10 pounds equal to 1 horsepower? - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech 10 pounds equal to 1 horsepower?

Print Thread

10 pounds equal to 1 horsepower? #1674780 09/21/14 08:19 AM 09/21/14 08:19 AM
Joined: Jul 2008 Posts: 133 Scat City, USA S SleeperBee OP member
SleeperBee OP member S Joined: Jul 2008 Posts: 133 Scat City, USA	A motorcycle racer recently mentioned this as a general rule in the mc racing community. Have you guys heard or embrace this in your racing efforts/designs? Thanks for the input. . . .

Re: 10 pounds equal to 1 horsepower? [Re: SleeperBee] #1674781 09/21/14 08:37 AM 09/21/14 08:37 AM
Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...	The ratio of pounds to hp as equal varies a lot from a low powered car to a high powered (per pound) car. It is correct at say 300 hp to 3,000 pds car weight, but at 750 hp to 3,000 lbs, it is 1 hp per 4 pounds. Weight gets kinda important at the high end of performance, doesn't it? It takes 34 hp for an 8.80 ET 3,000 pound car to go a tenth faster. Now figure the cost of that 34 hp gain over the 880 you are already making,$$$$$$$$$$$$$$ 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: 10 pounds equal to 1 horsepower? [Re: gregsdart] #1674782 09/21/14 08:49 AM 09/21/14 08:49 AM
Joined: Jan 2003 Posts: 20,177 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,177 Park Forest, IL	Kinda like the 100#=.10 rule. Way to many variable for it to be a solid rule. "Everybody funny, now you funny too."

Re: 10 pounds equal to 1 horsepower? [Re: SleeperBee] #1674783 09/21/14 09:47 AM 09/21/14 09:47 AM
Joined: Feb 2005 Posts: 4,313 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,313 Prospect, PA	As mentioned the relationship is not linear, as the car goes faster or slower it changes. I will say that for a bunch of years me and several friends did a lot of test and tune together and I can tell you that the relationship: 100 lbs = 10 hp = 1 mph = 0.1 sec is very close in the high 12s to mid 13 sec et range for a street car.

Re: 10 pounds equal to 1 horsepower? [Re: BSB67] #1674784 09/21/14 12:56 PM 09/21/14 12:56 PM
Joined: Feb 2009 Posts: 1,532 off the grid 340B5 pro stock
340B5 pro stock Joined: Feb 2009 Posts: 1,532 off the grid	I remember playing around w/one of those online calculators a couple years back and it came up 13hp per 10th until 10.0seconds. Then I skipped to 8.0 seconds and it took 40hp just for a tenth. I believe I had 3000-3100lbs plugged in for the weight. Yeah, it's got a smallblock.

Re: 10 pounds equal to 1 horsepower? [Re: SleeperBee] #1674785 09/21/14 04:20 PM 09/21/14 04:20 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: A motorcycle racer recently mentioned this as a general rule in the mc racing community. Have you guys heard or embrace this in your racing efforts/designs? Thanks for the input. . . . Not even close IMO Torque is torque, HP is RPM related to that torque. The Same torque at two different RPM,s will give you significant HP differences. Heres some examples. 10# x 1100 RPM /5252 = 2.09 HP 10# x 8000 RPM /5252 = 15.2 HP 10# x 11000 RPM /5252 = 20.94 HP If that Motorcycle races at 500 RPM, then he would be Correct. 10# x 500 RPM /5252 = .952 HP Close enough to 1 HP

Re: 10 pounds equal to 1 horsepower? [Re: Sport440] #1674786 09/21/14 04:38 PM 09/21/14 04:38 PM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	Quote: Quote: A motorcycle racer recently mentioned this as a general rule in the mc racing community. Have you guys heard or embrace this in your racing efforts/designs? Thanks for the input. . . . Not even close IMO Torque is torque, HP is RPM related to that torque. The Same torque at two different RPM,s will give you significant HP differences. Heres some examples. 10# x 1100 RPM /5252 = 2.09 HP 10# x 8000 RPM /5252 = 15.2 HP 10# x 11000 RPM /5252 = 20.94 HP If that Motorcycle races at 500 RPM, then he would be Correct. 10# x 500 RPM /5252 = .952 HP Close enough to 1 HP Doing the math. I love it. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1