| [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #223666] |
Thu, 26 September 2013 20:52  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
|
Senior Member |
|
|
Three limiting factors:
1) front to back the area allocated to propulsion system is very short so the transmission must do a 180 degree turn - output of the engine points rearward, output of the transmission points forward and the location of the drive shafts front to back can't change much
2) top to bottom the area allocated to propulsion system is very low so the drive shaft to top of air cleaner distance is severely limited - can't change the drive shaft location up/down and can't make much of a change to the cockpit deck height off the ground
3) has to be able to handle the torque loads to pull a 12,000 pound vehicle up a mountain grade
Anything that will do all three of these things is a contender. Anything that will do two out of three is a non-starter.
Most likely the "solution" will need to come in the form of a 4th gear for the existing transmission. That would allow low enough gearing to match the torque curves of modern crate engines while still allowing the engine to turn low enough RPMs to be practical.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
Visitors always welcome!
glwork@mac.com
http://jerrywork.com
541-499-1027
541-592-5360
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #223689 is a reply to message #223666] |
Thu, 26 September 2013 23:45  |
Phantom2
Messages: 94
Registered: September 2012
Location: Springfield, IL
Karma: 0
|
Member |
|
|
Modern trains are pulled by Diesel/Electric locomotives. Auto manufacturers are developing cars & trucks with electic wheel motors, but are using batteries mainly for power, some can charge the batteries with small gas engines while driving to increase range.
Protean’s new motor can deliver 75 kW of power (100 hp) and 1,000 Nm (735 lb-ft) of torque, a 25% increase in peak torque over the previous generation’s design. Each motor weighs 31 kg (68 lbs). Regenerative braking capabilities allow up to 85 percent of available kinetic energy to be recovered.
http://chargedevs.com/newswire/two-new-in-wheel-electric-drive-systems-unveiled/
It seems if a gas engine driven generator with enough output to drive the motors on up to four rear wheels might be an answer. Probably be expensive though.
Larry Hopkins
75 Avion
Springfield, IL
|
|
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #223787 is a reply to message #223666] |
Fri, 27 September 2013 17:54 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
|
Senior Member |
|
|
Or a longer step area for a longer transmission/transfer case setup.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #224550 is a reply to message #224538] |
Fri, 04 October 2013 17:21 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
You're gonna need somewhere aroundf a 5.11 final drive to keep that one up on the torque curve. Which, hauling aa 5 1/2 ton load id gonna drop thwe mileage down to what? Maybe 8 - 10? Might still be worth it, the extra gear could let you slow the engine down a bit and hit the high side of 10mpg.
--johnny
--------------------------------------------
On Fri, 10/4/13, Sigmund Frankenfelter <ziggy.frankenf@gmail.com> wrote:
Subject: Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion
To: gmclist@temp.gmcnet.org
Date: Friday, October 4, 2013, 8:13 PM
Keith V wrote on Fri, 04 October 2013 12:04
> 300 hp but whats the torque?
I am seeing some different numbers but one site says 303 hp
and 323 foot pounds of torque at 4000 rpm. Fuel economy (in
the Impala) at 16 - 24 mpg
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #224553 is a reply to message #224549] |
Fri, 04 October 2013 17:30 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Well, she and I decided early on that we had to choose between a million bux and a million dogs and cats and kids. We opted for the latter. I look on our GMC as the thinking man's Newell.
--johnny
'76 23' transmode norris
--------------------------------------------
On Fri, 10/4/13, Larry Davick <ljdavick@comcast.net> wrote:
Subject: Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion
To: gmclist@temp.gmcnet.org
Date: Friday, October 4, 2013, 10:20 PM
Sigmund Frankenfelter wrote "If my
plan to become a billionaire in the next five years
succeeds, I'll probably try it on a 23 footer."
It occurs to me that many GMCers aspire to become
billionaires but I don't know of a single billionaire who
aspires to becoming a GMCer. This leads me to the conclusion
that the two are mutually exclusive!
Larry Davick
Fremont, California
A Mystery Machine
'76 (ish) Palm Beach
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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
|
|
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #224583 is a reply to message #223666] |
Fri, 04 October 2013 21:16 |
rcjordan
Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...
Karma: 1
|
Senior Member |
|
|
>small ELEPHANT
>computer power
And that computer power has now become yet another small elephant itself. When we find a modern drivetrain, it's going to come with a host of ECMs and sensors. I'm thinking that the wiring and re-pinning is going to take some serious work.
SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC
|
|
|
|
|
|
|
|
| Re: [GMCnet] "Bench Racing" the GMC - Modern propulsion [message #224709 is a reply to message #223666] |
Sun, 06 October 2013 13:36 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
|
Senior Member |
|
|
Can it be done? Yes, given enough time talent and tools. Plus lots of $$$$.
I run a TH425 with twin turbo 350 Small Block chevy in a mid engine 75 Vega.
A 383 with the vortech heads and fuel injection [or even better an Iron block LS] with a small turbo would be do-able with off the shelf tech. Better fuel economy and better torque under load. I cant afford to do it, but if someone wants to step up to the pump and has the funds Ill help them.
I dont think there is enogh of a market for the R&D for an OD trans or mod. However, I do know they make underdrve 1/2nd gearsets for TH400s. Not sure that they will fit a TH425- I seem to recall they use a reverse rotation planetary- but they could be made Im sure. This would let you keep the stock final ratio for highway economy with a lot more pulling power in lower gears.
I have 3.46 gears and it works for me as is. But, if I had to rebuild the trans and the lower gears were availible Id go for it.
76 Glenbrook
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
