Heart Transplant for 10-33 Mastercraft 1978 - Snowblower Forum : Snow Blower Forums
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post #1 of 21 Old 01-15-2016, 11:48 AM Thread Starter
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Heart Transplant for 10-33 Mastercraft 1978

Well, I survived the winter of 2015 with a not so forgiving 10hp Tecumseh Snowking engine Circa 1978.

I had major problems with the carb so I changed it for a Chinese copy and it was worse.
I rebuilt the old one and it was a little better.
I shaved the exhaust valve to spec and it still ran bad. (hunting and backfiring)

Too much time invested in that old POS.

So......The upgrade is a 15hp Princessauto electric start engine. It was on sale for $299.00 CDN.

Couldn't pass it up. 420cc-ohv-gas-engine-with-electric-start

I had to modify the mounts and the shorten the dual pulley assembly to align with the main drive and auger pulleys.

Update:
Added a LED light but that burnt out in 3..2..1... My fault I should have read the LED conversion thread. (New one received and awaiting the parts to build the rectifier circuit)

First real test after the 40cm dumping on the 28th of DEC 2015:

1. Starts on first pull (using Hi-test gas w/o methanol to save the rubber parts)
2. Plows through the snow with a new 15hp powerplant
3. Throws the snow 20-25% farther


I'm satisfied

KUDOS to princessauto.ca for their excellent support of the products used in the conversion.
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post #2 of 21 Old 01-15-2016, 02:29 PM
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Garage
Looks like factory, great job. I like the oil drain

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

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post #3 of 21 Old 01-15-2016, 02:41 PM
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Sweet job with an extra 5 horse over the Tec.

Lee

John Deere TRS32
Craftsman 1032 Drift Breaker
John Deere 1032
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John Deere 1032 Project
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post #4 of 21 Old 01-15-2016, 05:59 PM
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Looks very nice.
You need to change the 10-33 to 15-33 though....
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post #5 of 21 Old 01-15-2016, 06:06 PM
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A) you get 10" snow and temps steadily dropping
B) you now start on one pull- verses numerous pulls and issues before
C) you are done in 15minutes-verses trying for 15 minutes to get older one running right.
D) good choice- good workmanship-good job
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post #6 of 21 Old 01-16-2016, 02:52 AM
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Quote:
Originally Posted by motorheadsdiygarage View Post
Well, I survived the winter of 2015 with a not so forgiving 10hp Tecumseh Snowking engine Circa 1978.

I had major problems with the carb so I changed it for a Chinese copy and it was worse.
I rebuilt the old one and it was a little better.
I shaved the exhaust valve to spec and it still ran bad. (hunting and backfiring)

Too much time invested in that old POS.

So......The upgrade is a 15hp Princessauto electric start engine. It was on sale for $299.00 CDN.

Couldn't pass it up. 420cc-ohv-gas-engine-with-electric-start

I had to modify the mounts and the shorten the dual pulley assembly to align with the main drive and auger pulleys.

Update:
Added a LED light but that burnt out in 3..2..1... My fault I should have read the LED conversion thread. (New one received and awaiting the parts to build the rectifier circuit)

First real test after the 40cm dumping on the 28th of DEC 2015:

1. Starts on first pull (using Hi-test gas w/o methanol to save the rubber parts)
2. Plows through the snow with a new 15hp powerplant
3. Throws the snow 20-25% farther


I'm satisfied

KUDOS to princessauto.ca for their excellent support of the products used in the conversion.
Make a video of it throwing some snow! I love seeing snow flying 50+ feet.
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post #7 of 21 Old 01-18-2016, 01:07 PM
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How did the new one compare to the TEC in terms of mounting bolt location, size, weight and machine balance? I'd love to go even further overboard.

'77 Ariens 924032 "Brick House" Re-Powered with a TEC 10HP and oversize auger pulley
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post #8 of 21 Old 01-18-2016, 01:35 PM
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Quote:
Originally Posted by nt40lanman View Post
How did the new one compare to the TEC in terms of mounting bolt location, size, weight and machine balance? I'd love to go even further overboard.
I have the same engine repower and just the torque of close to 20 ft/pd vs
15ft/pd on the previous 11 hp O358cc Tec I had before speaks volume to its nonchalant operation with higher volumes of snow thrown.
In terms of mounting bolts pattern the 420cc is approx. 1/2" wider and roughly the same lengthwise by memory and the new engine weighs 86 lbs vs 55 lbs for the Tec. mind you to comment on the balance it largely depends much on where it is sitting via the axle if fore or aft.
So long story short it differs with which snow blower brands.

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
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post #9 of 21 Old 01-30-2016, 01:11 PM Thread Starter
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Quote:
Originally Posted by nt40lanman View Post
How did the new one compare to the TEC in terms of mounting bolt location, size, weight and machine balance? I'd love to go even further overboard.
1. Easier to start than the TEC and quieter.
2. Mounting bolt location is slightly different and the diameter of the bolts used are larger.
3. The 15hp engine is slightly larger and heavier.
4. No balance problem as it sits in the exact same place over the wheels.
5. More torque at lower rpm and throws the snow 10-15 ft farther.


I'm happy with the conversion!


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post #10 of 21 Old 01-30-2016, 01:38 PM Thread Starter
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Led conversion

I've been working on a LED conversion for this snowblower and this is what I came up with on the cheap. Info from the LED conversion posts on this forum were helpful to understand the principles of dirty vs clean rectified DC voltage.

So far this lesson cost me one LED work light.
4-7/8 in. 55W LED Flood Light | Princess Auto

My engine produces 24-29 VAC and the LED needed 12 VDC at 0.15 amps max.

I salvaged the full wave rectifier from a 350 WATT ATX computer power supply I had laying around.

Parts list as follows:
1ea. Full Wave rectifier PBL405 (5amp) (salvage)

2ea. 2200uf/35VDC Electrolytic Capacitors (amazon.ca)

1ea. 96 Ohm 2 Watt Wirewound Resistor (my junk)

1ea. Waterproof Plastic Electric Project Case Junction Box 60x36x25mm (ebay)
5X Waterproof Plastic Electric Project Case Junction BOX 60mmx36mmx25mm | eBay

1ea. Orange Heavy Duty SPST 4 Terminal ON/OFF Toggle Switch Waterproof Cap Boot (ebay)
Orange Heavy Duty SPST 4 Terminal ON OFF Toggle Switch Waterproof CAP Boot FHRG | eBay

Wire from the old power supply.

Testing to follow!!!!!!


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Last edited by motorheadsdiygarage; 02-21-2016 at 05:14 PM.
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