Recent content by Hatsuwr

A non-subjective comparison between the motors would be pretty difficult without the old one working, but thankfully I am quite familiar with this machine and can confidently say there is a noticeable improvement in cleaning performance. It's also, surprisingly, much quieter, and the highest...

There is an orifice diameter that will roughly match a system in any configuration you want - hose or not, cleaning head or not. There's not really any way around that fact. In a particular configuration, you will achieve a certain amount of airflow. With a fully open orifice plate, if you...

Unfortunately all of that is still based on a misunderstanding of the performance charts. The ratings are not for unimpeded flow - they are based on standardized levels of restriction, ranging from no restriction to zero airflow. I do agree with your last point though - It would be nice to have...

Thankfully Ametek is pretty transparent about their products. You go to their website, enter the model number into the search box, then click 'Datasheet', and it's all right there. I think you might be misunderstanding the performance charts though. Those are performance levels for various...

Guessing it was an internal short that caused it. The motor had a few thousand hours on it, so a good life for a motor of its type and implementation. Full power consumption and performance details are given in the spec sheets of both of the motors. The new one uses more power at any given...

Well, prove us wrong then. Eliminate those variables and add some consistency to your measurements and let's see the effects. Obviously the amount of air going in is equal to the amount of air going out, so the only answer to the question of "why am I measuring a difference" is that your...

My central vacuum's rotor burned out, and considering the cost of just a replacement rotor or a similar motor, it made sense to upgrade the motor for a bit more performance (moving from an estimated 384 air watts to to 700). I saw that the 8.4" generally have the same mounting pattern as the...

You're still talking about 10%+ difference in cross section just from your orifice estimates. Add in the leaks mentioned earlier and imprecise measuring and it really isn't surprising. It seems like at this point, plenty of valid potential answers have been presented, and to figure out exactly...

1/8" difference could explain a lot of what you are seeing, depending on which side is larger. I don't know how big those ports are, but a 1.125" diameter circle has over 26% more surface area than a 1" circle. Add in leaks and imprecise measurements and I don't think there's much mystery. If...

Well if your armature is good and happens to be a 215330, I have a 7.2" motor (115334) that is only missing the armature that I'm giving just for shipping cost. I can't tell what type of motor that is, don't see a serial number or any other identifying info. I'd guess you have something closer...

You have the model number of the vacuum/motor? Any idea what the problem with the motor is?

It seems like you are saying that central vacuums are bad because they have too little power because of system losses... but they are also bad because too much power reduces performance. Regarding motor information - I'm always a fan of companies being more transparent, but in this case I think...

Definitely going to have higher losses in a central vacuum, but those losses decrease as air speed decreases. As you mentioned, peak airflow rates on a wide open system aren't a very good indicator of actual cleaning performance. I'd be surprised if, given the same cleaning head and method of...

Central vacuums can have HEPA level filtration, and plenty of installations have interior exhaust. I'd say the level of filtration needed depends on what you are vacuuming and your proximity to neighbors. I personally don't have any nearby neighbors, so I wouldn't mind the minimum filtration...

Looks like I have some more modifications to plan.