lundi 30 mars 2015

60MPH mpg for 2.7 Ford pickup-and Turbos dodn't beat normally aspirated spark motors

Wayne et al

I saw the cold weather -20mpg- 60 mph mpg for the 2.7 Ford pickup

which apparently is rated at "just" 18/23??

I say "just" because I certainly expected it to BEAT -on paper

the Larger motored -and certainly less expensive(real life) 18/25 Dodge??



So Wayne do you have actual warm CA MPG and WEIGHT numbers for the Ford??



Now I am a Dodge and GM fan-

but I certainly expected Ford to produce Better EPA numbers than Dodge

and 18/23?? barely better than the GM 5.3 right?? a 360 hp V-8

which certainly would be cheaper to build



The Turbo spark ignition engines-are not producing



Does this strike ANYONE ELSE as SIMILAR to the early 1980's

When Turbo 4's were supposed to produce 4 cylinder MPG

But 8 cylinder acceleration??

But what actually happened is they didn't do EITHER- and coked up their Turbo bearings- meaning they were more expensive-less reliable- and didn't produce the MPG or the acceleration they were supposed to produce

Of course the normally aspirated 4 valve 4 cylinders became better-pretty much DID do both-good mpg and decent acceleration-



Dodge is beating Fords Turbo engines with MUCH simpler normally aspirated engines

and GM is matching them with a PRIMITIVE 60 year old pushrod 2 valve V-8



Once again-turbos work GREAT on diesels-but not so great on spark ignition motors

Seems it STILL makes NO SENSE- to try to make a small motor function " like" a larger motor

1) turbo engines are not lighter

2)inherent friction isn't less less

3) they aren't producing the better mpg-or the "same acceleration" of the simpler larger normally aspirated spark motors-

-

Just MAKE a LIGHT WEIGHT higher displacement BIGGER motor-and turn it SLOW-not too many RPMs

you don't have the problems with DETONATION( using extra fuel to cool mixture)

or the fancy "controls" and plumbing

and the COST



Yeah I don't see any turbo advantage with SPARK IGNITION motors

The GM 5.3 matches the fancy expensive Ford Turbos

The Dodge 3.6 HAMMERS them??



Where is the BEEF??

Charlie

PS Obviously TDs-completely different story-

1)they run lean with no problem

2)they don't "detonate" when pressure temps are "too high"

3) no throttle plate plugging intake

4)can run 17/1 compression PLUS 15 psi boost!!

Explains the 30% MPG advantage(and diesel contains more energy also per unit of volume)





60MPH mpg for 2.7 Ford pickup-and Turbos dodn't beat normally aspirated spark motors

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