Rotors

D

darren paget

New member
Oct 28, 1998
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Is it really safe to drill three new holes in the face of the toronado
rotor so that you could bolt the GM hub to it? This seems like a pretty
scary thing to do. Do you have to somehow fill the other 4 holes in the
rotor or just leave them there????

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
>
> Is it really safe to drill three new holes in the face of the toronado
> rotor so that you could bolt the GM hub to it? This seems like a pretty
> scary thing to do. Do you have to somehow fill the other 4 holes in the
> rotor or just leave them there????

I found out last week that Zeb Frady sells new rotors for $118 - still
not cheap, but the best price I've found.

Patrick
- --
Patrick Flowers
Mailto:patrick

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
Autozone rotor is p/n 5512, $36.94.

Paul Bartz

From: Patrick Flowers [mailto:patrick]
Sent: Wednesday, June 23, 1999 10:59 AM
Subject: Re: GMC: Rotors

Is it really safe to drill three new holes in the face of the
Toronado rotor so that you could bolt the GM hub to it? This seems like a
pretty scary thing to do. Do you have to somehow fill the other 4 holes in
the rotor or just leave them there????

I found out last week that Zeb Frady sells new rotors for $118 - still not
cheap, but the best price I've found.
 
Darren:

The reason new bolt holes are required is that the original ones in the
rotor don't line up with our application. The new holes are midway between
the "as manufactured" ones, so there's plenty of material between. Unused
holes can be, but don't necessarily require filling, as far as I know.

Paul Bartz

From: Darren Paget [mailto:paget]
Sent: Wednesday, June 23, 1999 10:37 AM
Subject: GMC: Rotors

Is it really safe to drill three new holes in the face of the toronado rotor
so that you could bolt the GM hub to it? This seems like a pretty scary
thing to do. Do you have to somehow fill the other 4 holes in the rotor or
just leave them there????
 
Heinz:

No, it's the mid 70s front Toronado rotor, assume identical to the one used
by the GMC. The NAPA number for the 76-78 Cadillac El Dorado front and rear
rotor is 85518, ~ $75.00; GM number is 1490626.

Paul Bartz

From: heinz [mailto:heinz]
Sent: Wednesday, June 23, 1999 11:55 AM
Subject: RE: GMC: Rotors

>Autozone rotor is p/n 5512, $36.94.

Is that the one for stock brakes? and no drilling rfequired?

Heinz

>
> Paul Bartz
>
>From: Patrick Flowers [mailto:patrick]
>Sent: Wednesday, June 23, 1999 10:59 AM
>Subject: Re: GMC: Rotors
>

>Is it really safe to drill three new holes in the face of the Toronado
rotor so that you could bolt the GM hub to it? This seems like a pretty
scary thing to do. Do you have to somehow fill the other 4 holes in the
rotor or just leave them there????
>
>I found out last week that Zeb Frady sells new rotors for $118 - still
not cheap, but the best price I've found.
 
Paul, it is the " as far as I know " statement that always gets me worried. It
sounds good in theory, barely, but is it really safe? Does any one know for
sure? I am not too sure that I want to be the guinea pig on this one. I really
would love to save those dollars on rotors though

> Darren:
>
> so there's plenty of material between. Unused holes can be, but don't
> necessarily require filling, as far as I know.
>
> Paul Bartz
> Subject: GMC: Rotors
>
> Is it really safe to drill three new holes in the face of the toronado rotor
> so that you could bolt the GM hub to it? This seems like a pretty scary
> thing to do. Do you have to somehow fill the other 4 holes in the rotor or
> just leave them there????

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
> It sounds good in theory, barely, but is it really safe? Does any one
> know for sure? I am not too sure that I want to be the guinea pig on
> this one.

Darren...
I used to work in a plant where they were testing new designs of GAS
Centrifuge Rotors. One day I asked one of the engineers, "How long does
it take for one of those rotors to come apart, once it starts to
disintergrate??

He looked at me, smiled, and said, "About one and a half pants' full."

- --
"I do whatever my Rice Krispies tell me to..."
John said, err "Frosty the Snowman" said, from inside a 1974 Glacier.
 
Darren:

You wouldn't be the guinea pig. I know several GMCers who are using the
rotors, one for about four years, without any problems or worries about
impending failure. As I said before, there is plenty of material between
the original and new/additional holes (i. e. they fall midway between the
original one's).

Paul Bartz

From: Darren Paget [mailto:paget]
Sent: Wednesday, June 23, 1999 2:40 PM
Subject: Re: GMC: Rotors

Paul, it is the " as far as I know " statement that always gets me worried.
It
sounds good in theory, barely, but is it really safe? Does any one know for
sure? I am not too sure that I want to be the guinea pig on this one. I
really
would love to save those dollars on rotors though

> Darren:
>
> so there's plenty of material between. Unused holes can be, but don't
> necessarily require filling, as far as I know.
>
> Paul Bartz
> Subject: GMC: Rotors
>
> Is it really safe to drill three new holes in the face of the toronado
rotor
> so that you could bolt the GM hub to it? This seems like a pretty scary
> thing to do. Do you have to somehow fill the other 4 holes in the rotor or
> just leave them there????

