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09-28-2011
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#1 |
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Join Date: Jul 2010
Location: Fairfax, VT
Posts: 203
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Measurement of stock alternator housing
Greetings to the Forum
I need a favor from someone on the forum. I need the diameter measurement of the alterator housing on a stock alterator from a 1990 ZR. If someone could measure the diameter of the rear of the housing and let me know what it is I can be sure if my new unit will fit. Many thanks, Don 
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09-28-2011
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#2 |
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,609
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Re: Measurement of stock alternator housing
5 5/8" is what I get when I measure the back side with a tape. That is not using the ears that are for the bolts that hold the front & back sides of the case though.
If I use my digital slide ruler I get 5.6". This is a 91 alternator, it's my spare. I do think that all the LT5's use the same alternator?  Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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09-28-2011
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#3 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Measurement of stock alternator housing
is your new unit from a LT1/4? if so it will not fit
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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09-28-2011
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#4 |
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Join Date: Jul 2010
Location: Fairfax, VT
Posts: 203
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Re: Measurement of stock alternator housing
Hi TomTom,
Thanks for the measurement. My alternator measures the same. Regards, Don |
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09-28-2011
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#5 |
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Join Date: Jul 2010
Location: Fairfax, VT
Posts: 203
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Re: Measurement of stock alternator housing
Hi Jeff,
Thanks for the heads up on the LT1/4 aternators. Could you get back to me with just what the difference is, in alternators, between the LT5 and the LT1/4? Regards, Don |
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09-28-2011
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#6 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Measurement of stock alternator housing
Case size. The LT1/5 have a larger case then the LT5 does
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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09-29-2011
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#7 | |
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,120
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Re: Measurement of stock alternator housing
Quote:
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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09-29-2011
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#8 |
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Join Date: Jul 2010
Location: Fairfax, VT
Posts: 203
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Re: Measurement of stock alternator housing
My case appears to be the right size @ 5.6 in. I just hope the mounting ears are in the right place. The electrical seems to be OK. The pulley diameter is a bit larger so I will have to pick a longer belt but that is no big problem.
Thanks for the help Don
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09-29-2011
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#9 |
 Join Date: Sep 2011
Location: montgomery tx
Posts: 65
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Re: Measurement of stock alternator housing
yo know you can reclock the alt if the ears dont line up and also change the pulley to your old pulley fyi
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