Home » Public Forums » GMCnet » [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission.
| [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340407] |
Sun, 27 January 2019 11:26  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Think of it this way. You have a 10 speed bike. You shift to a lower ratio. So that it takes less effort for you. The bikes engine. To get down the road. Or up that hill. Thus you. The bikes engine will run cooler. And not be so tired at the top of the hill. The 3:70 FD is an outstanding improvement to any GMC. Towing or not. Mileage goes up because your running a higher intake vacuum. Less load on pistons/bearings. And the water pump is getting more water to the radiator. The same situation for the transmission. Runs cooler with less load. More fluid to the trans cooler. If your running a power drive chain in the transmission. The trans will not get the less load/heat reductions that the 3:70 FD offers. And finally as to transmission loading on steep climbs. NEVER use more then half throttle. NEVER. And except the speed you get.
There is a very old thought that running an engine at higher RPM's is hard on your engine. That idea died in the mid 50's. When compression ratio's went up. Piston technology made great strides. Aluminum pistons were replacing the heavy cast iron ones of the day. Engine lubrication system were greatly improved. Pulling a heavy load like are GMC's at low RPM's. Puts more load on the engine pistons, and bearings. Reduce the load/heat on your engine, and trans. Don't be overly concerned about running the RPM's to the 4000, to 4500 point. I've been in the mountains with a GVW of 17,000 lbs. That's the weight on one and a half GMC's. Using a perfectly stock 403. No headers, no 3 inch exhaust, and no extras engine venting. Bob Dunahugh
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340432 is a reply to message #340407] |
Sun, 27 January 2019 23:30  |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Bob,
At 4500 RPM in second gear, you should be close to 65 MPH with a 3.70FD.
At 4000 RPM in second gear, you should be close to 58 MPH with a 3.70FD.
On Sun, Jan 27, 2019 at 9:26 AM Bob Dunahugh wrote:
> Think of it this way. You have a 10 speed bike. You shift to a lower
> ratio. So that it takes less effort for you. The bikes engine. To get down
> the road. Or up that hill. Thus you. The bikes engine will run cooler. And
> not be so tired at the top of the hill. The 3:70 FD is an outstanding
> improvement to any GMC. Towing or not. Mileage goes up because your running
> a higher intake vacuum. Less load on pistons/bearings. And the water pump
> is getting more water to the radiator. The same situation for the
> transmission. Runs cooler with less load. More fluid to the trans cooler.
> If your running a power drive chain in the transmission. The trans will
> not get the less load/heat reductions that the 3:70 FD offers. And finally
> as to transmission loading on steep climbs. NEVER use more then half
> throttle. NEVER. And except the speed you get.
> There is a very old thought that running an engine at higher RPM's
> is hard on your engine. That idea died in the mid 50's. When compression
> ratio's went up. Piston technology made great strides. Aluminum pistons
> were replacing the heavy cast iron ones of the day. Engine lubrication
> system were greatly improved. Pulling a heavy load like are GMC's at low
> RPM's. Puts more load on the engine pistons, and bearings. Reduce the
> load/heat on your engine, and trans. Don't be overly concerned about
> running the RPM's to the 4000, to 4500 point. I've been in the mountains
> with a GVW of 17,000 lbs. That's the weight on one and a half GMC's. Using
> a perfectly stock 403. No headers, no 3 inch exhaust, and no extras engine
> venting. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340468 is a reply to message #340432] |
Tue, 29 January 2019 11:26 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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My main concern with revving a 455 at higher rpms for any length of time is it has a tendency to starv the oil pan of oil. The oil tends to linger in the rocker arm area under the valve covers unless the engine is modified so the oil will return to the pan sufficiently to keep the oil pump in the oil. A high volume pump will even amplify the problem a bit more. This is the only reason I would not want to run a 455 at 4500 rpm climbing a long grade for any length of time otherwise it should not be a concern.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340469 is a reply to message #340468] |
Tue, 29 January 2019 12:15 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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I would like an intelegent PSI reading oil pressure gauge that would alarm
if the oil pressure dropped below a setpoint for a given RPM range. I think
that would be an ealier way than to have an oil level reading (electronic
dipstic) that would be acurate while driving up and down hills at highway
speeds.
