The Boating Forum - Rebuild of a QSB 5.9L 600 Hp.

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View Full Version : Rebuild of a QSB 5.9L 600 Hp.


Greg Dpm
05-01-2010, 08:38 AM
The THT guys have been great, I think we have a one off marine Diesel Shop like no other,so I thought I would open up the shop to you guys....We are building 5 or 6 QSB's 500 thru 600 Hp......One engine is going in our test boat, more on that later.....This is our day job, and the Topaz gets 1~2 hours a day, the progress should p/u soon..We compare turbo's, cooling spray systems,piston and rod designs using 12 different Cat/Cummins engines....So here what we have so far, a QSB 5.9, Balanced and blue printed, Injection pump flow up over 40%, enlarged injectors,HX-50 waste gate turbo,new cam, new rods,6" dia. Hx, custom aftercooler, and an extra external oil cooler.(Porsche style).and a larger Raw water pump ~ 125 Gpm, wiring harness from an Industrial QSB, and a re flashed 480 ECM.....I think thats it.....Oh and it turns 3650 Rpm..We keep around 24 engines in the shop, and another 16 being disam., being reworked at the machine shop,and dyno shop...We will be happy to answer any questions....and your going to have to over look my stalker, sorry he won't go away. :joincc:


Greg Dpm
05-01-2010, 08:41 AM
:thumbsup: more pictures.....Thanks for the support, Greg Slayton

doughnut
05-01-2010, 08:58 AM
I need one of those for my Pickup!


MacCTD
05-01-2010, 12:28 PM
5.9L with 600hp, that's impressive but what is the life expectancy?

Greg Dpm
05-01-2010, 02:43 PM
Close to that of a 350 Verado.....At 75% power and less, 2600 rpm and down good life...WOT maybe 500 hrs.....Thanks Greg

chrisrack
05-01-2010, 08:01 PM
Are you guys that much better diesel and mechanical engineers compared to the guys at Cummins that allows you to obtain higher hp outputs than what is obtained at the factory?

If you can do it, why don't the factory engineers at Cummins do the same thing?

seabob4
05-01-2010, 08:09 PM
Guess I'm missing the point here...I want 5K hours between MOH, I want power, and I want small footprint...

What's your torque curve at low RPM versus Yanmars?;cool;

BTW, NICE shop...

shoal cat
05-01-2010, 08:15 PM
Are you guys that much better diesel and mechanical engineers compared to the guys at Cummins that allows you to obtain higher hp outputs than what is obtained at the factory?

If you can do it, why don't the factory engineers at Cummins do the same thing?

They could do it, but my guess is because the emissions are so tight they cant do it. Theres alot you can do to these engines but the factory goes for the best all around consumer friendly and emission friendly compromise. Diesel engines are now to meet stringent boundaries. Its crazy what they want these engines to do with the emission crap they put on them. They are way detuned from the factory, look at the automotive industry, although now they have the 6.7l (because of emissions) the 5.9 was around for 20 something years, and the guys can put a programmer on the common rails and in 3 minutes gain anywhere from 80-180 horses. And if you make more modifications you can get a whole lot more and they last a long time like a toosty pop. These motors are built strong and are proven. Sorry im a cummins freak and have tweaked a few.

oarwhat
05-02-2010, 05:01 AM
Guy's I don't want to pollute this thread but, anyone wanting to purchase anything from Greg should know a few things. In this thread on boatdiesel http://boatdiesel.com/Forums/index.c...hread_ID=40004 (http://boatdiesel.com/Forums/index.cfm?CFApp=0&Thread_ID=40004) Greg was thrown of the forum by the OWNER of boatdiesel! The owner received numerous emails about problems with Greg's work and recommends not to deal with him. I see a post was deleted on a THT complaining about Greg (his so called "stalker") ,they did the same thing on boatdiesel until they realized the complaints were justified. I won't go into anymore details just BUYER BEWARE!!!!

Morse
05-02-2010, 05:32 AM
Just a suggestion, but visit competitiondiesel.com and make your turbo choice from there. A dependable 600 cummins motor was very common years ago on daily driver trucks that live forever. Mods for 600 on a cummins is very minor. I've been racing them since 99, and have toyed with many combinations. A basic 62/65/14 as a single turbo will make a cool 600 hp, and is capable of low 700's easily. The absolute best combination as far as a mild build for low egt's, throttle response, and longevity I've found is a 57(s300) over a small 74 (S400). That small set of compounds would make 600 hp very easily. It could also be used to make up to 750+ hp easily. They are just an awesome combination. I'm not familiar with marine engines, but I know the cummins 5.9 fairly well. There are many better choices in turbos for that motor than an HX50. You may know something I don't, so please share your info.

modunlavy
05-02-2010, 06:17 AM
what is the warranty on these engines?

The EPA emmission requirements have actually caused hp to INCREASE in the same powerplant, NOT decrease. Less waste means more fuel converted to HP. Cummins is the perfect example, their hp increased acrossed the line on the same engine configurations when they changed to common rail.

The configurations sold by Cummins (and others) are what are designed to provide the desired engine life for the application. Most recreational marine diesels have a service life of 4,000 to 6,000 hours. The life of a diesel engine is based heavily on the amount of fuel burned through it, so increasing the fuel rate (hp) shortens the life - no question.

shoal cat
05-02-2010, 06:36 AM
what is the warranty on these engines?

The EPA emmission requirements have actually caused hp to INCREASE in the same powerplant, NOT decrease. Less waste means more fuel converted to HP. Cummins is the perfect example, their hp increased acrossed the line on the same engine configurations when they changed to common rail.

