'58 270hp Generator

[Ted S.]

A couple of questions on generators. Did all of the tach drive generators for '58 use the 3 5/8" pulley regardless of HP? Secondly what is the difference in the end plates between the 2041 and 2043? Thanks, Ted

[Joe L.]

Re: '58 270hp Generator

A couple of questions on generators. Did all of the tach drive generators for '58 use the 3 5/8" pulley regardless of HP? Secondly what is the difference in the end plates between the 2041 and 2043? Thanks, Ted

Ted-----


The following is based on GM specs and not personal observation or experience:

As far as I can tell, the generator pulley/fan assembly was the same for all 1958 tach drive generators. A 3-5/8" pulley/fan assembly of GM #3750545.

FUNCTIONALLY, the generator end plates, both commutator end and drive end, were the same for the '041' and '043' generators. The commutator end was GM #1934131 and the drive end was GM #1933109. There may be some "nuance" differences, though.

[Brad K.]

Re: '58 270hp Generator

Thanks for the question about the generators, Ted. This question is for Joe Lucia.....I have two different aluminum drive end plates for the C1 generator sitting before me. My questions are these:

1) One of them has a GM number on it....1941168. It has a centerline distance of 3 1/2" (between the generator shaft center and the center of the mounting boss). It has an overall diameter of 5 1/2"(the largest round part). What application was this one intended for?
2) The other one does not have a part number on it, although it does have the 1/2" diameter round Delco-Remy insignia on it. Centerline distance....3 1/4" and overall diameter....5" Are either one of these aluminum end plates correct for the 043 (270hp) generator?

I've heard that the 043 generator sits 1/4" higher than the base engine which would make the 1941168 end plate correct. However I was recently told that it is not correct. What's the real scoop??

[William C.]

Re: '58 270hp Generator

I believe the shorter version is used on pass car with power steering, and the longer version is the Corvette piece.

[Joe L.]

Re: '58 270hp Generator

Thanks for the question about the generators, Ted. This question is for Joe Lucia.....I have two different aluminum drive end plates for the C1 generator sitting before me. My questions are these:

1) One of them has a GM number on it....1941168. It has a centerline distance of 3 1/2" (between the generator shaft center and the center of the mounting boss). It has an overall diameter of 5 1/2"(the largest round part). What application was this one intended for?
2) The other one does not have a part number on it, although it does have the 1/2" diameter round Delco-Remy insignia on it. Centerline distance....3 1/4" and overall diameter....5" Are either one of these aluminum end plates correct for the 043 (270hp) generator?

I've heard that the 043 generator sits 1/4" higher than the base engine which would make the 1941168 end plate correct. However I was recently told that it is not correct. What's the real scoop??

Brad----


As I mentioned, my C1 expertise and knowledge is very limited. However, from what I can find, the GM #1933109 drive end plate was used for the GM #1102043 generator used on Corvettes. The GM #1941168 end plate was used for GM #1102114, 1102115, and 1102174 generators which were not used on Corvettes.

[Ted S.]

Picture showing differnce

Here's a picture I pulled off off the old NCRS site some time ago showing the difference in mounting. I believe it was posted by Roy Braatz so maybe he'll chime in here.

[Jack H.]

Re: '58 270hp Generator

I believe the front end frames are the same but the rear end frames are different. The various JG books do a pretty good job of defining the difference between Corvette and passenger car rear end frames by calling out the center-to-center hole dimensions. Plus, judges use the old 'finger' test with the generator installed.

But, looking at side by side pictures of the raw rear end frames gives you that hot kiss at the end of a wet fist distinction.

One pix shows the two frames laid on top of each other with the passenger car version exhibiting its longer profile. The other pix shows the frames side by side where the difference in geometry is highlighted...note the Corvette frame has the two casted islands virtually touching while the passenger car version has a distinct ismus connecting the two islands.

[Roy B.]

Re: Picture showing differnce

Here's a picture I pulled off off the old NCRS site some time ago showing the difference in mounting. I believe it was posted by Roy Braatz so maybe he'll chime in here.

Ted
Thanks many years ago I wrote about that ,that's why judges today use the finger test . The pic. Is right ,you cant put your finger between the plates housing and body if it's a correct Corvette . Plus Corvette "front plate" don't have stronger fins "back side" in the plate that car Gen. Front plate will. Again years ago when I judged 56 up many owners had a car power steering Generator installed not Corvette thinking they were the same .WRONG !! but people still buy and use them . I dont have a pic. right now to show.

[Tom D.]

Re: '58 270hp Generator

If the front plate is diff., can you tell a Corvette front plate from a pass-car one... when installed?
Thanks
Tom D.

[Roy B.]

Re: '58 270hp Generator

If the front plate is diff., can you tell a Corvette front plate from a pass-car one... when installed?
Thanks
Tom D.

We're talking C1 right? Yes it's obvious when in a Corvette that the FRONT plate is ether CAR or Corvette with out using the finger test. The finger test is for the rear plate. If some one could post a pic. I could show the difference 56 to 61 only .

[Mike B.]

Re: '58 270hp Generator

Jack,

How could the front end frames be the same if the distance from the centerline of the armature to the centerline of the mounting eyes are different in Corvette vs. passenger car? One would think that the front distance must match the rear so that the generator remains parallel to the axis of engine rotation.

I always assumed that the above is true (but I never checked). I have a collection of frames and carcasses and will look tonight. I have been searching for a shorter Corvette end frame for some time to replace one that cracked. They are getting tough to find whether on a junk generator or as a sole piece.

Mike

[Tom D.]

Re: '58 270hp Generator

Good point.
TD