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alternator for an FC
Posted by: Intrinsic ()
Date: November 06, 2018 09:36AM

Hello, my FC came with an alternator conversion, using a DELCO 1100639 37 amp alternator. This alternator seized and sheared off the key allowing the fan and pulley to spin freely on the shaft.

As I have to replace the alternator anyway, I would like to upgrade to a larger amperage output.

What alternator do you recommend that I use? Also, do I need to scavenge any parts from my old alternator?

Thanks

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Re: alternator for an FC
Posted by: cnicol ()
Date: November 06, 2018 09:53AM

You can easily upgrade to a 55 amp alternator that uses the same regulator and wiring OR you can install an internally regulated "7127" 55 amp alternator that will require wiring revision to eliminate the current external alternator.

In either case, retain the special CCW Corvair fan and the alternator's entire front housing.

While many here will prompt you to install the internally regulated alternator, since you already have working wiring and regulator I'd suggest sticking with that system. As an added benefit, you won't have any issues modification of "GEN" light circuit that comes with the addition of the internally regulated type.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: alternator for an FC
Posted by: aircooled6 ()
Date: November 06, 2018 10:07AM

Since the local parts person can likely only function with a vehicle model and year, I suggest 1970 Chevy Impala, V8 (350) with A/C. That will get you the standard 62 amp alternator with the right plugs and holes. Then, as Craig mentions above, you'll have to partially disassemble it to swap the Corvair Front Housing and Fan/pulley. Not difficult, but takes a few minutes. That big nut is Right Hand Thread, by the way.
Try NOT to remove the shaft from the rear housing while you are doing this, since the brushes will pop loose and some of the needle bearings might fall out of place. Again, both fixable, but aggravating. Guess how I know this.

Everett Wilson
North Richland Hills TX
(Now, South of 820!!)
64 Greenbrier 110 with 95 heads/PG

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Re: alternator for an FC
Posted by: 66vairman ()
Date: November 06, 2018 10:29AM

intrinsic - because someone reworked your wiring for the externally regulated alternator it would be easier to replace with the same style 10DN, but with higher amperage as suggested in posts here.

When converting an FC or EM from a generator to an alternator rewiring for the internally regulated 10SI is easier, but again somebody has already revised your wiring for the externally regulated 10DN.

As noted you must use the Corvair specific front alternator housing frame and fan/pulley on either the 10DN or 10SI units.

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Re: alternator for an FC
Posted by: Lane66m ()
Date: November 06, 2018 02:45PM

Not a big deal. Get the 62 amp alternator and the jumper plug for the voltage regulator connector. Mod the alternator as instructed above and install jumper plug and away you go. You can always revert back to the old style alternator at anytime.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: alternator for an FC
Posted by: 66vairman ()
Date: November 06, 2018 05:20PM

Lane66m Wrote:
-------------------------------------------------------
> Not a big deal. Get the 62 amp alternator and the
> jumper plug for the voltage regulator connector.
> Mod the alternator as instructed above and install
> jumper plug and away you go. You can always
> revert back to the old style alternator at
> anytime.

True, but the 10SI (internally regulated) work best with a by-pass resistor installed at the warning lamp to supply adequate "field" amperage during start up to energize the alternator. The 65 and later cars had a 10 ohm wire parallel with the warning bulb. I use a 10 ohm 50 WATT wire wound resistor with holes in the case for mounting. The wattage is overkill, but if there is a short in the wiring the resistor won't set anything on fire.

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Re: alternator for an FC
Posted by: Lane66m ()
Date: November 06, 2018 06:30PM

Not true, we just found out that on the kit I built for a gentleman up in Ohio. He had to pull the resistor out to get the light to work right.

Here is the link where you can read about it. I will be removing the resistor from my Greenbrier's wiring after I start it up following its mod with the same resistor. Just want to prove same condition on my Vair also.

[corvaircenter.com]

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp





Edited 1 time(s). Last edit at 11/06/2018 06:31PM by Lane66m.

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Re: alternator for an FC
Date: November 07, 2018 04:59AM

Considering that the internal diameter of the fan was likely damaged (enlarged) you will likely need to source another so that it fits the new alternator shaft as well.

Possible someone local to you could supply one, or Vendors advertising in the left column usually have them as well.

Please create a signature line in the Control Center to let folks know your name, location, and year/models of your Corvairs. thumbs up


Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 140 Corsa ~ ~ 1965 Monza 140/4 'Vert Sierra Tan/Fawn ~ 1964 Monza 'Vert (SOLD) ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 Evening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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Re: alternator for an FC
Posted by: Intrinsic ()
Date: November 07, 2018 05:02AM

Hello everyone, thanks for all of the excellent discussion. we just purchased our Rampside last week, literally. Its our first Corvair, so everything is a learning experience. I have lots of experience with air cooled Type III VW's but I am learning that GM is a different world.

