Hi guys,
What's the upper limit of RPM for most 6/1 Listeroids.
Most seem to be governed at 650 rpm. Can they go to 800 ?....or even 1000?
Has anyone ever seen a BHP curve for these engines ???
Wondering what HP can be achieved at various speeds.
If anyone has one, please post it.
Cheers,
Veggie
as far as i know, the spoke style wheels will limit you to 650rpm safe speed.
no way i would push them to 850 or 1000
bob g
ps *shoulda bought a changfa*
(twist on "shoulda bought a squirrel" from great american race)
:)
I your right Bob. 650 rpm's is the safe limit.
You do not want a flywheel explosion.
Henry
no kiddin veggie, we changfa boys will take you back no problem,,
you just got to be alive,, we got enough near dead amongst our group!
so don't come back over to our side missing half your head, or with an arm torn off!
:)
bob g
Last I recall, the 6/1, 8/1 and 10/1 all have the same mechanical specs. The only difference being their type/size flywheel and their RPM... HP = torque over time. More of a given torque pulse in a shorter time period = greater HP...
As mentioned, the size and construction of the spoked 6/1 flywheels limit their RPM. Google "iron flywheel explosions", or just "flywheel explosions". There is some pretty good old time documentation from insurance investigations, as the wheels in many large industrial installations were insured. Both For the potential loss of a valuable industrial machine, and for the damage they could do if they fail. The best one I read about had some cool pics of the hotel room, I think 2 blocks away, where a very large piece of the wheel came to rest. Most of the ones I recall reading about were as a result of a governor failure and engine runaway, or a load/drive failure that the governor was too slow to deal with which resulted in an overspeed condition...
My wife accepts me even though I only have half a brain :D
I saw a few 10/1 listeroids run up to 1000 rpm but as Bob stated, probably different flywheels.
Just wondering, because if they could run up to 800 rpm, one might be able to get 4kw from the gen head.
You're probably right about the flywheel being the limiting factor. I would not go over 650 without some solid data to back it up.
Veggie
PS Nice to know you care Bob :)
I once saw the results of a 5 groove B section 30" diameter sheave explosion due to over-speed.
Pieces flew 50 feet away, through a wall, and demolished a computer sitting on a desk.
Above were holes ripped trough a corrogated steel roof 20 feet up.
Dents in walls and pieces of metal all around the failed equipment.
Scary!
Makes me think seriously about fitting some over-speed protection on the 6/1 ?
Veggie
This might be a good place to post this: ( From the document ronmar was talking about)
The flywheels are different for sure and some are internaly balanced. I'm thinking....are any of the higher RPM units externaly balanced?
All of these wheels are still drilled for balance, and depends on some, some have counter-weight cast in or added on. But higher as rpm goes up, diameter get smaller and tend to be solid disk with small holes or none.
Cheers, Wizard
I believe the higher speed Listeroids have countweighted cranks, smaller dia. flywheels, alluminum pistons, no counterweights on flywheel (with the exception of the 8/1).
Henry
dubbleUJay
Thanks for posting that chart...
According to the chart, the 23" flywheels on a 6/1 should be safe to 955 rpm.
With a stated safety margin of 3:1, it would appear those numbers are pretty safe.
Veggie
Veg, pleaose stay with the 650 rpm listing on these engine, if you want to increase the RPM get smaller fly wheels & go faster but don't do it without the right wheels. exploding cast iron is a terrible thing.
Scott R.
Hi guys,
I have no intention of going higher than 650.
I just wanted to know if these 6/1's had a limit which is higher than the standard governor setting.
Thanks for the feedback.
Veggie
That's good to know, we would like to keep you around :D
Scott R.
Quote from: Jens on October 03, 2009, 06:22:21 PM
Hey Veggie ......
You better hurry up with the setup of your new baby ..... just saw the news and the snow you guys are getting! No wonder that the vast majority of people in the world think that we live in igloo's <ROFL>
Jens
PS: Merry Christmas !!!
Ha Ha Ha, ( or should I say Ho Ho Ho!)
Fired up the wood stove today for the first time in 7 months.
I have the mighty Changfa, and a high speed 10HP/4kw Launtop diesel on standby.
I think it's prudent to strip down the Listeroid before first smoke.
(Good subject for a new thread)
I suppose I'll need a few months until I actually get it running.
Veggie
I wasn't going to say anything, 'cause I understand how it is when you get a new engine. But after completely tearing two down to nuts and bolts, and even stripping the paint down to bare iron, and then grinding that smooth, I have to say that's the way I'd recommend. It's very enjoyable, not physically hard work, and gives you an unsurpassed opportunity to really grok your engine.
Then, when you reassemble it and turn the last nut on it and smugly congratulate yourself on having no parts left over, unlike all those Japanese motorcycle engines you worked on, you'll know it's done right. And when you have bled the last bubble out of the fuel system and you hear the first "Chuff - chuff - chuff" of your engine accelerating up to speed, well, it just doesn't get better than that.
Quinn
I'll probably end up somewhere between quinnf and Jens.
Take some of it apart and see what I find. If the first samples look ok, I'll wipe everything down,
lube the key parts, put the covers on and fire it up.
The crankcase access port will give me good viewpoints to the far corners of the crank housing. Looking for signs of sand, slag etc....
Thanks,
Veggie
FYI,
The rep. for GTC listeroids advised that the maximum rpm for the 6/1 is 700.
Veggie