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Mower Blade Speed


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#1 Alc ONLINE  

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Posted July 04, 2013 - 03:20 PM

Is it me or do the newer mowers run a faster blade speed and if that,s better would it be worth changing the deck pulley to spin the faster on a older mower ?
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#2 JDBrian OFFLINE  

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Posted July 04, 2013 - 04:03 PM

It's possible Al. Look at the size of the motors they run. 25HP is common now versus 14-18 on the older machines. 


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#3 LilysDad ONLINE  

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Posted July 04, 2013 - 04:06 PM

I think there is some kind of safety rule about the tip speed of the blade. It can only run so fast. If it is a shorter blade, 20" vs 22", It can turn more rpms to get the same tip speed.


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#4 dropped82 OFFLINE  

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Posted July 04, 2013 - 04:25 PM

I was wondering the same thing. I've considered changing the pulley on my Case 226 48" deck. I figured the onan had enough power.

Eric

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#5 Alc ONLINE  

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Posted July 04, 2013 - 05:32 PM

Eric I was thinking the same my 318 now has a 20hp on it so maybe would changing the pulley give me a better cut ? I run it wide open and almost full speed but thats because it doesn't cut well full speed ok I'm really running it too fast now , I should being slower runn lol
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#6 LilysDad ONLINE  

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Posted July 04, 2013 - 05:43 PM

Just know that the faster it turns, the faster it will throw a rock!


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#7 dropped82 OFFLINE  

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Posted July 04, 2013 - 05:50 PM

Well the only reason I want to increase blade speed is so I can raise my tractor speed some. I don't want to run full bore but would like to move a little faster. I just figured blade speed is the reason why the Dixie Choppers and Scags can mow so fast. I know they have a lot of PTO power too. In the same sense I have no intentions on going that fast. I've read somewhere about John Deere having a step up kit for their decks. I can't find it anymore.

Eric

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#8 dropped82 OFFLINE  

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Posted July 04, 2013 - 05:51 PM

Just know that the faster it turns, the faster it will throw a rock!


Honestly with the way my 226 throws grass out now, I could see throwing grass in the neighbors yard after an upgrade lol.

Eric

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#9 HydroHarold OFFLINE  

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Posted July 05, 2013 - 01:20 AM

Didn't our esteemed congress limit blade tip speed some years ago on homeowner mower/tractors?  "Commercial" machines got more leeway in top blade speed.  I remember this discussion years ago on Satan'sTractorForum.  Supposedly the JD "7 Iron" deck gets a faster speed as it's related to "commercial turf equipment" and the same size "yellow decks" are slower turners...

 

I know the ZeroTurn that does my neighbor sounds like it's going half again faster than my 48C @ WOT.


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#10 Alc ONLINE  

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Posted July 05, 2013 - 05:48 AM

Well did a search and found this dated 1995  telling dealers to drop the blade spped to 19,000 fpm from 21,000 , guessing that was just for home owners . Anyway think maybe I should just measure my pulleys and do a little math, borrow the non-contact tach from work  just to see where I'm at before changing anything .

 

Attached Files

  • Attached File  1071.pdf   10.89KB   409 downloads

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#11 dropped82 OFFLINE  

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Posted July 11, 2013 - 11:12 PM

I did some research and math tonight and this is what I found. I have a 226 with the H46 48" deck. My drive pulley is 5" and the driven pulley is 4.75". With the 17" outer blades I'm getting approximately 16390 FPM. In comparison the Hustler Z has 18100 FPM which allows it to mow at 15 mph. Now I understand that deck design plays a part and in no way expect or want to mow at 15mph. So I have a 38" deck which has a 4.25" pulley on it. Doing the math I will have a speed of 18300 FPM with changing to that pulley. I don't want to go over 19000 FPM. That's seems a little unsafe for my neighbors. I'm going to try this swap and see what happens. Of course I just mowed so my findings will have to wait 4 more days for some grass to grow. I'm also going to rebalance and sharpen again to try to eliminate any variables. I want to make sure everything is in top notch condition before cranking the Franken-deck on lol. Wish me luck!

Eric

Eric

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#12 drbish ONLINE  

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Posted July 12, 2013 - 04:41 AM

Here is a  Service Bullentin that  Clinton Engines issued in 1958,pertaining to blade speed of rotary mowers

Some interesting info

Attached File  clintonBlade speed.PDF   2.13MB   104 downloads


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#13 bgkid2966 OFFLINE  

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Posted July 12, 2013 - 07:27 AM

I just use an MTD push mower for my postage stamp city lot. I raised the RPM of the Briggs 6.5 hp engine so it would mulch better. I am not

 

going to walk any faster with it! It does seem too mulch better, so it was worth doing in my opinion.

 

 

 

 

Geno


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#14 LilysDad ONLINE  

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Posted July 12, 2013 - 12:44 PM

Honestly with the way my 226 throws grass out now, I could see throwing grass in the neighbors yard after an upgrade lol.

 

You took the discharge flap off, didn't you?


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#15 dropped82 OFFLINE  

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Posted July 12, 2013 - 01:10 PM

The case deck has the chute built in. Its fixed.

Eric

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