On Tue, Jan 29, 2019 at 9:56 AM roy keen wrote:
> My main concern with revving a 455 at higher rpms for any length of time
> is it has a tendency to starv the oil pan of oil. The oil tends to linger in
> the rocker arm area under the valve covers unless the engine is modified
> so the oil will return to the pan sufficiently to keep the oil pump in the
> oil. A high volume pump will even amplify the problem a bit more. This is
> the only reason I would not want to run a 455 at 4500 rpm climbing a long
> grade for any length of time otherwise it should not be a concern.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
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*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| [GMCnet] New Subscriber, test message and brief intro [message #340477 is a reply to message #340469] |
Tue, 29 January 2019 15:52 |
Stu Rasmussen
Messages: 130
Registered: January 2019
Location: Silverton, OR
Karma: 0
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Greetings to the list.
New list member, very recent GMC motorhome purchaser; thought it might
be a good idea.
'Good idea' - subscribing to the list, definitely - purchasing the
motorhome, we shall see.
Short story: Have had romantic notions about 'life on the road', scanned
craigslist relentlessly for something suitable, found a 'fixer upper'
GMC, made the deal and buyer's remorse has not yet set in.
Rig is a 1974 Eleganza that the two previous owners had the same notion
I did and apparently ran out of time / money / inspiration / passion. My
turn now.
It runs and drives mostly, the inside is mostly gutted and many but not
all pieces are still with it.
I need another project (like I need an additional hole in my head?) but
this was something I thought would be fun and the better half didn't
dismiss it as 'ugly' right out of the box. So there's a glimmer of hope.
That's my story for now.
Stu
Silverton, Oregon
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Stu Rasmussen W7QJ
Silverton, OR
'77 Birchaven
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340479 is a reply to message #340477] |
Tue, 29 January 2019 16:44 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Stu,
Welcome aboard. You'll find here 'most any knowledge you may need to help
you with your project.
As you consider things to be done, consult here to be sure you're going the
best direction. As you'll see from my signature block, my GMC has lots of
"upgrades". Most of those were done AFTER I'd done the "by the book"
repairs. Some, if not most of them, could have been done in the first
place more cheaply than they were. Here, you can get those ideas and
follow them or not.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com
On Tue, Jan 29, 2019 at 4:53 PM Stu Rasmussen (97381.com)
wrote:
> Greetings to the list.
>
> New list member, very recent GMC motorhome purchaser; thought it might
> be a good idea.
>
> 'Good idea' - subscribing to the list, definitely - purchasing the
> motorhome, we shall see.
>
> Short story: Have had romantic notions about 'life on the road', scanned
> craigslist relentlessly for something suitable, found a 'fixer upper'
> GMC, made the deal and buyer's remorse has not yet set in.
>
> Rig is a 1974 Eleganza that the two previous owners had the same notion
> I did and apparently ran out of time / money / inspiration / passion. My
> turn now.
>
> It runs and drives mostly, the inside is mostly gutted and many but not
> all pieces are still with it.
>
> I need another project (like I need an additional hole in my head?) but
> this was something I thought would be fun and the better half didn't
> dismiss it as 'ugly' right out of the box. So there's a glimmer of hope.
>
> That's my story for now.
>
> Stu
> Silverton, Oregon
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340480 is a reply to message #340477] |
Tue, 29 January 2019 16:39 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Stu
Neither of you will ever regret the purchase and time spent on the road.
Had ours for over 20 years and while I thought I would have to sell last
Fall, I'm feeling better and may reconsider my previous decision.
Remember the breakdowns are part of the joy of ownership. Travel with a
copy of the Black List and don't worry. There is someone everywhere to help
you out.
