BMW K bikes (Bricks)

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1Back to top Go down   Alternator weight Empty Alternator weight Wed Jun 24, 2020 11:25 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
Would anyone be able to tell me if there’s a weight difference between the various K engine alternators?
I have a 50 amp but wouldn’t mind switching it out for a 32 if those are lighter...

    

2Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 1:33 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
According to the MAXBMW parts fiche, the 50A weighs 12.24lb and the 32A weighs 7.05lb.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 5:10 am

BobT

BobT
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That would be a weight saving of about 2 kgs, the same as 2.5 litres of fuel. Best to put less in your tank or get rid of that huge tractor battery that most Ks use.

    

4Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 2:29 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
That’s awesome! Thanks for the info Smile
I’m slowly “pre” assembling the bike and was surprised by how heavy the thing is. Truly an automotive piece...

Yes, it may not be worthwhile for most but I’ve reached a point in weight savings where I‘m having to take a look at any essential components..

    

5Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 3:34 pm

Suzi Q

Suzi Q
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Dunno if you've considered a lithium iron battery, but the first time I picked one up I just laughed - it was so light.


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Sometimes I'm not really Suzi Quatro.
    

6Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 4:05 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
Definitely! I’ll be using an Antigravity lithium ion that weighs 2lbs 4oz according to specs and it’ll have a highly simplified electrical system once completed.

    

7Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 8:41 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I've been using a 12 amp Li-ion in Big Block since new - five years - and it has never lost any juice, weighs 3 lbs - stock was nearly 14 lbs. I use a lithium-specified charger (no pulse, which works well on AGM or FLA, but shortens the lithium cells' lives) on it about three times a year.


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1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT, 2013 R1200RT-P & 2022 S1000XR



"We take our bearings, daily, from others. To be sane is, to a great extent, to be sociable."

~John Updike.
    

8Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jun 25, 2020 9:45 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
Good to know, thanks for the info!
Also, many thanks for your Big Block K thread, it’s very informative and has been really helpful while swapping mine.

    

9Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jul 08, 2021 9:29 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
In case anyone would like to know:
50A - 4,150 grams
32A - 3,205 grams

    

10Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jul 08, 2021 10:07 pm

Laitch

Laitch
Life time member
Life time member
Bedlam.Bambi wrote:In case anyone would like to know:
50A - 4,150 grams
32A - 3,205 grams
I tried to weigh my alternator by riding my moto onto a junkyard's scale, then subtracting the weight of all its parts as indicated in the BMW parts fiche from the scale's total, then I realized that the alternator's weight was also published in the the parts fiche. It isn't quite the same as what you have posted, but I wish you'd have posted this data sooner, anyway.

The upside is I found at the yard what I believe to be the driver's side door handle assembly of a 1989 Dodge Omni. Those are really rare.  cheers  Now, I'm looking for an Omni that doesn't have one so I can negotiate a sale with its owner.


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1995 K75 81,000 miles
Alternator weight Usa-lo10
    

11Back to top Go down   Alternator weight Empty Re: Alternator weight Thu Jul 08, 2021 11:49 pm

Bedlam.Bambi

Bedlam.Bambi
active member
active member
Oooh, too bad it wasn’t a third brake light from the GLH-T variant. Someone dressing up their ‘84 GLH might pay big bucks for one of those.

    

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