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Superior Oilfield Engine running at 34 rpm


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  #1  
Old 02-08-2017, 11:32:11 AM
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Default Superior Oilfield Engine running at 34 rpm

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Old 02-08-2017, 12:54:06 PM
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Default Re: running @17 rpm

Looks like it's firing about 80 degrees atdc! Excellent run, thanks.
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Old 02-08-2017, 01:53:18 PM
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Default Re: running @17 rpm

/\ Yes! I noticed that too! I figure that's how they're letting it fire on every revolution, yet not speed up.

BTW, I come up with twice that speed. I counted just short of 8 revolutions in 15 seconds. So firing ~17 times per minute, but running at ~34 rpm....
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Old 02-08-2017, 04:23:32 PM
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Default Re: running @17 rpm

Vanman you are correct.....not sure what I was thinking. Feeling very embarrassed!
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Old 02-09-2017, 01:51:45 AM
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Default Re: Superior Oilfield Engine running at 34 rpm

Oh, no problem. Listening to it or watching any of the other motion would certainly lead one to miss every other stroke when counting. I don't think any of us are used to seeing or hearing such slow speeds. That's just about the perfect speed for playing an LP, which would be a very amusing application. Made more amusing by the increasing and decreasing speed as it goes through the cycles.
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Old 02-09-2017, 07:17:23 AM
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Default Re: Superior Oilfield Engine running at 34 rpm

I like the way you do that. The cam timing is retarded so the exhaust valve is closing well after TDC. You have gotten the ignition timing dialed in by shifting the cam and using the gear clamps to hold the gib key and gear in position.

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Old 02-10-2017, 02:21:42 PM
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Default Re: Superior Oilfield Engine running at 34 rpm

I basically set the exh. cam timing so at TDC of the exh. stroke the rocker arm roller is just off the cam profile ramp. Going one more tooth one way or the other seemed wrong to me at the time.
I set the ign. timing up so at TDC compression stroke the WICO R1 was in the middle of it's timing adjustment range.
The thing I did that seemed most significant to me, was the adjustable throttle stop that I incorporated. I'm not sure why but I could not begin to get the governor adjusted. The engine would either over speed or just slow down and die. It was also difficult to start. I found that I could manually play the roll of the governor and control rpm quite well and this was when I dreamed up the throttle stop.
In the video I had the engine throttled down and I just adjusted the mag as retarded as possible, if the ignition timing is adjusted up to fire BTDC the exhaust note would get very quiet and rpm would increase to around 50 rpm. I also like the way it runs in this manor, it is very quiet and smooth.
To start the engine I set the mag to the most retarded setting and open the throttle stop up about 1/2" use the decompression roller and roll the engine over once to prime and it will usually kick off the next time around.
thanks for all your replies
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