Looking for Max rated Torque output

[SKYCHENEY]

What is the maximum rated torque output for a 6v92TA marine engine rated at 465hp and at what rpm? I'd love to see a torque curve but I can't seem to find this info anywhere.

 

[jap201]

Its on boatdiesel.com, under engines, dd, find 6v92ta and you'll see there's like 13 data sheets. its diff for year and hp. fwiw: i can't find a 465hp there. only 270, 355, 435, 450, and 550

just went back again and looked at the 435. i don't see the torque curve, just hp and fuel

 

[SKYCHENEY]

Specifically looking for torque. Even 450hp torque curve would be helpful.

 

[jap201]

Yeah, sorry sky. thought boat diesel had the torque curves, but when i went back to look, i couldn't find them.

 

[SKYCHENEY]

Thanks for looking.

Anyone with educated guesses? (emphasis on the educated part, please )

 

[Photolomy]

So, maybe not exactly the answer you are looking for, but if you look at the second page, the torque curves for these motors look pretty flat, so maybe there isn't much of a curve, unlike with gasoline engines. Which would also explain the roughly linear relationship between RPM and HP. Also, these engines are not revved anywhere near what gasoline engines are revved to, which is probably why we don't see much of a "curve" where air and fuel dynamics start to dominate.

https://www.dieselrebuildkits.com/wp-content/uploads/2018/02/6v92-engine-specs.pdf

 

[madhatter1]

If you have HP at any given RPM torque is an easy simple calculation. I will convert for anyone that provides the values over RPM range. Have been looking for this on my 650hp 8-92’s but can’t find. Not sure about DD torque across the range VS max HP and torque at max but I do know my Cummins 270 HP engines in my 34 make a massive 735 lbs at much lower than max RPM. HP is useless at high RPM’s moving our big ole boats. Torque numbers are what are important.

In 98 when I repowered the 34 I gambled in the lower priced 270’s over the 330 or the 370 and won. They both make the same approximate torque over RPM range and higher HP is the result of RPM and better cooling. Only so much cubic HP at any given RPM for about any engine size.

The electronic age has yielded higher results but that is a gamble I would rather not take. If anything under prop those boats a bit to keep EGT’s safe.

 

[SKYCHENEY]

My guess from what I have seen is somewhere around 11-1200 lb ft, but I was trying to compare the old 92's to new technology engines. Its hard to make a real comparison if you don't know what you've got now for sure.

 

[Avenger]

The only listings for 6V-92s I can find that show torque are for industrial and certain automotive engines. None of them have the HP or maximum RPM of a marine engine. However, with minimal exception they all show peak torque at 1200 RPM.

I also, can't find any listing for a 465HP marine engine. However, I did find a 435 HP.



HP=TQ*RPM/5252 so If I can still remember high school algebra TQ=(5252*HP)/RPM.

This graph shows the HP at 1200RPM to be about 240. So, (5252*240)/1200=1050 lb ft.

Close enough?

 

[madhatter1]

The only listings for 6V-92s I can find that show torque are for industrial and certain automotive engines. None of them have the HP or maximum RPM of a marine engine. However, with minimal exception they all show peak torque at 1200 RPM.

I also, can't find any listing for a 465HP marine engine. However, I did find a 435 HP.

View attachment 44090

HP=TQ*RPM/5252 so If I can still remember high school algebra TQ=(5252*HP)/RPM.

This graph shows the HP at 1200RPM to be about 240. So, (5252*240)/1200=1050 lb ft.

Close enough?

This is right on the money. And the 6-92 is 50% larger than a 5.9 Cummins and has 50% more torque. As RPM's go up the torque generally drops even though HP is increasing. Excluding high strung high HP engines that are over producing for a given displacement. All you need is the HP curve over RPM range and you can plot torque over the whole range. I had to learn how to do this because back in 98 Cummins gave some random HP outputs for the 270/330/370 but all at different RPM's, So I plotted all 3 on graph paper and discovered that each 5.9 liter turbo charged intercooled engine made very close power outputs up to 2600. Then the 330 and 370 made more HP at higher RPM's in 200 RPM increments. The Detroits are different in that they still max out at 2300 do each jump in HP is a higher stressed engine. I think they are all good if run conservatively. Mine see 2300 briefly on occasion to verify top RPM is reached and temps are maintained to spot any impending issues. Then it's 1800 or 800 the rest of the time.

 

[tom5518]

What is the maximum rated torque output for a 6v92TA marine engine rated at 465hp and at what rpm? I'd love to see a torque curve but I can't seem to find this info anywhere.

I don't recall the 6V92TA ever being 465hp. I thought they were 450hp? I remember the roided-out 6-71TIB from J&T were rated at 465.

 

[SKYCHENEY]

I don't recall the 6V92TA ever being 465hp. I thought they were 450hp? I remember the roided-out 6-71TIB from J&T were rated at 465.

Mine show 465hp. On the hull number after mine, the tags show 485hp.

 

[SKYCHENEY]

The only listings for 6V-92s I can find that show torque are for industrial and certain automotive engines. None of them have the HP or maximum RPM of a marine engine. However, with minimal exception they all show peak torque at 1200 RPM.

I also, can't find any listing for a 465HP marine engine. However, I did find a 435 HP.

View attachment 44090

HP=TQ*RPM/5252 so If I can still remember high school algebra TQ=(5252*HP)/RPM.

This graph shows the HP at 1200RPM to be about 240. So, (5252*240)/1200=1050 lb ft.

Close enough?

Yes, that's close enough. I guess I should have searched for that formula.

 

[tom5518]

Mine show 465hp. On the hull number after mine, the tags show 485hp.

I did not know the HP ratings varied like that. Interesting, to say the least. Was Covington Detroit Diesel the supplier for Hatteras back then?

 

[kelpy]

Covington bumped them up.

 

[SKYCHENEY]

I did not know the HP ratings varied like that. Interesting, to say the least. Was Covington Detroit Diesel the supplier for Hatteras back then?

Yes, they are Covingtons

 

[dottieshusband]

(Horsepower x 5252) ÷ rpm = torque.. kinda

 

[krush]

(Horsepower x 5252) ÷ rpm = torque.. kinda

Not kinda, always. If you know the HP and the RPM, you know the torque.

Torque is an irrelevant number on a boat except for sizing the shaft.

 

[madhatter1]

Torque is king. It's what has the ability to move big heavy boats. My 34C is underpowered ("at the brochure") with only 270HP engines. But since they make big HP at such low RPM's they make 735 foot pounds of torque, much more that the 330HP 454's before them. Top end is similar but these can jump the boat on plane quicker and cruise at a higher speed burning less fuel.

A deficiency on the DD's in this arena is kind of similar to the high RPM engines like Yanmars. While they make nice HP numbers they can struggle to get on plane where RPM's come up and they really breathe. I have 650HP 8-92's on the 46 but while they make big numbers they struggle until turbo's spin up. Therefore while the HP and torque is there it only exists after the engine develops power. I had 20 people on the boat over the weekend for an event and it planed off like an underpowered single engine. But once turbos spooled up it took off like a rocket (may be a bit of an exaggeration). Cummins is the king of torque in my opinion. Big HP way down in the RPM range.

 

[oscarvan]

Therefore while the HP and torque is there it only exists after the engine develops power.

I read that a few times. It's profound man.