FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#1
|
|||
|
|||
Stock appearing high output alternator?
The car is a 1978 W72 4 speed. The prior owner installed a chrome high output single pole Powermaster alternator and I would like to replace it with a more stock looking natural finish high output alternator. 100 amp minimum.
Who makes one that looks closer to stock? Keeping a single pole is ok. I’m more interested in getting rid of the chrome look. A part number would be appreciated if possible. Here is a picture of the existing one. Thanks Last edited by Billablehours; 02-16-2021 at 11:33 PM. |
#2
|
||||
|
||||
You could take the guts from your chrome unit and put them in an original natural case. Your existing unit appears to be based off from a Delco 10SI
__________________
1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 |
#3
|
|||
|
|||
Not sure of the rating, but I got the higher rated 'stock' alt. from my local NAPA. No problems with it. 77 400 warmed up a bit automatic. I believe the cars with A/C had the higher output unit.
|
#4
|
||||
|
||||
Higher output in 1977-78 was 63 A. 1976 was the last year of the large case 80 A. unit.
__________________
1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 |
#5
|
|||
|
|||
Quote:
It you want to buy a new one with up to 140 Amps, go here: https://alternatorparts.com/10si-alt...-and-kits.html That being said, heat is your enemy, and more amps makes more heat. There is a model called a 12Si that came out in about 1984 or so for high amperage applications. It has much better cooling. It bolts in and wires in the same. It looks similar except for the fan is flat on the front. I think that stock they cam with up to 94 Amps. You can get a high output one here: https://alternatorparts.com/10si-12s...ternators.html. When you say single pole, do you mean single wire? I would not recommend this especially in you application where you apparently have high current accessories. It will under charge your battery when you have your accessories turned on. I am not sure why anyone would do this in a car that came with 3 wires to the alternator. The hot rod guys like these because they are starting with no wiring, have few accessories, are lazy and cheap, and don't understand electricity anyway. It is important to have the voltage sensing point electrically close to the battery. The important thing being that the wire(s) between the sensing point and the battery only only carries starter current and charge/discharge current and nothing else. With a single wire alternator, the sense point is at the alternator and separated from the battery by a wire carrying all of the steady state current. The factory did not not include the extra wires because they had extra wire that they needed to use up. As Tom V says, engineers do things for a reason. |
The Following User Says Thank You to shermanator2 For This Useful Post: | ||
#6
|
||||
|
||||
Powermaster 7294
__________________
Chris D 69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60' |
The Following User Says Thank You to OCMDGTO For This Useful Post: | ||
#7
|
||||
|
||||
__________________
1970 GTO (Granada Gold) - 400 / TH400 |
The Following User Says Thank You to vertigto For This Useful Post: | ||
#8
|
|||
|
|||
you ok using a 12si?
10si is not gonna have enough low speed output compared to 12si, CS-144, etc... 12si was just a little bigger and i've had decent luck with them just remember change that charging line off the alt.... if you need to pull some amps... that stock wire isn't gonna last long also becareful getting high amp alts... some of them list them as high amps, but all they do is change the pulley to speed it up |
The Following User Says Thank You to Don 79 TA For This Useful Post: | ||
#9
|
|||
|
|||
For the guys running the powermaster 7294, being that the stock alternator had the plug on the top, 12:00 and the power master has the plug at 3:00, or towards the passenger side, did you have any problems with that new plug location with your hook up?
I get my clocking nomenclature from that mad electric website. |
#10
|
||||
|
||||
My 81 TA Turbo 301 had a bigger case alternator originally.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
Reply |
Thread Tools | |
Display Modes | |
|
|