[HillnGullyRider]

You caught it. The ratio is like 3:1 and the impeller is around 1500RPM
There's no way to change that ratio.

You could slow the engine RPM?....1500rpm impeller means 150rpm AUGER...although to me that looks closer to 200RPM....Is there no way to go 4:1 on the pulley?....This is all to dial it in for later of course, right now focus on making sure it's running and tuned well.

PS: It's a cool machine but I'd be figuring out a work around for that low handle bar height.
Operating it hunched over, is going to make it want to ride up deep snow.

 

[RalphS]

Action? - here you go!

I plan to do a walk-around video sometime soon too.

I would love to use that in one of the nearby towns that banned two-stroke leaf blowers. Early in the morning. Maybe even do the sidewalks in the neighborhood.

 

[JJG723]

Action? - here you go!

I plan to do a walk-around video sometime soon too.

I see you made the trek to Antarctica 😂, nicely done! 👍

 

[cpchriste]

YES CP!!!!! Great video!
Make and post some more content for the group. I’m assuming you have the oil tank from a jetski as a fuel tank because the original one cracked?

Yes, OEM tank is gone.

 

[cpchriste]

You could slow the engine RPM?....1500rpm impeller means 150rpm AUGER...

The 3:1 impeller/auger ratio means the auger is 500RPM - yes that's way too fast but can't be changed.

PS: It's a cool machine but I'd be figuring out a work around for that low handle bar height.
Operating it hunched over, is going to make it want to ride up deep snow.

The hunching is needed to make down force to make the front end ride up on its cast-iron rollers. The weight on the front is incredible! Again, that can't be changed but maybe the front rollers could?

 

[Snowball’s chance]

Yep, the front probably is 75% of the weight. You have to really push or lean on the bars to get the front up.

 

[HillnGullyRider]

That's interesting about the weight distribution, I did notice the bars were mounted forward of the rear tires. So perhaps the low bars would aid in steering???

If your engine was spinning 4500 RPM , 3:1 primary reduction at centrifugal clutch would be 1500RPM (impeller speed), and the auger would be 10:1 final reduction (typically) or 150RPM rake speed (200RPM if the engine was buzzed up to 6000RPM). If your auger reduction gear is only 3:1 then yes it would be 500RPM final reduction...but I highly doubt the final gear is only 3:1.

So a 3600 Engine RPM would be 1200 RPM at the impeller with a rake speed of 120RPM, or 400RPM at 3:1 final reduction, so I doubt it's only 3:1 final reduction on the auger.

A 900 RPM reduction in engine speed would lower the rake speed by 30% of what you're probably showing in that vid. You may want to put an electronic Tach/Hour meter on there because I doubt that two stroke is governed.

 

[Snowball’s chance]

It is actually governed. Also, it looks like CP has a tach/hr meter mounted to his in the video.

 

[Snowball’s chance]

I just went and looked and the auger. It looks like it’s a ~5.9:1 ratio. I’ll also include a couple pics of the unique impeller design (full circle) as well as a pic of the governor linkage.

 

[HillnGullyRider]

It is actually governed. Also, it looks like CP has a tach/hr meter mounted to his in the video.

I see it now, had the screen so dimmed looked like part of the fuel tank .....cant read RPM in the vid.
If it's 5.9:1? that is interesting, Suzuki wanted those rakes spinning at high speed?
5.9 would be about 250 rpm rake speed at 1500 impeller RPM, and 4500rpm engine speed....

 

[Snowball’s chance]

Someone could probably figure out the ratio by looking at the photos I posted of the pulleys early in the thread. That would give a more accurate number.

 

[HillnGullyRider]

Someone could probably figure out the ratio by looking at the photos I posted of the pulleys early in the thread. That would give a more accurate number.

Exact ratio doesn't matter much in this situation as both the auger gearing, and pulley reduction are fixed and unchangeable. A modern worm gear reduction is 10:1 for all brands, as this is the best compromise between common available ratio, cutting speed, and forward snow ejection. These Suzuki are probably bevel gear at 6:1.
Therefore the only adjustment has to be set with the throttle, and despite this being governed, it seemed like it had a wide adjustment range on the throttle, even after the centrifugal clutch engagement.