To quote the Harley company, it's the journey, not the destination.
Mike in NS
Virus-free.
www.avast.com
On Tue, Jan 29, 2019 at 5:53 PM Stu Rasmussen (97381.com)
wrote:
> Greetings to the list.
>
> New list member, very recent GMC motorhome purchaser; thought it might
> be a good idea.
>
> 'Good idea' - subscribing to the list, definitely - purchasing the
> motorhome, we shall see.
>
> Short story: Have had romantic notions about 'life on the road', scanned
> craigslist relentlessly for something suitable, found a 'fixer upper'
> GMC, made the deal and buyer's remorse has not yet set in.
>
> Rig is a 1974 Eleganza that the two previous owners had the same notion
> I did and apparently ran out of time / money / inspiration / passion. My
> turn now.
>
> It runs and drives mostly, the inside is mostly gutted and many but not
> all pieces are still with it.
>
> I need another project (like I need an additional hole in my head?) but
> this was something I thought would be fun and the better half didn't
> dismiss it as 'ugly' right out of the box. So there's a glimmer of hope.
>
> That's my story for now.
>
> Stu
> Silverton, Oregon
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340482 is a reply to message #340477] |
Tue, 29 January 2019 16:54 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
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New Subscriber Stu:
Congrats on your purchase of a GMC MH! I hope your experience w/ them is as rewarding as ours has been!
And congrats on being willing to finish the PO’s (previous Owner) previous project.
I would encourage you to join your regional GMC MH club as there is much info to be gleaned from many willing GMCers.
Also GMC MI (Motorhome International) is a good group to belong to as they have 2 conventions per year w/ lots of very informative seminars. Their next convention is in Tallahassee, Fla. in March of this year. Their following convention (after Tallahassee) will be in Mansfield, Ohio and during Sept. of 2019. They usually have 125 to 200 coaches in attendance and it is quite a site. You don’t have to be a GMC owner, or drive one to the convention, in order to attend the convention.
There is also a lot of info to be gleaned thru the internet w/ very knowledgeable GMC owners and drivers.
Stay in touch!
Mike/The Corvair a holic
Also owner of:
76 GMC Eleganza II 26’
76 GMC Glenbrook 28’ stretch
78 GMC Glenbrook 26’ project coach
Sent from my iPhone
> On Jan 29, 2019, at 3:52 PM, Stu Rasmussen (97381.com) wrote:
>
> Greetings to the list.
>
> New list member, very recent GMC motorhome purchaser; thought it might be a good idea.
>
> 'Good idea' - subscribing to the list, definitely - purchasing the motorhome, we shall see.
>
> Short story: Have had romantic notions about 'life on the road', scanned craigslist relentlessly for something suitable, found a 'fixer upper' GMC, made the deal and buyer's remorse has not yet set in.
>
> Rig is a 1974 Eleganza that the two previous owners had the same notion I did and apparently ran out of time / money / inspiration / passion. My turn now.
>
> It runs and drives mostly, the inside is mostly gutted and many but not all pieces are still with it.
>
> I need another project (like I need an additional hole in my head?) but this was something I thought would be fun and the better half didn't dismiss it as 'ugly' right out of the box. So there's a glimmer of hope.
>
> That's my story for now.
>
> Stu
> Silverton, Oregon
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340492 is a reply to message #340488] |
Wed, 30 January 2019 02:00 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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Roy,
My spreadsheet does not consider slip but, at 3000 RPM 3.7 diff 1st is 26,
2nd is 43, and 3rd is 64.5. Second Gear with a 3.07 and 3500 RPM should be
61 MPH and after you get over the hill 2500 RPM would be 65 MPH
I can see running half throttle uphill if you are not sure what your
temperatures are, but with the digi-panel + a tack and vacuum gauge, I
think you could be safe using most of the power a 455 can produce.
I want to add water temp in and out of the radiator as well as in and out
of the transmission oil cooler and fuel pressure.
