My Flat Tappet Cam Wiped Out So I Decided To Go Roller

[L31MaxExpress]

It is different. Horsepower is just a different unit for work. Work is what we are really talking about when we move things like trucks.

Ultimately torque is what turns the tires. HP is a measure or calculation of how quickly that torque can perform the work.

As I said earlier, two 600 hp engines, semi diesel vs supercharged gas V8. The one with more torque is going to move more weight from a stop because it can put more torque to the tires through the available gearing.

 

[L31MaxExpress]

In the example above lets say the diesel makes 600 hp @ 1,500 rpm and the gas v8 makes its peak at 6,000 rpm. You could gear the V8 with a 4:1 gear reduction so its 550 ft/lbs is ~2,200 ft/lbs @ 1,500 rpm output speed of the gear reduction setup. Now the Gas V8 will make the same torque as the Diesel to the transmissions input shaft but it has to spin 6,000 rpm vs 1,500 of the diesel. Its easy to see why semi trucks use large, slow turning diesels and can run millions of miles. They are making the same HP, but loads of torque. Torque is what ultimately turns the tires to propel the vehicle.

 

[0xDEADBEEF]

Ultimately torque is what turns the tires. HP is a measure or calculation of how quickly that torque can perform the work.

Torque is a force. You can make 1 ft-lb or a 1000 ft-lb and do the same amount of work.

 

[L31MaxExpress]

Torque is a force. You can make 1 ft-lb or a 1000 ft-lb and do the same amount of work.

Put a torque wrench on your pinon nut on your differential and try to move your truck with 1 ft/lb of input torque and let me know how that works out for you!

 

[0xDEADBEEF]

Put a torque wrench on your pinon nut on your differential and try to move your truck with 1 ft/lb of input torque and let me know how that works out for you!

Give me a lever and a place to stand and I can move the Earth.

 

[L31MaxExpress]

Give me a lever and a place to stand and I can move the Earth.

I will not disagree, but as mentioned earlier there are physical limitations in practicality.

 

[0xDEADBEEF]

I will not disagree, but as mentioned earlier there are physical limitations in practicality.

Definitely. I think we have more agreement than it seems from the last 20 posts, LOL. Sorry PWTBI!

 

[PlayingWithTBI]

I just got home from lunch and a trip to HF to pick up an engine hoist and stand - another $336 to add to my build thread

Maybe I'll swap out my 4.11s to 5.56s so my 355 can get out of the hole - NOT!

 

[L31MaxExpress]

I just got home from lunch and a trip to HF to pick up an engine hoist and stand - another $336 to add to my build thread

Maybe I'll swap out my 4.11s to 5.56s so my 355 can get out of the hole - NOT!

Fun stuff.

Here is what cubes and stroke does. A 383 rotating assembly is not much if any different in cost than a 355 setup. The difference is merely some clearence grinding labor. A 383 will make a further jump compared to a 350 in this comparison, keeping everything else the same.

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[Erik the Awful]

Sorry to burst your bubble, It'll stay ~a 10:1 350 or 355 depending.

You were wanting to go to 4-bolt mains for future power increases but you don't want to punch it out to a 383? Either stay with a 2-bolt 350 and close the door on future power upgrades, or go 4-bolt 383. It's cheap, right now. If you're not feeling it, I get it, but if you feel froggy, jump! I agree with @L31MaxExpress that your cam will be a little tamer in a larger engine.

I think the big question is if you have the same cam and heads, will a larger displacement be more taxing on the TBI?