I have one in the shed you can have for $950.00! We used it a lot for Comers and J's with a Alfano attached.
Works a treat.
Regards Dennis
0409330025
I have plans to make one of these up myself.
I was going to use my mychron 4 as the data collection with a flywheel a bit larger than in that artical but was thinking along the same lines. Just have to have time to build it.
dennis can you send pics to 0434619506
Hi Mick,
It's for sale however belongs to a mate. It's in the corner of my shed and I need the room hence the price. Cost him heaps more to build. I'll dig it out in the morning for Photos.
Regards Dennis mick triantafillidis said:
dennis can you send pics to 0434619506
Interesting article. However, something to bear in mind is that exactly the same engine conditions will produce different outputs if the temperature, atmospheric pressure or humidity change. I did not see any reference to these variables, and correction for them. Perhaps that is part and parcel of the software?
It is failure to correct according to well extablished proven data correction factors that in all probability account for some of the amazing horsepower figures often quoted for J and S motors (or perhaps over correction).
A good kart dyno room will be air conditioned to maintain temperature and humidity at standard test conditions. The only variable that would apply then is for true atmospheric pressure (barometric and with appropriate corrections for altitude).
The warning on flywheel disintegration should not be underestimated. When a flywheel lets go, pieces do not fly off the periphery. The maximum stress is at the centre. Consequently, the flywheel will explode when it lets go. That retaining shell will need to be impressive.
When I started work (40+ years ago), some of the then old folk used to tell the story of the time that the design engineers decided to find out what speed a diesel engine flywheel was good for, as they planned to increase engine speed from 1,500 to 1,800 RPM. They set up an engine in the middle of a paddock, with a heavy steel enclosure very heavily sand bagged over the flywheel. They attached a wire to the fuel pump actuator, and retired to a safe distance. So that they could observe the tacho, they were set up with a telescope.
The engine was started, and they retired to their safe place, and slowly increased the speed. When the flywheel let go, there was a massive explosion with dust and shrapnel. Real myth busters stuff. Parts of the flywheel were found more than half a mile away. The engine was also destroyed.
Using the guidelines in this article should be safe, but they have not provided the warnings for nothing.
Terry Sheedy
Happy New Year Terry
At what revs did the flywheel let go ????????????
Was it considered a "safe" margin ?
"The factor of safety for all fibre ropes is 5. For ropes used to hoist or support personnel, it is 10." !!!
But don't get under the load OR stand with your feet each side of a strained rope !
Hi Mick,
Sorry the phone doesn't allow me to send photos hence they are attached here.
Any questions please call on 0409330025
Regards Dennis
mick triantafillidis said:
dennis can you send pics to 0434619506
Comments8
Hi,
I have one in the shed you can have for $950.00! We used it a lot for Comers and J's with a Alfano attached.
Works a treat.
Regards Dennis
0409330025
I have plans to make one of these up myself.
I was going to use my mychron 4 as the data collection with a flywheel a bit larger than in that artical but was thinking along the same lines. Just have to have time to build it.
dennis can you send pics to 0434619506
Hi Mick,
It's for sale however belongs to a mate. It's in the corner of my shed and I need the room hence the price. Cost him heaps more to build. I'll dig it out in the morning for Photos.
Regards Dennis mick triantafillidis said:
dennis can you send pics to 0434619506
Interesting article. However, something to bear in mind is that exactly the same engine conditions will produce different outputs if the temperature, atmospheric pressure or humidity change. I did not see any reference to these variables, and correction for them. Perhaps that is part and parcel of the software?
It is failure to correct according to well extablished proven data correction factors that in all probability account for some of the amazing horsepower figures often quoted for J and S motors (or perhaps over correction).
A good kart dyno room will be air conditioned to maintain temperature and humidity at standard test conditions. The only variable that would apply then is for true atmospheric pressure (barometric and with appropriate corrections for altitude).
The warning on flywheel disintegration should not be underestimated. When a flywheel lets go, pieces do not fly off the periphery. The maximum stress is at the centre. Consequently, the flywheel will explode when it lets go. That retaining shell will need to be impressive.
When I started work (40+ years ago), some of the then old folk used to tell the story of the time that the design engineers decided to find out what speed a diesel engine flywheel was good for, as they planned to increase engine speed from 1,500 to 1,800 RPM. They set up an engine in the middle of a paddock, with a heavy steel enclosure very heavily sand bagged over the flywheel. They attached a wire to the fuel pump actuator, and retired to a safe distance. So that they could observe the tacho, they were set up with a telescope.
The engine was started, and they retired to their safe place, and slowly increased the speed. When the flywheel let go, there was a massive explosion with dust and shrapnel. Real myth busters stuff. Parts of the flywheel were found more than half a mile away. The engine was also destroyed.
Using the guidelines in this article should be safe, but they have not provided the warnings for nothing.
Terry Sheedy
Happy New Year Terry
At what revs did the flywheel let go ????????????
Was it considered a "safe" margin ?
"The factor of safety for all fibre ropes is 5. For ropes used to hoist or support personnel, it is 10." !!!
But don't get under the load OR stand with your feet each side of a strained rope !
Hi Mick,
Sorry the phone doesn't allow me to send photos hence they are attached here.
Any questions please call on 0409330025
Regards Dennis
mick triantafillidis said:
dennis can you send pics to 0434619506
Attachments:
Sydney-20120107-00186.jpg, 77 KB
Sydney-20120107-00187.jpg, 69 KB
Sydney-20120107-00189.jpg, 70 KB
Hi All,
The Dyno Wheels got a new owner.
Regards Dennis