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| | |-+  Alternator mounting bracket selfmade or buying ?
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Author Topic: Alternator mounting bracket selfmade or buying ?  (Read 478 times)
samotorsport
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Posts: 53



« on: January 04, 2020, 20:24:45 pm »

Hey gents , I am going to put a 12V alternator onto my 1835 dragster engine.
I ve got a Denso 6281 alternator already, so I am looking for only a mountng bracket without alternator , Maybe with a pulley for the crankshaft?
If anybody got something for sale or dimensions and or plans on how he has done his bracket I would be very happy if you could share it with me.
Thanks in advance
Best regards
Sam
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samotorsport
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Posts: 53



« Reply #1 on: January 09, 2020, 19:05:11 pm »

After thinking a little about the subject i thought about another solution .
A little more oldschool .
Can one of you guys give me the weight of a stock alternator (with or without internal regulator)
But without the fan installed
I know it would be heavier than the Denso , but also more correct looking . The original tower could also be used .






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Neil Davies
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« Reply #2 on: January 10, 2020, 18:29:45 pm »

I seem to remember someone having a 6v generator rewound as a 12v alternator. Can't remember who though!
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2007cc, 48IDFs, street car. 14.45@93 on pump fuel, treads, muffler and fanbelt. October 2017!
samotorsport
Jr. Member
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Posts: 53



« Reply #3 on: January 10, 2020, 20:00:33 pm »

Are 6 V generators lighter than 12 v ?
12v 30a would be sufficient .
A standard 12v 30a generator would be good enough , i guess i wouldn t need a real alternator 


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karmi
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Posts: 8


« Reply #4 on: January 10, 2020, 21:32:53 pm »

Are 6 V generators lighter than 12 v ?
12v 30a would be sufficient .
A standard 12v 30a generator would be good enough , i guess i wouldn t need a real alternator 


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https://vwkaefershop.de/elektrik/generatoren/generatoren-lichtmaschinen/lichtmaschine-gleichstrom-generator-dc-12volt-4964
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samotorsport
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Posts: 53



« Reply #5 on: January 10, 2020, 22:34:38 pm »

Wow serious money , in that case i check out a std 12 v generator i guess .
Anybody got the weight of that one ?


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Martin S.
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« Reply #6 on: January 11, 2020, 00:18:01 am »

I have a 12V gen I can weigh when I get a chance Iíll do it.
I tried one of those $50 booster packs the size of a pack of smokes and it turned over my stock engine bug faster than the battery even with no car battery connected. Anyone tried one on their big motor? It makes me think you could eliminate the battery and use this thing to save weight.
It charges with a phone charger so how hard could it be to keep charged?
I bet a tiny generator like on a motorcycle could charge it.
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
karmi
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Posts: 8


« Reply #7 on: January 11, 2020, 21:24:32 pm »

The lightest and best generator is the 55 amp alternator from Bosch. I weighed the and the 30 amp alternator, which is much heavier. I can weigh that again. It is a mistake to think that the alternator is constantly charging at 55 amps. He only does this when a lot of electricity is used. If only the car is running, the ignition system needs about 5 amps. It is best to have a small gel battery from the motorcycle with approx. 25-30 amps or a very light battery for racing cars (very expensive) and to fully charge it before a start (without a battery it will not work, I think). Then start the car with a lithium booster so that little power is drawn from the gel battery. Then the 55 ampere needs only a little recharge and you lose the least engine power. At least that's what I will do with my beetle.
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samotorsport
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Posts: 53



« Reply #8 on: January 12, 2020, 09:19:49 am »

Up to now i was driving without charging at all , i had a 47ah car battery installed , fully charged and you could feel that over the weekend without real chance on recharging it the power dropped .
Now i ve put a little 22 amp battery in , saves me around 5 kg .
But nevertheless i tought of charging it to have it always at the max power .
When running at 8000 rpm i wanna have as much power for the spark plug i possibly can .



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karmi
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« Reply #9 on: January 12, 2020, 14:09:53 pm »

Thumbs up!  Smiley
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Martin S.
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« Reply #10 on: January 12, 2020, 20:19:04 pm »

I weighed the 12v gen and itís about 15 lbs. (7 kg).
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
samotorsport
Jr. Member
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Posts: 53



« Reply #11 on: January 12, 2020, 20:24:12 pm »

Thanks a lot , wow thats a lot ! I hoped it was a little less .
In that case i guess the Denso is the better option .
In the end less weight for better electrical stability .
Thanks for the help from all of you .
I better start creating a bracket .
Still have to find out how much max rpm the Denso takes before the bearing waves good bye 😂


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Martin S.
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« Reply #12 on: January 12, 2020, 23:01:47 pm »

Whatís the weight of the Denso?
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
samotorsport
Jr. Member
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Posts: 53



« Reply #13 on: January 13, 2020, 07:03:31 am »

2,7 kg


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samotorsport
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Posts: 53



« Reply #14 on: January 21, 2020, 13:01:49 pm »



Does anybody got this type of bracket and is willing to give me some measurements on it ?
Maybe with a straight up picture where i could find out the remaining dimensions ?
I wanna build one my self .
Actually two , one for me , one for a friend .
Thanks in advance
Sam


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