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aerohead · 05-19-2010, 04:49 PM

Dave,I don't know if this is germane to the issue,but back in the 1970s,B.Dayman Jr. of Jet Propulsion Lab published a SAE Paper on coastdowns conducted at Edward's AFB,and he claimed that driveline losses were so great with an automatic transmission car in neutral,that they had to add a special clutch to dis-engage the propeller shaft from the tranny to normalize effects with a standard transmission car.
Could still be valid,don't know.If true,this might explain some of the 'discepancy' between the Impala and the F-350.

05-19-2010, 04:49 PM	#11 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,256 Thanks: 24,382 Thanked 7,359 Times in 4,759 Posts	automatics Dave,I don't know if this is germane to the issue,but back in the 1970s,B.Dayman Jr. of Jet Propulsion Lab published a SAE Paper on coastdowns conducted at Edward's AFB,and he claimed that driveline losses were so great with an automatic transmission car in neutral,that they had to add a special clutch to dis-engage the propeller shaft from the tranny to normalize effects with a standard transmission car. Could still be valid,don't know.If true,this might explain some of the 'discepancy' between the Impala and the F-350.