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Thread: Engine Dyno

  1. #1

    Post Engine Dyno

    [FONT="Co[FONT="Arial Black"]
    Hello All

    Whenever some body builds or buys an engine for some thing they claim gobs of horse power but no real data. There is a real easy and cheap way to build your own engine dyno. Moving or storing the engine after build can also be a problem. With this in mind heres what to do.

    Get a secure 2 wheel trailer and hook it up to your pick up using 2" or larger ball. Chain it like a normal trailer but use a good chain. The bed is not important.

    Build a good secure L shaped mount to bolt on the trailer using about 4-5 inch square tubing with a quarter inch wall. Cheaply loading your engine can be a problem but what works the best is a well protected prop to bolt to the out put of the engine. As the horsepower of the engine changes the load will have to change. If you want to use a water brake dyno you can but expect to pay more but keep in mind water freezes. The engine has to run WOT - wide open throttle when taking measurements corrected to RPM.

    As the weather, temperature, and humidity changes the power output will change. Some people THINK it doesn't make a big differance but it does. I have run many engines on a dyno so I know. Because of these changes you have to correct your readings to a standard atmosphere. The CF or correction factor must be noted. This is 29.92 inches of mercury pressure, 59.5 degrees farenheit , and 0% humidity. Some body got the bright idea of opening the outside door in winter to see the power go up. It does according to the CF , exactly.

    Because of this you will need an accurate barometer , thermometer , and a means of determinig humidty. The cheapest and easiest way to determine humidty is dry bulb versus wet bulb temperature.

    As the engine is loaded it will try to twist on your mount. Easily allowing the engine to twist is done using a wheel rim and bearing. The engine can be mounted using the original mounts to the turnable wheel and bearing.

    Measuring this twist force is the load on the engine. You can use a 1 - 4 foot bar monted some where on the center line of the engine. A 400 pound shipping scale from Office Depot can be used to measure this force. As the lever increases the load is increased.

    Use your internet search engine and go to flycorvair to see a dyno like this. I use google search to get a lot of possibilities. Please ask me or who ever on this board to get more info. Lee
    Last edited by leeschaumberg; 11-25-2008 at 12:33 PM.

  2. #2

    Default

    This sounds not only like a disaster in the making, but alot of work just to measure horsepower. I don't think I'd want to be near anything like that spinning a prop. I think I'll stick to the standard, professionally run engine dyno, inside a room designed just for that purpose.

  3. #3

    Post Engine Dyno

    Hello 190MPH

    A test cell or a Dyno made to run an engine is better but it will cost near 1 million dollars. I cant afford a million dollars may be you can. Spinning a prop is not dangerous unless safety precautions are not followed. Being a pilot of piston airplanes a spinning prop is only dangerous if you try to grab it while the engine is running.
    With out a dyno people can say they have a zillion horse power. People use a dyno like this to test the horse power accurately with out killing themselves.
    Think Alot
    Learn Alot
    Read Alot
    And Then Do It Again & Again

  4. #4

    Default

    I was not implying that someone go out and buy a dyno, which costs no where near a million dollars but probably more around 100k. I was saying that it would be cheaper and less of a hassle to go and "rent" engine dyno time by the day. I generally do this once a year at a cost of about $500 for the day, and if things go well, you usually don't need a full day. Going back to your weather vs. HP comparison, I can say that based on my experience on the dyno and at the track, vapor pressure(or grains of water) has the most bearing on horsepower. The humidity may be the same for 2 different vapor pressure readings, but the lower VP reading will make more power.

  5. #5
    Join Date
    Dec 2007
    Location
    Baldwin, NY
    Posts
    275

    Default

    Quote Originally Posted by 190MPH View Post
    I was not implying that someone go out and buy a dyno, which costs no where near a million dollars but probably more around 100k. I was saying that it would be cheaper and less of a hassle to go and "rent" engine dyno time by the day. I generally do this once a year at a cost of about $500 for the day, and if things go well, you usually don't need a full day. Going back to your weather vs. HP comparison, I can say that based on my experience on the dyno and at the track, vapor pressure(or grains of water) has the most bearing on horsepower. The humidity may be the same for 2 different vapor pressure readings, but the lower VP reading will make more power.
    LOL, My friend bought a new mustang dyno for his shop, in total, it cost $34,000. And it is safe, easy to use, and ive been on the rollers a couple times. Engine dyno's are far less to my knowledge.
    Voigt Precision Welding, Inc.

    Miller Dynasty 200 DX, Miller Syncrowave 250, MillerMatic 252, Hypertherm Powermax 45, Auto Arc Trailpower 8000,272+187 lb Peter Wright anvil, 120 lb Fisher-norris, and more! Buffalo drill press, Grizzly Horiz. Bandsaw, Edwards shear, Barth Shear, bantam mechanical ironworker, Hopkins fly press, Doall Bandsaw, brown and sharpe surface grinder.

    2007 Silverado 2500HD (tow vehicle)
    2000 Camaro SS (Race car)

  6. #6
    Join Date
    Jan 2007
    Location
    Midland, Mi.
    Posts
    313

    Default

    HaHa!

