Larry Cobb
Member
Gear diameter has nothing to do with power differences.
Gear diameter determines the MAX power thru the blower.
If the #47 moves more CFM . . .
then the #45 will absolutely . . .
have more lift.
Larry
Gear diameter has nothing to do with power differences.
Actually, Silencer & plumbing back pressure should also be subtracted from the max vac levels.
Oh...I see...the graphs are old. Can you upload your current Sutorbilt factory data.
So we can assume you accounted for all these factors? Exact same truckmount just different blowers?
any chance a Nerf football was stuck in the vacuum relief valve on the 47 unit?
jay finally thank you for amsweromg ,y question. I have also heard someone on here say several times that they believe the 45 blower unit is the perfect single wand machineJon, heres a answer to your question. your 47 running at max rpms is better for dual wanding large commercial jobs and can do residential too. The 2545 for employees single wanding apartments, businesses and houses will be a great machine for the intended purpose. I have had a 3047 machine and being a 1 man company I only used it to dual wand a couple times and it worked fine for that but was more than I needed. I sold it and I bought a 2045 machine and it ended up being a great single wand machine for me. The major difference is the CFM between the 2 blowers when the wand is off the carpet. The 47 won on that account. But with the wand on the carpet the cfm is a mute point and hg/lift is the king to get carpet dry. You will not lose any quality of work by going with the 45 machine. Single wanding the 45 will be just fine, If your looking for a dual wand machine then another like you already have is the way to go. The 25hp kohler will also burn less gas than the 34hp kohler. my 30 would burn about 2 gallons a hour vs 1.4 gallons on the 20hp. hope i didnt muddy the water too much for you.
45's are 2 1/2" and 47's are 3"
if someone were smart...
they'd buy brents 47 and let
me build a nice shaft drive around it..........
Here is the Sutorbilt factory data:
http://www.airmac.com/pdfs/bv_gd_sutorbilt2.pdf#page=9&zoom=125,0,676
Max. for 4LR (#47) is 14"
Max. for 4MR (#45) is 16"
Larry
It's not debated that the narrower blowers in each size group can be set at a higher lift. However if lift alone were the goal our industry would use vane pumps to run at 22Hg or so.
We don't.
Thanks for the graph Larry. Can you explain why these numbers would seem to contradict your results?
I have also heard someone on here say several times that they believe the 45 blower unit is the perfect single wand machine
I'm one of 'em
Not that a 47 doesn't have plenty virtue single wanding as well
It allows slower RPM (less noise) and same performance
as I mentioned in the post above, no manufactures I know of run 47's near their capacity.
2600 is about tops from what I've seen , where many (most?) of the 45's are cranking 3000+
..L.T.A.
On my ** truckmount it I run mine at like 3400.
I'm one of 'em
Not that a 47 doesn't have plenty virtue single wanding as well
It allows slower RPM (less noise) and same performance
as I mentioned in the post above, no manufactures I know of run 47's near their capacity.
2600 is about tops from what I've seen , where many (most?) of the 45's are cranking 3000+
..L.T.A.
This Larry can
It's simply because no one runs their 47 blower at 3600rmp.
Most run 47 in the 1800-2600max rmp
and in poor Chris's case who has been brainwashed by Bob (Bobwashed) , his 47 is only spinning at 1600 rpm
..L.T.A.
If you set a machine at 15 inches you are going to get 15 inches . Having said that here is what i discovered at my BBQ then at Duanes place in Atlanta. a machine with a 36 or 45 blower set at 15 hg at the machine will get at 100 feet at the carpet 12 inches of lift .
a 47 ,56,59,68 blower set at 15 inches of lift at the machine will get 14.5 to 14.9 inches of lift at the carpet.
Not an answer to your original question Jon, however....
Most companies that have employees, choose a PTO for their simplicity to operate. Also their employees much prefer the pto's. These days you can get them with both plenty of heat and suction.
Did you consider going that way?
PTO's with electric clutches . . .
are limited by the power capabilities of the electic clutches. (usually ~12-15 HP depending on RPM)
These cannot drive #45 & #47 to their full operating capabilities.
Shaft drive PTO's are capable.
Larry