Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have a 2010 Platinum 24.  I only seem to use it for EOD duty and the occasional heavy storm.  I use my singe-stage for everything else.  Could I optimize my Ariens by removing the stock 250cc Polar Force engine and bolting on a bigger engine...let's say a 342cc or something similar?  Is there a bigger Briggs (Polar force, Intek, etc.) that would mount on that frame and accomplish my objective without too much modification?  The stock engine is ok, but if my goal is to cut down the EOD pile and be able to throw it across the street would the big motor/24" bucket combo get me there?  I don't care about the warranty.  Can anyone recommend a specific engine for this project and the associated parts (pulleys, belts,etc.) that might be required?  And of course some extra shear pins! 

I found a 2 groove pulley that's 3.35" od x 1" shaft here:  http://www.grainger.com/Grainger/VBelt-Pulley-3X520?BaseItem=3X520 

I estimate that it should take the 14" dia impeller speed from 1010 rpm (factory) to about 1340 rpm. There's also a 3.95" dia. available, but that might be too much (1577 impeller rpm).

 I will have to bend the belt finger to try to make it fit. Are you saying that these 2 groove pulleys will not position the belts properly to line up with the impeller shaft pulleys?  Will  this increase in impeller speed on a 14" impeller make much of a difference (+330 rpm)?  The extra hp from the 342cc motor should handle this extra load, no?

Well, changing the 2 groove auger drive pulley on the engine shaft is a no-go.  Ariens uses a custom made part that extends the pulleys past the end of the shaft by a couple of inches.  So, the other alternative is to reduce the size of the 2 groove pulley that goes on the impeller shaft.  The stock part is 8.5" diameter with a 1.65" center hole and 3 bolt pattern that mounts the hub.  Does anyone know of a similar pulley that  measures between 6 to7" in diameter or am I dead in the water again?

 

slinger wrote:
That pulley looks a lot like and automotive pulley.  You might try a junk yard. Maybe you could get lucky and find one with the OD your looking for.  The center hub hole will probably not match yours.
But a competent machine shop or do it yourselfer could get your hub mounted.  The offset could also be an issue but possibly resolved with shims / washers on the hub. I'm sure it's do-able if you can
find one with the right diameter.

Strange that they would allow the pulley to sit out 2" past the end of the shaft which is probably 2 7/8" long as this will put a lot of stress on the main engine shaft bearing.  One option you have is to have a piece of 1" dia stock center drilled for the correct size hole so you can bolt the crankshaft extension to the original shaft and effectively extending the crankshaft 2"  i would suggest using a grade 8 bolt of the correct thread and size to attach it with.  Any machine shop can easily center drill the shaft on a milling machine. I suspect this would be easier than trying to find the correct size lower pulley with the correct offset.

Carl

Yes, the accessory drive pulley on the engine shaft is a unique design.  It is keyed and slides on the shaft easily.  All pulleys (this one and the drive pulley below it) are held in place on the engine shaft by a 3/8" x 2" long bolt in the end of the shaft.

you could have the machine shop  drill and key a larger piece of stock to go over the existing crankshaft end and then have it turned down to 1" to accept standard pulleys further out but that might get a little expensive.  That appears to be a very short crankshaft end sticking out of the engine

carlb:  The engine driveshaft is actually 2 7/8" long just as you thought.  The drive pulley is still on the shaft in the picture.  It probably looks shorter because it's cold in the garage!

slinger wrote:
If you go up to something like a 342cc (11hp) from a 250cc (8hp).  Your probably getting into a different block size.  Eight and ten horse blocks are usually the same.  11 & 13 horse are usually the same but
larger than the eight and ten. It's that way with Honda's so I'm assuming it's that way with Briggs.  If it is, then the engine mount bolts holes will be different.  The crankshaft vertical center line
will be higher and the engine will probably have to be moved back on the blower.  The belt cover may also not fit because of the higher crankshaft.  Not trying to discourage you, just pointing out
some other things that may be involved in re-powering your blower. 

Another modification that you might consider.  Check to see how much clearance you have between the tips of the impeller
blades and the impeller housing. If it's more than a 1/8" say 1/4 to 5/16".  Buying an impeller kit or extending the blades by adding on weld. Will give you a noticeable improvement in throwing
distance. And the blowers ability to throw really wet almost slushy snow.  Having said that, improving the impellers efficiency will also put a bigger load on the engine.
But you could then upgrade from the 8hp to a 10hp (instead of an 11hp) to pick up some additional power.  And staying with the same block size would eliminate the problems of going up a block size.
Assuming the eight and ten horse Briggs engines share the same block size.  Just some thoughts.
 I re-powered my Ariens 1032 with an 11hp Honda clone (and have now put a 13hp Honda on it)
Increased the the blower drive pulley from 2 3/4" to 3 1/4".  And decreased the impeller blade clearance to 1/16+
Here is a video of the throwing distances it has now.  Most of the snow was dense over plow and had been sitting for days. It's great fun to use!
Doing the same modifications on a blower with a 24" bucket instead if a 32" bucket.  And you would have no trouble throwing across the street.
Blower video

I really enjoy watching that video.  That modified Ariens is a beast.  Have you noticed significant difference with the 13 hp Honda clone engine?