Diesel-Powered 52-foot Outerlimits Hits 94 mph
 

It's been a busy and successful week, plus a few days, for the Outerlimits folks, http://speedonthewater.com/new-boats...ts-94-mph.html.

Have a great weekend.

sweet :) 94 mph is great and so so so fuel efficient

I bet if he used the FPT 560 they would have broke a 100mph

mike

Thats awesome it is a great riding boat Mike took me for a ride in it.

Would not have expected anything less from them! Good job

I can't wait for all the experts to weigh in. :rolleyes:

Sounds like a great setup. Well done.

Excellent!

I bet Mike wanted the most speed with the setup so it's an epoxy boat. I think FPT650s would get it over 110...

Very sweet:cool:

thats awesome, what do u think a single 1000HP and 1600ftlbs cummins would do in a a 29 foot tunnel hull

blow up

na, i know that wouldnt happen

...AND we're off to the races.

If it was a Fountain hull, it would have gone 112.

Carry on! :poopoo:

why are there not higher HP diesels for the marine world? H*ll a duramax or 6.4 powerstroke can easily put 550Hp+ to the wheels w/ just a tune?

Still happy to see a Cummins in it!

Look how many daily driven 6-800hp cummins there are running around? I was using the other 2 because they just make big power easier, everyone knows that a cummins is far and away the most reliable!!

Diesels are meant to be inline engine, much more reliable, cummins was a good choice lots of guys converting ford to cummins for the reliability.

Impressive!

Matt, do you know the displacement weight?
Thanks,
Dean

The other thing here is an inline 6 has perfect primary and secondary balance, which is another reason they run so long , aside from a ton of fewer moving parts that like to fail.

They dont run at 3000rpms for hours on end though.

Another point , differentiate from the rest , those 5.9 – 6.7 Cummins are real medium duty Diesels , used in a whole slew of real world vehicles and equipment , Dodge was real smart using that motor .

Excellent job to the entire OL crew..that is awesome..94mph out of a 52' long boat..closest thing out there is the 50 Hustler at around 87mph..much smaller boat...and the heavier 52' NT at 76mph....

Im curious with a pair..would 82mph be obtainable...very cost effective package.

Any engine bay shots.. Thanks Jeff

It would need a 10 speed gearbox from a truck to come in plane ,or it will set the world in smoke !

Dean,

I don't but I'll find out and report back on Monday. That said, I suspect that even with epoxy/carbon/kevlar lay-up it's a hefty beast, which will make the performance that much more impressive. Stay tuned.

Funny thing ... I just talked my girlfriend out of a diesel BMW and into a gasoline version of the same model. I need to loose my anti-diesel bias!

Does it have triples or quads?

I doubt if the boat would like all that weight back there. With the motor, transmission and drive, would be over 2000lbs probly.

"...Funny thing ... I just talked my girlfriend out of a diesel BMW and into a gasoline version of the same model. I need to lose my anti-diesel bias!" [Fixed your typo]


Yes that was a mistake. You won't find a cleaner, more powerful car diesel than the 3.0L BMW engine. 35mpg is hard to match with the gas motor...in fact it can't be done. Less than 7sec to 60 with a diesel is not too shabby either.

I think 82 would be doable with staggered twin FPT650s. Probly run mid 90s with 850s but those are race engines...

Trips.

So does a 90* V8 with a 90* crank.

I hate to say it, but this inline-6 is better than V8 is urban legend. I spoke to a Cummins engineer once, and asked him about why they use I6's instead of V8's. His response was "packaging", and slight cost reduction. There have been V8 diesel marine engines over the years by Catapillar, Cummins, and others, that ran just fine.

Michael

The only benefit is that they are naturally balanced. Theoretically that MIGHT add up to a marginal improvement in the life of accessories due to reduced vibration. But in practice, it doesn't make a difference.

At Cat we use 90* V's instead of 60*. A 60* would be perfectly balanced in a V12 configuration. But with the 90* we can have better harmonics in V8, V16, and V20 configurations. It's a compromise.

Banks marinizes duramaxes. Bust out your wallet and build one :D

V8 ??? Do not make me laugh,Here you and your so called Cummins Engineer correct this then:


http://en.wikipedia.org/wiki/Straight-six_engine

and have them remove this :
"An inline six engine is in perfect primary and secondary mechanical balance, without the use of a balance shaft. The engine is in primary couple balance because the front and rear trio of cylinders are mirror images, and the pistons move in pairs. That is, piston #1 mirrors #6, #2 mirrors #5, and #3 mirrors #4, largely eliminating the polar rocking motion that would otherwise result. Secondary imbalance is avoided because the crankshaft has six crank throws arranged in three planes offset at 120°. The result is that the secondary forces that are caused by differences from purely sinusoidal motion sum to zero.

An inline four cylinder or V6 engine without a balance shaft will experience secondary dynamic imbalance, resulting in engine vibration. As a general rule, the forces arising from any dynamic imbalance increase as the square of the engine speed — for example, if the speed doubles, vibration will increase by a factor of four. In contrast, inline six engines have no primary or secondary imbalances, and with carefully designed crankshaft vibration dampers to absorb torsional vibration, will run more smoothly at the same crankshaft speed (rpm). This characteristic has made the straight-six popular in some European sports-luxury cars, where smooth high-speed performance is very desirable. As engine reciprocating forces increase with the cube of piston bore, straight-six is a preferred configuration for large truck engines.[6]"

and put your V8 there instead ,with its two banks of 4 cylinders !!!! The V12 which are a pair of 6s connected at the crank are not good as well in your head.

BTW The Cummins Indy car was a straight 6 Also.

[

That was a great read! Thanks!

A V8 only suffers from the same characteristics as a 4 cyl if it uses a flat plane 180* crank, like a ferrari. 90* crankshaft V8s are smoother than V6s and significantly smoother than I4s.

Pairs of 4 bangers in a vee , then you need ; Cross plane cranks with the heavy counterweights and or external balance , No thanks , Not even in my truck , got rid of the last V8 diesel years ago , These inline 6’s do just fine even on very large Cats I am bidding now, plus they fit well !!

Steve, I think you have now officially lost your mind. Keith and I are trying to explain V8 engine balance to you. Since you won't listen people who actually have designed engines for a living, then finish reading the chapter on engine balance on your own where they discuss cylinder counts above 6.

After that move on to power pulses per crank revolution.

Michael

NO, YOU Lost your mind !! Coming in with this crap AND Miss my point by a Damn Grand Canyon ! OL I am very sorry about this drift OFF Topic here , That beautiful Boat you built and this plunge into V8's for some nonsense.

BTW Mikey1, I design and build Boats that these motors have to power, That said I have been thinking about a 38 foot inline 6 Boat with 2JZ Engines .



Let’s see firing in a V8 Cheby Crossplane ; 1 = L , 8 = R , 4 = R , 3 = L , 6 = R , 5 = L , 7 = L , 2 = R
Firing LRRLRLLR Banks , there is your sound now ,a flat plane like a Ferrari they alternate banks.

Mikey1, I have the solution to your power pulse Problem , How about a V8 Two stroke diesel ??





==

2JZGTE's and Cummins QSB's are good motors. If I had a choice I'd take a duramax or scorpion over the Cummins though.

According to Mike Fiore, the 52 SL weighs 15,000 pounds, dry.