Confusion about engine specs

P46-Curaçao · Feb 8, 2015

RT46 said: ↑

I just checked out the brokerage add for the boat.

if I were in the market, I would want to go see this boat.
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I fully agree, this boat looks well maintained!

Blue Goose · Feb 8, 2015

Capt J said: ↑

UMMMMM well, don't you think a phone call or email to the source, a Detroit Diesel dealer or THE Detroit Diesel dealer that marinized yours would give you all the information you want? Does it even matter what is in them? At 410HP they last, are reliable, and aren't too high in the HP ratings and the maintanence is the same. I'd also much rather have them then the same ERA/HP Man, volvo, or Perkins, even more then a 425hp 3208 (which didn't last....at 1800-2000 hours they needed rebuilds). 410HP 6-71's should go at least 5,000 hours between majors if not abused and more than likely closer to 10,000. I could walk into either local DD diesel dealer here with your serial number and they can tell me any part that is in YOUR motor.

See, the thing is, each company that marinized them did many different modifications to get to their HP rating, depending on what they were seeking or even what type of boat they were being put in. With the serial number, just about any DD dealer can look up exactly what's in your set. All of the 410HP J+T's had the same exact parts in them from engine to engine. Some owners even had dealers modify them to achieve different things. I ran a 58' Hatteras YF where the owner had DD of Daytona install 90 LPH injectors instead of 110LPH to save fuel and for them to run cleaner on the low end, without changing anything else.

CAT's also had some varients just like the D.D.'s. The origional 3412's were marinized by either Key Power or Gold Coast marine (I can't remember which), but they have lots of different parts on/in them that aren't Caterpillar parts, some might have even been made by the dealer. Then CAT stepped up to the plate, saw enough demand, and marinized the 3412's in house. There were other engines like that as well in the CAT lineup.
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Capt J,
I agree 100% and once I've gathered that information I fully intend to follow the several recommendations I've received similar to yours. My initial inquiry was to see if the engine actually existed. Since I was able to verify the 6-71N @ 310-hp was an engine that came in the 42 SF and I was able to find actual technical data for that engine proving that it existed, I was afraid that there was a misprint in the Powerboat Guide (410 instead of 310) that was simply repeated in the broker's listing. Obviously, I am now much better educated and am confident that the information is at least plausible. I will now follow the advise I have received to verify it. I guess I was just a little taken aback that in this day and age of easy access to information I have been unable to find a single technical source (old shop manual on ebay, exploded engine diagram, current after market manual still in print, technical data sheet posted on some obscure website...anything!) besides a sentence in McKnew & Parker's Powerboat Guide to even verify that this engine was ever produced in this iteration. Thankfully, I was able to find this forum and can rely on the first hand accounts of actual owners.

TNRiverFun · Mar 2, 2015

Blue Goose,

Can you keep us informed on that 42' Post with the 410 Hp 6-71 TI motors...? I'm really curious what it looks like in person and if indeed those engines are as advertised. I'm not in the market this year, but starting to do some back ground research on 41' - 46' SF boats. That was one of the best I've seen.

I'd prefer to stay towards the 41' - 43' range, but have also noticed a 46' Post in Destin with 6V92 engines having under 500 hrs I believe. The boat is a good bit rougher cosmetically and larger, but like the fact it's got 6V92 instead of the 6V71 TIB motors that so many Post have in them. They are nice boats, but wow the manufacturer really put alot of 450 - 485 Hp 671 DD in their boats. You almost never see used ones with over 1,200 hrs in them. That tells you alot.

That 410 Hp 6-71 Ti with under 400 hrs should be a nice boat for a loooong time if properly cared for.

Also, You may have noticed the Viking 41' in Knoxville with the 3208 Cats 375 Hp (1,500 Hrs) for $65K. Not a bad boat/motor combo for the price if it's all in good working order.

Good luck and hope to hear what that 42' Post looks like in person.

Blue Goose · Mar 3, 2015

TNRiverFun said: ↑

Blue Goose,

Can you keep us informed on that 42' Post with the 410 Hp 6-71 TI motors...? I'm really curious what it looks like in person and if indeed those engines are as advertised. I'm not in the market this year, but starting to do some back ground research on 41' - 46' SF boats. That was one of the best I've seen.

I'd prefer to stay towards the 41' - 43' range, but have also noticed a 46' Post in Destin with 6V92 engines having under 500 hrs I believe. The boat is a good bit rougher cosmetically and larger, but like the fact it's got 6V92 instead of the 6V71 TIB motors that so many Post have in them. They are nice boats, but wow the manufacturer really put alot of 450 - 485 Hp 671 DD in their boats. You almost never see used ones with over 1,200 hrs in them. That tells you alot.

That 410 Hp 6-71 Ti with under 400 hrs should be a nice boat for a loooong time if properly cared for.

Also, You may have noticed the Viking 41' in Knoxville with the 3208 Cats 375 Hp (1,500 Hrs) for $65K. Not a bad boat/motor combo for the price if it's all in good working order.

Good luck and hope to hear what that 42' Post looks like in person.
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TN,

I got ahold of Post and they emailed me the information they had from the original build the next day. It was delivered with the 6-71 TI(s) rated at 410 hp. I haven't called Johnson and Towers yet, but still plan to do that. The Broker also emailed some information relating to the overhaul that was completed. Spring has yet to make an appearance here (got 3 inches of snow today) so I haven't been in any hurry. My plan was to gather as much information as I could, then once the weather started to break, make arrangements to go see it and move forward from there depending on how she looked. I wasn't aware of the Viking you mentioned but I will look it up, Thanks for letting me know!

shore thing · Mar 11, 2015

I'd check very carefully around the front salon windows for leaks from the inside. I removed mine this fall and glassed in the holes. I still have some fairing and painting to do before that job is complete. Check around all the windows carefully for that matter.

I'd also check for moisture and soft spots around the area of the bow pulpit. Bounce on deck from the top to see if any flex, then go down below and stick your head and arms up into the anchor locker and feel around.

docjr03 · Mar 17, 2015

I just checked that listing and it says a sale is pending. Did you buy it?

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Confusion about engine specs

P46-Curaçao Senior Member

Blue Goose New Member

TNRiverFun New Member

Blue Goose New Member

shore thing Member

docjr03 New Member