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Old 12-06-2012, 03:52 PM   #31
TNTFarms
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Default Re: Model 49 snowblower sprocket upgrade step by step

gcaldicott - thanks for the tip, it doesn't appear that mine is going to hit but I will be sure to check it before I bolt the cover back on.

dan33klein - that makes two of us
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Old 12-08-2012, 04:41 PM   #32
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Default Re: Model 49 snowblower sprocket upgrade step by step

I posted this on another thread discussing the same ?upgrade.

Quote:
I have yet to see a GT with an engine big enough that a full bite of snow will not bog it down without reducing forward speed. The engine will only produce enough power to throw a given weight of snow a specific distance. A change in anything that is part of that equation will change the other values in the equation if the engine output remains the same.

More distance with the same engine means slower forward progress. Or, to put it another way, how far can you throw an engine? Now, throw it another 3' further without reducing its weight.

Commercial snowblowers are rated for tons of snow/hour that can be moved. If they need to move more than that, the engine has to be upgraded.

How well balanced is the impeller for your blower?
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Old 12-09-2012, 07:31 PM   #33
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Default Re: Model 49 snowblower sprocket upgrade step by step

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Originally Posted by TUDOR View Post
I posted this on another thread discussing the same ?upgrade.
I saw your comment in the other thread as well Bob and it certainly bears consideration. I've yet to see a video or hear direct commentary from anyone regarding their results in deep/heavy/wet snow with the increased rpm's and would like to very much.

Another concern I have involves trepidation regarding the effects of the increased rpm's when finding a buried shoe or boot or wet rolled-up newspaper or even a curb with all that rotating mass spinning even faster than before. (It concerns me even at stock rpm's...) I fear the whole blower leaping into the air and smashing against the front of my hood, making a messy dent at the very best. I fear parts and pieces flying off the blower as it disintegrates at worst.

I tend toward the conservative side of things and may be concerned over nothing. An increase of 10 or 20% in rpm's probably wouldn't make any real difference in anything, but doubling it seems to me that it could get down right dangerous!

Thoughts anyone?
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Old 12-09-2012, 08:00 PM   #34
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Default Re: Model 49 snowblower sprocket upgrade step by step

I don't think anyone was contemplating doubling the speed.
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Old 12-09-2012, 08:10 PM   #35
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Default Re: Model 49 snowblower sprocket upgrade step by step

Quote:
Originally Posted by Leinie View Post
I don't think anyone was contemplating doubling the speed.
I saw reference to someone using a 22 tooth pulley. I didn't do the math but...

It was more rhetorical anyway. A 10% or even 20% increase isn't likely to result in any real changes either way. In order to realize any real gain in distance, something more will likely be required and that to me seems to be when things would start getting dicey.

The OEM's have to be concerned with product liability and thus err on the side of safety. There's something to be said for that...
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Old 12-09-2012, 09:09 PM   #36
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Default Re: Model 49 snowblower sprocket upgrade step by step

I only wanted to increase my speed a little bit. And with such little change I am sure it may will work my 322's 18 horsepower yanmar harder but that is okay. As you mentioned in deeper snow you would have to slow down, well I would have had to go slower anyway. Just as with tilling the harder the ground the slower I have to go. I have seen a lot of guys do the upgrade and I just wanted to try it. I still have my factory gear in the even that I don't care for the performance. Here are the numbers for different sprockets.
40T = 88rpm stock
36T = 98rpm +11%
34T = 104rpm +18%
32T = 110rpm +25%
30T = 117rpm +33%

I agree that going to a 22 tooth would be crazy and there is no where near enough horsepower. Also has been stated in other threads these blowers were made for tractors with as low as 12 horsepower. I have 18 and an inline three so I should be okay with my 34 tooth.
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Old 12-10-2012, 09:35 AM   #37
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Default Re: Model 49 snowblower sprocket upgrade step by step

Quote:
Originally Posted by BillNole View Post
Another concern I have involves trepidation regarding the effects of the increased rpm's when finding a buried shoe or boot or wet rolled-up newspaper
Thoughts anyone?
Good point.
On mine with a 30 tooth, it ate a rolled up newspaper last winter and immediately the PTO belt broke.
I don't know for sure but I think the belt is going to be the weak link in the system, somethings gotta give and it may as well be the belt.
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Old 12-10-2012, 03:59 PM   #38
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Default Re: Model 49 snowblower sprocket upgrade step by step