Steve,
How do you feel about the switch torque converter? Is it kind of like
dropping into second gear when the pedal is to the metal or is it more
touque as RPM decrese? Is it a way to simulate more gears in the
transmission?
On Tue, Jan 29, 2019 at 4:46 PM roy keen wrote:
> Don't think I would worry about that. You must be going around 65 or more
> at 3000 rpm with 370 gears.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
> _______________________________________________
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>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340497 is a reply to message #340407] |
Wed, 30 January 2019 08:15 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I mounted the digipanel out of sight on my 23', and will on the 26'. What I want is the alarm from it. I have reasonable accurate gauges for exacts which I can see.
I'm hoping the new engine will show me the 3.7 is worthwhile - it certainly added nothing but noise and RPM to the last motor. Which was basically junque. In roughly three years I found zero benefit from the antispin setup in it... it just spun both wheels instead of only one in the loose stuff. We will see.
--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
[Updated on: Wed, 30 January 2019 08:16] Report message to a moderator |
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340498 is a reply to message #340486] |
Wed, 30 January 2019 09:16 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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SteveW wrote on Tue, 29 January 2019 19:08Bob -
You've got me curious / worried about this: "NEVER use more then half throttle. NEVER. And except the speed you get."
I've got a 23 footer weighing in at 11K or so - with a 455 and a 3.70 Limited Slip final drive. Manny tranny. Patterson carb and HEI distributor.
I've traveled up hills - pedal to the floor (kick down switch disabled) - in high gear and at 3000 RPM or so - and LOW vacuum. Coach seemed to work just fine. No excessive temperature rise (trans and water) and no noticeable ill effects...
Sounds like I ought not do this... Shift to second gear and keep vacuum up ?? I had been led to believe that keeping RPMs up was the guiding principle.
Thoughts ??
And as always - thank you ALL for your contributions to this community. I certainly have been a beneficiary.
Steve W
1973 23 Yellow
Southern California
Steve,
Three abbreviations we have to know now...
BMEP Brake Mean Effective Pressure - How hard the combustion is pushing in the pistons.
(P)ICP (Pre) Ignition Cylinder Pressure - what the cylinder pressure it just before the spark plug (tries to) fire.
WOT Wide Open Throttle - Do I need to explain this one?
There are three different problems we are fighting.
The deadliest of these is lugging. That is when you are running with low crankshaft speed and high BMEP. This has a tendency to pound on pistons and bearings. The bearing are often below the surface speed that they need to build the hydraulic wedge that is how they support the loads that they will encounter. At 3000 you are well above lugging.
The next is the one that kills the GM HEI systems. The is the well known problem that it is harder to start the fire at higher ICP. This is simply because there are more molecules in the way. This should ring a bell to anybody that has has ignition failures at high loads. The higher voltage that can accumulate is what takes out the coils and modules of HEI.
A third issue you seem to be handling is that the heat rejection from the driveline while running at high loads is very often an issue that is a serious issue. Lots of people that have street grade passcar that believe that they could maintain a high speed find this out the hard way. Many of the old muscle cars could be destroyed in a single extended high speed run.
That is why Bob would not want to run a coach motor at more than half throttle. I will bet that he does not limit his Corvair to half throttle, but racers tend to not stay at WOT for very long because the track is not straight.
Now, to your specific case, you can run at WOT-3K for the time it takes even to climb a serious mountain without doing any harm. These engines will take that and more. The real limiter becomes the carburetor flow. Be aware that the Rochester you are running has a power enrichment system to keep the cylinder temperatures down at high manifold pressures (low vacuum) that you can have at/near WOT. As soon as that power enrichment is active, you are close to "flushing" the carburetor. While it is hard to have good fuel economy when climbing, having the power circuit on will guarantee that you burn more fuel. I did so projects with aircraft engine people, and they often referred to passcar engines as "gasoline cooled".
