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Nissan 3 cylinder 1.5l 400 hp motor weighs 88lbs

Old 09-19-2019, 08:59 AM
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september torque thread.
Should fall off the first page by new years.
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Old 09-19-2019, 09:02 AM
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A 1.5 liter motor with a turbine driven super charger producing 400 HP at 6000 RPM will have the same torque as a 6.5 liter normally aspirated motor producing 400 HP at 6000 RPM.

If the same 1.5 liter motor with a turbine driven super charger is producing 100 HP at 2000 RPM then it will have the same torque as the 6.5 liter normally aspirated motor producing 100 HP at 2000 RPM.

The question is, can both motors produce the same HP at the same RPM's from idle at 700 RPM to red line at 6000 RPM? I doubt it.
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Old 09-19-2019, 09:05 AM
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Originally Posted by Jeepman View Post
Last time I checked, propellers twisted...... and they are kinda what moves the boat when it comes to outboards
Yep. They are turned. By a rotational force. But the amount of thrust is dependent upon the power applied to the propeller. Power that can rotate a propeller of X size at Y RPM.

Since power includes torque there is no reason to bring up torque on its own.
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Old 09-19-2019, 09:05 AM
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Originally Posted by ken2 View Post
september torque thread.
Should fall off the first page by new years.
Is this fun or what?

You really think it will be over by new years?
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Old 09-19-2019, 09:44 AM
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Originally Posted by Jeepman View Post
only if the motor is powerful enough to get everything going without the turbo, motors as small as the OP posted are not. If the motor is not powerful enough to overcome the load without the turbo there is not enough RPMs and exhaust to spool up the turbo. Need at least 2000 RPMs, most turbos work better around 3000rpms.

Dead stop to pulling heavy load starting like outboards operate, do not fit well for small displacement turbo engines. Now a motor like in the Ecoboost, that would would work great. But super small turbo engines are for bikes, or on light weight boats like posted above for a mud motor. Outboard use would need more torque from the motor itself without the turbo.


FYI fords makes a 1.0L turbo motor that might work great for an outboard, and would expect Yamaha to do something similar in the coming years. It has a long enough stroke to work as an outboard.
The only way the turbo would not spool, is if it was way oversized for the application. This tiny 1.3l turbo engine makes peak torque under 2000rpm


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Old 09-19-2019, 10:51 AM
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With modern, properly sized VGT turbos, lag is more or less a thing of the past. The exceptions might be tractor pull or drag race engines that need absurdly huge turbo(s), and even those have come a long way in recent years. Look at the 3.5 Ecoboost engines, they make more torque at nearly all rpm than the mighty 7.3 Powerstroke did.

Wait, a 3.5L gasoline V6 outperforming a turbocharged big block diesel V8? Impossible.
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Old 09-19-2019, 11:10 AM
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Originally Posted by alloyboy View Post
Is this fun or what?

You really think it will be over by new years?
sorry. Should have asked about Indonesian outboard website, which brand outboard or what size boat is safe.
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Old 09-19-2019, 11:38 AM
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Originally Posted by ParkRanger View Post
With modern, properly sized VGT turbos, lag is more or less a thing of the past. The exceptions might be tractor pull or drag race engines that need absurdly huge turbo(s), and even those have come a long way in recent years. Look at the 3.5 Ecoboost engines, they make more torque power at nearly all rpm than the mighty 7.3 Powerstroke did.

Wait, a 3.5L gasoline V6 outperforming a turbocharged big block diesel V8? Impossible.
Fixed it for you.
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Old 09-19-2019, 11:42 AM
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The ecoboost probably out torques the 7.3 above 2000rpm. Below that, nah.
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Old 09-19-2019, 11:49 AM
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The mid 90s 7.3s only make low 400s at 2000rpm, and drop off quickly. The 3.5s make over 500 now (albeit a bit higher in the RPMs), but still make over 400ft lbs at 2000rpm. Either way, they make more torque than most 7.3s. So yeah, under 2000rpm the dinosaur oil burner wins. Notice I said nearly all RPM

Torque under 2000rpm is irrelevant for an outboard as far as "holeshot" or "turbo lag" is concerned, you are going to be well over 2000rpm the second you attempt to accelerate. No turbo gasoline outboard will be pulling skiers at 1600rpm.