Quote:
Originally Posted by gcaldicott View Post
I replaced my 40T with a 34T from Surplus Center. The only issue that I had was that the hub diameter is significantly larger than on the 40T that has a hub on both sides. The larger diameter hub on the 34T resulted in rubbing on the inside of the cover. The cone shape bump out on the cover isn't wide enough for the larger diameter hub. I ground the corner of the new hub at a 45 degree angle so that it wouldn't hit the cover. I didn't have to take too much off to get the clearance necessary.
This weekend I replaced my sprocket to a 30T from Surplus Center, and am not able to put the side cover back on. To get the chain to line up, I had to install the sprocket hub-side facing inwards, which may make a difference. Tonight I may try again, but flipping the sprocket and see if I can line up the chain.
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Old 12-11-2012, 12:35 PM   #39
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Default Re: Model 49 snowblower sprocket upgrade step by step

Its interesting to note that i watched this video and then tried to find out if he posted a follow-up clip showing how the 22T sprocket worked. Well he did, but not in the way you'd think. One of his next videos shows his model 49 sans gearbox because it blew on him, he then proceeds to show the viewers the 54" plow he got. Rut-roh.

He says he stripped the teeth so when something had to give, the gears did. The teeth on sprocket had a shearing force lower than what the snow against the impeller produced. I also speculate doubling the speed was more than the gearbox lube could handle.

Quote:
Originally Posted by itsjojo View Post
Here is an interesting youtube video. I have watched this guy on youtube. He has a 332 where he puts a 22? tooth pully on. You may want to watch him. I think yours is a Diesel too isn't it? Perhaps the diesel torque can push a smaller pully without bogging....
check the end of this video, he talks a little about it and you can see it.

http://www.youtube.com/watch?v=Tla500YrrJQ
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Old 12-11-2012, 02:44 PM   #40
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Default Re: Model 49 snowblower sprocket upgrade step by step

I found that a 1" smaller drive pulley was a lot easier way to speed up mine. Works great.
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Old 12-11-2012, 03:17 PM   #41
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Default Re: Model 49 snowblower sprocket upgrade step by step

Except I think you just slowed it down. You'd need to go bigger on the drive-side to speed it up.

/WW
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Old 12-11-2012, 03:30 PM   #42
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Default Re: Model 49 snowblower sprocket upgrade step by step

Quote:
Originally Posted by jwakeman View Post
This weekend I replaced my sprocket to a 30T from Surplus Center, and am not able to put the side cover back on. To get the chain to line up, I had to install the sprocket hub-side facing inwards, which may make a difference. Tonight I may try again, but flipping the sprocket and see if I can line up the chain.
I have also seen on one youtube video where the guy had changed the sprocket and the side shield didn't fit back. What he did was cut a hole in the guard same size as the dished out part where the socket sits. It looked really good and did the trick.
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Old 12-11-2012, 03:59 PM   #43
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Default Re: Model 49 snowblower sprocket upgrade step by step

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Except I think you just slowed it down. You'd need to go bigger on the drive-side to speed it up.

/WW
Nope. Smaller = faster. Just like everyone goes to a smaller sprocket to speed it up, whether it is the drive pulley or sprocket - it makes no difference. The only downside to doing the smaller pulley is that the gearbox also turns faster and could produce more wear. I wasn't concerned with that as it isn't that much faster and I don't run WOT that often anyway. My pulley was bend anyway, and had to be changed regardless. With my modern style spout mod, the snow flies great at 3/4 throttle.
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Old 12-11-2012, 04:45 PM   #44
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Default Re: Model 49 snowblower sprocket upgrade step by step

> smaller sprocket to speed it up, whether it is the drive pulley or sprocket - it makes no difference

Not to belabor this, but to avoid future confusion it doesn't really work that way. Putting a smaller drive sprocket on doesn't speed up the 'gearbox' -- only the throttle can do that. (or some upstream gearing change) Make sense?

To increase final shaft speed: bigger drive gear/pulley or smaller driven gear/pulley, or both.
(all at the expense of torque)

/WW
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Old 12-11-2012, 07:04 PM   #45
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Default Re: Model 49 snowblower sprocket upgrade step by step

He did not change the drive sprocket.
He changed the pulley on the gear box to a smaller one.
At least that is the way I understand it.
So he did speed up the gear box and auger speed.
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