| [GMCnet] cad 500 vs 455 performance ? [message #92346] |
Sun, 18 July 2010 05:49 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma:
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Senior Member |
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I always find these ad-hock performance reports troubling ( I know there is
some JWID, and I own it , therefor , I love it) but the test results don't
seem to support these conclusions ;>)
*ad-hock*
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The Cad definitely has more torque than the Olds. Even with a 23', I've
always "known" that I was driving a heavy vehicle "by the seat of my pants".
With the Cad, that feeling is gone -- throttle response is that much
better, even with the same EFI on both engines.
At cruising speed, towing, the difference is not as noticeable. There are
no serious hills between Dillard and here, but a lot of them steep enough to
drop the ElectroMotor II CC set speed by 2-3 mph while towing a 3600-3700#
CRV. John Richardson, with his 26' Avion, not towing had no trouble staying
right with me. kenH
.
.
.
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*Dyno tests*
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I was digging through some old GM test data and thought I would share the
following:
*Olds 455* test data with an uncertain pedigree (Toro or not? Test
conditions?) and it showed a torque at 2800 and below of about *398*. No
data below 2000, but other tests implied a peak torque at 1200 to 1600 rpm.
Peak hp was 234 at 3600.
*Cadillac 500 EFI* - peak torque *395* at 1200 and 1600 rpm. Peak hp 225 at
3600. The engine was knock limited and spark was retarded about 10 degrees
from MBT at most rpms. Both of these are consistent with other big GM
engines built at the time(except for the knock-limited part). Max
torquewas always below 2000 rpm and peak hp was never above 4000.
That's not
counting performance engines like the Chevy 427 or the Chrysler Hemi, of
course.
Olds 350 EFI (Cadillac Seville) - peak torque 290 at 1200, peak power 190 at
4400 and still rising. Not knock limited.
If the Cad 500 were tested on today's fuels would it be knock-limited?
Don't know.
.
.
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Hopefully this data will be useful to somebody. GaryC
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I love, ( I do it because I can), but it would be hard to make an informed
decision on these engines based upon the reported performance vs the dyno
test data.....
gene
--
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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