[BFix] replacing 170 with a 200? 4.0??

[Stephen Urban]

Sorry, I simplified my reply a little too much but note I did state 
"without struggling". My comment was referring to engines in the same 
relative power range. Obviously a 460 is going to be loafing along where 
a 170 would be maxed out.


Steve Urban
Semper Fi!
SCB#143
EBR#0692
CA4WDC#3576
NRA & CRPA Life Member
29 Palms, CA
sfu at roadrunner.com

ts wrote:
> Yes and no. It does matter how hard that engine is working. The harder 
> that you work an engine the shorter it's life will be, but also the 
> less likely that it is operating at it's best rpm (unless on a governor).
>
> Say it takes 35HP to move down the road at 65 mph. A 40 HP engine is 
> going to be basically WOT for the duration, where a 100 hp engine will 
> be running with higher manifold vacuum and at a leaner mixture than 
> the 40 HP could stand.
>
> Effective total gearing is huge. For best efficiency the engine needs 
> to be operated at it's best Brake Specific Fuel Consumption rpm (BSFC, 
> least fuel for most power produced), which happens to be the same rpm 
> where peak torque occurs.
>
> */Stephen Urban <sfu at roadrunner.com>/* wrote:
>
>     As long as the engine has sufficient power to move the vehicle
>     without
>     struggling, mpg would be affected much more by other factors then
>     what
>     engine is in place. Explorer with hwy gears, 5-speed and street tires
>     will obviously get better mpg then an EB with trail gears, 3-speed
>     and
>     mud terrains, even with the same engine.
>
>     Also are these posted mpg results for a 4x4 or 4x2 version of the
>     Explorer.
>
>     Steve Urban
>     Semper Fi!
>     SCB#143
>     EBR#0692
>     CA4WDC#3576
>     NRA & CRPA Life Member
>     29 Palms, CA
>     sfu at roadrunner.com
>
>     Roger wrote:
>     >
>     > I average 17 driving to work. Mostly freeway but some weekend
>     stop and
>     > go. Maybe a tune up or some Lucas injector cleaner?
>     >
>     > *From:* bfix-bounces at broncofix.com
>     [mailto:bfix-bounces at broncofix.com]
>     > *On Behalf Of *Quinn Dusenberry
>     > *Sent:* Friday, May 02, 2008 9:19 AM
>     > *To:* 'BFix'
>     > *Subject:* RE: [BFix] replacing 170 with a 200? 4.0??
>     >
>     > I don’t think it would be much more economical the a 5.0L. My 97
>     > Explorer with a 4.0L got just over 14 mpg on a recent freeway trip.
>     > Pretty disappointing.
>     >
>     >
>     ------------------------------------------------------------------------
>     >
>     > *From:* bfix-bounces at broncofix.com
>     [mailto:bfix-bounces at broncofix.com]
>     > *On Behalf Of *robert goodrich
>     > *Sent:* Friday, May 02, 2008 6:27 AM
>     > *To:* TJ Essenmacher; BFix
>     > *Subject:* [BFix] replacing 170 with a 200? 4.0??
>     >
>     > why not go 4.0 explorer motor? I heard it's the SBF bolt pattern
>     so it
>     > should be the same as a 5.0 conversion but a lot lighter and a lot
>     > more economical! I thought of it before I built the 302!
>     >
>     >
>     ------------------------------------------------------------------------
>     >
>     > From: tessen at btc-bci.com
>     > To: mail at broncofix.com
>     > Date: Fri, 25 Apr 2008 11:39:16 -0500
>     > CC:
>     > Subject: [BFix] replacing 170 with a 200?
>     >
>     > I have been told that a 200 is a decent improvement from the 170. I
>     > have the opportunity to buy one cheap, my question is was will
>     it take
>     > to convert? the 200 is an auto ant the 170 is 3spd. I'm stil
>     gathering
>     > parts for the 351 upgrade but if this is quik and cheap enough
>     it'll
>     > work until my daughter gets out of college.
>     >
>     > Thanks,
>     >
>     > Tim
>     >
>     >
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