[ARCHIVED THREAD] - Rice Rockets (Page 2 of 2)

Posted: 8/4/2004 12:31:03 PM EDT

[#1]

Heres something for the wannabe rice rockets to strive for:
Larry'Spiderman' McBride's nitro dragbike:

-4 cyl 1.4Liter Kawasaki 'type'engine(actually a Vortex head on Puma cases)
-over 1000 horseys*
-1/4 mile 5.88 @243 mph
of course hes runnin nitro and a Whipple screw blower too

You can build one too for about 80k

(*these guys dont care about max HP,there only allowed a single 14" slick and never put 100% to the ground...........its a big game of clutch management)

I think I read where Renault is going to build a V-8 that spins @19,000-20,000 RPM for F-1 in '05
That'll sound sweeeeeeeet!!

Posted: 8/4/2004 12:31:08 PM EDT

[#2]

Quoted:
Quoted:
Quoted:
Ohh....BTW.....Yes HP and torque do intersect @ 5250 rpm......(why?I dunno) its a good way to look at someones dyno sheet and tell if its in synch

Why? Because HP is a function of torque......

Which is the point that was missed......if the engine is putting out 800hp then let's say a random number like 500hp is occuring at ~5250rpm.......which means 500lbs-ft of torque is occuring at ~5250rpm.

The torque curve can't just go from nothing to 500 in a few RPM......

Granted, it's not the torque curve of a V8 or V10, but I wouldn't sneeze at 500lbs-ft of torque at 5250rpm.......

YUP........Thats understood.........(hell Id love 500@ 5250...........IN A DUCATI !!)

No I ment I couldnt figue out(remember) was WHY 5250? and WHY ALWAYS @ 5250(not 6215 or say 4875rpm??) whats so magical about 5250................(I think I read it years ago ....something weird to do with some law of physics)

Well, not to get too technical, but 5252 is the actual number, not 5250 and it comes from the equasion:

HP = 2*PI*TQ*RPM/ 33,000

which is simplified to:

HP = TQ*RPM/5252

33,000 comes from engineer James Watt who was working with ponies lifting coal at a coal mine, and he wanted a way to talk about the power available from one of these animals. He found that, on average, a mine pony could do 22,000 foot-pounds of work in a minute. He then increased that number by 50 percent and pegged the measurement of horsepower at 33,000 foot-pounds of work in one minute.

Basically it's an arbitrary number.

auto.howstuffworks.com/horsepower1.htm

Posted: 8/4/2004 12:33:01 PM EDT

[#3]

"Basically its an arbitrarry number"
Thats what I was wondering,
NewB Hunter................Thank you .

[ARCHIVED THREAD] - Rice Rockets (Page 2 of 2)

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[ARCHIVED THREAD] - Rice Rockets (Page 2 of 2)

[ARCHIVED THREAD] - Rice Rockets (Page 2 of 2)