That's an easy one the 300HP 5.4!!

 

Hey, I liked that old motor. You had enough room to almost get in the engine compartment and work on the motor!

 

id take the 200 hp cummins,its a much better truck motor,but for what you need the 5.4 maybe suit you better

 

I agree... the 5.4 with 2 more cylinders in the front

 

Uh...tj...that 200 cummins may be a diesel, but it is STILL a 200 HP motor...

better for fuel economy, but as for pulling 8,000 lbs up a hill......lousy!!!

 

Uh...Crazy001...that Cummins motor has over 400 lb ft of torque. Sounds fine for pulling 8,000 lbs to me...

Ever see the HP specs on a semi's diesel engine? Maybe 400 HP (but 1500 lb ft of torque), pulling maybe 70,000 lbs up hills.

 

200Hp cummins. Hands down. If its still not enough power.....there is a fuel screw on them.....

I think the cummins 4cyl 3.9L would make an excellent full size truck motor. Oh wait, ford already offers that.

 

there are 18 wheelers out there that have 200 hp idk if it will pull 70k,but it will pull more than any gasser out there

 

An I4 cummins work be great for the F-150, but it isn't going to happen anytime soon. Dodge has the cummins locked up in the US, maybe if Dodge goes belly up the cummins will be available, till then the cummins will stay in a truck that isn't worthy to carry it. IMO the EPA ruined new diesels back in 07' and 10' will only get worse. I think I can say I'll probably own a CNG powered vehicle before I'll ever own a diesel.

 

Actually, yes, I have...I have a 2007 Freightliner Columbia with a Detroit Diesel series 60 motor, which has 450 HP @ 1650 RPMs, and 1650 lb-ft of torque at 1200 RPMs...

HP is HP....I've explained this many times before. The reason my work truck pulls hills so well is NOT because it has a ton of torque, but because it has a very wide power band, and a 10 speed transmission to keep it there. My work truck pulls JUST AS HARD at 1200 RPMs as the 5.7L Toyota V8 does at 6,000 RPMs....

six of one, half a dozen of another....torque can be multiplied, divided, and otherwised manipulated to get the twisting force you want...but without RPMs, you have NO POWER....

you could have 1,000,000 lb-ft of torque, spinning at ONE RPM....and you have 190 HP...that's it....yes, that means that your million lb-ft of torque is working just as hard as my beat up, old Chevy Blazer 4.3L V6 will.

HP = (torque*power)/5252

My freightliner makes over 300 HP from 1200 RPMs....and it will pull peak HP at 1650 RPM all day long, day in, day out without a problem... THAT is what makes a great truck motor.

Torque is NOTHING without RPMS to match...

 

Good stuff here and I'm with you...but I wouldn't call 1200-1650 RPM a "wide power band". I guess I'm not getting why your 450 hp will pull your Freightliner but yet you say that a 200 hp Cummins will have a problem with an 8000 lb load if you have a transmission that will put the engine near its power peak. I'm guessing the Cummins will also run close to its power peak all day long without melting down.

And to un-hijack the thread, I still don't think a turbo on a 2.5 liter gasoline four cylinder engine, probably with 250 hp, would make a very good truck engine when compared to the 200 hp Cummins. Guess we'll have to see what the hp and torque curves look like on the Ecoboost engines, and the real world will test their durability when run hard.

 

I doubt they're shooting for 250hp out of the 4 banger. that'd be way too close to the 4.6 2v motor. 200hp and 250tq would be very doable with a 2.5 liter, and it wouldn't need a whole lot of boost to do it... would be building boost relatively fast, at low rpm too, esp under load...

 

i believe the 3.9 I4 cummins puts out around 130 hp and it puts out around 360 ilbs of torque,it is mostly used for industrial purposes,but its also in many vans and commercial vehicles,but im guessing cummins has the capability to increase hp output,im also sure ford could develop a good one 2

 

Quote:////JUST AS HARD at 1200 RPMs as the 5.7L Toyota V8 does at 6,000 RPMs....


imo .....toyota trucks are overated..... its great to live here in ford country where you dont see guys driving toyota trucks, and when i do see one it is very rarley the 5.7 engine ... toyota will always be a contender when it comes to full size trucks and never the champ

 

I was just using the tundra motor as an example because of it's high HP rating, nothing else...

What I was getting at is that our current 5.4L V8 would pull a hill better than a 200 HP diesel would. Sure, it has lots of torque, but because it can't push that torque at higher RPMs, it can't pull as hard as our 5.4s would.

Sure, it would have an awesome low end, but compare it in almost every way to our current 5.4, it probably wouldn't sell, unless maybe it got great fuel economy, which is where I think diesels have their potential. I agree a 200 HP diesel would make a great pickup motor, but it would simply not satisfy those looking for a high HP motor, as it simply wouldn't pull as hard as the top end V8 everyone is offering.

Believe it or not, if you got the gearing right(CVT anyone?), our current 5.4L V8 could and would pull an 80,000 tractor trailer down the road, probably at over 60 mph, too...but probably with downright awful fuel economy.

When my work truck is loaded down to max gross weight, which is 80,000 lbs, I can get 7 MPG....my pickup truck towing an empty, 3,500 lb 24 foot enclosed car hauler only gets 9....