|
|
20-12-2017, 08:25
|
#1
|
Registered User
Join Date: Apr 2017
Location: Boston
Boat: Boston Whaler, Conquest 315, 31ft
Posts: 212
|
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?
|
|
|
20-12-2017, 08:34
|
#2
|
Senior Cruiser
Join Date: Jan 2010
Location: PORTUGAL
Posts: 30,585
|
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
__________________
It was a dark and stormy night and the captain of the ship said.. "Hey Jim, spin us a yarn." and the yarn began like this.. "It was a dark and stormy night.."
|
|
|
20-12-2017, 08:40
|
#3
|
Registered User
Join Date: Aug 2016
Posts: 987
|
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...
|
|
|
20-12-2017, 08:43
|
#4
|
Senior Cruiser
Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,121
|
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
__________________
Non illigitamus carborundum
|
|
|
20-12-2017, 09:58
|
#5
|
Registered User
Join Date: Nov 2011
Posts: 33
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by jsc7
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
|
|
|
20-12-2017, 12:32
|
#6
|
Senior Cruiser
Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 3,499
|
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.
|
|
|
20-12-2017, 12:40
|
#7
|
Registered User
Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
|
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
|
|
|
21-12-2017, 09:16
|
#8
|
Registered User
Join Date: May 2008
Location: Nova Scotia until Spring 2021
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,976
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by Simi 60
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?
|
|
|
21-12-2017, 10:35
|
#9
|
Registered User
Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by S/V Alchemy
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
|
|
|
21-12-2017, 10:44
|
#10
|
Senior Cruiser
Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,121
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by Simi 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
|
something like caterpillar. Either the venerable 3208 or the (IMO) preferable 3116 ( its sleeved so easier to do rebuild when time comes.)
__________________
Non illigitamus carborundum
|
|
|
21-12-2017, 12:27
|
#11
|
Marine Service Provider
Join Date: Dec 2011
Posts: 1,538
|
Re: Diesel engine "compressor", what is it?
Kompressor is German or European for a turbo-charger.
|
|
|
21-12-2017, 13:00
|
#12
|
Registered User
Join Date: Apr 2015
Location: Home port: Ft Lauderdale, Florida
Boat: VIA 42, aluminium cutter
Posts: 141
|
Re: Diesel engine "compressor", what is it?
Volvo engines -
love 'em or hate 'em
|
|
|
21-12-2017, 15:44
|
#13
|
Registered User
Join Date: Mar 2014
Location: Tacoma, Washington, USA
Boat: Casacde 36
Posts: 596
|
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".
|
|
|
21-12-2017, 23:18
|
#14
|
Registered User
Join Date: Dec 2013
Location: Malta
Boat: Nicholson 26
Posts: 112
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by jmschmidt
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]
|
|
|
22-12-2017, 00:09
|
#15
|
Senior Cruiser
Join Date: Sep 2014
Location: puget sound washington
Boat: 1968 Islander bahama 24 hull 182, 1963 columbia 29 defender. hull # 60
Posts: 12,121
|
Re: Diesel engine "compressor", what is it?
Quote:
Originally Posted by 01kiwijohn
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.
__________________
Non illigitamus carborundum
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|