400hp on pump gas

[Pete156]

Ryan P

[cdrazic93]

Originally Posted by Luckrider

literally just HP = (tq x RPM)/5250

Why /5250?

[cdrazic93]

Originally Posted by Shit Luck

Unless you count helping load cars. I got run over by a 410 sprint car when I was like 4...

OT but;

Am I the only one who thinks this would be great as your sig?

Anyway; Im curious about this from an engineering prospective, I would love to know how retarded the timing on those cams have to be for this kind of power, not to mention the piston head temp at the point of detonation.

[Calum]

Originally Posted by cdrazic93

Why /5250?

It's not something that's pulled out of the air, that is the definition of hp. Every dyno plot you see will have hp=tq at 5252 rpm. Torque is one of two components of horsepower, it's the intensity portion. The rate portion is rpm. In hydraulics those are pressure and flow rate. In electronics they are voltage and current. Every form of energy has those two components, with out either no work can be accomplished.
That's all torque is, a component of horsepower. Useless on its own. Think about it, given a four foot pipe you could generate 400ftlb of torque relatively easily. Could you use that to push a car past 2 mph. Nope, because it's just intensity with almost no rate.

Sent from my samstone

[Calum]

Originally Posted by moto-mike

I think you got the point

The up top HP number is not such a huge deal for reliability. The pistons speeds are much faster, and the torque number is what you have to watch. Overall 300 tq is not a big deal IMO. The fact that it holds up and carries it to redline just shows that it is tuned proper. Keeping it misfire free and holding to redline is no joke at those levels. If you look carefully at other dynos posted on this forum you'll find a serious lack of carrying it to redline past 7k.

Not to mention the graph is smoother than a lot of stock tune dyno graphs I've seen.

Sent from my samstone

[Luckrider]

Originally Posted by cdrazic93

Why /5250?

Originally Posted by Calum

It's not something that's pulled out of the air, that is the definition of hp. Every dyno plot you see will have hp=tq at 5252 rpm. Torque is one of two components of horsepower, it's the intensity portion. The rate portion is rpm. In hydraulics those are pressure and flow rate. In electronics they are voltage and current. Every form of energy has those two components, with out either no work can be accomplished.
That's all torque is, a component of horsepower. Useless on its own. Think about it, given a four foot pipe you could generate 400ftlb of torque relatively easily. Could you use that to push a car past 2 mph. Nope, because it's just intensity with almost no rate.

Sent from my samstone

Horsepower is a rate of work. It is literally define in watts and I remember when I was taking physics in highschool that is was an semi-arbitrary amount chosen as common rate of work that a horse was able to accomplish, if I remember correctly, somewhere about 734 Watts. A Watt is defined in Joules/seconds. A Joule is an amount of work and seconds are a length of time. This means a Watt is defined a work/time.

Now lets think about horsepower. HP is rated in (torque*RPM)/5250. RPMs are a speed with a defined time. In reality, 5250 is 1 minute. Thinking about the units we are applying helps show us their origin. As you can see here, we are getting work/time again. It simply becomes a multiplication factor as we are able to continue doing the same amount of work in less time (which is what revving over 5250 means). I could get into the conversions and how 5250 really came to be, but in all reality, I have neither the desire or dedication to dig up that math and try to write it out in a forum post.

[raven1231]

Congrats OP nice results best of luck with everything!

[cdrazic93]

Thank you gentlemen @Calum & @Luckrider, my physics teacher in high school was an idiot

[King Tut]

Originally Posted by moto-mike

The fact that it holds up and carries it to redline just shows that it is tuned proper. Keeping it misfire free and holding to redline is no joke at those levels. If you look carefully at other dynos posted on this forum you'll find a serious lack of carrying it to redline past 7k.

It is easy to do if you continue to ramp up the PSI as RPM increases.

[R/T Tuning]

Originally Posted by woode

Sorry I'm at work and on my cell phone so I'm not sure this will show up..

hows the car holding up @woode ?

[woode]

Still going strong, almost 8k miles later!

Aside from blowing several vacuum lines off, zero issues.

Recently moved so depending on how quickly I get settled in I plan on starting to build the engine and try to start getting some track time in.

[Raven604]

Originally Posted by Luckrider

Horsepower is a rate of work. It is literally define in watts and I remember when I was taking physics in highschool that is was an semi-arbitrary amount chosen as common rate of work that a horse was able to accomplish, if I remember correctly, somewhere about 734 Watts. A Watt is defined in Joules/seconds. A Joule is an amount of work and seconds are a length of time. This means a Watt is defined a work/time.

Now lets think about horsepower. HP is rated in (torque*RPM)/5250. RPMs are a speed with a defined time. In reality, 5250 is 1 minute. Thinking about the units we are applying helps show us their origin. As you can see here, we are getting work/time again. It simply becomes a multiplication factor as we are able to continue doing the same amount of work in less time (which is what revving over 5250 means). I could get into the conversions and how 5250 really came to be, but in all reality, I have neither the desire or dedication to dig up that math and try to write it out in a forum post.

746w...and 5252

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[Luckrider]

Originally Posted by Raven604

746w...and 5252

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Oh come on, that is like .00325% of a difference on RPM and you have to give it to me for remembering back 6 years to an arbitrary rate of work being that I got within several watts.

[Raven604]

Heh sorry. Ocd Electrician here

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