Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

I am repowering a seacraft 25 Seafari. I was wondering if anyone had a recommendation between these two engines. We would be going with a volvo duoprop sterndrive for the D4 and a Bravo 3 for the Cummins.

Thanks, Gary

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

All I know is the duoprops do get good fuel milege and are pretty bullit proof, But the Merc's have relly good paint.

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

gj are you from Hawaii? I'm on Oahu. Take it easy, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

How's relative service on them in your area...??
Cummins makes good engines....

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Hey bayouboy,

Haven't had any experience with Cummins yet. The new boat will be a Cummins and is still being built. The old one in the Hawaiian Seacraft thread had a Volvo 200 diesel in it. Volvo service wasn't a problem for us as we could do most of the work ourselves. If we couldn't my brother had a friend who is a Volvo Penta mechanic :D I have heard many good things from friends about Cummins diesels. Aloha, Greg

BTW how's you hand?

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

YF...Hand is on the mend...thanks. I've started back to working on the Tsunami.... :cool:

I have some buddies that work at Cummins Mercruiser Diesel....while I'm no expert I do see their engines quite a bit. One has a 20' Bertram Moppie he put a 200HP w/ Bravo I in....another is redoing a 28 Donzi with twin 360HP. I've even got to see the new Zeus drives in action. They're good rep is well deserved.

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Yeah, I am from Hawaii, I grew up in Kailua, Oahu but I live in town now. I still fish the windward side for the most part, but I ended up in Waianae a lot this year. On another subject, do you know the history behind the yellowfin hull. I have heard that it is a modified seacraft 23. They definately flattened the deadrise in the aft section of the hull, and I have also heard that they widened it a bit. If you have any other info I would be interested to know. P.S. The Ahis are still here, my friend got 3 last weekend.

Gary

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

So when are we having a Hawaii SeaCraft gathering? :cool:

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

bayouboy,

Do you have a friend at CMD who is a mechanic? I would like to get true information re: the weak points or trouble areas of some of their products. Glad your hand is doing well. What's YF? GOD Bless and take it easy, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Gary,

PM me with your email addy and we can correspond that way. I went to school with the son of the originator of the SaltWater/Yellowfin hull. Aloha, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Would love to have one here. Only thing is we are still rebuilding ours and are nowhere near completion. My father and I would love to attend one on the mainland if possible. Aloha, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

YF....yellowfin... :cool:

I'll ask about that engine specifically....

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Gary,

You may want to do some googling on the Bravo 3. I have done a bit of research and found that they had a BAAAD problem with corrosion. We used to run the old volvo 200 diesel and the 290 DP and are now switching to cummins and v-drive. We can talk more via email once you PM me your address. Check you later, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Thanks bayouboy,

We are planning to run the 5.9BTA 315 hp jacket water after cooled motor with a ZF V-drive. Either the 600 or 800 series. Thanks, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

CUMMINS ALL THE WAY!!!!
Have twin 330hp. cummins that work like a charm. No problems in 9 years( as long as ive had them)
The only negative is there loudness

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

Hey Tunatime,

What kinda boat you running? Must be a BIIIG one. Got a picture? Aloha, Greg

Re: Cummins Qsd4.2 320 Hp Vs Volvo D4 300 Hp
 

I have some working familiarity with the CMD 320, in that I've run a boat with the same engine in a 250hp rating. Unless I'm mistaken, that motor is not based on the 5.9 6bta block; it is a straight six and the block is made by an Italian
manufacturer (VM Mortori?) and marinized here by CMD. The good news I can give is that the boat I ran, a 23' Whaler, with the 250hp version and a Bravo 3 drive, ran great. The motor I believe is a common rail design, pretty quiet and smooth, and delivered excellent performance and economy (I have a 23' SeaCraft Sceptre with a 7.4 litre gasser and Bravo 1 as comparison). The bad news is finding a mechanic that knows this motor - even Cummins and Mercury certified guys seem mystified by this thing and obtaining parts can be a real pain. That said, these issues may have been resolved within the last year or two, but I am not aware of it. Recently, there was a thread on The Hull Truth forum started by the owner of a 38' Fountain sportfish express with a pair of these engines. If I remember correctly, while he was happy with the performance when the engines were running properly, he was experiencing multiple issues and much downtime (sorry I could not find the thread to link but remember it being in their general forum section).

On the other hand, I have no direct experience in running a Volvo D4, but have done some research on it for my own potential repower. It does seem a little heavy compared to other 4 cyl. engines, but I have heard good things about reliability. Volvo parts will be expensive, but I would be more concerned about just having a good Volvo (or CMD) shop in your area. Also, I have heard very good things about the DPR drive that the D4 is mated to, and it also is an electronic common rail design.

Hope this helps but remember this info. is coming from a non-expert source.
Best of luck,
Chris