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May be that my two pennies on the matter aren't worth even that much. I've never farmed with these engines but I have grabbed hold of the tail of many GM 2 cycle engine powered tractors on my dyno at our local show. One in particular was a Massey Ferguson 85 (I think) with a 3-71. I believe it was built for Ferguson by Oliver. Anyway, it had so much carbon in it from light parade type use, it blew soot balls like a steam tractor for 10 minutes but it still jumped right into what the dyno threw at it. After about 10 minutes 'clearing his throat' the peak HP rose 15 points. These engines tend jump into the load as well as most and better than many. When I push them with the dyno, they push right back with a vengance. They tend to jump on the load quickly yet I've never had one break into oscillation. When I push with the dyno they push right back maintaing speed right up to their rated HP. Only then do they begin to yield RPM's to the dyno. That's exactly what they're supposed to do! Granted they don't sound like they ever lug. For example a 4-71 at 1800 rpm gives you 7200 of his very abrupt exhaust reports every minute. 4 cylinder 4 stroker at 1800 only gives you 3600 reports each minute. When the 4-71 is dragged down to what sounds like 1800 RPM he falls flat on his face. Remember though he's actually only going 900! That's almost idle speed! How much does a 3010, 4010, 4020, an 806, a 4630, an 1855 or even a Minnie G706 or G1000 have left if you pull 'em down to 900? Sure they'll do it & they'll come back for more but it's not the way they were meant to run. When we want the show grounds to know something is happening over at the dyno, nothing will reach out & grab them by the ear quite like a Super 99 bellerin for all it's worth @ his peak output through a straight pipe! No I couldn't stand to farm that way but then, they didn't sell them that way either. I look at all this like the old which is better, Red or Green argument. The answer is and always has been yes! It depends on what you're up to as to which works best for you because each tractor and operator is different. These engines were maybe a bit too different for some. Maybe too different for most but it didn't necessarily make them bad. Sure some owners had nothing but trouble with them but as a friend of mine says, some guys can break the horn off an anvil! Like I said, just my opinion. Later.
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