I went up to 2200 or higher needed to keep an eye on the heat gauge.
I would cruise at 2100 all day and all night.
2400 max and anything over 2400 would make the temp creep up slowly but surely.
Tried everything but concluded a bigger heat exchanger and or a bigger intake hose/through hull would would solve it.
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Old 25-10-2016, 19:10   #21
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Re: Larger Heat Exchanger for Perkins 4-108

Quote:
I have my 24,000lb boat propped to run up to 3,00rpm in gear at WOT.
I generally cruise at 25/2600rpm @6.5knts and 175/180 deg. It sounds and runs great at that rpm.
At bit overpropped perhaps.?
The 4-108 on my boat was designed to do 4000 RPM at WOT and my prop would let it do just that. The 51 HP rating was also at that RPM if memory serves right.
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Old 25-10-2016, 19:52   #22
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Re: Larger Heat Exchanger for Perkins 4-108

Wainui, maybe I am missing something here, but 155 degrees is way cold for a diesel to run and could cut into its life expectancy. Was that just a typo? ___Grant.
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Old 26-10-2016, 10:36   #23
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Re: Larger Heat Exchanger for Perkins 4-108

I had two great heat exchanger experiences with Lenco. They help me retrofit my Volvo with an oil cooler and heat exchanger. They understood what I wanted and were able to customize one of their "off-shelf" units to meet my needs. Very quick, excellent quality and great price. Highly recommended.

Lenco Coolers - marine heat exchangers, marine oil coolers
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Old 26-10-2016, 19:12   #24
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Re: Larger Heat Exchanger for Perkins 4-108

Installed a new17" HE and ran a 12hr delivery at 2600 rpms and temp never got over 160 deg.
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