||LinkBack||Thread Tools||Display Modes|
Horsepower is not "real", it cannot be measured directly. It's a number calculated with a mathmatical formula. 5250 is the constant used in the formula to calculate horsepower.
FFR4067, 392W, Vic. Sr. alum. heads, KB 10.2:1, Edel. perf 600CFM, FMS hyd flat tappet, Mallory HyfireVI, FMS stainless shorties, alum. flywheel, Tremec 3550II , 3.73\'s, PowerTrax locker, 15\" PSE GT-40\'s, GM Dark Carmine Red Metallic, no stripes
As for why 5252, I don't know. I believe it stemmed from measurements of literal "horse power" in the 18th century; there's more complicated equations with 33,000 as the denominator (the number of pounds a horse could lift in one minute), and somewhere along the line it boils down to the "short" formula above.
Can you tell I'm not a mathematician?
FFR3639. 5.0L + Paxton Novi 1000 = 368 RWHP. Need more twisty roads in Kansas...
Horsepower is work done per unit of time. One HP equals 33,000 ft-lb of work per minute. When work is done by a source of torque (T) to produce (M) rotations about an axis, the work done is:
(Note: Π = pi)
radius x 2Π x rpm x lb. or 2Π TM
When rotation is at the rate N rpm, the HP delivered is:
HP = radius x 2Π x rpm x lb./33,000 = TN/5,250
Horsepower is not "real", it cannot be measured directly."
Actually you have it backwards dynos measure HP then calculate torque. I always thought it measured torque myself until I talked with a DJ tech rep & heres something I pulled off right off their website:
Horsepower is "real" too. By that argument is speed (Distance/time) real either since one needs a calculation or if it's that constant thing, then Einstein may need to get real about E=MC<sup>2</sup>. [img]tongue.gif[/img]
"Those FFR guys are NOT rocket scientists. They're just some bunch of kit car builders anyway."
WOW I'm impressed! [img]graemlins/red.gif[/img]
357W-solid roller, 750 Holley 4150, World Class+ T-5, IRS
See www.dynapackusa.com for an example of a direct measurement dyno.
Coupe #307 - 5-link, SAI mod, Levy DA Koni's, Levy bumpsteer, 6-piston Wilwood's in front, 4-piston in rear, Forte/Wilwood pedal assy, hybrid 8.8/9" rear end, VPM front bar, VPM/own design variable rear bar, and lot of other little things so far........
"Did you use ANYTHING that came with the kit???"
- The Wife
Build photos here:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
|Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)|