B&S V-Twin Engine Swap - Snowblower Forum : Snow Blower Forums
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post #1 of 26 Old 04-27-2011, 12:26 PM Thread Starter
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B&S V-Twin Engine Swap

I have had snow blowers for many years, but last summer I finally got around to moving up to a two stage. I purchased this fine 26” two stage on a 100 degree day which made the unit cheep. When I got it I had a broken rear axle which was an easy fix since it is just a piece of 3/4 shaft.

This is what she looked like when I got the shaft fixed.




She made it through the winter okay, but is appears the engine had seen her better days. When I serviced her before the winter started the engine oil was really black and was black again almost as soon as I put new in. The air filter was also completely missing. Both good signs of course. Due to the lack of power, I decided the right thing to do was find a bigger engine and here is where the fun starts.

A note before you beat me up to bad: I spent no time trying to make the build look good. My plan is to figure out if everything works the way I want it to, tear it down next summer, make everything look nice and then paint it. I am thinking flat black and red on the spout and auger.


Finding the Engine and the output shaft:
I researched all the normal options on harbor freight, but that didn’t seem very creative and was a little more money than I wanted to spend. So one day on Craigslist I found a guy selling a B&S 14hp V-Twin that had come off a generator which had about 100 hours on it. I picked the B&S up for $210 which seemed okay to me. I had talked to a few people and they all assured me that I could find a pulley to fit on the tapper shaft that the engine had. It only took me about 4 hours to confirm in my mind that this type of pulley actually doesn’t exist. The 4 hours of course came after I had purchased the engine so I was kind of in a tough place. I did some checking with a few buddies that had access to machining tools and they all said it would be around $100 to turn the shaft if I took the crank out of the engine and brought it to them.

Fixing the shaft:
Spending $100 and having to take the engine apart wasn’t sitting right with me so I came up with plan #2. I bolted the B&S down to my work bench. When I first tried to get it started it of course won’t start. I then mounted a fuel tank above the carb and by passed the fuel pump. Then it started right up. I semi remember the guy that I purchased the engine from telling me that the full pumps die from time to time. Hmmm. Anyway, I now had it bolted down and running. The next thing to do was to grind down the shaft to fit the pulley I had purchased. It took me about three hours, but I got the shaft ground down to a 1” diameter. Basically I would start up the engine and let it idle. Then I would grind for a few seconds to a minute with my hand grinder and then shut it off to see if I had it milled down to what size I needed. It was a very time consuming processes and I went really slow as I didn’t want to mess up the shaft. I then cut a keyway into the shaft with an air cut off tool. I can hear everyone reading this laughing at me right now, but I took a video of it running and played it back frame by frame and the pulley runs smooth. The guys with the machining tools also couldn’t believe it worked. The best part was that they all said that they would have done the work for $25 and we could have left the crank in the engine. I just love people that change their story.










New pulley:
I used a 3.15” diameter pulley. The original pulley was 2.5”. I figured that I should be able to turn everything a little faster since I have extra horsepower.

Disassembly:
The next step was taking the old engine off. That of course only took about 5 minutes. I also took off the top of the shoot and the crank that turned the shoot. I should have ran the base down to the car wash, but I was a little too excited at this point to do anything but work on mounting the engine.




Positioning the Engine:
This was likely the part that was the least amount of fun. The old belt was too short and it took four trips to NAPA to get the right one. They were very helpful as usual and also directed me to get a wider “A” belt. Once I finally got the belt that was the closest fit, I determine I would need to space the engine up a little. I used a ½ piece of square tube to space it up. The other concern with the mounting was getting the crank that turned the shoot past the exhaust and oil filter. I ended up mounting the engine quite a ways towards the right of the base. The next thing to do was add six inches of pipe to the spout so I could get the shoot high enough up so I could mount the turn table. My dad grabbed me some old water pipe. Not the best pipe in the world, but it should handle this job without an issue. I also had to do some minor fabrication on the mounting hardware for the turn table crank. At this point I bolted down the engine solid to the base. It took a few tries to get it perfect, but that was semi-expected.