 

[cpchriste]

I see up to 6000 RPM on the engine tach. The governor is not currently very effective at holding an upper limit. The double vee belt pulley ratio is 4:1 giving a impeller speed of 1500 max. Strangely enough the belt tensioner rides on the inside of the belt loop. Near the end of the operation video you can hear the frequencies of the engine and of the impeller diverge and re-converge: I think that's cause by belt slippage due to insufficient wrap around the drive pulley.

The auger/ impeller ratio is 5:1 (I misremembered) through the bevel drive gear case so that's 300rpm at the augers.

Here is the walkaround video.

There are some factual errors in the narration, I'll clean those up later.

 

[HillnGullyRider]

I see up to 6000 RPM on the engine tach. The governor is not currently very effective at holding an upper limit. The double vee belt pulley ratio is 4:1 giving a impeller speed of 1500 max. Strangely enough the belt tensioner rides on the inside of the belt loop. Near the end of the operation video you can hear the frequencies of the engine and of the impeller diverge and re-converge: I think that's cause by belt slippage due to insufficient wrap around the drive pulley.

The auger/ impeller ratio is 5:1 (I misremembered) through the bevel drive gear case so that's 300rpm at the augers.

Here is the walkaround video.

There are some factual errors in the narration, I'll clean those up later.

Excellent walk around, that thing cleaned up nice.
4:1 makes much more sense on the primary reduction.
5:1 on the bevel is not quite ideal, you'd have to run it at 3000rpm just to get close to modern auger speeds, but that would bring the impeller down to 750 RPM which wouldn't work very well. Unfortunately you'll just have to live with the forward ejection . This machine is too classic in it's original form, to monkey with, just enjoy it and live with it's quirks. Thanks for the vids.

Note: Modern blowers have a 30:1 (overall) reduction on average. So 3600RPM =120RPM rakes.
Your Suzuki sports a 20:1 (overall) reduction. So 3600RPM = 180RPM rakes.

 

[Ziggy65]

Great job on the video.
That is one interesting, weird, heavy duty beast of a machine.
Do you know when these blowers were made? Do you know the history of your machine?
It looks to be in very good cosmetic condition if that is the original paint.

 

[cpchriste]

The collectors market is being flooded!!

COLLECTER ITEM, VINTAGE SUZUKI SR20 SNOWBLOWER | Snowblowers | Edmonton | Kijiji

Very rare vintage Suzuki snow blower, Will need what's needed for a machine that has been sitting for a long time. Does appear to be complete.

www.kijiji.ca

_
COLLECTER ITEM, VINTAGE SUZUKI SR20 SNOWBLOWER
$480
Posted 20 days ago
Edmonton, AB T6A 0P9(View Map)

+7

Description
Very rare vintage Suzuki snow blower, Will need what's needed for a machine that has been sitting for a long time. Does appear to be complete.

 

[bisonp]

That thing is a rolling blizzard! Very cool, thanks for the videos.

 

[cpchriste]

Do you know when these blowers were made? Do you know the history of your machine?
It looks to be in very good cosmetic condition if that is the original paint.

I think these were made early 70s based on the corresponding snowmobile production dates. I would like to know exactly which suzi snowmobile the engine is derived from so I can buy the right replacement parts.
I don't know the blower history. I bought it in MN from a facebook ad posted on this forum. Transportation and rejetting took some time.
That is the original paint except for the chute collar and expansion chamber. I had planned to fully repaint until I realized originality is also a virtue.

 

[cpchriste]

I hoped this machine could replace my YS828t but that doesn't seem likely at this point. I want to try to get the engine governor operating better and want to replace the front cast iron rollers with some large diameter rollerblade wheels to improve the handling. Then we'll see if she stays or if she goes.
I refuse to start a museum here.
I DO want to see what she can do in deep snow - almost 20 HP on 26" width with unlimited front downforce?

 

[HillnGullyRider]

Try and see how far she blows in the 4200-4600 RPM range. Don't give up on it until you can try it out on some frozen plow berms, I bet it's a hoot with those auger speeds. The snowmobile HP rating is likely at full tilt, so figure 40% less divided by 2 for constant run application.