Mileage with a Motor Home

[Clare Snyder]

Bernie Jacobsen wrote:
> 
> >What transmission is in the motor home?
> 
> TH400  Rebuilt by Art Carr
> 
> >
> >Can you add one of the overdrive units that goes after the transmission or
> >on the rear axle?
> 
> 4.10 on the rear.   I'm considering a Doug Nash (US Gear) OD unit for the
> tranny tail section, .67 OD, I think.  I am also considering a "close spaced
> torque converter" (less clearence between the blade sets... lower stall[?])
> 
> I am planning on using coated headers with 1.75" X 43" (!) primaries.  This
> peaks my torque at about 1800 RPM.  With the OD,  that's about where my
> hiway cruising speed should be.
> 
> ^Bernie
> 
> >
> >David
> >-----Original Message-----
> >From: Dave Balfour <balfour at bushnell.net>
> >To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> >Date: Friday, March 27, 1998 9:56 PM
> >Subject: Re: Mileage with a Motor Home
> >
 Will it not take more than headers to pull the max torque down by
nearly 30%?? Even a 454 may tend to lug at 1800RPM on a machine the size
of your MH. If it lugs, the vacuum drops, and with it fuel economy. The
reason MAX torque RPM gives best fuel economy is because it allows
highest sustained cruise vacuum. Anything above or below tends to drop
off vacuum if running anywhere close to rated load.
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