To add some background,

The alternator conversion was done by the previous owner, I dont see any sign of the original regulator. There are some small hand made wires going to the alternator plugs which dont seem original.

I get a alternator warning light when I turn the key, but I did not get a warning light when the alternator seized. This leads me to believe that my alternator wiring may not be entirely correct.

I am tracing the wiring harness, and removing old cut wires and have discovered 6 wires which dont connect to anything on one end. I am also working my way around the truck to improve the light fixture grounds, as all of the lights were different intensities.

Thanks again for your guidance, I will shop my FLAPS for a new alternator, and see if the fan and pulley are salvageable from the old one.

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Re: alternator for an FC
Posted by: Lane66m ()
Date: November 07, 2018 06:05AM

Intrinsic:

The wiring diagram you see on the discussion I linked is a good one to follow. Just ignore the diode. The circuit breaker is a good safety device if you want one that can act as a disable device also. If you want the list of parts I made up for the diagram, PM me your email address.

The following link has photos showing how I set up my Greenbrier.

[corvaircenter.com]

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: alternator for an FC
Posted by: joelsplace ()
Date: November 07, 2018 07:06AM

I'll bet everyone's answers have been off because of your original description. Did you get that info from the end frame with the 2 main mounts and assume it was correct? That is the part you keep from the Corvair alternator to convert to a later style. A picture would tell us what it is immediately. If it has a plug with 2 parallel blades it is the one you described which is externally regulated. If it has 2 inline blades it is already a 10SI internally regulated alternator.

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Re: alternator for an FC
Posted by: cnicol ()
Date: November 07, 2018 07:15AM

^^^ What he said. The first post included a part number and amp-rating for the original, externally regulated alternator.

A photo of the installation for positive ID would be most helpful.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: alternator for an FC
Posted by: Lane66m ()
Date: November 07, 2018 07:24AM

In original post he said it was a 37 amp alternator, which should have a regulator. But a later post he says there is no sign of original regulator.

So that is a strange installation or it is a alternator not requiring a regulator.

Photos of the alternator plug and connection end of alternator would be helpful. Along with a photo of the wiring under the battery where the regulator should be mounted.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: alternator for an FC
Posted by: steve c goodman ()
Date: November 07, 2018 07:29AM

Intrinsic: You would help yourself if you added a
signature line under your posts with at least first
name/location and year of FC. You should also look
for a local club to join plus CORSA. Local owners
plus someone reading the forum call be of great help
when you first get into the cars.

CORSA: www.corvair.org

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: alternator for an FC
Posted by: Timothy Shortle ()
Date: November 07, 2018 07:32AM

All charging systems require a voltage regulator. Even if it is inside the alternator case it is still a voltage regulator. I agree with Craig, show us some pictures. BTW, in all the conversions I have done from generator to alternator, I never monkeyed with a diode(?) or did anything with a resistor(what resistor?).

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Re: alternator for an FC
Posted by: MattNall ()
Date: November 07, 2018 08:05AM

Timothy!! check the '65-9 diagrams... It's there in case the bulb burns out...





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: alternator for an FC
Posted by: Timothy Shortle ()
Date: November 07, 2018 08:33AM

Matt, I never checked the 65-69 wiring diagrams when I was converting my Corvairs from generators to alternators.

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Re: alternator for an FC
Posted by: 66vairman ()
Date: November 07, 2018 09:12AM

MattNall Wrote:
-------------------------------------------------------
> Timothy!! check the '65-9 diagrams... It's there
> in case the bulb burns out...

Tim - Matt means the "wire" is there (about 10ohms), but there is NO diode for the alternator in the harness. Amazing that bad information about the diode won't go away. I think folks confused the Corsa temp light/buzzer diode in the harness with the GEN light.

Al Lane. As Matt said the GEN lamp parallel wire resistance (not in series as sometimes incorrectly done) serves TWO purposes. The 10ohm wire in parallel with the bulb allows more amperage to be conducted to the alternator energizing circuit during startup AND it also allows the alternator to turn on if the bulb burns out.

Will the internally regulated alternator work WITHOUT the parallel resistance at the bulb? Yes it can, but is not reliable and can require the engine to reach 1,500 to 2,000 RPM to "self energize" the alternator (a common complaint about 1 wire alternator conversions).

Note: ALL this information is accessible in the GM or DELCO manuals and online.

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Re: alternator for an FC
Posted by: Timothy Shortle ()
Date: November 07, 2018 11:22AM

I have never seen a 65-69 Corvair with a generator. Still hoping this person will show us what he is working on. Also I would suggest he contact a known reputable Corvair specialist over going to a FLAP store. We have many and some have even been on this topic with suggestions.

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Re: alternator for an FC
Posted by: joelsplace ()
Date: November 07, 2018 11:41AM

I'm thinking about converting some of my LMs to generators. I have lots of generator adapters and regulators.

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