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Old 20-12-2017, 08:25   #1
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Diesel engine "compressor", what is it?

I am looking at deciding between a Volvo D4-300 and D6-370 and one difference is apparently that the D4 has "compressor" but the D6 does not.

What is a diesel compressor and the advantages/disadvantages?
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Old 20-12-2017, 08:34   #2
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pirate Re: Diesel engine "compressor", what is it?

As far as I know a compressor is for compressing air.. cant see any purpose for it in a boat unless your setting up a workshop..
Others will be more knowledgeable
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Old 20-12-2017, 08:40   #3
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Re: Diesel engine "compressor", what is it?

Sounds like it's basically a belt-driven supercharger. So that motor has a turbo AND a supercharger... whereas the D6 just has a turbo. My backyard mechanic gut is telling me that possibly makes the D4 a more complicated engine to work on...
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Old 20-12-2017, 08:43   #4
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Re: Diesel engine "compressor", what is it?

Ok according to Google they both have a compressor. Mind you my volvo knows!edge is not the best . That being said the compressor appears to be a belt driven supercharger. Which would in this case improve low rpm performance and virtually eliminate the " turbo lag " effect.
https://www.marinepartseurope.com/en...-25-21923.aspx

Compressor D6-350A-A, D6-350A-B, D6-370A-B, D6-370A-C, D6-370A-D, D6-370D-B, D6-370D-C, D6-370D-D, D6-370A-E, D6-370D-E - 7746210 - volvopentastore.com
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Old 20-12-2017, 09:58   #5
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Re: Diesel engine "compressor", what is it?

Quote:
Originally Posted by jsc7 View Post
I am looking at deciding between a Volvo D4-300 and D6-370 and one difference is apparently that the D4 has "compressor" but the D6 does not.

What is a diesel compressor and the advantages/disadvantages?
They are referring to a supercharger. It's belt driven, so gives a quicker throttle response (at low rpm) than the turbo which is driven by the exhaust gasses and takes a little longer to get to the rpm at which it provides the extra air to increase power. in practice this gets them to jump on the plane quicker.

The D6's I've skippered have both supercharger and turbo. My experience FWIW is that they perform well, and are fuel efficient, but have lots of electronics and when they go wrong it's an expensive nightmare. Repair techs in our part of the world (with perhaps one exception) are really not competent to diagnose faults so just replace expensive parts until they hit on the solution.

I have driven a boat where the supercharger belts had been removed. Throttle response was a little slower but I did not feel it made a huge difference.

Hope that helps
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Old 20-12-2017, 12:32   #6
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Re: Diesel engine "compressor", what is it?

Both engines are rated pleasure or special light duty. 1 hour in 12 at full rpm. Tells a lot about how well they hold up. They have sleeves unlike most recreational engines, so overhaul is easier. But not cheap - they are Volvo.
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Old 20-12-2017, 12:40   #7
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Re: Diesel engine "compressor", what is it?

There is a reason they are called "Green Death" or "Green Grief"
Me, I'd be looking for something simple, no electronics, naturally aspirated, tractor based, cheap easily accessible parts
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Old 21-12-2017, 09:16   #8
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Re: Diesel engine "compressor", what is it?

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There is a reason they are called "Green Death" or "Green Grief"
Me, I'd be looking for something simple, no electronics, naturally aspirated, tractor based, cheap easily accessible parts
Like my Beta 60?
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Old 21-12-2017, 10:35   #9
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Re: Diesel engine "compressor", what is it?

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Like my Beta 60?
Yes, but the op wants 300hp or more.
I have seen the d4 fitted in a boat that worked remote areas.
Within a few years they had replaced them with something more robust and forgiving
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Old 21-12-2017, 10:44   #10
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Re: Diesel engine "compressor", what is it?

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Originally Posted by Simi 60 View Post
Yes, but the op wants 300hp or more.
I have seen the d4 fitted in a boat that worked remote areas.
Within a few years they had replaced them with something more robust and forgiving
something like caterpillar. Either the venerable 3208 or the (IMO) preferable 3116 ( its sleeved so easier to do rebuild when time comes.)
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Old 21-12-2017, 12:27   #11
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Re: Diesel engine "compressor", what is it?

Kompressor is German or European for a turbo-charger.
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Old 21-12-2017, 13:00   #12
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Re: Diesel engine "compressor", what is it?

Volvo engines -
love 'em or hate 'em
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Old 21-12-2017, 15:44   #13
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Re: Diesel engine "compressor", what is it?

Poor translation? Kompressor is German for Turbocharger. Usually gives more power, and better fuel consumption for a given engine model/size. One of the only cases of (well almost) "free lunch".
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Old 21-12-2017, 23:18   #14
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Re: Diesel engine "compressor", what is it?

Quote:
Originally Posted by jmschmidt View Post
Kompressor is German or European for a turbo-charger.
No, its not. They are technically different solutions to blow more air into the engine

[URL="https://en.wikipedia.org/wiki/Kompressor_(Mercedes-Benz)"/URL]

[URL="https://en.wikipedia.org/wiki/Turbocharger"[/URL]
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Old 22-12-2017, 00:09   #15
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Re: Diesel engine "compressor", what is it?

Quote:
Originally Posted by 01kiwijohn View Post
Poor translation? Kompressor is German for Turbocharger. Usually gives more power, and better fuel consumption for a given engine model/size. One of the only cases of (well almost) "free lunch".
Kompressor (stylized as KOMPRESSOR) is a marketing name by Mercedes-Benz used in supercharged engines.

A turbocharger, or colloquially turbo, is a turbine-driven forced induction device that increases an internal combustion engine's efficiency and power output by forcing extra air into the combustion chamber.
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