Replacement Engine Compatibility Question - Snowblower Forum : Snow Blower Forums
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post #1 of 16 Old 01-20-2020, 09:54 PM Thread Starter
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Replacement Engine Compatibility Question

Getting ready to pull the blown engine on the Ariens Compact 24 pulled from the trash a couple weeks ago. Factory engine is a Briggs And Stratton 205cc Polar Force (B&S Model# 12D134-0138-E8) with 3/4 dia. crankshaft, 2-27/64 (2.422") length measured from oil seal, and tapped at 5/16-24.

My question is whether I need to find a replacement engine with the exact same 2-27/64 (2.422") length measurement from the oil seal to ensure proper alignment when swapping over the stock pulleys?

Narrowed my replacement engine down to 3 options:

Option 1. Harbor Freight Predator 212cc with 3/4" x 2.43" length crankshaft. For $99 out-the-door tough deal to pass up.

Option 2. LCT 254cc Storm Force Engine with electric start, and 60w AC Alternator. 3/4" crankshaft x 2.44" length crankshaft. Only thing I don't like about this engine is the lack of an adjustable throttle control lever. It's a fixed speed engine. Cost is $180 delivered.

Option 3. Briggs & Stratton 250cc 1150 Snow Series engine with electric start, 60w AC Alternator, and adjustable throttle control. It's lacking a fuel shut off valve, but that's easily rectified. 3/4" crankshaft x 2.312" length crankshaft. Cost is $194 delivered.

Leaning toward option 3 (Briggs & Stratton 250cc 1150 Snow Series) but I'm concerned about the pulley alignment since the stock crankshaft is 2.42" from the oil seal and the B&S is only 2.31" from the oil seal. Thinking the shorter length (0.11") of the B&S crankshaft might cause alignment issued when lining up the pulleys for the auger and drive belts.

Just looking for insight and guidance relative to the crankshaft length and impact on aligning pulleys. In advance, thanks for your input!

2009 Honda HS928WAS
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post #2 of 16 Old 01-21-2020, 05:32 AM
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I've not used the harbor freight engines on anything but lots of guys here have used them with good results.I'm slowly being won over to them. If I need to replace an engine I'd probably go with the HF engine. JMHO

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post #3 of 16 Old 01-21-2020, 07:56 AM
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Like Joe's post, I'm not personally familiar with the HF engine but I've heard only good things about them for both snow blowers and mowers. I know HF provides a 2-year warranty which is nice although I don't know what's involved.
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post #4 of 16 Old 01-21-2020, 08:26 AM
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I have the Predator 212 on my 10ML6D for years now, works just great. Better than the original, and even better than a new B&S on my 10M4, which works great also.
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post #5 of 16 Old 01-21-2020, 08:54 AM Thread Starter
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Thanks guys. No doubt the Predator gets "best bang for the buck award" but the other two engines offer a few more advantages for slightly more money. 1) The LCT and B&S engines are built as "Snow Engines" with carb jetting set-up for cold weather and come complete with fully enclosed heater boxes to prevent possible freezing on the linkage mechanisms. 2) The LCT engine has 254cc and the B&S engine has 250cc compared to the 212cc of the Predator. 3) The LCT and B&S both have 110v electric start which probably isn't needed however certainly makes the machine more "appealing" when I go to flip it. 4) The LCT and B&S both have 60w alternators to power the headlight already on the machine.

Putting all those feature and benefits aside, my question is whether I will run into any pulley alignment issues if the stock size crankshaft length is 2.422" and I want to use a replacement engine with a crankshaft length of 2.31"? Will that shorter crankshaft length of 0.11" cause any belt alignment issues or can a use a spacer or washer to make up the difference? Thanks!

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2005 Honda HS520AS
1996 Honda HS621AS
2012 Toro 1800 Power-Curve

Last edited by Freezn; 01-21-2020 at 09:07 AM.
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post #6 of 16 Old 01-21-2020, 09:03 AM
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Engine was a direct fit replacement. Predator runs just fine in cold weather, never had any issue of any "freeze up" as you mention. No need for a starter, as it is the easiest pull start I have ever seen on an engine. Even though it is only 212cc, it runs like an 8hp, plenty of power for a 24 inch blower. I have 7 blowers, and I never in my life had a light on any blower, as I never found a need to have one.

It is up to you if you want to spent 3x the amount for an engine or more, but totally a waste in my opinion.
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post #7 of 16 Old 01-21-2020, 09:31 AM
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The space from the engine is the important part for alignment, if the shaft is slightly longer or shorter can be fixed with a spacer as you mentioned.

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post #8 of 16 Old 01-21-2020, 10:15 AM
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If money is not an issue I’d go LCT, if it is I’d go predator


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post #9 of 16 Old 01-21-2020, 06:17 PM
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Quote:
Originally Posted by Freezn View Post
Option 2. LCT 254cc Storm Force Engine with electric start, and 60w AC Alternator. 3/4" crankshaft x 2.44" length crankshaft. Only thing I don't like about this engine is the lack of an adjustable throttle control lever. It's a fixed speed engine. Cost is $180 delivered.

Option 3. Briggs & Stratton 250cc 1150 Snow Series engine with electric start, 60w AC Alternator, and adjustable throttle control. It's lacking a fuel shut off valve, but that's easily rectified. 3/4" crankshaft x 2.312" length crankshaft. Cost is $194 delivered.
Since it's your money and since I like to live vicariously through other people, I too would like to see #2 or #3 (been there, done that with the Predator 212) on your snowblower

As mentioned in your other thread, you can buy a carburetor with throttle control + throttle knob for that LCT 254cc engine... but by the time you add up the cost of the extra parts for the LCT, it ends up being about the same as option #3 + $5 fuel shutoff valve.

You should be able to account for the difference in crankshaft length by using spacers, as shown here by @Sblg43:

https://youtu.be/bj2455iOs88?list=PL...sLsEKnuA&t=107


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Last edited by db130; 01-21-2020 at 06:59 PM.
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post #10 of 16 Old 01-21-2020, 10:18 PM
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I vote for the Briggs.
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