Re: New Christy Rambler (Ebay)

[<mail@xxxxxxxxxxxx>]

I wish I could give you the hard data. Time and old man winter will most likely not allow it :[ I sometimes got a solid 25+ mpg out of my AX15 Cherokee Sport. 4X4 4.0L 3:08 axles. Flat lands of Ohio 65 mph cruise speed. The same mileage was experienced down in Virginia in the flatter areas between 24 and 26 loaded. I have no doubt my American does similar or better.
--
Mark Price
markprice242ATadelphia.net
Morgantown, WV

 
---- Tom Jennings <tomj@xxxxxxx> wrote: 
> 
> On Nov 2, 2005, at 1:24 PM, <mail@xxxxxxxxxxxx> wrote:
> 
> > IIRC my tires [25560R15] are about 26.5 tall and I have a Spirit  
> > T-5 with 3:31 gears. It cruises on the highway just great. I have  
> > no real idea of what RPM it pulls as I've never mounted a tach.  
> > Fuel Mileage? I've not checked it offically, but it is real good,  
> > I'd estimate 25-30 mpg highway easy. I wish I could drive it more  
> > to get and official read on it. The 3:31's seem to be about perfect  
> > with my current combo.
> >
> 
> Yours is turning 2500 at 60, 2900 at 70; mine's somewhat less, 2200  
> and 2550 or so. (see below)
> 
> I'd be really interested in hard mileage data on your car. I'm  
> getting a solid 22 mpg highway at 60 - 65 mph, 19 mpg at 70 - 75 mph,  
> and around 18.5 in-town. That's 7800 miles, 400 gals of data (every  
> single fillup and mile since I ran the car in June 2005. I drive 300  
> mi/week (100 mi/day 3 days) on I5, I605, I405, LA to Irvine.
> 
> Long ago we had a thread about mileage, engine efficiency, cruising  
> 'sweet spot', torque peak, etc. Never got resolved to my  
> satisfaction. The old and general consensus is that best mileage is  
> under 2000 rpm, and that torque peaks are spec'd under 2000 rpm for  
> the motors AMC used. Clearly, you and I, and nearly all of the  
> numbers I've seen in TSMs regarding GEARING (not engine rpm/hp/torque  
> specs...) puts 60 - 70 mph cruise will over 2000 rpm.
> 
> I don't believe the TSM engine torque and HP specs, at all. Net or  
> gross, it's half marketing and tax issues. I'd love to hear actual  
> dyno numbers on actual factory-stock motors, but I don't think many  
> people do that.
> 
> Clearly gearing is all a compromise even in the fuel-spree 60's, but  
> still, factories tended to know what they were doing, if only be  
> large-scale trial and error.
> 
> 
> 
> Mark's car,  hacked up from my Hornet spreadsheet, I included on 3rd  
> gear (1:1).
> 
> 
> 		RPM	CFM	MPH		TIRE DATA	
> 			1000	60	24.3		
> Axle ratio n:1	3.31	1100	66	26.7	Width:	255
> Tire diameter	27.05	1200	72	29.2	Aspect:	60
> 			1300	78	31.6		Wheel:	15
> 			1400	84	34.0	Diameter:	27.05
> 			1500	90	36.5			
> 			1600	96	38.9			
> RPM interval	100	1700	102	41.3			
> 			1800	108	43.8			
> 904 Auto		1900	113	46.2			
> First	2.54		2000	119	48.6			
> Second	1.55		2100	125	51.1			
> Third	1		2200	131	53.5			
> 			2300	137	55.9			
> 			2400	143	58.3			
> Engine CID	258	2500	149	60.8			
> VE	0.8		2600	155	63.2			
> 			2700	161	65.6			
> 			2800	167	68.1			
> 			2900	173	70.5			
> 			3000	179	72.9			
> 			3100	185	75.4			
> 			3200	191	77.8			
> 			3300	197	80.2			
> 			3400	203	82.7			
> 			3500	209	85.1			
> 
> 
> 
> 
> 
>