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Re: Gas Prices- At What Point Do You Park It? [message #116456 is a reply to message #116338]

Thu, 24 February 2011 23:09

Craig Lechowicz

Messages: 541
Registered: October 2006
Location: Waterford, MI

Karma:

Senior Member

Gord,
Not sure what fits your definition of a "modern" engine. DOHC and 4 valves per cylinders date back to the 20's. Diesels live in a different fuel economy class than gas engines primarily because the fuel has higher btu content, and because they don't throttle the air intake, so they have lower pumping losses. They probably represent the only way you could get a GMC from 10 mpg to 20 without going to something very exotic in the gas world, like homogeneous charged compression ignition, which is always 5 years away. There might be gains of 5% in dohc/4valve, 3% in variable valve timing, and 3% each in roller rocker arms, and roller cam followers. But all those are individual improvements, and it's less when you add them all together. Direct injection engines with turbos could add to that (Ford Ecoboost or the GM turbo 4's) but I think 2011 is the 1st year Ford's put one in a 1/2 ton pickup and I'm thinking there is a reason that they don't use it in 3/4 or 1 ton's yet, most likely rated to duty cycle and cooling issues. (320 hp and 420 ft. lb. torque would meet our requirements until something bad happened, at least). It's rated at 21 mpg highway in a vehicle with less than 1/2 the weight, maybe 2/3 of the frontal area, twice as many transmission speeds, massive amounts of exhaust recirculation to limit pumping losses, and lots of other tweaks and tricks on the vehicle side. (lower rolling resistance tires, low friction brakes, 2 less wheels and wheel bearings, and lots of aero tricks). So, to make a long story short, mileage gains, even for automakers have a tendency to come in 0.1 mpg's at a time, and not whole numbers or two digit ones.

Craig Lechowicz
'77 Kingsley, Waterford, MI

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[Message index]

