Hey everyone
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Joined: Mar 2007
Posts: 84
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Hey everyone
Sup fellas? It's been way too long since my last visit.Unfortunately money's tight these days so all of my car mods havefallen tothe backburner for now. I've been pretty busy since school ended in May. However in my month long absense I did manage to get my driving lights intalled. But the wiring they sent me was faulty, and only a couple of the halo colors worked. So they sent me a whole new wiring kit. Hopefully I'll get that in soon. I'll get some pics up when I do.
Anyway, I was wondering if there was an easy way to estimate horsepower at the wheels using horsepower at the crank? Oris there another way?I know my '88 LS has the 305, which I believe rj said was rated at 185 hp at the wheels. I was just wondering how my'01 would compare to that, at the wheels. If anyone could shed some light on this for me that'd be great.
Now it's time to run around the forum and play catch-up. Take it easy guys.
Anyway, I was wondering if there was an easy way to estimate horsepower at the wheels using horsepower at the crank? Oris there another way?I know my '88 LS has the 305, which I believe rj said was rated at 185 hp at the wheels. I was just wondering how my'01 would compare to that, at the wheels. If anyone could shed some light on this for me that'd be great.
Now it's time to run around the forum and play catch-up. Take it easy guys.
RE: Hey everyone
Hi `Jacob, Check out the below links.
Hope this helps..EnJoy your Summer : )
`Space
TunerCalcs - Estimate Quarter Mile ET from Wheel Horsepower and ... Aproximate Quarter Mile Time (ET - Elapsed Time) from Wheel Horsepower and Weight. Enter Vehicle Gross Weight (with driver) and Horsepower to the Wheels ...
www.tunercalcs.com/
http://www.tunercalcs.com/
Estimating HP
These figures are calculated based on two formulas that estimate the rear wheel horsepower it takes to travel 1/4 mile. One method uses the elapsed time ...
www.nightrider.com/biketech/calc_estimatehp.htm
http://www.nightrider.com/biketech/calc_estimatehp.htm
Acceleration Simulator
Max Engine Speed:, RPM, Rear Wheel Torque (drivetrain torque loss ignored) .... Estimate Horsepower · Estimate 1/4 Mile Time Estimate Top Speed ...
www.nightrider.com/biketech/accel_sim.htm
http://www.nightrider.com/biketech/accel_sim.htm
Horsepower Calculator
Estimate Your Horsepower! (THIS IS JUST AN ESTIMATE BASED ON SIMPLE CALCULATIONS! ... Tire width - Series - Wheel Diameter Example 275 - 60 R 15. Tire Width ...
www.speedworldmotorplex.com/calc.htm
http://www.speedworldmotorplex.com/calc.htm
Yahoo! Answers - Rear Wheel Horsepower and Torque estimate and 1 .....
2 answers - engine: chevy 355. 9.5:1 compression est Cam: advertise duration 304. 244/ 244 intake and exhaust @50 and 110 degres lobe seperation, ...
answers.yahoo.com/question/index?qid=20070701203016AAKsuS8
Joined: Dec 2006
Posts: 833
From:
RE: Hey everyone
Since I am a old timer
Lets see if I get this right
Years ago horse power was rated at the crank
When you would look at the old Chilton books ect you was able to see (I want to say around the early 70's) that the horse power rating were higher for the older cars were higher then the ones after that point with the same engine.
This was done because of insurance reasons.
After that point they were getting horse power rating at the wheels.
Lets see if I get this right
Years ago horse power was rated at the crank
When you would look at the old Chilton books ect you was able to see (I want to say around the early 70's) that the horse power rating were higher for the older cars were higher then the ones after that point with the same engine.
This was done because of insurance reasons.
After that point they were getting horse power rating at the wheels.
Joined: Dec 2006
Posts: 833
From:
RE: Hey everyone
Mechanical horsepower
See History of the term "horsepower"
The term "horsepower" was created by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines.
Watt was working with ponies lifting coal at a coal mine, and he wanted to define the power available from one of these animals. He found that, on average, a mine pony could do 22,000 foot-pounds (lift a bucket of coal weighing 22,000 lb. a distance of 1-foot) of work in a minute. He then increased that number by 50 percent and fixed the measurement of horsepower at 33,000-foot-pounds of work in one minute.
