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#1
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Does any alternator* fitted in cars have an impeller ?
My NipponDenso * has no fan / impeller to pull air into * to cool
*, so this * ( esp when heated by engine block ) gets too hot ( can boil an egg ) in 33șC air, output ( ampere & voltage ) drops too low just as described in www.aa1car.com/library/charging_checks.htm last paragraph. Users cannot fit an impeller because no space exists between ( drive belt's ) pulley & * ( like in this web page's photo ). I presume such *'s designers want to keep * small, to fit * into engine compartment, but leaving out an impeller ( & let * overheat , as per this web page ) looks ridiculous. My Hitachi lawn mower's motor has an impeller : motor never gets hot if impeller is fitted. Our 3 Black & Decker trimmers' motors have no impeller, all 3 motors' coils melted in 33șC air & had to be recoiled. |
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#2
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Does any alternator* fitted in cars have an impeller ?
On Jun 20, 6:54 am, "TE Chea" > wrote:
> My NipponDenso * has no fan / impeller to pull air into * to cool > *, so this * ( esp when heated by engine block ) gets too hot ( can > boil an egg ) in 33șC air, output ( ampere & voltage ) drops too > low just as described inwww.aa1car.com/library/charging_checks.htmlast paragraph. > Users cannot fit an impeller because no space exists between ( > drive belt's ) pulley & * ( like in this web page's photo ). > I presume such *'s designers want to keep * small, to fit * into > engine compartment, but leaving out an impeller ( & let * overheat > , as per this web page ) looks ridiculous. > My Hitachi lawn mower's motor has an impeller : motor never gets > hot if impeller is fitted. Our 3 Black & Decker trimmers' motors > have no impeller, all 3 motors' coils melted in 33șC air & had to be > recoiled. Have you looked inside the unit yet? Look near the rear, just in front of the steel endcap, through the cast holes in the rear case (with a flashlight). There should be a steel fan attached to the rear end of the rotor. ND makes probably the most reliable alternators I have ever seen in production. Perhaps if they were speced more poorly they would need an external fan. I don't know how that would would be superior to the current design, unless they employed Delphi CS series front bearings. A front fan doesn't even keep those POS (plural) from failing. Toyota MDT in MO |
#3
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Does any alternator* fitted in cars have an impeller ?
Comboverfish > wrote in
ps.com: > On Jun 20, 6:54 am, "TE Chea" > wrote: >> My NipponDenso * has no fan / impeller to pull air into * to cool >> *, so this * ( esp when heated by engine block ) gets too hot ( can >> boil an egg ) in 33șC air, output ( ampere & voltage ) drops too >> low just as described >> inwww.aa1car.com/library/charging_checks.htmlast pa > ragraph. >> Users cannot fit an impeller because no space exists between ( >> drive belt's ) pulley & * ( like in this web page's photo ). >> I presume such *'s designers want to keep * small, to fit * into >> engine compartment, but leaving out an impeller ( & let * overheat >> , as per this web page ) looks ridiculous. >> My Hitachi lawn mower's motor has an impeller : motor never gets >> hot if impeller is fitted. Our 3 Black & Decker trimmers' motors >> have no impeller, all 3 motors' coils melted in 33șC air & had to be >> recoiled. > > Have you looked inside the unit yet? Look near the rear, just in > front of the steel endcap, through the cast holes in the rear case > (with a flashlight). There should be a steel fan attached to the rear > end of the rotor. I just happen to still have my old ND alternator from my '91 Integra. I study this unit, and lo and behold there is an impeller at BOTH ENDS: both the diode end and the pulley end. One is evidently a "pusher" and one a "puller". Both impellers are within the casing and are not readily visible without close observation, but are unmistakeably present. -- Tegger |
#4
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Does any alternator* fitted in cars have an impeller ?
TE Chea wrote:
> My NipponDenso * has no fan / impeller to pull air into * to cool > *, so this * ( esp when heated by engine block ) gets too hot ( can > boil an egg ) in 33șC air, output ( ampere & voltage ) drops too > low just as described in > www.aa1car.com/library/charging_checks.htm last paragraph. > Users cannot fit an impeller because no space exists between ( > drive belt's ) pulley & * ( like in this web page's photo ). > I presume such *'s designers want to keep * small, to fit * into > engine compartment, but leaving out an impeller ( & let * overheat > , as per this web page ) looks ridiculous. > My Hitachi lawn mower's motor has an impeller : motor never gets > hot if impeller is fitted. Our 3 Black & Decker trimmers' motors > have no impeller, all 3 motors' coils melted in 33șC air & had to be > recoiled. ALL of the alternators I have ever worked on have had some sort of fan (various Delcos, Prestolites, Bosches and Motorolas) nate -- replace "roosters" with "cox" to reply. http://members.cox.net/njnagel |
#5
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Does any alternator* fitted in cars have an impeller ?
