[GMCnet] Really ony 4 quarts of oil??
Keith Vasilakes
I've read that the 455 only holds 4 quarts (+ filter).
the 454 in my Class C held 8.
--
Keithhttp://gallery.corvettengineering.comhttp://gallery.corvettengineering.com/thumbnails.php?album=17http://gallery.corvettengineering.com/thumbnails.php?album=25
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Wally Anderson
Keith V wrote on Sun, 12 October 2008 19:41
> I've read that the 455 only holds 4 quarts (+ filter).
> the 454 in my Class C held 8.
Supposed to be 5 qts to fill with a new empty filter. Ken Henderson has an excellent writeup on how the oil level in the pan changes with different amounts of oil in it and how the dipstick should read.
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3942&ppuser=40
HTH
--
Wally Anderson
1975 Glenbrook
Omaha Nebraska
Greater Midwest Classics
Ken Burton
Just changed mine today. It takes 5 quarts with filter to fill it up.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
Steve Southworth
Keith V wrote on Sun, 12 October 2008 19:41
> I've read that the 455 only holds 4 quarts (+ filter).
> the 454 in my Class C held 8.
It holds 6 but one quart is isolated in the front pan ahead of the axle bump-up and will not drain out. So as stated it is actually 4 plus 1 for the filter. No biggie.
--
Steve Southworth
1974 Glacier TZE064V100150
Palmyra WI
Jim Kanomata
better calibrate the stick with the tube.
> --
> Jim Kanomata
> Applied/GMC
> ji...@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
Rick Denney
> I've read that the 455 only holds 4 quarts (+ filter).
> the 454 in my Class C held 8.
The U-shaped pan hides a quart in the forward section that is quite
difficult to drain out. So, when you put five quarts in the engine
(including what goes in the filter), the engine really has six quarts
in it.
The book suggests putting six quarts in the engine after a filter
change, but experience indicates that this will bring the oil level
too high, causing excessive windage and blowing the first quart by in
a couple of hundred miles. For our application with a working redline
well below 4000 RPMs, I have no worries about running the pan dry,
even if a quart low.
Rick "who replaced the filter, put in five quarts, and noted the level
on the stick as 'full'" Denney
'73 230 Ex-Glacier "Jaws"
Northern Virginia
Jim Kanomata
I had to put in my 2 bits.
--
Jim Kanomata
Applied/GMC
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
Keith Vasilakes
Thanks,
I ask because I finally got the engine back together after redoing the heads, filling the intake, new valve covers and rebuilding the distributor. (pant...wheeze)
I needed to refill the crankcase but the machine is on a slope so I couldn't trust the dipstick
I looked at kens page and it looks like any more oil and you would definitely be into the crankshaft. Of course that's static, not with a couple of quarts pumped into the top of the engine like there would be while running. ( then again, I'm pretty sure the oil in the foreword section would be blown out from the windage)
So I guess I'm not convinced that 5 quarts are right for a running engine...But it should be enough esp with the anecdotal evidence of oil consumption with more oil.
--
Keithhttp://gallery.corvettengineering.comhttp://gallery.corvettengineering.com/thumbnails.php?album=17http://gallery.corvettengineering.com/thumbnails.php?album=25
Emery Stora
On Oct 13, 2008, at 7:57 AM, Keith Vasilakes wrote:
>
>
> Thanks,
> I ask because I finally got the engine back together after redoing
> the heads, filling the intake, new valve covers and rebuilding the
> distributor. (pant...wheeze)
> I needed to refill the crankcase but the machine is on a slope so I
> couldn't trust the dipstick
>
> I looked at kens page and it looks like any more oil and you would
> definitely be into the crankshaft. Of course that's static, not with
> a couple of quarts pumped into the top of the engine like there
> would be while running. ( then again, I'm pretty sure the oil in the
> foreword section would be blown out from the windage)
>
> So I guess I'm not convinced that 5 quarts are right for a running
> engine...But it should be enough esp with the anecdotal evidence of
> oil consumption with more oil.
Dick Patterson has given several great seminars on oil and the GMC
Motorhome at the GMCMI conventions.
