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 1Likes
03-06-2013, 03:03 AM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
What size is your alternator?
Hi all,
When fabricating my engine bay, stupid me forgot about accessories. I am trying to find a small alternator. I have found one that is 4.5" long and 4" diameter but only up to 70amp. Is this enough for ls3 ECU, lights, electronic gauges, and basic stereo set up? I think it should be but don't want to be under powered.
Cheers
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03-06-2013, 03:21 AM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
70amp would be heaps for a basic Cobra.
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03-06-2013, 05:23 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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I have a 100 amp now. I first had a 65 amp and that was just not enough. By the way I have a brand new 65 amp alternator if anyone wants it for cheap!
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03-06-2013, 05:53 AM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Is the problem that you can't fit the standard alternator in the standard location low down on the left hand side?.
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03-06-2013, 11:10 AM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Yes, no room down low. I need to put it up high on the passenger side next to the rocker covers.
Clois, do you have fancy electronics or big stereo set up with amp?
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03-06-2013, 11:23 AM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
Quote:
Originally Posted by Clois Harlan
I have a 100 amp now. I first had a 65 amp and that was just not enough. By the way I have a brand new 65 amp alternator if anyone wants it for cheap!
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i am getting ready to install a 65 amp, what was it not enough for? |
03-06-2013, 11:35 AM
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CC Member
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Join Date: Jul 2011
Location: Sydney,
NSW
Cobra Make, Engine: Puckett 250 GTO - LS1
Posts: 567
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Not Ranked
In the GTO I had a slight physical fit issue with the alternator and had to use a smaller ‘F-Body’ one – cheap from US. The other thing is I had to move the aircon compressor to where you’re contemplating now installing the alternator. I’m in Sydney (The Shire) and later today my engine will be removed from my car and you are more than welcome to borrow the alternator to see if it fits and to take the aircon compressor mounts to use as templates to make an alternator mount. Send me a message if you are interested.
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03-06-2013, 12:27 PM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Hi Peter,
It will have to be even higher than the AC in that picture. It will be almost directly above the rocker cover (where the coils are).
Thanks for the offer to borrow your alternator. I live on the northern beaches so its a bit far to pick up and drop off. I have made a cardboard alternator based on dimensions i could find on the net. I think i can fit it ok, but its just whether the 70 AMPS will be enough.
I am able to work out the draw of the lights and radio, but don't know how much to allow for LS engine management and fuel pump.
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03-06-2013, 01:31 PM
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CC Member
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Join Date: Jan 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison, 6.0L Chev
Posts: 2,513
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Not Ranked
Zedn if you can run the engine for a short while without an alternator, maybe measure the current draw down at the fuel pump using a multimeter? ECU draw would be minimal at a guess. I found voltage drop to be more of a problem for the computer.
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03-06-2013, 02:08 PM
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CC Member
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Join Date: Mar 1999
Location: Redding,
CA
Cobra Make, Engine: Cobra Maker
Posts: 722
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Not Ranked
I use a 65 amp bobcat alternator it runs engine fan inter cooler fan intercooler pump headlights 8 coils ECU and haligen headlights and AC with no problems. They run around $125.oo 
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Bill Emerson
Last edited by Bill E; 03-06-2013 at 02:22 PM..
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03-06-2013, 02:32 PM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Hi Bill,
Did you modify the alternator cooling fans to run it backwards like you have?
I had considered doing this, but thought it might not look very good. Looks fine on your set up.
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03-06-2013, 02:45 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Quote:
Originally Posted by Zedn
Yes, no room down low. I need to put it up high on the passenger side next to the rocker covers.
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Then you may be interested in this new Holly alternator bracket.:
Holley Performance LS Swap Accessory Drives Products
Only $149.95 at Summit without the spacer kit. Can leave the PS off if you want.
Install dimensions here: http://www.holley.com/data/Products/...R10607rev5.pdf
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Last edited by Rebel1; 03-06-2013 at 03:03 PM..
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03-06-2013, 03:17 PM
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CC Member
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Join Date: Feb 2002
Location: Alice Springs, central Australia,
NT
Cobra Make, Engine: Classic revival kit (CR3181), gen III engine, T56 6 speed box, AU XR8 lsd diff
Posts: 5,699
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Not Ranked
From memory older Honda engines rotate "backward" compared to most other makes, so maybe look for an older model Civic Alternator to mount reversed?
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03-06-2013, 04:10 PM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Quote:
Originally Posted by Rebel1
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Thanks for that, i will check it out. I will probably fab my own bracket but its good to see some ideas. |
03-06-2013, 04:11 PM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Quote:
Originally Posted by boxhead
From memory older Honda engines rotate "backward" compared to most other makes, so maybe look for an older model Civic Alternator to mount reversed?
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Backwards? Do you use reverse gear to go forwards? 
Im pretty sure that all will charge either way, but from the reading i have done there can be cooling issues with running them backwards as the fan is blowing the other way. |
03-06-2013, 04:21 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Quote:
Originally Posted by Zedn
Thanks for that, i will check it out. I will probably fab my own bracket but its good to see some ideas.
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Here is another cheaper bracket:
F-Body LS1 High Mount Alternator Relocation Bracket - Speedway Motors, America's Oldest Speed Shop
Puts the alternator a little lower, more beside the head, than the holly bracket.
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03-06-2013, 04:22 PM
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CC Member
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Join Date: Mar 1999
Location: Redding,
CA
Cobra Make, Engine: Cobra Maker
Posts: 722
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Not Ranked
No fan in it industrial quality. I like them because they don't brake
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Bill Emerson
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03-06-2013, 04:26 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
And, if you are bent on making your own bracket, this may give you some ideas.:
http://www.kwikperf.com/pdf/alt_only_installation.pdf
__________________
It's impossible to soar like an eagle when you're surrounded by turkeys.
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03-06-2013, 05:03 PM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
Quote:
Originally Posted by Rebel1
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Thats the style i had in mind. Pretty simple with a bit flat plate and tubing. I saw that in a link on another post you had put up when i searched.
Cheers. |
03-06-2013, 05:14 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Quote:
Originally Posted by Zedn
Thats the style i had in mind. Pretty simple with a bit flat plate and tubing. I saw that in a link on another post you had put up when i searched.
Cheers.
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Yep, easy to make but a bit agricultural. The Holly is cheap and looks factory.
That's if it fits because it is 17" from engine center line to outside of alternator.
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