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They say that there's no replacement for displacement. Therefore it would be safe to assume that more displacement = more horsepower. But are displacement and horsepower proportional to each other. As in, say, there are two cars with identical setups, but with different displacements. Would the one with the larger displacement always have more horsepower? Also. Say that you have a 350SB V8. If a V6 were made (albeit a huge v6) with 5.7L of displacement, would the two see similar HP/TQ numbers?
This has just been something I've been thinking about.
A LOT has to do with the design of the engine. You see the 60s big block V8s putting out lame horsepower numbers, while the new 4-bangers can see some pretty impressive numbers. The design has improved so much in all aspects that it's not such a direct comparison.
One thing bigger displacement does tend to do is yield bigger torque.
I don't think have a 5.7 L v6 will give you the same power as a 5.7L v8. I don't know much about this stuff, but having 2 more cylinders is going to give you more power. There is also a lot more that goes into it, compression and stuff like that. Someone on here should be able to explain, since I would like to know also.
well...i think he knew that, but he was talking about similar builds. like say take an LS1 5.7 liter, and then make an engine that is almost exactly like the LS1 in how it is designed, compression ratio, cam, ect. but just make it a 6 cylinder that is 5.7 liters.
I dont know...the size of the pistons on a 5.7L V6 would be massive wouldnt they? the moving mass would be pretty large...so they probably wouldnt be as durable and whatnot. this is just me making guesses...but i figure it would make similar hp, but not as much. anyone else?
Thinking about it logically, it seems that the 5.7L V6 would get higher horsepower at a higher RPM range, but less torque, and that torque would be higher in the RPMs. The combustion chambers in the 6 would be bigger, and would therefore have more potential power, but the engine wouldn't run as smoothly as the V8 because there is 2 less cylinders turning the crankshaft. At higher RPMs, the extra cylinders don't seem to be as necessary, and therefore it seems as if the higher potential in the combustion chambers of the V6 would create more hp at a higher RPM. Of course at this point, the larger mass of the individual pistons would limit the potential power at higher RPMs...
Of course none of this is researched or tested, I'm just thinking out loud.
Thinking about it logically, it seems that the 5.7L V6 would get higher horsepower at a higher RPM range, but less torque, and that torque would be higher in the RPMs. The combustion chambers in the 6 would be bigger, and would therefore have more potential power, but the engine wouldn't run as smoothly as the V8 because there is 2 less cylinders turning the crankshaft. At higher RPMs, the extra cylinders don't seem to be as necessary, and therefore it seems as if the higher potential in the combustion chambers of the V6 would create more hp at a higher RPM. Of course at this point, the larger mass of the individual pistons would limit the potential power at higher RPMs...
Of course none of this is researched or tested, I'm just thinking out loud.
Yes, but that brings you back to the original setup of the equation, giving both engines equal setups, meaning both engines would have lightweight internals, therefore increasing the theoretical top end power of both engines, and hitting the same barrier, but at a higher RPM.
well the gas mileage would be terrible since you would have larger pistons and a larger chamber... also... I do think the top end would see an increase, but your torque would be greatly depreciated causing even more mpg falls. I'm thinking out loud just like you, but I keep thinking about having 6 body builders push a car... and then what about 8 average guys pushing a car. The average guys could spread out better and therefore put just as much power into it. I don't know.... are the pistons the same size on our cars as compared to the ls1? If so then maybe its a production issue and this way they cut back on product cost not having to produce two types of cylinders.
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Thinking about it logically, it seems that the 5.7L V6 would get higher horsepower at a higher RPM range, but less torque, and that torque would be higher in the RPMs. The combustion chambers in the 6 would be bigger, and would therefore have more potential power, but the engine wouldn't run as smoothly as the V8 because there is 2 less cylinders turning the crankshaft. At higher RPMs, the extra cylinders don't seem to be as necessary, and therefore it seems as if the higher potential in the combustion chambers of the V6 would create more hp at a higher RPM. Of course at this point, the larger mass of the individual pistons would limit the potential power at higher RPMs...
Of course none of this is researched or tested, I'm just thinking out loud.
With less cylinders the torque would higher at lower rpm, with more power coming in the low end. Think about rev happy 4L V12 as opposed to a similar sized V8. More cylinders = more horsepower at higher rpms.
Originally posted by SSMOWS6
i mean, you can always fly wes out there and since he's a tool sometimes, fashion him into a plow for the maro
All things being equal, more displacement will = more power. If you made a 5.7 liter v6 and a 5.7 liter 350, you have the same size engine so there is no increase in displacement. An engine's approximate displacement is attained by multiplying bore x bore x stroke x number of cylinders x 0.7854. The 350 will probably make more power due to a better optimized piston, rod, crank set up. If you take a small block 350 and the only things you change are boring it .030 over and increasing the stroke from 3.48 to 3.75, you now have a 383. If the heads, cam, intake, carb are the same, that engine is going to make more power.
the phrase "there's no replacement for displacement" is just a cute saying that V8 drivers use to sling at the import crowd and nitrous users. It's origins aren't really rooted in design theory
the phrase "there's no replacement for displacement" is just a cute saying that V8 drivers use to sling at the import crowd and nitrous users. It's origins aren't really rooted in design theory
Thats true...but its also true that the more displacement you have the better you will respond to mods correct?
Can someone explain why 3rd gen V8's weren't as fast as 4th gen v6's stock and had horrible gas mileage? What were they thinking?
If you're talking about the 305 motor, then yes, what you said was true and it was because they were poorly designed. However, 3rd gens with the 350 motor were good for mid 14s stock
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