Thread Number: 33628
/ Tag: 80s/90s Vacuum Cleaners
Hoover Convertible (U4007) Airflow Losses |
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Post# 365892   1/30/2017 at 20:00 (2,613 days old) by wyaple (Pickerington, OH)   |   | |
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The first measurement was easy to get, the last one (CFM at the nozzle) required me to build an airflow box. I think this pic should easily illustrate where and by how much CFM is lost in this machine. This is excellent performance from a 32 year old cleaner.
From the base of the machine to the nozzle, there is a loss of 120-100 = 20 CFM. This represents about a 17% loss from the direct air motor. Of course as the bag fills, the airflow will drop as well. Last note: the rug plate opening is on the small side, measuring 23 square inches BUT the CFM density tops my charts, about 4.4 CFM/Sq. In. If you ever wondered if this old beast was still capable of deep cleaning, it certainly is. This is my first Hoover Convertible and I was completely blown away with it's performance (and great sound quality). This old dude actually bests my 2012 Kirby Sentria II in CFM density. Bill |
Post# 365903 , Reply# 1   1/31/2017 at 00:31 (2,613 days old) by bnsd60m9200 (Akron OH)   |   | |
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Post# 365915 , Reply# 2   1/31/2017 at 09:15 (2,613 days old) by kloveland (Tulsa)   |   | |
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Post# 365918 , Reply# 3   1/31/2017 at 09:58 (2,613 days old) by wyaple (Pickerington, OH)   |   | |
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I wasn't too sure when this machine was made, then I saw pic #1. The foil tape has a date of 6/85. Maybe that was when it was last serviced? But, when was the last time someone dated foil tape? So, I guessed. BUT, I was sincerely hoping that it was a 70's machine. The oldest vacuum I have before picking up the convertible is a 1980 Lux 1401-B, so I'm very happy that this one appears to be older.
Pic #2 show the manufacturing data. Maybe the serial number is 0042651? Pic #3 shows the hood. Bill |
Post# 365920 , Reply# 4   1/31/2017 at 10:14 (2,613 days old) by wyaple (Pickerington, OH)   |   | |
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If someone can pinpoint the exact year, let me know!
Kenny, This was one of the machines of my childhood. Everybody had one. I was never allowed or shown how to use vacuums even though I was fascinated with them. I didn't have any idea that Convertibles could possibly keep up with a modern Kirby. I haven't measured the suction yet, but if I can make an adapter to fit the fan directly, I'll post the results. Bill |
Post# 365972 , Reply# 5   2/1/2017 at 11:34 (2,612 days old) by gottahaveahoove (Pittston, Pennsylvania, 18640)   |   | |
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Post# 366011 , Reply# 6   2/2/2017 at 00:49 (2,611 days old) by bnsd60m9200 (Akron OH)   |   | |
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Post# 366015 , Reply# 7   2/2/2017 at 02:19 (2,611 days old) by Mike811 (Finland)   |   | |
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Post# 366016 , Reply# 8   2/2/2017 at 02:23 (2,611 days old) by pr-21 (Middletown, OH)   |   | |
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I was obsessed once years ago about water lift, until someone on this forum explained the difference between water lift and air flow. I even have a water lift gauge which I do not even use anymore. Rainbows do not have great water lift, but Rexair sure knows about airflow. If my Rainbow SE PE had the newer power nozzle that the E2 Black has, I believe it would out clean the E2 Black, due to the E2 Black having the added hepa filter, which in my opinion is not necessary. If you don't pick up non wettable material, which I do not, it will stay clean for years. I actually changed mine and cut it open and it was still spotless, the same as another member on this forum has just done recently.
Not trying to hijack this thread, I appreciate all the testing you have done, it has been interesting to see. Thank You PS I grew up with Eureka's and Hoover's. I recently purchase a NOS Eureka 2033 on Ebay with a 3.5 amp motor and put a Vibra Groomer in it. Excellent cleaner even at 3.5 amps..... PR-21 Bud |
Post# 366023 , Reply# 9   2/2/2017 at 10:31 (2,611 days old) by wyaple (Pickerington, OH)   |   | |
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I have a Gsix and it tests at 120 CFM at the nozzle with a clean HEPA bag. BUT, I call your attention to "airflow density". While the Kirby does have more total airflow than the much older Hoover, the CFM per square inch is lower in the Kirby. My measurements say the Kirby Gsix is 3.54 CFM/Sq. In. versus the Convertible's 4.36 CFM/Sq. In. The bottom line is that while both machines are excellent, the older Hoover should pick up more dirt although it would take longer to do that due to the smaller nozzle size (Hoover=23 Sq. In. versus Kirby=33.8 Sq. In.).
Bill |
Post# 366024 , Reply# 10   2/2/2017 at 10:43 (2,611 days old) by wyaple (Pickerington, OH)   |   | |
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I think you have airflow and water lift flipped? Rainbows aren't known for great airflow. I restored two SE's now and the 1993 model does 60 CFM at the hose while the 1997 SE PE does 65 CFM at the hose.
Water lift results are below: Rainbow D4C SE from base (empty bowl) = 58" lift Rainbow D4C SE from hose end (empty bowl) = 54" lift Rainbow D4C SE PE from base (empty bowl) = 60" lift Rainbow D4C SE PE from hose end (empty bowl) = 54" lift Unfortunately, by the time you measure airflow at the power nozzle, the CFM drops dramatically. The 1997 SE PE tests at 33 CFM and the older 1993 SE (different PN) tests better at 42 CFM. Please understand, I'm not saying these machines don't pickup dirt, but if Rexair would at least double the airflow, I'd bet they would do much better. I enjoy using both of them and watching what accumulates in the water bowl. Bill |
Post# 366029 , Reply# 11   2/2/2017 at 11:37 (2,611 days old) by Mike811 (Finland)   |   | |
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Nice to hear that Kirby does have a great airflow.
By the way. How I can get the Kirby baird manometer or how it is called. I mean airflow meter to fit the Kirby or one what many vacuum stores use in their youtubevideos. I remember that it has 0 to 10 range.
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Post# 366034 , Reply# 12   2/2/2017 at 14:35 (2,610 days old) by wyaple (Pickerington, OH)   |   | |
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Here's some Baird company info:
Baird Meter Inc 1932 North 11th St Springfield, IL 62702 Phone: (217) 522-5858 Hope this helps. I bought mine 2 years ago for about $30 USD. Bill CLICK HERE TO GO TO wyaple's LINK |
Post# 366230 , Reply# 13   2/6/2017 at 09:22 (2,607 days old) by kirbyvertibles (Independence, KS)   |   | |
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Post# 367654 , Reply# 14   2/28/2017 at 10:33 (2,585 days old) by wyaple (Pickerington, OH)   |   | |
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Post# 367657 , Reply# 15   2/28/2017 at 10:52 (2,585 days old) by vacuumlad1650 (Wauponsee, IL)   |   | |
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