Fuel Tank:
I did some research and it appears that a 14hp B&S will drink about a gallon of gas an hour. So I figured I had better find at least a one gallon tank. The first tank I found had been outside for years and was a rusty mess (the round one in the pictures). I ended up pitching it in the trash, but used part of its mounting bracket to build the mount for the second fuel tank. I used some cargo straps since most of my random metal is in storage at the moment. I also installed a fuel filter and a fuel shut off between the tank and the engine.

Throttle:
The next project was to build the throttle linkage. Since the engine came off a generator there weren’t mounts for the cable. I used a piece of angle iron to build the mount. B&S was nice enough to put an 3/8” tapped hole on the back of the engine that I was able to bolt the angle iron to. I robbed a throttle cable from a dead riding mower. The throttle came out a lot better than expected.




Tires and Tire Chains:
I don’t like my tires at all, but I haven’t figured out what to do yet. I took the chains off as they were lifting the front of the blower off the ground when one of the chain links hit the ground. The tires are about 10” tall and 3” wide. I am thinking of about finding some different rims and tires which will take some time. Any thoughts here would be helpful.

Shields:
Last, but one of the most important things was getting all the safety shields reinstalled. I had to modify the one that goes over the pulley and belts a little due to the pulley being bigger and the shaft being positioned higher off the base. I didn’t install the shield on the other side as the oil filter makes it next to impossible to come in contact with the belt.

The weak leak:
As I mentions before, the axle was broken when I purchased the unit. It had been replaced before as the one that I removed looked like it had been installed by a 3 year old. It had broke where the bolt goes through the shaft to connect the sprocket. My guess is that is only a matter of time till it breaks again. Any ideas of what I can do here. The axle is just a boring old piece of ¾” stock.

And that is my snow blower engine swap. Thoughts?




Here is a video of her running:
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post #2 of 26 Old 04-27-2011, 12:41 PM
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Looks and sounds great.

One problem -- No snow!

I see tires and rims on ebay a lot. Check the snowblower section.
tire | eBay
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post #3 of 26 Old 04-28-2011, 07:15 AM
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Shoould be quite the snow throwing monster!
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post #4 of 26 Old 04-29-2011, 12:47 AM Thread Starter
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I *think* i found some rims locally. Hopefully the guy will email me back. I would like to at least have the rims in case my crappy hold rubber tires are as bad as i think they will be.
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post #5 of 26 Old 04-29-2011, 05:53 AM
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Great! It's guys like you that make me look sane! I just picked up a 10 hp tecumseh in buffalo....it had my 5th snowblower attached to it. Can't wait to see yours in action.
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post #6 of 26 Old 05-02-2011, 12:57 PM
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Exellent engine upgrade, grupe! Lookin' good!

Wayne

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post #7 of 26 Old 05-24-2011, 04:14 PM
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Axel

Just saw this today, very interesting project. Reminds me of one on YouTube where the guy did something similar to a John Deere IIRC.

On the axel, I don't know what yours looks like so here's something you might want to research. Older Craftsman blowers by Murray have 3/4" axels with welded on sprockets. There's 2 different diameter sprockets for sure, I know because I have 5 of them right now. These are the ones that model numbers start with 536 IIRC. I don't know if they'll work or not, but might be worth a look.

Paul
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post #8 of 26 Old 05-25-2011, 02:22 PM
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Where did you get the drive pulley?
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post #9 of 26 Old 05-27-2011, 02:49 PM Thread Starter
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Paul - Thanks for the input. I will keep my eyes open.

Captainconsumer - Pulley came from Surplus Center - Hydraulics, Engines, Electrical and More They had the best prices that I could find in the size I needed. I am sure you could do better, but I got tired of looking after a while. The only think i didn't like about them is that they are in NE so i had to pay taxes. Grrrr.

I am headed back home this weekend. My buddy has a graveyard of ridding lawn mowers and i am hoping to find a pair of rims.
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post #10 of 26 Old 06-09-2011, 11:30 AM
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Grupe,

Isn't doing this stuff loads of fun? I repowered an older Snapper Lawnmower that meant all kinds of modifications were required. I did this over the course of the winter and it looks and runs as new. (actually better with 2 more HP!)

The best part of your mod is that a V-twin is so much smoother and quieter, beside being way more powerful.

Do a good job on your paint work and look for a deal on a set of large Snow Hog wheels and tires.....it will look mean!

Great job,

QuickRick
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