Topic: weight vs. horse power how much do you think
Steve Dupree Dirt Freak
Total posts: 316
posted July 28, 2005 06:09 PM
Ok heres something i would like to hear. What do you think it takes out of your motor to turn 100 lbs. I have heard 100lbs more is like adding 20 hp. What do all of you think. I know it has to hit the ground but same motor same car is 100 lbs less 20 more hp if it hooks up.
bubba0six Dirt Maniac
Total posts: 146
posted July 28, 2005 08:15 PM
Less weight to power ratio not more hp 400 hp in a 2,000lb car is 400 hp the same engine in a 200lb car is still only 400 hp
posted July 28, 2005 08:36 PM
Newton's third law Force= Mass*Acceleration. Less mass requires less force for a given accell. Same force on less mass = more accell. It takes more force to accellerate more mass. It is often best to think in terms of pounds per horsepopwer. this is how NHRA classes drag cars of all makes and models to handicap the starts in drag racing
Eljojo Dirt Forum Champ
Total posts: 968
posted July 29, 2005 04:30 AM
Newton also said that "every action produces a direct and equal reaction." Only the amount of friction produced by the tire patch propells the car forward. Tractor pullers don't change the sled--they change the weight of the sled. Therefore forward bitein a stock car is affected by the weight which is applied to the rear tires.
sidebiteu259 Dirt Full Roller
Total posts: 56
posted July 29, 2005 11:50 AM
Which is affect in weight transfer with is a dynamic reaction not a static reaction so reguardless of how much rear weight you start out with static. It is the dynamic number that will tell the real tale. If i have two cars static weight is o say 40 in the rear on one and 60 on the other. And i can get the car with the static 40% to stand the front in up and transfer a ton of weight as to the car with 60 percent and it cant transfer weight for chit. which rear percentages works best for you.
iowa_dirt_track_girl Dirt Freak
Total posts: 461
posted July 29, 2005 09:03 PM
That is why they run ram couplers and lightweught flywheels less rotating mass
What they mean by adding 20 hp is that it takes more horsepwoer to get that weight spinning and when you dont have that weight to get going it wont eat up that 20 hp get what iam saying?
The motor is not making more HP its just getting it spinning quicker
Example spin a golf ball around then pick up a bowling ball the bowling ball spins hard and it takes more to get it spinning
WOW all this thinking is giving me a head ache LOL
iowatoolman Dirt Freak
Total posts: 369
posted July 30, 2005 10:55 PM
well to put it into perspective of drag racers ( yea i know this is dirt) but for every 100#'s you can take off the car it will take off a tenth of a second