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340499 is a reply to message #340477] |
Wed, 30 January 2019 09:16 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Stu!
amazing how small of a world it is. Jon Roche here, to jog your memory, I am the younger son of Rose and Howard(RIP) Lantz. they owned the Bed and Breakfast back in like 1992 (next door to your office right?) and I lived in Silverton for many years. You and I had attended a couple of the amateur radio club meetings together.
I have owned a GMC going on 9 years now, and only paid $500 for it, so I have had to fix and repair a few things over the years. I also have done my share of helping and working on other coaches. Give me a call or email, and we can talk and get you on the right track. GMC is a project, but they have major potential. Large number of people out there that are driving these things coast to coast. I am in MN now, and I am jealous of you, because I know Oregon, and Silverton area is probably one of the best spots to own a GMC motorhome for the opportunity's to use. at -25 today, I am not going to bother even think of starting my coach in MN.
my email is lqqkatjon at gmail.com. phone number 612-961-41 nine six
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340501 is a reply to message #340477] |
Wed, 30 January 2019 09:52 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Stu Rasmussen (97381. wrote on Tue, 29 January 2019 16:52Greetings to the list.
New list member, very recent GMC motorhome purchaser; thought it might be a good idea.
'Good idea' - subscribing to the list, definitely - purchasing the motorhome, we shall see.
Short story: Have had romantic notions about 'life on the road', scanned craigslist relentlessly for something suitable, found a 'fixer upper' GMC, made the deal and buyer's remorse has not yet set in.
Rig is a 1974 Eleganza that the two previous owners had the same notion I did and apparently ran out of time / money / inspiration / passion. My turn now.
It runs and drives mostly, the inside is mostly gutted and many but not all pieces are still with it.
I need another project (like I need an additional hole in my head?) but this was something I thought would be fun and the better half didn't dismiss it as 'ugly' right out of the box. So there's a glimmer of hope.
That's my story for now.
Stu
Silverton, Oregon
Stu,
Welcome to the group, family, cult, asylum.....
You are very right that joining us here was the right thing to do after buying the coach. The only better would have been to get here first, but we really don't care as long as you are here.
It is a sad story that we often get, someone bought a good coach and just had to "remuddle" it. They strip the interior and then run out of steam. Then they go to sell it and it can no longer be driven for any number of reasons so it is sold as scrap. I have seen this enough to want to cry.
You will soon find that the coach is more than just a big "new" and somewhat expensive toy because it connects you to this community. This is a group of helping and supportive people the like of which is probably unfamiliar, but I will get back to that. First thing to do is to hook up with a local chapter. You have at least two, and you will find that more than a few have a parts coach that can be used for thoughts and designs and maybe raided for some parts. If you find a GMC owner that does not want to talk about his coach, then we are up to one....
While the TZEs are smaller than many, they work way better than most for living and travel because the were designed by people that knew what they were doing and not thrown together (on the back of a truck) in a barn.
While you did cover the important stuff in you opening and I have to admit that I don't know if the sigfile system will work for you, you would do well to look it up and maybe make it work. It should have your real name (so Jon and others know who you are), a short about the coach (they are not all the same) and the same geographic that you were kind enough to include so some that may choose to assist has some idea where you are.
Now, about this group. As said, they love to help other owners. An owner will never pass another that might need assistance and that is just the beginning. We all have stories of help provided by others and some is amazing. The simple fact is that these people remind me very much of the watermen that are my world and so I have taken to welcoming those that show up here much as one might be welcomed there. So,
May the Good Lord bless this coach and all those that set forth within her.
Welcome Stu
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] New Subscriber, test message and brief intro [message #340503 is a reply to message #340499] |
Wed, 30 January 2019 10:43 |
Stu Rasmussen
Messages: 130
Registered: January 2019
Location: Silverton, OR
Karma: 0
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Senior Member |
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Small world indeed!
And I hear of Minnesota being at -30 right now. Eek!
