Visit The Dirt Forum for More Information

Author Topic:   DYNO
YAZ
Member
posted February 01, 2004 03:04 PM

HOW MANY OF YOU DYNO YOUR MOTORS, AND IS IT
REALY WORTH IT. AND WHATS THE GOING RATE?


udecide66
Member
posted February 01, 2004 03:44 PM
WE dynoed once. Pretty similar experiecne about 5 hours total but only 3 hours or so run time and like 10 or 12 pulls. I think it ended up costing around 700 with the dyno time, operator and the fuel we used. It takes a while to get setup and then you have to let it cool down before pulling it out so you can see how an 8 hour day turns into only 3 or 4 hours of pulls. I am glad we did it for the experience and to have some hard numbrs to look at, but we didnt get a huge gain out of it. We played with timing and fuel mixture then carb spacers. I guess we were real close the way we were because we only picked up maybe 10 or 15 HP or so when we were done. I have heard of guys picking up 25 or 30 before so its not uncommon. You dont really have time to do cam swaps, or any big changes like that unless you have the cash to keep it on the dyno for a few days. Besides that an engine can dyno well and look good on paper but not perform well on the track so you have to keep that in mind as well.
If I were to do it again I would prob look into doing a chassis dyno. That way you could have then engine in the car with your ignition, your fuel pump, your drivetrain..etc. This would let you try different timing, jetting etc. but since there is less setup time you can be in and out a lot quicker. Last time I checked on this it was like 125$ for the frist hour and 65 per hour after or something like that. If you go to superflow website you can search for the nearest chassis dyno.


littleb24f
Member
posted February 02, 2004 05:11 AM
I have to agree on the chassis dyno option. Unless the motor is on the dyno with all your stuff (accessories, fuel pump, carb, dist. etc) it's not really a valid test. In the car, it's running all your stuff and weekly fuel.

I haven't had the $$$ to do the race car, but I have done it on my Tbird SC. The A/F ratio monitoring is great. I found about 50hp in the midrange from a lean condition. Can't wait to get the racer on. At the least, it will let you know where to gear it.

partsman2004
Member
posted February 09, 2004 08:22 PM
Just wanted to keep the chassis dyno idea alive. I have a portable Mustang 250 chassis dyno available within a 200 mile range of Winona Mn. We have found a ton of information gained and are currently looking for racer's or groups to lease the dyno to by the week.
This machine is complete with a enclosed trailer and generator. One of less than 25 unit's in the country set up like this. Check out mustangdyne.com for more spec's.
Email me for more info on the rate's to rent the machine and get ahead of the pack.

"While there resting, were testing."

------------------
Partsman


sjakes8
Member
posted February 10, 2004 06:05 AM
I'm fixing to put my late model on the chassis dyno in a couple weeks. We opted to go with the chassis dyno because you are getting real results of how that motor is going to be restricted by YOUR pumps, pulleys, etc., and you get the numbers that you are putting to the ground.

Theres 2 chassis dyno's in my area, they both charge $75 for 3 runs......not by the hour.

littleb24f
Member
posted February 10, 2004 09:28 AM
I don't know how much it cost us, Dad took care of that part. But it's a $100 to start for the first hour then any half hour after that. So I think it's $100 an hour? Money well spent,the pulls go really fast so in a hour you can tell what you're look'n for. We had our new motor on there the first time for the first load on the engine. After the 4th or 5th pull we saw that we were drop'n off to soon in h.p. So were done, you get all the raw data from starting rpm to finish, and that shows torque and h.p. per 1000 rpm. Were going again in march and if the cam adjustment is fine then we'll see what the most h.p. we can get and air to fuel ratio set right. Plus what will take away power for the really slick nights. you can adjust the engine as it's running and see very thing working at full throttle up close. Like is my butterfly really at W.O.T. when it is. It takes the guess work out and the "hope this works" and "lets see what this does" at the track. Plus the guys really like how the car hikes up when were on the throttle.


Back to the Archives