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
seems like if a person had an extra old hub without the studs he could put
the new rotor on and than the old one on over it to use for a pattern for
drilling

>Darren:
>
>You wouldn't be the guinea pig. I know several GMCers who are using the
>rotors, one for about four years, without any problems or worries about
>impending failure. As I said before, there is plenty of material between
>the original and new/additional holes (i. e. they fall midway between the
>original one's).
>
> Paul Bartz
>
>From: Darren Paget [mailto:paget]
>Sent: Wednesday, June 23, 1999 2:40 PM
>Subject: Re: GMC: Rotors
>
>Paul, it is the " as far as I know " statement that always gets me worried.
>It
>sounds good in theory, barely, but is it really safe? Does any one know for
>sure? I am not too sure that I want to be the guinea pig on this one. I
>really
>would love to save those dollars on rotors though
>

>
>> Darren:
>>
>> so there's plenty of material between. Unused holes can be, but don't
>> necessarily require filling, as far as I know.
>>
>> Paul Bartz
>> Subject: GMC: Rotors
>>
>> Is it really safe to drill three new holes in the face of the toronado
>rotor
>> so that you could bolt the GM hub to it? This seems like a pretty scary
>> thing to do. Do you have to somehow fill the other 4 holes in the rotor or
>> just leave them there????
>
>--
> Darren Paget
> 76 Experimental
> Another Fab Day
> paget
>
>
>
 
Scott:

I checked with Bobby Moore about using an old, original rotor as a template.
He indicates that that is acceptable.

Paul Bartz

From: Adohen [mailto:Adohen]
Sent: Wednesday, June 23, 1999 12:30 PM
Subject: Re: GMC: Rotors

In a message dated 6/23/99 12:05:43 PM Eastern Daylight Time,

No, it's the mid 70s front Toronado rotor, assume identical to the one used
by the GMC. The NAPA number for the 76-78 Cadillac El Dorado front and rear
rotor is 85518, ~ $75.00; GM number is 1490626.

Hi Paul!
Thank you for the info! It seems like a month ago or so a post was made
about rotors. From what I'm reading from these posts today, there is a
rotor made that is same size as ours except it needs additional holes
drilled, Correct? How hard would it be to to turnover an old GMC rotor and
place it on top of the new Autozone rotor for $37.00, using the old one as a
template, using transfer punches to find centers, and then drill. Does this
seem possible? Or should this be done by someone with very sophisticated
machine tools?
Have you done this? If so, would you share how you did it?
 
Scott:

He does not e-mail service. If you want, call him: 502-964-6416.

Paul Bartz

From: Adohen [mailto:Adohen]
Sent: Friday, July 02, 1999 1:47 PM
Subject: Re: GMC: Rotors

In a message dated 7/2/99 1:34:33 PM Eastern Daylight Time,

I checked with Bobby Moore about using an old, original rotor as a template.
He indicates that that is acceptable.

Thanks Paul!

Is Bobby Moore on the GMCnet? E-mail address?
 
If none of the original five holes are used from the Toro rotor, is it
possible to make four new holes which do not interfere with the original
five? Has any one tried this maneuver?

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
Darren:

I just got off the phone talking to Bobby Moore. He believes it can be done
OK and is going to obtain a salvage rotor forom a Toronado and find out.
I'll let you know his results sometime in the future.

Paul Bartz

From: Darren Paget
Sent: 7/2/99 8:20 PM
Subject: GMC: Rotors

If none of the original five holes are used from the Toro rotor, is it
possible to make four new holes which do not interfere with the original
five? Has any one tried this maneuver?

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
Thanks Paul. Good work on this. If you come to N.M. I owe you a beer. Darren

> Darren:
>
> I just got off the phone talking to Bobby Moore. He believes it can be done
> OK and is going to obtain a salvage rotor forom a Toronado and find out.
> I'll let you know his results sometime in the future.
>
> Paul Bartz
>
> From: Darren Paget
> Sent: 7/2/99 8:20 PM
> Subject: GMC: Rotors
>
> If none of the original five holes are used from the Toro rotor, is it
> possible to make four new holes which do not interfere with the original
> five? Has any one tried this maneuver?
>
> --
> Darren Paget
> 76 Experimental
> Another Fab Day
> paget

- --
Darren Paget
76 Experimental
Another Fab Day
paget
 
Sorry no. I bought rotor and it is not possible to get 4 new holes w/o overlap

>If none of the original five holes are used from the Toro rotor, is it
>possible to make four new holes which do not interfere with the original
>five? Has any one tried this maneuver?
>
>--
> Darren Paget
> 76 Experimental
> Another Fab Day
> paget
>
>
>
 
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