Last edited by ParkRanger; 09-19-2019 at 12:04 PM.
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Old 09-19-2019, 11:51 AM
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Originally Posted by Elgreco809 View Post
The ecoboost probably out torques the 7.3 above 2000rpm. Below that, nah.
Plus I think we should put a 3.5 ecoboost in a couple full size school buses with the typical school bus driver (i.e. foot to the floor 90% of the time) and see how long they last...
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Old 09-19-2019, 12:03 PM
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Originally Posted by Jeepman View Post
Last time I checked, propellers twisted...... and they are kinda what moves the boat when it comes to outboards
Is that why the manufacturers put the tOrk numbers on the back of the cowling? 150 Torkz? 400 torkz?
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Old 09-19-2019, 12:15 PM
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Originally Posted by Jonboater View Post
Plus I think we should put a 3.5 ecoboost in a couple full size school buses with the typical school bus driver (i.e. foot to the floor 90% of the time) and see how long they last...
They would spit rods out all day. There be a reason Ford developed a big displacement naturally aspirated gasser for their HD trucks.
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Old 09-19-2019, 05:02 PM
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Originally Posted by Elgreco809 View Post
The ecoboost probably out torques the 7.3 above 2000rpm. Below that, nah.
The 7.3 sees a lot of use in marine applications... do not see them, or any marine motor being replaced by motors like the OP posted. In the real world just not enough torque in the little Nissan motor for anything heavy or loaded.
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Old 09-19-2019, 05:35 PM
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Originally Posted by alloyboy View Post
There can be torque without any power being created. But if power is being created in a piston engine then there has to be torque.

Torque is just a twisting or turning force. It does not and can not move a boat. The propeller being turned at X RPM due to torque creates thrust which moves the boat.

Since torque is a component of horse power, when one says that horse power is moving the boat then by default torque is part of the explanation. There is nil reason to mention torque on its own.

If one says that X motor produces Y power at Z RPM (say an Evinrude, a Yamaha, A Honda, a Mercury, a Tohatsu producing 75 horse power at 2000 RPM) they all have the same torque value. But again, it is power that is doing the work of accelerating and moving the boat. There is no reason to mention torque. Torque is inherent in the horse power.
I disagree, torque matters big time and can be mentioned alone. Torque is the twist force/ work a engine can produce. Load up a boat or pull something with a 250-300 outboard and then a Small Block or Big Block Chevy I/O. The SB/BB Chevy and its superior torque will show itself real quick when it gets right up on plane vs the struggling outboard.

Same deal towing, sure my last V6 makes similar horsepower to the big V8 in my truck. However the V8 absolutely smokes the V6 with any weight on the hitch, that’s torque. The V8 gets it moving faster and works less hard to keep it up to speed therefore consuming less fuel.
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Old 09-19-2019, 05:45 PM
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There is no replacement for displacement!!!
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Old 09-19-2019, 06:08 PM
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Take a thread, any thread and mention torque.

BAM!

Out come the torque weirdos.

The literate can explain, show examples and post links that explain how work is done and power is measured.

NO!

Keep torque weird.
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Old 09-19-2019, 06:40 PM
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Originally Posted by Milehog View Post
Take a thread, any thread and mention torque.

BAM!

Out come the torque weirdos.

The literate can explain, show examples and post links that explain how work is done and power is measured.

NO!

Keep torque weird.
go to any racing website, boats included and tell them that Torque is not important and see what the responses are. Or better yet go to any RV site and tell them the Nissan 1.5l turbo will outpull a Ford 7.3L.

only on THT, not even sure many here on THT understand how HP is calculated. The only "power" that goes into figuring HP is Torque....

as for the post about HP ratings. Yes on the motor is the HP ratings, this tell top speed it will go. Overall HP tells you the top end something will go. But it does not tell you how quick it will get to those speeds. A 500hp truck is not the same as a 500hp drag car, the drag car will be faster in the 1/4 mile due to torque. But both can reach the same speeds. Just take that F250 longer to reach top speed as compared to a camaro, but both around the same HP.

Last edited by Jeepman; 09-19-2019 at 06:57 PM.
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Old 09-19-2019, 06:41 PM
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Looks like we gots a good ol’ fashioned torque vs horsepower argument thread.

When we get it figured out, i’ll blow your mind by throwing in a certain type of oil that changes everything.
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Old 09-19-2019, 07:16 PM
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Originally Posted by Milehog View Post
Take a thread, any thread and mention torque.

BAM!

Out come the torque weirdos.

The literate can explain, show examples and post links that explain how work is done and power is measured.

NO!

Keep torque weird.
Here is a great example of my torque weirdness and why it’s dead on correct. Ford engine torque curves, take a look at the bottom blue line (3.7 V6) vs the purple line (5.4L V8), very similar horsepower figures. The 3.7 V6 is rated 305 horsepower peak, the 5.4L 310 horsepower. The 5.4 is WORLDS better and peak torque is way higher and at a much lower RPM. Torque is way more important than horsepower in heavy duty useage. Two great ways to make torque, turbocharger or more displacement (like the EcoBoost or 6.2 up top.....peak hp.....not what matters so much



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