Nice to reconnect - We see Rose occasionally when our paths cross at the
Wilsonville Goodwill store, and I fondly remember Howard telling of his
brief days as a used car salesman, wildly flipping his tie to signal a
co-worker that he needed help with a customer - and his co-workers
getting a good laugh at the expense of the newbie. Priceless!
Stu
On 1/30/2019 7:16 AM, Jon Roche wrote:
> Stu!
>
> amazing how small of a world it is. Jon Roche here, to jog your memory, I am the younger son of Rose and Howard(RIP) Lantz. they owned the Bed
> and Breakfast back in like 1992 (next door to your office right?) and I lived in Silverton for many years. You and I had attended a couple of the
> amateur radio club meetings together.
>
>
> I have owned a GMC going on 9 years now, and only paid $500 for it, so I have had to fix and repair a few things over the years. I also have done my
> share of helping and working on other coaches. Give me a call or email, and we can talk and get you on the right track. GMC is a project, but
> they have major potential. Large number of people out there that are driving these things coast to coast. I am in MN now, and I am jealous of you,
> because I know Oregon, and Silverton area is probably one of the best spots to own a GMC motorhome for the opportunity's to use. at -25 today, I am
> not going to bother even think of starting my coach in MN.
>
> my email is lqqkatjon at gmail.com. phone number 612-961-41 nine six
>
>
>
>
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Stu Rasmussen W7QJ
Silverton, OR
'77 Birchaven
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| Re: [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340504 is a reply to message #340407] |
Wed, 30 January 2019 10:48 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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I've never had my 403 at the wide open throttle position except for passing. And that's on 2 lane roads only. I shift down to a lower gear ratio. I'll run the RPMs up to just under 5000 if needed. So that I don't go to wide open. My half throttle, and seldom 3/4 at most rule. Is to keep the combustion chamber pressures/temps lower, exhaust valve temps lower, bearing loads down, and thus my over all engine temps lowered in the prosses. The next benefit is that my trans temp/load is reduced. The trans that's in the GMC we drive now. Was in the burned GMC. I rebuilt that trans myself in 2003. Plus that trans never is on the road without a 17000, to 24000 lbs GVW. I've never had any engine problems except for the water pump shaft that twisted off a year ago. I don't know of any GMC that pulls the loads that ours's does. That 3:70 FD has a lot to do with it. And I do it with the heaviest coach. Then the smallest engine. Something to think about the next time that you don't want to run the RPM's up. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Sunday, January 27, 2019 11:26 AM
To: gmclist@list.gmcnet.org
Subject: Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission.
Think of it this way. You have a 10 speed bike. You shift to a lower ratio. So that it takes less effort for you. The bikes engine. To get down the road. Or up that hill. Thus you. The bikes engine will run cooler. And not be so tired at the top of the hill. The 3:70 FD is an outstanding improvement to any GMC. Towing or not. Mileage goes up because your running a higher intake vacuum. Less load on pistons/bearings. And the water pump is getting more water to the radiator. The same situation for the transmission. Runs cooler with less load. More fluid to the trans cooler. If your running a power drive chain in the transmission. The trans will not get the less load/heat reductions that the 3:70 FD offers. And finally as to transmission loading on steep climbs. NEVER use more then half throttle. NEVER. And except the speed you get.
There is a very old thought that running an engine at higher RPM's is hard on your engine. That idea died in the mid 50's. When compression ratio's went up. Piston technology made great strides. Aluminum pistons were replacing the heavy cast iron ones of the day. Engine lubrication system were greatly improved. Pulling a heavy load like are GMC's at low RPM's. Puts more load on the engine pistons, and bearings. Reduce the load/heat on your engine, and trans. Don't be overly concerned about running the RPM's to the 4000, to 4500 point. I've been in the mountains with a GVW of 17,000 lbs. That's the weight on one and a half GMC's. Using a perfectly stock 403. No headers, no 3 inch exhaust, and no extras engine venting. Bob Dunahugh
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