Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 09-04-2006, 02:11 AM
tacoma200's Avatar
tacoma200 tacoma200 is offline
LawnSite Fanatic
 
Join Date: Mar 2004
Location: Southern Kentucky
Posts: 5,427
60" vs 72" power requirements

How much more hp does a 72" deck require to mow at the same speed as the same mower with a 60" cut? If I had a 27 hp 60 inch Scag Turf Tiger for instance how much more hp would I need if it were a 72" to cut at the same speed through heavy grass?
Reply With Quote
  #2  
Old 09-04-2006, 05:54 AM
rodfather's Avatar
rodfather rodfather is offline
LawnSite Fanatic
 
Join Date: Aug 2001
Location: Clinton, NJ
Posts: 9,632
probably around 5
Reply With Quote
  #3  
Old 09-04-2006, 09:29 AM
tomo tomo is offline
LawnSite Senior Member
 
Join Date: Feb 2006
Location: australia
Posts: 660
Quote:
Originally Posted by tacoma200
How much more hp does a 72" deck require to mow at the same speed as the same mower with a 60" cut? If I had a 27 hp 60 inch Scag Turf Tiger for instance how much more hp would I need if it were a 72" to cut at the same speed through heavy grass?

hello,thick wet grass
60 inch 30hp
72 inch35hp ## Look at all the out front diesels on market all with hp i mentioned
Even the new breeds of z turn toro 28hp 1.1ltr
kubota 28hp 1.1ltr
Iskei 33hp 1.5ltr
john deere 31hp 1.3ltr
Diesel is always prefered when heavy cutting. Diesel will always hold your speed better than gas engine in heavy conditions. tomo
Reply With Quote
  #4  
Old 09-04-2006, 10:35 AM
REALSLOW REALSLOW is offline
LawnSite Senior Member
 
Join Date: Jun 2006
Location: FLORIDA
Posts: 668
I calcualted how much power it would take to make a 72 go like a 60 and I came up with 35 to work like a 60 27 but what the hell do I know I was just figuring how much more grass had to be cut and pushed out the deck and it was alot!
Reply With Quote
  #5  
Old 09-04-2006, 11:42 AM
2manymowers 2manymowers is offline
LawnSite Member
 
Join Date: Apr 2004
Location: Mid-north Indiana
Posts: 116
Quote:
Originally Posted by tomo
hello,thick wet grass
Diesel is always prefered when heavy cutting. Diesel will always hold your speed better than gas engine in heavy conditions. tomo
Why is this true? Do diesels produce more torque for the same horsepower engine?
Reply With Quote
  #6  
Old 09-04-2006, 11:44 AM
Imow4u2's Avatar
Imow4u2 Imow4u2 is offline
LawnSite Senior Member
 
Join Date: Sep 2002
Location: West Chester,IA
Posts: 377
Quote:
Originally Posted by 2manymowers
Why is this true? Do diesels produce more torque for the same horsepower engine?

Yes sir, they do!
__________________
2010 Hustler 31/66
2010 Hustler 31/66
2007 Hustler Z 25/60 (Sold 1099 hrs.)
2006 Hustler Super Z 28 E.F.I. 66 (Sold 1079 hrs.)
John Deere 420 60" mower
Cub 48 hydro walk
Misc. Stihl and Shindiawa
2005 F-350 PSD DRW 4X4
2004 f-250 CCSB Lariat 4X4
2003 JD 4310 hydro 430 loader
2003 Grizzly W 60" state plow
1985 F-250 6.9 4 speed
Western 7' 6" pro-wings
6X14 single axle
20' open Trailer
Reply With Quote
  #7  
Old 09-04-2006, 11:46 AM
REALSLOW REALSLOW is offline
LawnSite Senior Member
 
Join Date: Jun 2006
Location: FLORIDA
Posts: 668
Quote:
Originally Posted by 2manymowers
Why is this true? Do diesels produce more torque for the same horsepower engine?
On the average a deisel will produce 1/3 more torque than gas because it does not turn many RPM to make it's HP that is also why they are low HP because they do not turn many RPM.
Reply With Quote
  #8  
Old 09-04-2006, 11:55 AM
2manymowers 2manymowers is offline
LawnSite Member
 
Join Date: Apr 2004
Location: Mid-north Indiana
Posts: 116
Quote:
Originally Posted by REALSLOW
On the average a deisel will produce 1/3 more torque than gas because it does not turn many RPM to make it's HP that is also why they are low HP because they do not turn many RPM.
The problem is very few manufacturers post the torque numbers for their engines. I think my 32 hp Generac gas engine(72" Dixie Chopper Extreme Mowchine) is plenty of power for short or thin grass, but for heavy lush or tall grass it is very underpowered. I now wish I had invested the extra money in the 50 hp turbo diesel that was available in the 2005 models.
Reply With Quote
  #9  
Old 09-04-2006, 12:37 PM
kc2006's Avatar
kc2006 kc2006 is offline
LawnSite Silver Member
 
Join Date: Apr 2004
Location: Northeast Ohio
Posts: 2,428
Like I said in another post, my 28efi is plenty for my 60" exmark but on a hustler 60" i'd want at least the 30hp kohler (maybe more power, I don't know what kinda power the 30's really have). For a 72" exmark, the 35hp briggs would be plenty, but I'd go diesel for fuel effeciency. For a 72" hustler, all they have is the 30hp and diesel, I wouldn't even think of a 30 on a 72" hustler, that would be underpowered I'd think, i'd go diesel for sure.
__________________
I might retire today
Reply With Quote
  #10  
Old 09-04-2006, 12:41 PM
olderthandirt olderthandirt is offline
LawnSite Platinum Member
 
Join Date: Aug 2001
Location: here
Posts: 4,905
I don't believe it takes that much more HP. The reason is that most mowers have so much more hp now than just a few yrs ago. The latest fad in mowers is who will put the biggest engine on. I had a Steiner with a 72" deck and a 20 hp onan gas and I had a Kabota with a 60" deck and 21 hp diesel. The Steiner out cut the bota in speed and quality in side by side mowing in long thick grass. This can be attributed to many things including design. But to your question once the blades are spinning it would be hard to bog them down with an extra ft. of deck, thats only 4" per blade. I'm talking about the average diffence between engines in the average heavy grass.
It was not many yrs ago that a 16 hp on a 54" deck garden tractor was considered a BIG engine
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 09:05 PM.

Page generated in 0.10649 seconds with 9 queries