Mileage with a Motor Home

[Raymond C Drouillard]

>> >-----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.

Maximizing vacuum increases mileage?  What about pumping losses?

If I find the speed of maximum torque on my 360 Jeep engine, should I set
it up to run at that speed when I am cruising?

Ray Drouillard
'89 Grand Wagoneer
Holley Pro-Jection, Jacobs ignition, Edelbrock performer manifold, Engine
Guard pre-luber, 3" exhaust system, 30x9.5 tires, stock 2.72:1 axles

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