Sneak preview 2: Engineless Toro 521 gets saved - Snowblower Forum : Snow Blower Forums
 
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post #1 of 8 Old 12-28-2019, 04:38 PM Thread Starter
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Sneak preview 2: Engineless Toro 521 gets saved

I took up jackmels' offer of a free Toro 521 that was missing the engine, pulley, belts, and the chute crank worm gear:



As I recently did a Predator 212cc swap on a 1974 Toro 524, I had a spare 5hp Tecumseh H50 with a suitable pulley. I only needed to swap out the extra long oil drain tube(so that it would clear the tall tires) for a shorter one, and I also had to mount a throttle lever on the handlebar.

Picture of donor:



Here's mid-progress pic:



I also installed a spare electric starter while I was at it.

Items that are en route: belts/chute crank worm gear, and skid shoes. I should have it running next weekend.


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Last edited by db130; 01-12-2020 at 01:28 PM.
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post #2 of 8 Old 12-28-2019, 04:57 PM
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Garage



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Make sure the windows are up before the snow plow goes by !!

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post #3 of 8 Old 01-05-2020, 07:15 PM Thread Starter
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New belts, chute crank worm gear, and the skid shoes are on. It runs and drives!

The previous owner of the donor Toro 524 said that the engine would struggle to move heavy snow. I think I know the reason why; while I haven't verified with my sirometer yet, the max rpm seem to be well short of 3600.

If anyone else needs to tweak the high speed RPM on a 1970s medium frame Horizontal Snow King engine, I'm attaching a pic from the 123-page Tecumseh Technician's Handbook.
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Last edited by db130; 01-05-2020 at 08:59 PM.
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post #4 of 8 Old 01-07-2020, 08:09 PM
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I too have a repowered Toro 521 that I installed a Harbor Freight Greyhound 6.5 back about ten years ago.It has worked well with few problems.


Lately,I've noticed that people eagerly recommend the replacement of any Tecumseh 5hp engine with a Predator because of a supposed huge increase in power.


I,myself,have never noticed an increase in power after installing the 6.5hp Greyhound in place of the Tec.HS50.I have noticed that the GH is quieter,more fuel efficient and starts very easily at any temperature,but more powerful-not really.


I recently came across some spec. sheets put out by Tecumseh for various engine models dating from 1974 up though the early 2000's.The horsepower and torque ratings are given for each model.


I noticed something I found interesting.The Tecumseh H,HS50 engines are rated to produce 8 ft.lbs. torque at 2800 RPMs.The Predator 212 is rated for maximum torque of 8.1 ft.lbs. @2500 RPMs.


Honda recently de-rated the GX200 from its former HP output rating of 6.5 down to 5.5 HP.They stated this was a more accurate figure based on new test standards.


I wonder how accurate the 6.5 HP rating for the Predator actually is?I've seen dyno results for highly modified Predators but never any for stock engines.It would be nice to see how close they come to published specs.


EDIT:I just noticed on Harbor Freight's website that the engine specs listed for the 212 are considerably different in the "Predator Beats Honda" comparison chart.There,they have the horsepower listed as 6.1 and the torque output boosted to 9.7 ft.lbs.I raise an eyebrow in suspicion over this.

Last edited by Mike C.; 01-07-2020 at 08:31 PM.
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post #5 of 8 Old 01-08-2020, 06:28 AM
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That H50 is right at home on there db!

I have a '70 H50 and it's one of my more reliable engines (after some TLC of course).


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post #6 of 8 Old 01-08-2020, 12:08 PM Thread Starter
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@classiccat, I've seen your youtube video with your Ariens 524 with the H50.


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post #7 of 8 Old 01-11-2020, 05:01 PM Thread Starter
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Here's the buttoned up picture. I ended up installing a prettier throttle lever (one that actually has stop/slow/fast labels), plugged in a spare harness for the on/off key, and threw on a new Toro friction disc.

The H50 runs well and it should be a good match for the frame.



The only other thing I might change is to use a 90-degree elbow for the oil drain tube and go back to using the original longer tube so that it runs to the back of the blower.


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Last edited by db130; 01-11-2020 at 05:04 PM.
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post #8 of 8 Old 01-11-2020, 06:39 PM
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I rate the 212 Predator right up there with power against the 8 hp 318 cc Tec.......
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