Comboverfish wrote:
> On Jun 20, 6:54 am, "TE Chea" > wrote: > >>My NipponDenso * has no fan / impeller to pull air into * to cool >>*, so this * ( esp when heated by engine block ) gets too hot ( can >>boil an egg ) in 33șC air, output ( ampere & voltage ) drops too >>low just as described inwww.aa1car.com/library/charging_checks.htmlast paragraph. >>Users cannot fit an impeller because no space exists between ( >>drive belt's ) pulley & * ( like in this web page's photo ). >>I presume such *'s designers want to keep * small, to fit * into >>engine compartment, but leaving out an impeller ( & let * overheat >>, as per this web page ) looks ridiculous. >>My Hitachi lawn mower's motor has an impeller : motor never gets >>hot if impeller is fitted. Our 3 Black & Decker trimmers' motors >>have no impeller, all 3 motors' coils melted in 33șC air & had to be >>recoiled. > > > Have you looked inside the unit yet? Look near the rear, just in > front of the steel endcap, through the cast holes in the rear case > (with a flashlight). There should be a steel fan attached to the rear > end of the rotor. Correct- every ND alternator I've ever seen looks like a small clone of the original Chrysler alternator- finned case with a fan on each end of the shaft (two fans) on the INSIDE of the finned case. No big external fan required. |
#6
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Does any alternator* fitted in cars have an impeller ?
| Have you looked inside the unit yet?
No, I could not pull its rear cover ( part #15 in w-page of url attached, has ND embossed on it ) off, after removing 3 nuts. | There should be a steel fan attached to the rear end of the rotor. No fan visible in diagram of this w-page, url attached : http://www.hondaautomotiveparts.com/...tcgry4=KA4AT&c atcgry5=ALTERNATOR+%28DENSO%29 | ND makes probably the most reliable alternators I have ever seen in | production. Possible ; how this * can survive such heat amazes me. |
#7
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Does any alternator* fitted in cars have an impeller ?
On Thu, 21 Jun 2007 12:57:19 +0800, "TE Chea" > wrote:
>| Have you looked inside the unit yet? >No, I could not pull its rear cover ( part #15 in w-page of url >attached, has ND embossed on it ) off, after removing 3 nuts. > >| There should be a steel fan attached to the rear end of the rotor. >No fan visible in diagram of this w-page, url attached : >http://www.hondaautomotiveparts.com/...tcgry4=KA4AT&c >atcgry5=ALTERNATOR+%28DENSO%29 > > >| ND makes probably the most reliable alternators I have ever seen in >| production. >Possible ; how this * can survive such heat amazes me. > I had to look twice, with a high power flashlight, inside the back of my alternator to find the cooling fins, but they are present in my Vulcan V6 Ford engine alternator. At first it didn't look like there were any, so you have to look closely. Maybe reading glasses will help. Mine are right at the coil windings. Lg |
#8
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Does any alternator* fitted in cars have an impeller ?
"TE Chea" > wrote in :
>| Have you looked inside the unit yet? > No, I could not pull its rear cover ( part #15 in w-page of url > attached, has ND embossed on it ) off, after removing 3 nuts. Wiggle it some more. 3 nuts is all that holds it on. > >| There should be a steel fan attached to the rear end of the rotor. >| > No fan visible in diagram of this w-page, url attached : <snip> Go look at your own alternator. Pictures are not always worth a thousand words. Sometimes they're worth less than zero words. ND alternators have, not one, but TWO fans. And on further investigation, it is clear I was wrong in my original guess that one fan was a puller and one a pusher. BOTH fans are pullers. Both fans pull air in from their respective ends, then exhaust it radially through the slots in the perimeter of the alternator casing. It appears that this is the sole purpose of those slots: Air exhaustion and alternator cooling. -- Tegger |
#9
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Does any alternator* fitted in cars have an impeller ?
On Jun 21, 8:35 pm, Tegger > wrote:
>Both fans pull air in from their respective ends, then exhaust it radially > through the slots in the perimeter of the alternator casing. It appears > that this is the sole purpose of those slots: Air exhaustion and alternator > cooling. > > -- > Tegger That might be the original reason for their existence, but I like to use them as stroboscopic diffusers for my alternator's neon lighting. What, am I alone here? Toyota MDT in MO |
#10
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Does any alternator* fitted in cars have an impeller ?
Comboverfish > wrote in
oups.com: > On Jun 21, 8:35 pm, Tegger > wrote: >>Both fans pull air in from their respective ends, then exhaust it >>radially >> through the slots in the perimeter of the alternator casing. It >> appears that this is the sole purpose of those slots: Air exhaustion >> and alternator cooling. >> >> > > That might be the original reason for their existence, but I like to > use them as stroboscopic diffusers for my alternator's neon lighting. > What, am I alone here? > > > > You are utterly, tragically alone. Stroboscopic lighting in an alternator indeed. <snorts in disgust> Why can't you be like decent, tasteful people and stick to stroboscopic under-car neon lighting? -- Tegger |
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