Thread Number: 12983
1981 and Older Royals Refitted with Later Motors
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Post# 138463   6/4/2011 at 04:50 (4,648 days old) by KirbyClassicIII (Milwaukie, Oregon)        

kirbyclassiciii's profile picture
OK, so, I want to pose this question to all of you Royal fanatics: do any one of you actually have a repowered 1981 or older Royal (originally with a 350-watt, 400-watt or 3.0 amp motor, as is stated on the nameplate), with any of the (non-drop-in) motor assemblies from the 1982-early 1995 models???

Reason I am posing this question here is because the 1981 and older Royal motors tend to not be as strong compared to the 1982-1995 motor designs. Until April 1985, every Royal upright had a single motor design with the same amperage on all. It was that time when Royal brought out the 5.4 and 6.0 amp motors (the latter was first used on Royal's first wide-track commercial upright, the 618). Then, in April 1990, the last and strongest non-drop-in motor rated 7.0 amps showed up.

List of motor designs used from 1982 to 1st qtr. 1995:
1982-1987: 4.5 amps (through 3/85 on models 608, 801, 880 and 903; also used on models 153, 602, 604, 607, 611 and 777)
1985-1987: 5.4 amps (used on models 608, 801, 880 and 903)
1987-1995: 5.0 amps (used on models 654, 655, 656, 882, 883, 7500 and 7510)
1985-1995: 6.0 amps (used on models 360-361, 380-381, 618, 660-663, 680-683, 881, 884, 885, 886, 887, 889, 992, 993, 6005, 6103, 6805, 7600-7630, 7800-7830, 8000, 8801AE, 9000, 9005, 9089, 85103 and 89103)
1990-1995: 7.0 amps (used on models 670-673, 690-693, 994, 995, 996, 7700-7730, 7900-7930, 9100 and 9700)

So, that would mean... grouped by quality grade (years in parentheses list motor design then being produced at the time of rebuild), these would be the preferred replacement motor designs:

GOOD quality models 1981 and older would use the 4.5 amp (1982-87) or 5.0 amp (1987-95) motor assemblies.

BETTER quality models 1981 and older would use the 4.5 amp (1982-85), 5.4 amp (1985-87) or 6.0 amp (1985-95) motor assemblies.

BEST quality models 1981 and older would use the 4.5 amp (1982-85), 5.4 amp (1985-87), 6.0 amp (1987-90) or 7.0 amp (1990-95) motor assemblies.

In summary, the motor designs from 1987-1995, rated 5.0 amps (good), 6.0 amps (better/best) and 7.0 amps (best, mid-1990 to 1995), would be preferable.

The impeller fan used through early 1990 had six blades, whereas since April 1990 the fan had nine blades.

What do you think? Have any of these later motor designs actually improved the performance of your weak Royal?

Also, are there any considerations as to what models these particular 1987-95 generation assemblies will not fit?

~Ben



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