He has stated that it is very common for the GMC 455 engine to be
filled to the 5 quart level and then quickly "burn off" 1 quart but
then hold well at the one quart low point of the dipstick. He
explains that the level in the crankcase is such at when above the 4
quart level there is a lot of churning of the oil by the crankshaft
and the oil mists and gets sucked up into the PCV system and goes out
through the carb.
He also has reference in one of his presentations to the Chevrolet
Motor Home Chassis Service Guide as published by Chevy Trucks. It
states:
"Chevrolet has determined that there is not a durability problem with
operating the seven (7) quart system down as much as two (2) quarts."
Although this pertains to a 454 engine, Dick has stated that this also
applies to the 455 which seems to run very well at the "quart low"
mark on the dipstick.
Emery Stora
77 Kingsley
Santa Fe, NM
Neil
Hello,
I've been reading the past posts on oil dipstick calibration and it seems most of the info has been centered around the 455. I'm attempting to calibrate my dipstick and I have a 403. My question is whether the oil pan on the 403 is the same as the one on the 455. I ask so that I can know if I, too, have a quart in the front "bump" of the oil pan that won't drain (without coaxing). I know that mine has a front "bump" but am unsure if it retains the same volume as the 455's.
Neil Dethloff
1978 GMC Eleganza II
Gordon "Tin Gerbil" & "Chicken Coupe"
This article I found does not address your point specifically, but it is
a good read on the reasons not to run too much oil;
There is some great confusion in this area, the proper oil level and how
it is determined. Unfortunately the only source of information or
guidelines are right in the manufactures descriptions and in most cases
advertised incorrectly. Just because a manufacture rates their oil pans
at 7, 8 or 9 quarts does not mean that the user should run 7, 8 or 9
quarts in it. The oil pan rating in the description is intended to show
the capacity of how large the pan is. This method of advertising is
easier than listing the dimensions of the exact pan being sold, although
very misleading in a guide as to the capacity or the amount of oil to
install in that pan. Deeper than stock depth, or larger capacity oil
pans are intended to add additional space between the oil level as it
sits in the pan, and the crankshaft. By increasing that space you are
assisting the engine in two critical areas. The first would be to reduce
windage, which is the tornado effect of air getting thrown down into the
top of the oil as it sits in the pan when the crankshaft is turning.
Windage will create a disturbance in the oil and churn it or froth it,
and the further the oil sits in relation to the crankshaft the less
windage it will see. The second area of concern is the reduction of air
space in the engine. Not only does your engine get effected by windage
from too much oil, but it also gets effected by the reduction of the
cubic inches of air space in your engines crankcase, when the oil level
is to high. Your engine always produces crankcase pressure (air getting
by the rings during its compression cycle) regardless and it is up to
you to give this air that is passing by the rings a place to go. By
running too much oil your reducing cubic inches of air space, and by
doing so your putting additional stress on the engines gaskets.
Excessive crankcase pressure which is usually caused by too much oil is
the most common cause of oil leaks at the rear main seal, oil pan
gaskets, and valve cover gaskets. It is also not uncommon for these Olds
engines to blow the dip stick up and release the pressure which causes
oil to spray onto your engine compartment and down the side of your
engine (most mistake this for a valve cover gasket of leaky oil filter
or housing gasket). By running the correct amount of oil in your pan
will enhance horsepower, torque and reduce oil leaks. Horsepower and
torque is enhanced because the pressure is reduced in the crankcase and
is also reduced on the under side of the pistons allowing the engines
reciprocating assembly (crank, rods pistons and rings) to accelerate
faster. The ultimate goal is to keep your oil pumps pick up safely
covered and that usually means no more than 5.5 to 6 quarts total
(includes large conventional oil filter) for a pan with a sump area in
it such as the Moroso or Milodon 8 and 9 inch deep pans. Flat bottom
non-sump pans are application specific and not intended for all
applications even if you have the room for it.
Larry
JFYI
When I took the 455 out of my coach (to replace it with a 500), I set the empty pan on the ground and leveled it up with 2X4's and wedges. I then poured *almost* one full quart of water into the front "bump" of the 455 pan.
Larry (who's 500 takes 7 quarts with filter and oil cooler) Weidner
aw geese...now Rick's got me do'in it... :x
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
Jim Kanomata
think were 't compare the none front wheel drive to the front wheel
drive. Go under and look . Bull S--t is cheap.
--
Jim Kanomata
Applied/GMC, Fremont,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502