Efm S15 S20 real difference
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What’s the real difference between the s15 and s20. The fire pots appear to be the same except for possibly the ash ring. Are the feed rates different, ie 7 clicks instead of 10. Are the cams on the gear box different that drive the ratchet mech. or ratchet gear a different size. Wondering these questions cause I have a s15 and wonder if it could be made into a S20 easily or not
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So correct me if wrong but change the ash ring and cam on gear box and now it’s a S20 ?
- StokerDon
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I'm pretty sure it's just the ash ring, 14" vs. 14.5" and the gearbox crank, 6 teeth vs. 8 teeth. There are some variations in the early S-15, S-20's, but if it is 1960's this should be correct.
The later S-20 with the small gearbox and the curved connecting rod will do 10 teeth.
In most cases, 4, 5 or 6 teeth is plenty so it would be easier to just swap the ash ring. 6 teeth would be 15 pounds per hour with Rice coal. Roughly 180,000 BTU.
-Don
The later S-20 with the small gearbox and the curved connecting rod will do 10 teeth.
In most cases, 4, 5 or 6 teeth is plenty so it would be easier to just swap the ash ring. 6 teeth would be 15 pounds per hour with Rice coal. Roughly 180,000 BTU.
-Don
- Rob R.
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The 14" ash ring is fine for 6 teeth of feed.
6 teeth is a fair amount of heat. The only people I know that run over 6 teeth are either heating multiple houses, or heating a commercial building.
6 teeth is a fair amount of heat. The only people I know that run over 6 teeth are either heating multiple houses, or heating a commercial building.
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Earlier models had a different fire pot. They had the gooseneck where the pot auger tube entered the pot in the bottom middle of the pot. The plate that dumps the fines has more holes in it. Let me see if I can get a picture real quick
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Those models are on high boys what scott is talking about
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Anyone know how tight a fire pot auger is supposed to fit into 2 inch sch40 stainless steel pipe. I just got a “new” one and the clearance seems off a bit to me. There is a half inch between the flights and the pipe. I thought it would fit semi tight like a 1/8 inch clearance. The 30 year old one is the same as the new one.
- Scottscoaled
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- Scottscoaled
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They are the old style stoker. They don't have gas holes in them. The bottom tends to rot out and they are hard to get apart without breaking them. I know some of the earliest 350's came with them as I've taken out three that were purchased new by the owners. I don't know about the highboys. I stay away from them.