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Oil Field Engines & Related Equipment

Superior 20 hp


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  #1  
Old 05-19-2015, 09:39:43 PM
Bone Bone is offline
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Default Superior 20 hp

Just became the proud owner this awesome machine. Been doing small hit n miss for years and am in love. I am wondering why it seems difficult to date superior engines. Records lost? Bad record keeping? I hear that later models have the date in the SN. Mine is 25370. I would love to have some sort of operators manual as well.
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  #2  
Old 05-19-2015, 10:40:19 PM
Bob Willman Bob Willman is offline
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Default Re: Superior 20 hp

My 25hp Type C is #23939.
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Old 05-19-2015, 11:02:16 PM
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Default Re: Superior 20 hp

Bob, mine is a type CM. what does that mean? Are our engines considered late model? What year is yours? it's the first question I get, how old is it? I'd like to be able to give 'em an answer. How much water column is needed? Will be ready to fire her up in a couple of days. Don't want to blow myself up! Thanks
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Old 05-20-2015, 09:52:50 AM
Bob Willman Bob Willman is offline
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Default Re: Superior 20 hp

I am not familiar with the Type CM and it is not mentioned in any of the documentation that I have seen so far. The 2 cycle Type C could be a gas powered or oil powered version with a different head for each fuel and appropriate plumbing. Recommended gas pressure is 7 to 10 inches of water which is 4 to 6 oz. The solid cast enclosed crankcase with splash lubrication is not shown in the 1930 National Supply Catalog but is in the 1939 catalog.

Bob
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Old 05-20-2015, 01:59:57 PM
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Doug Waggonner Doug Waggonner is offline
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Default Re: Superior 20 hp

Sounds like an early Ajax? single flywheel with a clutch on the other side? If so...the first 2 numbers in the serial number is the year of manufacture.
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Old 05-21-2015, 12:20:13 PM
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Default Re: Superior 20 hp

Here is a pic of my 20hp Superior.
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Old 05-21-2015, 03:04:08 PM
2wheelBob 2wheelBob is offline
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Default Re: Superior 20 hp

Interesting air inlet & mag. Are the 3 "extra" mag leads grounded out?
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Old 05-21-2015, 03:12:03 PM
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Default Re: Superior 20 hp

Yes the other 3 wires are grounded to the side of the Mag.
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Old 05-21-2015, 03:55:47 PM
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Default Re: Superior 20 hp

a hot tube sure would be fun on that!
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Old 05-21-2015, 05:46:44 PM
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Default Re: Superior 20 hp

Quote:
Originally Posted by Bone View Post
Yes the other 3 wires are grounded to the side of the Mag.
Which is true of all Ajax with a mag. Some are wired to do this internally.
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Old 05-21-2015, 08:15:57 PM
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Default Re: Superior 20 hp

What's the purpose of a 4 wire mag? I've seen a couple like that and it don't make sense.
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Old 05-21-2015, 08:22:44 PM
Bob Willman Bob Willman is offline
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Default Re: Superior 20 hp

The basic engine is similar to my 25hp. Yours has the optional water pump. The governor and magneto are also different. Mine has an OC magneto. I assume there is a 3" - 4" hole on top for the air intake perhaps with a sliding gate for adjustment purposes. The fuel system almost looks like a liquid fuel carburetor. I wonder if the CM was a liquid fuel modification.

Bob
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Old 05-21-2015, 08:44:23 PM
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Default Re: Superior 20 hp

What's the purpose of the 4 wire mag? Why not just a regular old Wico or Webster?

---------- Post added at 07:44 PM ---------- Previous post was at 07:35 PM ----------

It's defenatly a vapor carb. It uses propane and I assume it was originally natural gas off the well. Took the carb apart and was amazed at how simple it is. Genius simple. I'm assuming that it's a two stroke given the lack of valves in the head. If so, is it still hit and miss or is it throttle gov?
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Old 05-22-2015, 08:17:18 AM
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Default Re: Superior 20 hp

It has to do with gear ratio driving the mag. If they would have they could have used another ratio and a different design mag but they did what they did. Maybe it was to keep the mag at a certain RPM to assure a hot spark? Anyway, #1 fires TDC, #2@90 ATD, 3@BDC and 4@90 BTD. #1 fires the spark plug, 2, 3 and 4 all fire to ground or to the engine block. If they cross fire you have a problem. I know it sounds crazy. I decided a long time ago magnetos weren't necessarily designed for an engine but graphed on after the fact. There are many engines with mags on them that when you see how they are designed you say what were they thinking.
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Old 05-22-2015, 09:35:53 AM
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Default Re: Superior 20 hp

That's funny! Gonna put some propane to her today if i can get some kids to spin it.See what kind of noise it makes. Are these things hard to bump start?
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Old 05-22-2015, 10:33:45 AM
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Default Re: Superior 20 hp

They have compression on both top dead and bottom dead, makes them hard to turn in a full circle. It's better to load it with gasoline with the compression release open and pull it through TDC. If it doesn't fire make the full trip around again.
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Old 05-22-2015, 10:54:29 AM
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Default Re: Superior 20 hp

Quote:
Originally Posted by Bone View Post
If so, is it still hit and miss or is it throttle gov?
There appears to be linkage from the governor to a throttle control on the air intake. It should be a throttle governed engine.
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Old 05-22-2015, 11:16:21 AM
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Default Re: Superior 20 hp

I was thinking about the mag, if the piston hasn't cleared the intake ports by click #2 you could allow it to fire into the cylinder too, might burn a little of the left over fuel still in there. It would be easy to tell if it does, just pull the cover over the ports and roll it through and listen for the impulse while watching the piston. Never know, might make the engine be reclassified as "clean burn". Doug W. will appreciate that.
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Old 05-22-2015, 10:13:54 PM
Bob Willman Bob Willman is offline
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Default Re: Superior 20 hp

If all things are correct the usual start procedure is to rock the flywheels back and forth with the crank throw on top and with the fuel and spark on. Usually in 3 to 4 rocks it will fire going backwards and then run in the forward direction.
If all things are not correct you will get extremely tired after a few attempts.

Bob
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Old 05-22-2015, 10:35:55 PM
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Default Re: Superior 20 hp

Gonna try that.thanks

---------- Post added at 09:35 PM ---------- Previous post was at 09:26 PM ----------

Wore out everybody I know today. Hit only once. Don't take long to get tired of cranking. Getting a good spark, used propane, ether, and gas. I'm sure timing is good. Might try putting our Farmall M on it. At least my friends may stick around! Thanks for the advice. It sounds a lot easier than just constantly spinning it.
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