OPEN CYLINDER ??
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=141138
Printed Date: 01 Jan 2026 at 12:03am
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Topic: OPEN CYLINDER ??
Posted By: FREEDGUY
Subject: OPEN CYLINDER ??
Date Posted: 05 Aug 2017 at 6:40pm
| Just read a post on NAT regarding comparison of a F2 VRS a M2 and somebody replied that the M2's "open"cylinder would out-perform the F2's closed cylinder. Can someone explain the difference please. |
Replies:
Posted By: DiyDave
Date Posted: 05 Aug 2017 at 9:15pm
Has to do with total cylinder area, F has 6875 cu inches, M2 has 9964 cu in... THat's my guess, anyway...
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Posted By: Lonn
Date Posted: 05 Aug 2017 at 9:52pm
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Probably means open concave in the m vs closed concave in the f ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: TREVMAN
Date Posted: 05 Aug 2017 at 11:21pm
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Two different designs. F was a Baldwin design, two wooden bat fans, short walkers, cylinder house up front, concave closed, all material through the cylinder. M/L design, one fan, squirrel cage drawing air across its length rather than from the sides, increases capacity. Very long strawwalkers. Up front cylinder house, open grate concave design allowing some grain to pass through to a short carrier, increased capacity as not ALL material through the cylinder. More material could be fed and successfully threshed and seperated. Much more HP on M than F. Not really a fair comparision. My Dad's M2 at 40 inches had more capacity than his G 6 cyl gasser at 44 inch cylinder. Also likely had 30 more HP. HTH, Trev.
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Posted By: SteveM C/IL
Date Posted: 06 Aug 2017 at 9:49am
| I'm sure the reference is about the open concave having more capacity than closed. No question an M would whip an F. |
Posted By: DrAllis
Date Posted: 06 Aug 2017 at 1:28pm
| Models L and M series always had the "open" concave design. All other conventional Gleaners were closed concaves. You want to talk about capacity?? Re arrange the cylinder bars on an F-2-3 so there is a total of SIX bars instead of eight. The holes are already drilled in the spiders and it's just a matter of removing two bars and repositioning four to get things equally spaced. You cannot believe the cylinders appetite in green-stemmed soybeans !!! Of course cylinder bars must be in good condition for anything to work in tough soybeans, but with 6 bars it's even better. |
Posted By: FREEDGUY
Date Posted: 06 Aug 2017 at 4:09pm
| Dr., we DO have a F2('79) and am intrigued by your suggestion as will be harvesting beans this fall. I know there would be "in-field" adjustments invloved but are the basic cylinder rpm's concave clearance similar to stock # of bars? Any idea what the 6 bar setup would do for corn? Thanks |
Posted By: DrAllis
Date Posted: 07 Aug 2017 at 9:17am
| In corn/soybean country, we always use wide-tooth cylinder bars. I'd imagine the six bar cylinder would work in corn, but one might consider filler strips in the void areas to keep the cobs down against the concaves. The wetter the corn, the more probable this might be. Settings would be similar to an 8 bar, but less speed will be needed in some cases. Good sharp edged cylinder bars are essential whichever way you go 6 or 8 bars. |
Posted By: SteveM C/IL
Date Posted: 07 Aug 2017 at 12:39pm
| I cut beans for 18yrs with only 4 bars in an A2.Talk about eating anything put into it!Green stems,foxtail,morning glory,BIG wads of green whatever.... Ran same clearance and speeds.Keep eye on chopper belt after big bite of green. |
Posted By: FREEDGUY
Date Posted: 07 Aug 2017 at 7:51pm
| We have the wide-spaced bars that only have bout 350 acres on them(only harvest 35 acres/year; corn/bean rotation)and dad only put 1 stone through it so they should be in good shape. Thanks both Doc and SteveM, I think I will open the top of feeder house and do some "remodeling". BTW, we are only running 2 concave bars with very satisfactory sample, but with the new cylinder configuration,do you feel more concaves will be required(we have them)? Thanks again |
Posted By: SteveM C/IL
Date Posted: 07 Aug 2017 at 10:05pm
| All those years I ran 2 rows of rasp bar concaves for corn and beans. No problems.installed other 4 cyl bars for corn and only used filler bars one year on corn that didn't want to leave the cob.My beans are always dry(too dry) and corn between 18-16.Can tell you,wet corn shells HARD!. |