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| Re: 455 + 403 hp & torque specs [message #115161 is a reply to message #115158] |
Tue, 15 February 2011 19:51   |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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Senior Member |
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I drove one with a 3.07,,,dog. Mine has a 3.46. Nice with the 403. Better with a 507. I think Jims 3.55 would be best all around. If you were to tow some thing heavy,,,,3.73.,,,,PL
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| Re: [GMCnet] 455 + 403 hp & torque specs [message #115190 is a reply to message #115158] |
Tue, 15 February 2011 22:10 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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here are some data on torque
http://gmcmotorhome.info/engine.html#403_VS_455
gene
On Tue, Feb 15, 2011 at 5:49 PM, Gord Hubbell <g.r.hubbell@gmail.com> wrote:
>
>
> Hi all,
> I've found through the brochures, the first couple of years list the 455
> with 212 hp @ 3400 rpm and 344 ft-lbs @ 2400.
>
> I can't seem to see anything about the 403.
>
> I'd appreciate any numbers and comments regarding how people feel the power
> and torque originally mentioned made the motorhome roll along, and if
> improvements have been made, what was done and what the results were?
>
> I know a lot of people seem to have chosen to change final drive ratios...I
> believe for towing reasons more than anything?
>
> Fuel mileage seems quite consistant...around 10 to 14mpg, has anyone made
> any dramatic improvements to this?
>
> Any info or opinions would be fantastic.
>
> Thanks everyone,
>
> Gord
> _______________________________________________
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] 455 + 403 hp & torque specs [message #115391 is a reply to message #115175] |
Thu, 17 February 2011 17:26 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Gordon, those of us with the 403 that are in good condition find that the
engine will consistently do a little better on fuel than the 455. Comparing
carb engines. The 403 develops it's maximum torque at a higher RPM than the
455 does, and doesen't like to pull much below 2000 RPM. The gearing changes
allow the 403 to run at a higher RPM range where it performs almost on a par
with the 455. A few tweaks in performance will pay large benefits with the
403 and the 455 as well. If you are really thirsty for more performance,
engine swaps to a 500 cubic inch Cadillac are possible using mostly Cad
Eldorado parts. No substitute for cubic inches or cubic dollars for that
matter. The neat thing about these GMCs is that there is no wrong way only
different ways. Boys & their toys, right<Grin>
Jim Hupy
Salem, Or
78 GMC Royale 403 with a carb and 3:70 Gears
On Tue, Feb 15, 2011 at 7:12 PM, Gordon R. Hubbell <g.r.hubbell@gmail.com>wrote:
> Awesome - thanks very much Emery - great specs and a great article, and
> Paul, thanks very much for the 'real life' opinions - nothing beats those!
> :-)
>
> I find it fascinating (according to those numbers), that overall the
> figures
> generally dropped year after year - and fuel mileage as well. I guess the
> 403 although smaller was perhaps over-worked or unable to perform under the
> majority of conditions and with the given gearing most efficiently? Lots
> to
> learn and study.
>
> Much appreciated - thanks again Gents!
>
> Gord
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Emery Stora
> Sent: Tuesday, February 15, 2011 9:14 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] 455 + 403 hp & torque specs
>
>
> Gord
>
> I had once gotten some info from Dick Paterson and passed it on to Billy
> Massey who posted it to his site. http://www.bdub.net/OldsEngineSpecs.pdf
> Page 2 has the hp and torque figures.
>
> Torque is a measured value. Horsepower is a computed value using the
> relationship between hp and torque. The peak torque occurs at a different
> RPM than the peak HP. More info on that is available in an article I wrote
> several years back which is posted on the GMCWS site:
> http://www.gmcws.org/techcenter/01-03tc32.html
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
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