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Posted by Worn Out Retread on October 12, 2009, 11:29 am
>> the HP is really irrelevant. Don't worry about it.
>> I guess that you are only going to look at your machine and not actually
>> do some work with it. Work requires power and knowing what you have IS
>> important.
> Lordy. Unless you are buying pro-grade gear, odds are it is gonna be an
> MTD anyway, no matter what brand name is stuck on it. The same size blower
> will have the same engine across all the house brands. Buy the size you
> need, and move on. Almost always, it will be adequate. The manufacturer
> has no percentage in giving themselves a bad reputation, so they match
> them up pretty well. Don't lose sleep over it- life is too short.
The engines are NOT the same on the snow blowers. Some have Briggs and
Stratton, some are Tecumseh and others are Honda powered. Finding the size
that I need in measurements that I am not familiar with is the problem.
Buying a size that is not up to what I require will inevitably result in the
machine being inadequate for the job at hand.
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Posted by on October 10, 2009, 7:33 pm
On Sat, 10 Oct 2009 09:35:04 -0400, "Worn Out Retread"
>I am looking for a new snow blower and have discovered that the power rating
>of the engines are no longer in "Horse Power" but in "Foot Pounds" if given
>at all. Sometimes all that is given is the CC's of the engine.
>Even the people selling these machines don't know what the "Horse Power"
>ratings are so that old geezers like myself can understand what is going on.
>Does anyone have any general rules regarding the conversion of Foot Pounds
>or CC's to Horse Power?
Foot lbs X rpm /5252 is horsepower. So you need to know the RPM.
The reason they have done this is because several companies were sued
for over-rating the horsepower their engines actually put out.
Like a lawn mower has a 4.5 HP engine (rated at 3600 rpm by the
manufacturer) but because of the blade length and safety regulations
the engine is limited to 2400 RPM on the mower (maximum velocity of
discharge limit). So the 4.5HP engine is now 2.85 HP - but it is STILL
a 6.56 ft lb engine.
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Posted by Tony Hwang on October 10, 2009, 11:04 pm
Worn Out Retread wrote:
> I am looking for a new snow blower and have discovered that the power
> rating of the engines are no longer in "Horse Power" but in "Foot
> Pounds" if given at all. Sometimes all that is given is the CC's of the
> engine.
>
> Even the people selling these machines don't know what the "Horse Power"
> ratings are so that old geezers like myself can understand what is going
> on. Does anyone have any general rules regarding the conversion of Foot
> Pounds or CC's to Horse Power?
>
Hi,
It is all matter of useful HP and useful torque. HP rating is often very
misleading. If Peak HP occurs near top rpm it won't be good. I'd pay
more attention to torque. I still remember what I was told when I was a
kid. Torque is how big a stump an engine can pull, HP is how fast.
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Posted by Worn Out Retread on October 11, 2009, 11:00 am
> Worn Out Retread wrote:
>> I am looking for a new snow blower and have discovered that the power
>> rating of the engines are no longer in "Horse Power" but in "Foot Pounds"
>> if given at all. Sometimes all that is given is the CC's of the engine.
>> Even the people selling these machines don't know what the "Horse Power"
>> ratings are so that old geezers like myself can understand what is going
>> on. Does anyone have any general rules regarding the conversion of Foot
>> Pounds or CC's to Horse Power?
> Hi,
> It is all matter of useful HP and useful torque. HP rating is often very
> misleading. If Peak HP occurs near top rpm it won't be good. I'd pay more
> attention to torque. I still remember what I was told when I was a kid.
> Torque is how big a stump an engine can pull, HP is how fast.
That is the point of the question asked. I want to buy a machine of at least
the same power as the old machine but the system of measurement has changed
so that creates a problem that I have to solve before parting with my money.
--
Ron
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Posted by on October 11, 2009, 3:57 pm
On Sun, 11 Oct 2009 11:00:05 -0400, "Worn Out Retread"
>> Worn Out Retread wrote:
>>> I am looking for a new snow blower and have discovered that the power
>>> rating of the engines are no longer in "Horse Power" but in "Foot Pounds"
>>> if given at all. Sometimes all that is given is the CC's of the engine.
>>> Even the people selling these machines don't know what the "Horse Power"
>>> ratings are so that old geezers like myself can understand what is going
>>> on. Does anyone have any general rules regarding the conversion of Foot
>>> Pounds or CC's to Horse Power?
>> Hi,
>> It is all matter of useful HP and useful torque. HP rating is often very
>> misleading. If Peak HP occurs near top rpm it won't be good. I'd pay more
>> attention to torque. I still remember what I was told when I was a kid.
>> Torque is how big a stump an engine can pull, HP is how fast.
>That is the point of the question asked. I want to buy a machine of at least
>the same power as the old machine but the system of measurement has changed
>so that creates a problem that I have to solve before parting with my money.
You have the tools now.
torqueXrpm/5252=HP
The old engine was rated at 3600 RPM - universally. So your new engine
torque X 3600 /5252 is the rating of old engine that is equivalent.
If it is an OHV engine it will usually have a broader power range, so
will do MORE work than the old side valve equivalent, and on less
fuel.
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>> I guess that you are only going to look at your machine and not actually
>> do some work with it. Work requires power and knowing what you have IS
>> important.