The configurations sold by Cummins (and others) are what are designed to provide the desired engine life for the application. Most recreational marine diesels have a service life of 4,000 to 6,000 hours. The life of a diesel engine is based heavily on the amount of fuel burned through it, so increasing the fuel rate (hp) shortens the life - no question.

Well yeah sure, if your increasing the amount of fuel without any additional air or messing with the timing to efficiently burn all the fuel then you will decrease the life of your motor. And take a look at the new ram cummins, you tell me that emissions have increased hp? Is that why cummins had to go to a 6.7 l versus the 5.9 l they had for years because they wanted to. I doubt it, that motor doesnt make much more hp and is by far less fuel efficient. When they added the egr valve, diesel particulate filter (that raw fuel is dumped into and then heated up and burned off while going down the road) thats real efficient, no waste there. I guess all around emissions have helped, but i have seen first hand that by removing some of those things you gain hp and fuel economy. One of the best things you can do to a diesel is get an egt gauge and monitor it.

Greg Dpm
05-02-2010, 06:39 AM
Guy's I don't want to pollute this thread but, anyone wanting to purchase anything from Greg should know a few things. In this thread on boatdiesel http://boatdiesel.com/Forums/index.c...hread_ID=40004 (http://boatdiesel.com/Forums/index.cfm?CFApp=0&Thread_ID=40004) Greg was thrown of the forum by the OWNER of boatdiesel! The owner received numerous emails about problems with Greg's work and recommends not to deal with him. I see a post was deleted on a THT complaining about Greg (his so called "stalker") ,they did the same thing on boatdiesel until they realized the complaints were justified. I won't go into anymore details just BUYER BEWARE!!!!

....:banghead: Qarwhat, I noticed you did not sign your name ?......Here is the deal, B/D is geared toward guys who maintain there 6 Bta's....We are not that type company..2nd I have been ask to lay low on B/D, I email Peter, and Tony Athens is a friend of mine weekly to resolve our problems.....2 problems last year a Dentist who did not pay is bill, and got the wrong injection pump from us.....There we have offer to split the difference and settle, The 2nd guy bought 2 used engines and I ask him to buy rebuilds, but he insisted that a Cummins factory engine would last forever...Who in there right mine buy an engine being pull out of a 10 yr old boat ?....So he is pissed because one engine needs to be rebuilt....For the record we have twice given this guy funds/parts to ease his pain.......Now Oarwhat you have bashed me several times is that enough for you ?.......Please visit my shop before you make such a bold statement, I am not in your laundry either ....Greg Slayton

Greg Dpm
05-02-2010, 06:57 AM
Back to the thread. Morse is correct, we should and do use a water cooled turbo, for the C.Guard reg.'s....The QSC has 3 sizes, I picked the large one because these first engines are going in a very light go-fast boat....But we may change back to a smaller turbo in other applications.
Mondunlavy: good points that you make ....6 month warranty on engines
Seabob4, and Shoalcat All you guys make very good points.....Thank-you for the support..Greg Slayton

nabeelah
05-02-2010, 11:34 AM
Greg,there are almost always two sides of the story and every in this world will not like you either...its good to see that you have told us you side of the story and clear the air.
Keep up your good work and reputation that your father built when he started things off for you....we all love your innovations and dedication to be different.A person will never be everyones favourite all the time!!
Regards from Fiji!!

Greg Dpm
05-02-2010, 11:58 AM
Thank-you....I am the third generation machinist/ Mechanical Engineer ...I would like to think I have made both my grandfather's proud, they passed years ago...We do care about every customer. Thanks Greg Slayton

Morse
05-02-2010, 01:55 PM
I just wanted to mention that my post wasn't intended to be negative in any way. I respect the effort you're putting into your diesel combinations. I'm a nut over anything diesel.

doughnut
05-02-2010, 03:35 PM
Well yeah sure, if your increasing the amount of fuel without any additional air or messing with the timing to efficiently burn all the fuel then you will decrease the life of your motor. And take a look at the new ram cummins, you tell me that emissions have increased hp? Is that why cummins had to go to a 6.7 l versus the 5.9 l they had for years because they wanted to. I doubt it, that motor doesnt make much more hp and is by far less fuel efficient. When they added the egr valve, diesel particulate filter (that raw fuel is dumped into and then heated up and burned off while going down the road) thats real efficient, no waste there. I guess all around emissions have helped, but i have seen first hand that by removing some of those things you gain hp and fuel economy. One of the best things you can do to a diesel is get an egt gauge and monitor it.


Well Well Well, why did Dodge go to the 6.7? Because it was developed in the same engine program as the 5.9 was with FIAT and VM Auto Motori all those years ago. Fiat sells the 6.7 as a Mariniazation already, and has for a long time.

Fiat! hahahahah

doughnut
05-02-2010, 03:37 PM
Guy's I don't want to pollute this thread but, anyone wanting to purchase anything from Greg should know a few things. In this thread on boatdiesel http://boatdiesel.com/Forums/index.c...hread_ID=40004 (http://boatdiesel.com/Forums/index.cfm?CFApp=0&Thread_ID=40004) Greg was thrown of the forum by the OWNER of boatdiesel! The owner received numerous emails about problems with Greg's work and recommends not to deal with him. I see a post was deleted on a THT complaining about Greg (his so called "stalker") ,they did the same thing on boatdiesel until they realized the complaints were justified. I won't go into anymore details just BUYER BEWARE!!!!

You wont go into more detail? You; just toss the slander out there and bail? Another Toddler I see.

Greg Dpm
05-06-2010, 02:33 PM
:thumbsup: We are finishing one engine up now, here are a couple of pictures ...Thanks Greg



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