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single stage model 50 snowthrower auger speed?


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#1 Pager450n OFFLINE  

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Posted December 29, 2014 - 03:16 PM

Since I had to fanagle a pulley system for my 400, im not turning OEM RPM on the pto shaft. Here is what I do have.
Engine RPM @ WOT- 3690
Auger speed @ WOT- 394


So, is my auger running too slow? Reason im asking is that I want to play with the new snow and the auger kept bogging down. I added some rubber flaps to close the gap to increase throw.

I have read that they (augers @ single stage) should be around 750ish to properly throw the snow.

Would a simple decrease of teeth, about 6 increase the speed?

Edited by Pager450n, December 29, 2014 - 04:06 PM.


#2 Pager450n OFFLINE  

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Posted December 29, 2014 - 03:19 PM

https://www.youtube....e&v=EULeid93Pr8


Edited by Pager450n, December 29, 2014 - 03:20 PM.


#3 Bill 76 ONLINE  

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Posted December 29, 2014 - 04:46 PM

If that's a single stage I belive its running to slow.Yes a decrease in the driven sprocket will increase the speed of the auger,I can't tell you how much without knowing how many teeth are on the drive sprocket and the driven sprocket.

Remember any increase in auger speed will need more power to drive it.


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#4 Pager450n OFFLINE  

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Posted December 29, 2014 - 06:38 PM

It has plenty of power. The diesel is a 19 hp mitsu,

 

auger 394 rpm

I agree, so heres what the drive and driven are sitting at

drive- 27teeth

driven-40 teeth

 

the drive shaft spins at 975 @ WOT.

 

so my ratio of the OEM is .675

if I went with a 38 tooth, it would be .71, increase of .05%=413 rpm

if  I went with 36 tooth, it would be .75, increase of 12%= 441 rpm

If I went with 34 tooth, it would be .79, increase of 17%= 461 rpm

If I went with 32 tooth, it would be .84, increae of 24%= 490 rpm

 

If my math is correct, then I should go with something no less then 34?

 

 

 

Whats your thoughts? 


Edited by Pager450n, December 29, 2014 - 07:29 PM.


#5 NUTNDUN OFFLINE  

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Posted December 29, 2014 - 07:18 PM

Is either the drive sprocket or the driven sprocket easier to replace or would they both be about the same?



#6 Pager450n OFFLINE  

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Posted December 29, 2014 - 08:02 PM

The drive sprocket is welded to the shaft, so only the driven. Now I might tackle that later. Good thought!

#7 Bill 76 ONLINE  

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Posted December 29, 2014 - 09:10 PM

Doing my math and a cheat sheet from google this is what I come up with

Using 27 tooth drive and 40 tooth driven the ratio is .675

With a drive sprocket speed of 975 rpm the auger should be turning 658 rpm

That puts you near where you want to be.

 

Math sometimes twists my mind if I think about it to much--so I could be wrong



#8 Pager450n OFFLINE  

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Posted December 29, 2014 - 09:18 PM

Hmmm, I hate math. Seems my accounts only subtract :)
 

 

your math makes sense, and mine is uhm......well..... uhm, I guess. 

I might go ahead and pick up a 36 tooth. I will run the engine slower, but have that little extra if needed.

 

I have read in a lot of 49 snowblowers that they do the upgrade to speed the auger and pick up some performance.

 

Now for the hard part, Pitch of chain????? 

Any help?


Edited by Pager450n, December 29, 2014 - 09:27 PM.


#9 Bill 76 ONLINE  

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Posted December 30, 2014 - 12:35 AM

Chain pitch is easy,it's the measurement of center of pin to center of pin of one link.



#10 Pager450n OFFLINE  

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Posted December 30, 2014 - 01:43 PM

Still a little slow. Is the pitch in mm or cm measurments?

#11 NUTNDUN OFFLINE  

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Posted December 30, 2014 - 01:44 PM

Should be mm or inches in fractions I believe. A lot of times the chain will have markings on it also.



#12 Pager450n OFFLINE  

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Posted December 30, 2014 - 01:58 PM

K, so I measured from three pins, it was 1 and 1/4".

I did look at the drive sprocket and even though it's welded on, I can make a new one. It has a 1/4" keyway on a 1" shaft. I have plenty, and could change it if that might help.

Edited by Pager450n, December 30, 2014 - 02:05 PM.


#13 NUTNDUN OFFLINE  

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Posted December 30, 2014 - 02:01 PM

Here are ANSI standard chain dimensions:
 
No..........Pitch..........Roller Diameter...........Roller Width..........Sprocket Thickness..........Working Load

25...........1/4" ................0.130"....................... 1/8"........................ 0.110" .............................140 lbs
35.......... 3/8"................ 0.200"....................... 3/16"...................... 0.168" .............................480 lbs
40.......... 1/2"................. 5/16" ........................5/16" ......................0.284"............................. 810 lbs
41.......... 1/2"................ 0.306"....................... 1/4"........................ 0.227" .............................500 lbs
50.......... 5/8"................ 0.400" .......................3/8"........................ 0.343" ...........................1400 lbs
60.......... 3/4" ................15/32" .......................1/2" ........................0.459"........................... 1950 lbs
80............ 1" ...................5/8" .........................5/8" ........................0.575"........................... 3300 lbs

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#14 NUTNDUN OFFLINE  

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Posted December 30, 2014 - 02:03 PM

K, so I measured from three pins, it was 1 and 1/4".

 

What is the distance between two pins? 

 

Here is an image to help:

Attached Thumbnails

  • sprocket.gif

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#15 Pager450n OFFLINE  

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Posted December 30, 2014 - 05:25 PM

I checked and it's 5/8" from pin to pin.....so, it's a 50?

I can find 36 tooth at 50 and 35.




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