Author Topic: Running Powerline 10/1 at 650RPM  (Read 9916 times)

Listerational

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Running Powerline 10/1 at 650RPM
« on: September 14, 2013, 03:18:51 PM »
Hello,

Would it be detrimental to my generator if I ran my Powerline 10/1 at 650RPM instead of 1000RPM. Utter Power talks so eloquently about the sound of a Lister running at 650RPM that I would like to hear it first hand. Of course I would have to change the pulley on the 1800rpm 7.5Kw ST head. But it may increase the longevity of the engine.


Thanks,

Jim

millman56

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Re: Running Powerline 10/1 at 650RPM
« Reply #1 on: September 14, 2013, 09:31:53 PM »
 In pursuit of a few hundred more watts I`ve just changed the alternator pulley from 4 3/4" to 5 1/2" on my 6-1 set and speeded it up from from 590 to 662 RPM,   its not exactly revving its nuts off in the scheme of things but it runs  noticeably less relaxed.

Listerational

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Re: Running Powerline 10/1 at 650RPM
« Reply #2 on: September 15, 2013, 05:07:38 PM »
In pursuit of a few hundred more watts I`ve just changed the alternator pulley from 4 3/4" to 5 1/2" on my 6-1 set and speeded it up from from 590 to 662 RPM,   its not exactly revving its nuts off in the scheme of things but it runs  noticeably less relaxed.

72RPM increase sounds like quit a jump. Interesting, how you can derive more power from a machine by asking it to turn at a higher RPM.
I imagine that it sounds more relaxed that my 1000RPM behemoth.

millman56

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Re: Running Powerline 10/1 at 650RPM
« Reply #3 on: September 15, 2013, 05:38:44 PM »
Jim,
the original CS engines apart from the 3-1 types are rated @ 5, 6 and 8 hp, the different power ratings are obtained purely by differing the engine speeds  ie  600, 650 and 850 with the 8 hp having an aluminium piston.   
A thousand RPM engine is a real screamer and would surely wear itself out in a few decades of running ;D

Mark.
 

Listerational

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Re: Running Powerline 10/1 at 650RPM
« Reply #4 on: September 15, 2013, 07:05:36 PM »
I better look into lowering the speed if possible so that I can get at least a century out of it.

cujet

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Re: Running Powerline 10/1 at 650RPM
« Reply #5 on: September 16, 2013, 07:03:14 PM »
I have a 20/2 twin that is rated to run at 1000RPM. However, I do not have it configured to run that fast. I run it at (by memory) 840RPM and 600RPM, with 2 different pulleys. My engine has the larger 24 inch flywheels and it seems to run just fine at either speed.
People who count on their fingers should maintain a discreet silence

Horsepoor

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Re: Running Powerline 10/1 at 650RPM
« Reply #6 on: September 17, 2013, 03:35:55 AM »
I also run my GTC 20/2 at 850 rpm and it runs well as the lower speed.
GTC 20/2 down rated to 850 rpm - ST 15
Metro 6/1 800 rpm on cart - ST 7.5

millman56

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Re: Running Powerline 10/1 at 650RPM
« Reply #7 on: September 17, 2013, 08:01:36 AM »
The  engines with heavy SOM flywheels  run more smoothly at any speed than the engines with light flywheels but it takes ages for them to get up to speed and start making juice,  on the plus side  when shutting down there is plenty of time to switch off and make a lesuirely exit through 40` of  trip hazards before the lights go out.

Mark.

Listerational

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Re: Running Powerline 10/1 at 650RPM
« Reply #8 on: September 21, 2013, 02:30:53 AM »
I can't wait to hear her purr at 650.

M61hops

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Re: Running Powerline 10/1 at 650RPM
« Reply #9 on: September 21, 2013, 03:46:44 AM »
Hi Listerational!  Before spending money on a pulley you might want to run the engine at different speeds to see if any feel or sound better/smoother than others.  The engine may have been balanced to run at 1000 RPM, or you may have a harmonic with the frame setup at a certain speed, so I'd check with a tachometer just to try and make sure you will be happy at the speed you want.  My 6-1 has a couple of speeds I'd avoid but it was an extreme case.              Leland
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millman56

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Re: Running Powerline 10/1 at 650RPM
« Reply #10 on: September 21, 2013, 09:09:54 AM »
Jim,
the original CS engines apart from the 3-1 types are rated @ 5, 6 and 8 hp, the different power ratings are obtained purely by differing the engine speeds  ie  600, 650 and 850 with the 8 hp having an aluminium piston.   
A thousand RPM engine is a real screamer and would surely wear itself out in a few decades of running ;D

Mark.
 
  Not entirely correct,  Bottleveg who really does know a thing or two about Dursleys finest, in another post mentions that the cam profile is different on an 8-1 also it has a 2" BSP exhaust flange which I have never noticed.

Mark.

needenginerunnin

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Re: Running Powerline 10/1 at 650RPM
« Reply #11 on: September 21, 2013, 10:27:39 AM »
that would explain why I have a cs exhaust with 2" bsp thread not the normal 1 1/2". you never stop learning ;D

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Listerational

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Re: Running Powerline 10/1 at 650RPM
« Reply #12 on: November 06, 2016, 10:52:08 AM »
How would one slow a 10/1 down?
Thanks,

dieselgman

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Re: Running Powerline 10/1 at 650RPM
« Reply #13 on: November 06, 2016, 11:52:26 AM »
For starters, experimentation and more experimentation. Loosen the speeder spring on the external governor linkages. Do a trial run at various speeds and see if it remains stable. There are a number of potential issues: 1.) Engine balance may have to be adjusted to accommodate slower revs. 2.) Governor weights may have to be changed to suit the lower revs if the governor hunts or becomes unstable under load. 3.) Depending on how far you want to change the speed, valve adjustment (to 6/1 specs) may also be necessary to get her properly tuned again.

It should not be too hard to adjust down from 1,000 to 750 rpm. It may be that simply adjusting your external governor spring will be enough. 650rpm will most likely call for a few more adjustments.

dieselgman
« Last Edit: November 06, 2016, 11:55:16 AM by dieselgman »
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Listerational

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Re: Running Powerline 10/1 at 650RPM
« Reply #14 on: November 06, 2016, 06:25:43 PM »
That sounds like a fun little hack to try.
Thanks.