Got Boost?

[Zenmervolt]

True, but I wouldn't want to be anywhere near a 8L 4 cylinder at redline. 😛

Problem with boost though is there is a definitive limit, and that is in the fuel octane and cylinder compression pressure. But you can conceivably add displacement all day long with no limitation except physical engine size. Boost eventually reaches a converging finite limit equally for all engines as a function of fuel knock resistance. At that point the only parameter that can increase, for all intents and purposes, indefinitely, is displacement. Boring and stroking or adding more cylinders to an engine already under 60 PSI boost won't cross the detonation threshold like 1 more psi will. 😉

Given two engines, 10L and 10.1L, with heads with an infinite flow rate, both already at 1000 psi boost and using unicorn blood with a infinite octane rating for fuel, the 10.1L is going to make 1% more power always.

There are practical limits for both too though. 😉

My main point is just that there are too many factors in play during "real world" performance design considerations to narrow things down all the way to a single variable because, within realistic parameters, any single variable will have an effect and therefore be irreplaceable.

ZV

 

[exdeath]

There are practical limits for both too though. 😉

Haha we are way past practical at this point. 😉

 

[IcePickFreak]

I'm all for displacement myself, but well no shit "all else being equal" there's no replacement for displacement. You can only tweak volumetric efficiency so much before you need more volume to make more power, and if you changed the VE on the smaller one "all else" wouldn't be equal then anyway. That's no different than two identical engines with one running more boost, of course the one able to move more air through it is going to put out more power.

The difference is how each scales. You can max out boost in a car to where bad things are going to happen. Displacement, once you start hitting the limit on bore/stroke, you can always add cylinders (see the Pratt & Whitney "Wasp Major" 28-cylinder radial ICE used in WWII bomber/cargo planes, over 4000ci D🙂. Increasing displacement is going to have it's limit though too, luckily it's just way beyond what you're going to be able to fit into a car.

Diesels are the biggest since they can operate with a ridiculously large bore. iirc the biggest piston driven engine is used in ships and is a straight-12 turbo diesel with something like 3-foot bores and an 8-foot stroke.

Oh, and I bet a guy named Kenny Duttweiler might know of some 6 cylinders that would give this a run for it's money power wise, just sayin. 😉

All that said, I don't daily drive a 6L because I'm against displacement. :awe:

I think you missed my point. That "Integra" motor is 4.8L, running on Nitro, etc. Unless I'm missing something that Z06 is at the core a stock 427 Z06 motor (albeit with an assload of modifications).

Well technically it's an RHS 427ci all aluminum race block based on the LS6, it's not a GM factory block.

 

[exdeath]

Hey there is a MR2 with a radial engine out there. :awe:

 

[JulesMaximus]

Puts "1000 HP Supras/Lambos/Evos/etc" into perspective...

Then you boost a domestic V8 to 30+ PSI and you get 2000+ HP and break the dyno! :awe:

Anybody ever heard of a 2,246 HP 4 or 6 banger?

Yep, 2,000 hp is sweet, until it comes to the issue of tires, and chassis, and... um, driver skill. Oops...

 

[IcePickFreak]

Don't really read Hot Rod Magazine anymore, but came across this article and thought it was interesting. Gotta love LS motors. Obviously not 2000+hp, but that's still impressive for an old 4.8L.

 

[joutlaw]

Don't really read Hot Rod Magazine anymore, but came across this article and thought it was interesting. Gotta love LS motors. Obviously not 2000+hp, but that's still impressive for an old 4.8L.

That is an awesome article. Good read for any LS fan.

 

[Kadarin]

Don't really read Hot Rod Magazine anymore, but came across this article and thought it was interesting. Gotta love LS motors. Obviously not 2000+hp, but that's still impressive for an old 4.8L.

Makes me wonder what the Ford 5.4/5.8 will do. And apparently, you can buy it in street trim: http://www.roadandtrack.com/tests/drives/2012-shelby-1000