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6061 Aluminum alternator bracket

 
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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Mon Mar 01, 2010 2:44 pm    Post subject: 6061 Aluminum alternator bracket Reply with quote

I want some opinions on this. I made this up on the mill here at the office. This bracket from the water pump to the alternator is a thicker 6061 aluminum copy of the factory steel bracket. I think it would be ok for a street car but I'm thinking of making another one since I have the stock laying around. The next one will look more like what is on ebay for 30 bucks with a straight bar from the alternator to the lower attaching bolt of the water pump.
Opinions please?


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2001 Focus 2.0 Zetec
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15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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robins44
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PostPosted: Mon Mar 01, 2010 5:16 pm    Post subject: Reply with quote

looks good, turned out nice! Cool
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clay
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Joined: 24 Nov 2002
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1972 Chevrolet Nova

PostPosted: Mon Mar 01, 2010 5:28 pm    Post subject: Reply with quote

I'm guessing that is basically providing support for that long bolt that screws into the head. It should be plenty strong enough and even the single bar like you are describing should be plenty strong, however what you have there looks better in my opinion. Clay
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Mon Mar 01, 2010 5:59 pm    Post subject: Reply with quote

looks good so far
watch out your alt. will look too shabby soon Laughing

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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Mon Mar 01, 2010 6:03 pm    Post subject: Reply with quote

Thanks Clay,
This is what I meant by the bar type bracket. It might be stronger than what I have but the question is how strong does it need to be when you whack the throttle and stress it hard?


http://cgi.ebay.com/ebaymotors/Polished-Aluminum-SBC-Chevy-Alternator-bracket-350-383_W0QQcmdZViewItemQQhashZitem3caa7f8047QQitemZ260558520391QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Squeezer,
I am getting an aluminum pulley and fan for the alternator next. Just $$ you know....

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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Mon Mar 01, 2010 7:13 pm    Post subject: Reply with quote

i bet that ebay bracket isnt near as strong as yours. usually when the ad makes no mention of material its just cast aluminum. i would make one out of 6061 1/2" thick.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon Mar 01, 2010 7:30 pm    Post subject: Reply with quote

I can make one similar to what is there but it is 6061 3/8" stock. It should still be stronger than that ebay stuff I do agree. I won't countersink the holes either.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Mon Mar 01, 2010 8:26 pm    Post subject: Reply with quote

yeah, 3/8" should be fine. i just said 1/2" because thats whats laying in the scrap pile Wink .
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon Mar 01, 2010 11:58 pm    Post subject: Reply with quote

10sec.et wrote:
yeah, 3/8" should be fine. i just said 1/2" because thats whats laying in the scrap pile Wink .


I have a 3/8" scrap pile not as nice as a 1/2" scrap pile. Besides the ARP bolt won't have that much thread going into the head if I use 1/2" I guess I could shave off a little of the alternator case. Right now I have to take an 1/8" off the back side of the bracket for alignment with the pump. If I take an 1/8" off the alternator case that would make it a straight shot and the bracket could remain a constant thickness. I still might machine a triangle out of the middle of it without sacrificing any strength.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Big Dave
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PostPosted: Tue Mar 02, 2010 2:01 am    Post subject: Reply with quote

It is more than strong enough, problem with aluminum is work hardening. You want to polish the beam logintudinally, possibly anodize it to [protect it from corrosion as well.

Big Dave
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clay
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1972 Chevrolet Nova

PostPosted: Tue Mar 02, 2010 12:10 pm    Post subject: Reply with quote

I think that by it mainly supporting the end of the mounting bolt, either version should be plenty strong enough. One thing you could do is just make the triangle area a pocket instead of going all the way through - still get the visual effect but retain more strength. Clay
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Skunkworkx
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1968 Chevrolet Camaro

PostPosted: Tue Mar 02, 2010 9:01 pm    Post subject: Reply with quote

Looks pretty good for a first go Smile

In no time you'll have 20 orders Very Happy

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon May 31, 2010 12:03 pm    Post subject: Reply with quote

Finished up the upper bracket. March 5.5" lower pulley and Skip White water pump pulley.

I do have a Mr. Gasket Lower pulley 6" for sale that I installed on the crank in the first pic for sale. It is basically new and back in the package. I liked the March pulley as it was a slight under drive for the water pump. The steel setup is also for sale. PM me if you anyone is interested.


_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Wed Jun 02, 2010 2:31 am    Post subject: Reply with quote

MUCH better Cool .
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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Joined: 15 Aug 2002
Posts: 2403
Location: Townsend, Mass.
81572.74 points


1971 Chevrolet Chevelle

PostPosted: Wed Jun 02, 2010 10:33 am    Post subject: Reply with quote

Thanks! I hate to say it but the old upper bracket was a chrome Ford small block alternator bracket flipped over. Embarassed
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
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