Ariens Upgrade Horsepower on 9HP - Snowblower Forum : Snow Blower Forums
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post #1 of 15 Old 01-05-2020, 09:43 AM Thread Starter
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Ariens Upgrade Horsepower on 9HP

Hi all, quick question that has me baffled so I figure maybe some of the experts can give me some advice

I have an older 1998 Ariens model 924122 powered by an SnowKing OHSK110 11hp and also have a newer 926004 powered by a SnowKing OH318SA 9hp
They both say 318cc, and from what I can tell they are identical -and figured maybe it's the carb that is different and has bigger jets but they both come back to the same Carb part #
(See attachments of pics I took from each motor that show the same displacement)

So, instead of swapping the 11HP motor to the newer 926004, how can I bump up the power of the 9hp and make it produce 11HP? Any help would be appreciated, I'm a little baffled by the same displacement and carb, yet 2HP difference. I want more power out of that 9HP and think it can be done, but how?


Thanks!
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post #2 of 15 Old 01-05-2020, 10:27 AM
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What are the spec’d rpms for each engine?

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post #3 of 15 Old 01-05-2020, 10:30 AM
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Some companies got in trouble for claiming wrong cc on some engines, 280cc is around 8hp. I have a Husqvarna with a 291cc eng which is around 9hp.


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post #4 of 15 Old 01-05-2020, 10:30 AM
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I am by no means an engine guru, or to be all knowledgeable on the output performance of an engines bore or compression specs, etc, etc...

I do, however, know the HP of an engine was somewhat flawed in many manufacturers claims. Thus, the removal of HP ratings on engines, and now the cc ratings being displayed. In my own humble opinion, even modifications, settings, etc., on identical short block displacements, power output can be manipulated.

… all a game really for manufacturers in MHO.
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post #5 of 15 Old 01-05-2020, 10:39 AM
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First post needs a Bloody Mary welcome...Greetings from Penciltucky!!

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post #6 of 15 Old 01-05-2020, 10:42 AM
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If you want to stay with Tecumseh, find a 358 cc ....I believe the 10 flattie was the big bore...of course a 414cc or 420cc Chonda will make it spin! The hp ratings are bogus on the Tec's, like you discovered. Heck the 8 hp.is 318cc
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post #7 of 15 Old 01-05-2020, 10:55 AM
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The 9np and the11 hp 318cc are the same has 16.2 lb ft torq has more power then 358 flattie
its a real 10 hp those that paid for 11 got smoked those that paid for 9hp did well
its a good motor
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post #8 of 15 Old 01-05-2020, 11:01 AM
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1132, are those OHV engines? I've got a 10 hp OHV and an 11OHV that I pulled off of Toros...identical?
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post #9 of 15 Old 01-05-2020, 11:11 AM
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Quote:
Originally Posted by cranman View Post
1132, are those OHV engines? I've got a 10 hp OHV and an 11OHV that I pulled off of Toros...identical?

Yup ohv 318 cc is real 10.1 ish hp ohv 358cc is real 11.1 ish hp


Flsttie 318cc is a real 7.5 ish hp flattie 358cc is a real 9.59 ish hp
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post #10 of 15 Old 01-05-2020, 11:42 AM
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to SBF tzoeric

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