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Subject Author Date
Belted Motors Bob_Loblaw 02-19-2007
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Posted by Bob_Loblaw on February 19, 2007, 9:28 am
What is the effect on the cfm when you downsize a residential blower belt.
Does it increase or decrease it?
At 2:00 AM, I had to use a 41 inch belt to replace a 42.
The amp draw was right on, and the tension bar was fully extended with the
42", which leads me to beleive it was originally a 41.



--
Respectfully, Bob

Posted by on February 19, 2007, 9:35 am
On Mon, 19 Feb 2007 14:28:09 GMT, "Bob_Loblaw"

>What is the effect on the cfm when you downsize a residential blower belt.
>Does it increase or decrease it?

        Neither.


>At 2:00 AM, I had to use a 41 inch belt to replace a 42.
>The amp draw was right on, and the tension bar was fully extended with the
>42", which leads me to beleive it was originally a 41.
>

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Posted by Steve Scott on February 19, 2007, 10:15 am
The only change in cfm occurs when you change a pulley size or motor
rpm.

On Mon, 19 Feb 2007 14:28:09 GMT, "Bob_Loblaw"

>What is the effect on the cfm when you downsize a residential blower belt.
>Does it increase or decrease it?
>At 2:00 AM, I had to use a 41 inch belt to replace a 42.
>The amp draw was right on, and the tension bar was fully extended with the
>42", which leads me to beleive it was originally a 41.
>


--
One should not act and speak as if one
were asleep.





Posted by on February 19, 2007, 11:48 am

>What is the effect on the cfm when you downsize a residential blower belt.
>Does it increase or decrease it?
>At 2:00 AM, I had to use a 41 inch belt to replace a 42.
>The amp draw was right on, and the tension bar was fully extended with the
>42", which leads me to beleive it was originally a 41.
>

length of belt has nuthin to do with rpm & cfm. changing pulley size
does.

Posted by Bob_Loblaw on February 19, 2007, 10:39 pm
gofish@gonefishin.net wrote



> length of belt has nuthin to do with rpm & cfm. changing pulley size
> does.


I couldn't envision WHY the pulleys would react differently to varying
lengths, but I wasn't sure.
I thought I remembered something from long ago about it altering rpm in
some way, but couldn't figure how it would.
Thanks guys!
OK, NOW I think it's safe to say that I know everything.... :-)


--
Respectfully, Bob

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