3000 RPMs at 70- a little much, 3.7 final drive ?

[jim kanomata1]

Johnny,
Being an Degreed Aeronautical engineer meas little.
The face area and length has everything to do with wind drag,
Ask a search engine.

On Mon, Nov 30, 2020 at 6:25 AM 78gmcroyale via Gmclist <

> I have the 403 engine, 3.70 final drive and run 245 tires. At 70 mph I'm
> right at 3,000 rpm. The 403 just purrs right along and seems very content
> there.Sent from my U.S.Cellular© Smartphone
> -------- Original message --------From: dave silva via Gmclist <
> gmclist> Date: 11/30/20 6:27 AM (GMT-06:00) To:
> gmclist Cc: dave silva Subject: Re:
> [GMCnet] 3000 RPMs at 70- a little much, 3.7 final drive ? So there is
> consensus among some of you that 3.7 is the optimal all-around gear ratio?
> Help me understand.If it's optimal for a 26 footer pulling a car up and
> down the West Coast how is not overkill for a 23 footer pulling nothing?
> Isn't that like a 6,000 lb difference? -- Dave & Ellen Silva1972 Revcon
> Olds 455, toro drive train. All
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502

 

[johnny]

I'm not a degreed aeronautical engineer, no idea how that got into the discussion. (Actually, I'm not a degreed anything). I just wondered when we
get past about 20 feet, how three feet in length would make a difference is all. I still do

--johnny

--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell

 

[jim kanomata1]

I learned that from a practical Aeronautical Engineer that reviewed a basic
rule we touched in college,but did not remember.
Johnny, I was in no way trying to be a smart ass.
I think there are basic aeronautical books that explain why the longer body
with same frontal area will produce less drag.
That was why we chose the 26 foot for the Speed record at Bonneville Salt
Flats.

On Mon, Nov 30, 2020 at 4:40 PM Johnny Bridges via Gmclist <

> I'm not a degreed aeronautical engineer, no idea how that got into the
> discussion. (Actually, I'm not a degreed anything). I just wondered when
> we
> get past about 20 feet, how three feet in length would make a difference
> is all. I still do
>
> --johnny
>
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502