		Gas Prices- At What Point Do You Park It? By: philipswanson on Thu, 24 February 2011 09:16
		Re: Gas Prices- At What Point Do You Park It? By: Dennis S on Thu, 24 February 2011 09:26
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Thu, 24 February 2011 09:45
		Re: Gas Prices- At What Point Do You Park It? By: gordh1 on Thu, 24 February 2011 10:03
		Re: Gas Prices- At What Point Do You Park It? By: jhb1 on Thu, 24 February 2011 10:19
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Thu, 24 February 2011 17:46
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Craig Lechowicz on Thu, 24 February 2011 18:28
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gordh1 on Thu, 24 February 2011 18:31
		Re: Gas Prices- At What Point Do You Park It? By: cbwoodsr on Fri, 25 February 2011 08:39
		Re: Gas Prices- At What Point Do You Park It? By: Jim Galbavy on Fri, 25 February 2011 15:13
		Re: Gas Prices- At What Point Do You Park It? By: Luvn737s on Thu, 24 February 2011 10:18
		Re: Gas Prices- At What Point Do You Park It? By: Larry C on Thu, 24 February 2011 11:06
		Re: Gas Prices- At What Point Do You Park It? By: philipswanson on Thu, 24 February 2011 11:27
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Thu, 24 February 2011 11:48
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Fri, 25 February 2011 14:46
		Re: Gas Prices- At What Point Do You Park It? By: mike miller on Thu, 24 February 2011 11:51
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Thu, 24 February 2011 11:58
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Thu, 24 February 2011 12:30
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Keith V on Thu, 24 February 2011 12:49
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: philipswanson on Wed, 02 March 2011 12:15
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: philipswanson on Wed, 02 March 2011 12:21
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Thu, 24 February 2011 18:12
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Thu, 24 February 2011 23:15
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 01:16
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Fri, 25 February 2011 08:53
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: ejuk8em on Thu, 24 February 2011 12:15
		Re: Gas Prices- At What Point Do You Park It? By: lqqkatjon on Thu, 24 February 2011 14:09
		Re: Gas Prices- At What Point Do You Park It? By: carguy on Thu, 24 February 2011 15:41
		Re: Gas Prices- At What Point Do You Park It? By: cbwoodsr on Thu, 24 February 2011 15:43
		Re: Gas Prices- At What Point Do You Park It? By: gordh1 on Thu, 24 February 2011 17:01
		Re: Gas Prices- At What Point Do You Park It? By: Carl S. on Thu, 24 February 2011 19:54
		Re: Gas Prices- At What Point Do You Park It? By: rwbmitiopt@comcast.net on Thu, 24 February 2011 19:56
		Re: Gas Prices- At What Point Do You Park It? By: Carl S. on Thu, 24 February 2011 20:21
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Tim Conway on Thu, 24 February 2011 21:51
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: hnielsen2 on Thu, 24 February 2011 22:13
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Tim Conway on Thu, 24 February 2011 22:22
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Mike Teets on Thu, 24 February 2011 18:10
		Re: Gas Prices- At What Point Do You Park It? By: John Ruff on Thu, 24 February 2011 18:49
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Tim Conway on Thu, 24 February 2011 19:00
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Carl S. on Thu, 24 February 2011 19:46
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Tim Conway on Thu, 24 February 2011 21:56
		Re: Gas Prices- At What Point Do You Park It? By: Carl S. on Thu, 24 February 2011 20:19
		Re: Gas Prices- At What Point Do You Park It? By: gordh1 on Thu, 24 February 2011 21:00
		Re: Gas Prices- At What Point Do You Park It? By: Craig Lechowicz on Thu, 24 February 2011 23:09
		Re: Gas Prices- At What Point Do You Park It? By: gordh1 on Fri, 25 February 2011 10:59
		Re: Gas Prices- At What Point Do You Park It? By: WD0AFQ on Fri, 25 February 2011 11:48
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 12:52
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Bob de Kruyff on Wed, 02 March 2011 15:37
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 13:19
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gordh1 on Fri, 25 February 2011 14:04
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 15:14
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 15:27
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gordh1 on Fri, 25 February 2011 15:45
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 16:17
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 17:43
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 17:59
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 18:04
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 18:19
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 18:33
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 19:10
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jhb1 on Fri, 25 February 2011 19:44
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 19:55
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Byron Songer on Fri, 25 February 2011 22:24
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: UziYaH on Fri, 25 February 2011 23:24
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Little Yimmy on Sat, 26 February 2011 08:16
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: mike miller on Fri, 25 February 2011 20:38
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: WayneB on Sat, 26 February 2011 10:43
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Dennis S on Fri, 25 February 2011 15:34
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gordh1 on Fri, 25 February 2011 15:48
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Dennis S on Fri, 25 February 2011 15:59
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Wed, 02 March 2011 17:55
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: jimk on Thu, 24 February 2011 23:13
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: shawnee on Fri, 25 February 2011 07:46
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Wed, 02 March 2011 17:58
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Steven Ferguson on Sat, 05 March 2011 09:04
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Sat, 05 March 2011 15:05
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Sat, 05 March 2011 17:08
		Re: Gas Prices- At What Point Do You Park It? By: Craig Lechowicz on Fri, 25 February 2011 13:36
		Re: Gas Prices- At What Point Do You Park It? By: gordh1 on Fri, 25 February 2011 14:26
		Re: Gas Prices- At What Point Do You Park It? By: Larry on Fri, 25 February 2011 16:08
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Fri, 25 February 2011 16:16
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: UziYaH on Fri, 25 February 2011 22:34
		Re: Gas Prices- At What Point Do You Park It? By: mschultz on Sat, 26 February 2011 08:52
		Re: Gas Prices- At What Point Do You Park It? By: Larry C on Wed, 02 March 2011 18:06
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: gmcrv1 on Thu, 03 March 2011 09:28
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: UziYaH on Thu, 03 March 2011 15:27
		Re: Gas Prices- At What Point Do You Park It? By: Hardie Johnson on Sat, 26 February 2011 10:27
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: UziYaH on Sat, 26 February 2011 11:36
		Re: Gas Prices- At What Point Do You Park It? By: Larry C on Sat, 05 March 2011 08:54
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: comcast on Sat, 05 March 2011 08:59
		Re: Gas Prices- At What Point Do You Park It? By: Bob de Kruyff on Wed, 02 March 2011 12:52
		Re: Gas Prices- At What Point Do You Park It? By: philipswanson on Mon, 07 March 2011 21:13
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Mr ERFisher on Mon, 07 March 2011 21:48
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Tue, 08 March 2011 07:27
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Mr ERFisher on Tue, 08 March 2011 07:42
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Ray Erspamer on Tue, 08 March 2011 08:04
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Tue, 08 March 2011 08:34
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: midlf on Sat, 12 March 2011 16:43
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Tue, 08 March 2011 08:33
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: philipswanson on Tue, 08 March 2011 08:47
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: James Hupy on Tue, 08 March 2011 10:58
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Bob de Kruyff on Tue, 08 March 2011 11:10
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Tim Conway on Tue, 08 March 2011 11:18
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Carl S. on Tue, 08 March 2011 11:34
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Dennis S on Tue, 08 March 2011 11:30
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Ray Erspamer on Tue, 08 March 2011 12:28
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: hal kading on Tue, 08 March 2011 14:34
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry C on Tue, 08 March 2011 15:43
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Ken Henderson on Tue, 08 March 2011 20:37
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: Larry on Sat, 12 March 2011 18:52
		Re: Gas Prices- At What Point Do You Park It? By: PETEinLongBeach on Tue, 08 March 2011 01:00
		Re: [GMCnet] Gas Prices- At What Point Do You Park It? By: USAussie on Tue, 08 March 2011 03:24
		Re: Gas Prices- At What Point Do You Park It? By: Keith V on Tue, 08 March 2011 07:39
		Re: Gas Prices- At What Point Do You Park It? By: PETEinLongBeach on Wed, 09 March 2011 06:22
		Re: Gas Prices- At What Point Do You Park It? By: cbwoodsr on Tue, 08 March 2011 08:07

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