Under this system, one horsepower is defined as:
1 hp = 33,000 ft·pound-force·min−1 = exactly 745.69987158227022 W
SAE gross horsepower
Prior to 1972 most American automakers rated their engines in terms of SAE gross horsepower (defined under SAE standards J245 and J1995). Gross hp was measured using a blueprinted test engine running on a stand without accessories, mufflers, or emissions control devices. It therefore reflected a maximum, theoretical value, not the power of an installed engine in a street car. Gross horsepower figures were also subject to considerable adjustment by carmakers: the power ratings of mass-market engines were often exaggerated, while those for the highest-performance muscle car engines were frequently understated.
hp (SAE)
In the United States the term "bhp" fell into disuse after the American Society of Automotive Engineers (SAE) recommended manufacturers use hp (SAE) to indicate the net power of the engine, given that particular car's complete engine installation. It measures engine power at the flywheel, not counting drivetrain losses.
Starting in 1971 automakers began to quote power in terms of SAE net horsepower (as defined by standard J1349). This reflected the rated power of the engine in as-installed trim, with all accessories and standard intake and exhaust systems. By 1972, US carmakers quoted power exclusively in SAE net hp. The change was meant to 'deflate' power ratings to assuage the auto insurance industry and environmental and safety lobbies, as well as to obfuscate the power losses caused by emissions-control equipment.
SAE net ratings, while more accurate than gross ratings, still represent the engine's power at the flywheel. Contrary to some reports, it does not measure power at the drive wheels.
Because SAE gross ratings were applied liberally, at best, there is no precise conversion from gross to net. Comparison of gross and net ratings for unchanged engines shows a variance of anywhere from 40 to 150 horsepower. The Chrysler 426 Hemi, for example, in 1971 carried a 425 hp gross rating (often considered to be understated) and a net rating of 375 hp.
[edit] SAE-certified horsepower
In 2005, the Society of Automotive Engineers introduced a new test procedure for engine horsepower and torque.[URL=http://en.wikipedia.org/wiki/Horsepower#_note-5][
See History of the term "horsepower"
The term "horsepower" was created by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines.
Watt was working with ponies lifting coal at a coal mine, and he wanted to define the power available from one of these animals. He found that, on average, a mine pony could do 22,000 foot-pounds (lift a bucket of coal weighing 22,000 lb. a distance of 1-foot) of work in a minute. He then increased that number by 50 percent and fixed the measurement of horsepower at 33,000-foot-pounds of work in one minute.
Under this system, one horsepower is defined as:
1 hp = 33,000 ft·pound-force·min−1 = exactly 745.69987158227022 W
SAE gross horsepower
Prior to 1972 most American automakers rated their engines in terms of SAE gross horsepower (defined under SAE standards J245 and J1995). Gross hp was measured using a blueprinted test engine running on a stand without accessories, mufflers, or emissions control devices. It therefore reflected a maximum, theoretical value, not the power of an installed engine in a street car. Gross horsepower figures were also subject to considerable adjustment by carmakers: the power ratings of mass-market engines were often exaggerated, while those for the highest-performance muscle car engines were frequently understated.
hp (SAE)
In the United States the term "bhp" fell into disuse after the American Society of Automotive Engineers (SAE) recommended manufacturers use hp (SAE) to indicate the net power of the engine, given that particular car's complete engine installation. It measures engine power at the flywheel, not counting drivetrain losses.
Starting in 1971 automakers began to quote power in terms of SAE net horsepower (as defined by standard J1349). This reflected the rated power of the engine in as-installed trim, with all accessories and standard intake and exhaust systems. By 1972, US carmakers quoted power exclusively in SAE net hp. The change was meant to 'deflate' power ratings to assuage the auto insurance industry and environmental and safety lobbies, as well as to obfuscate the power losses caused by emissions-control equipment.
SAE net ratings, while more accurate than gross ratings, still represent the engine's power at the flywheel. Contrary to some reports, it does not measure power at the drive wheels.
Because SAE gross ratings were applied liberally, at best, there is no precise conversion from gross to net. Comparison of gross and net ratings for unchanged engines shows a variance of anywhere from 40 to 150 horsepower. The Chrysler 426 Hemi, for example, in 1971 carried a 425 hp gross rating (often considered to be understated) and a net rating of 375 hp.
[edit] SAE-certified horsepower
In 2005, the Society of Automotive Engineers introduced a new test procedure for engine horsepower and torque.[URL=http://en.wikipedia.org/wiki/Horsepower#_note-5][
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