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

Yep..........

Check out this blower in action and the other Hemi-powered inventions.

What I want to know is...what is the recommended sustained RPM in that application? What is the recommended oil change interval and recommended oil? Is that a single stage or two-stage...and where can I get one?

ooooo, nice.  Just raise the RPM and that should work in any application. 

Now those are cool!

That thing sure sounded like it was pushing much more than 2500 RPM's.

The Snowblower needs to operate like those commercial walkbehind mowers that have the attachment that allows you to stand on it. They're like a zero turn.

Then they would have to add on a speedometer.

                                                                                             Dan

You mean one of these


Now if a HEMI would fit....hmmmmm!!!!

For those of us who are ignorant, could someone please define what a hemi is and does.

Thanks

The word HEMI is actually short for hemispherical. In a piston engine, the area from the top of the piston to the top of the cylinder head by the valve heads is known as the combustion chamber (this is actually just an area of air!). The combustion chamber on most overhead valved AUTOMOTIVE engines are either wedge shaped (think of a piece of pie) or hemispherical (think of tennis ball cut in half). The cylinder head design dictates the combustion area shape, so when someone says "hemi", it really only refers to the engine's cylinder head having a hemispherically shaped combustion chamber.

Hemi heads have the spark plug located at dead center of the combustion chamber, which makes for an extremely efficient & powerful fuel/air mixing & flame burn (actual igniting of the fuel/air). Hemi heads also have ideal valve placement to help the flow of air (intake & exhaust) through the cylinder head. In simple terms, the head design is VERY efficient, and allows an engine to make excellent power! On the downside, hemi heads themselves usually are quite heavy & large, and valvetrains can be somewhat complex (read: expensive).

Wedge shaped combustion chambers are what most OPE engines have, as do most automotive engines. The "wedge" shape by design, is not as efficient as a "hemi" due to all the sharp angles that are present, which creates turbulance. The valve placement & spark plug location are less than ideal also. Cost was a big factor that lead to the wedge design. However, a wedge chamber CAN be modified to produce very impressive burn & airflow rates - having said that, IMHO all this "HEMI" talk (car & truck commercials) as of late really doesn't impress me personally. Chrysler/Daimler is really getting a lot of hype & sales out of it though...

There is another variation of head called a semi-hemi, but it is not widely used. It is actually a cross between a wedge & hemi shaped combustion chambers.

Marty

Bruce Willis has a vintage bike w/ a semi, hemi, Demi, in it. (Rim Shot)

This one doesn't but it's got a 454....



Item #7701609184 on eBay.

Bill_D wrote:
ROFL


Garandman, that thing is awsome. With open headers, I'm sure it gets the neighbors attention.