    One Meeeeeeeellion dollars!

    That'd be on heIIuva dyno, for sure!

  7. #7

    Default

    I don't know of a Million $ dyno, but what i do know is that Dyno's that can handle >1000hp are VERY expensive. Not a Million expensive but allot more than 34k. I would venture a guess of 200k for a large HP "rolling road"

    I think your "plan" is sketchy to say the least. If you want to test your HP and torque I recommend making an appointment with a performance shop. Better yet look into a local club in your area and inquire about dyno days. Most high performance shops will give a really good deal to clubs and the members can save a few bucks doing a couple pulls. Lets face it, if you put money into a vehicle why not spend another couple hundred to lay down some numbers?

    I heard a really good definition of HP, torque, over steer and under steer.

    Over steer: you bounce off the inside wall
    Under steer: you smash your tail lights on the outside wall
    HP: how fast you hit the wall
    Torque: how far you travel when you go through the wall

  8. #8
    Join Date
    May 2008
    Posts
    9

    Default

    Quote Originally Posted by Bryan L View Post
    I don't know of a Million $ dyno, but what i do know is that Dyno's that can handle >1000hp are VERY expensive. Not a Million expensive but allot more than 34k. I would venture a guess of 200k for a large HP "rolling road"

    I think your "plan" is sketchy to say the least. If you want to test your HP and torque I recommend making an appointment with a performance shop. Better yet look into a local club in your area and inquire about dyno days. Most high performance shops will give a really good deal to clubs and the members can save a few bucks doing a couple pulls. Lets face it, if you put money into a vehicle why not spend another couple hundred to lay down some numbers?

    I heard a really good definition of HP, torque, over steer and under steer.

    Over steer: you bounce off the inside wall
    Under steer: you smash your tail lights on the outside wall
    HP: how fast you hit the wall
    Torque: how far you travel when you go through the wall


    the mustang will handle 1k horse and yes you can find many different high HP and AWD dynos in the 30k range including maha,dynojet etc,sorry but your ventured guess is off.

    at my previous shop our maha was 25k used


    http://iowacity.craigslist.org/tls/916472948.html as an example a high HP dyno under 30k
    Last edited by beezaadict; 11-26-2008 at 02:30 AM.

  9. #9
    Join Date
    Dec 2007
    Location
    Baldwin, NY
    Posts
    275

    Default

    Quote Originally Posted by Bryan L View Post
    I don't know of a Million $ dyno, but what i do know is that Dyno's that can handle >1000hp are VERY expensive. Not a Million expensive but allot more than 34k. I would venture a guess of 200k for a large HP "rolling road"

    I think your "plan" is sketchy to say the least. If you want to test your HP and torque I recommend making an appointment with a performance shop. Better yet look into a local club in your area and inquire about dyno days. Most high performance shops will give a really good deal to clubs and the members can save a few bucks doing a couple pulls. Lets face it, if you put money into a vehicle why not spend another couple hundred to lay down some numbers?

    I heard a really good definition of HP, torque, over steer and under steer.

    Over steer: you bounce off the inside wall
    Under steer: you smash your tail lights on the outside wall
    HP: how fast you hit the wall
    Torque: how far you travel when you go through the wall
    Incorrect, it's a 2,000 hp, 225 mph capable unit. Mustang 1100 SE

    "Home :: Dyno Services/Tuning

    Dyno Services/Tuning


    Dyno tuning is available with our in house Mustang 1100 SE dynamometer. Our unit is rated up to 2000 hp and 225 mph. The eddy current unit simulates real world loads found on the street or at the track. Not only can our dyno be used for tuning but also driveability and diagnostic testing, 0-60mph testing, and mile drag strip passes.

    Dyno Services Pricing:
    Power Pulls (2) with A/F monitoring $70
    Power Pulls (3) with A/F monitoring $90
    Pass (2) with A/F Monitoring $85
    Pass (3) with A/F Monitoring $105
    0 - 60 MPH (2) $45
    0 - 60 MPH (3) $60
    Hour Rental with operator $200

    Are you and a group of friends interested in getting together to see who will drop the biggest number on the dyno? Contact us for our discounted pricing on group (minimum 10 cars) dyno days and see who can drop the bomb.

    Tuning Pricing:

    Basic Bolt on Tune: $350"
    Voigt Precision Welding, Inc.

    Miller Dynasty 200 DX, Miller Syncrowave 250, MillerMatic 252, Hypertherm Powermax 45, Auto Arc Trailpower 8000,272+187 lb Peter Wright anvil, 120 lb Fisher-norris, and more! Buffalo drill press, Grizzly Horiz. Bandsaw, Edwards shear, Barth Shear, bantam mechanical ironworker, Hopkins fly press, Doall Bandsaw, brown and sharpe surface grinder.

    2007 Silverado 2500HD (tow vehicle)
    2000 Camaro SS (Race car)

  10. #10

    Default

    I'm talking about strictly an engine dyno and associated room,etc. I know that 30-35 HP gains me about .08-.10 on the track.

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