[SEL] OT PA trip & fuel costs

[bill at antique-engines.com]

Note on gas engines, they have INCREASED compression ratios and are using
fast burn chambers.
Remember the compression ratios of the 60's and early 70's were in the
10:1 and 9:1 range, then dropped to 8:1 in the green decades - they are
back up.
Wonder why??
Fast burn, high compression, more effecient, less ping the faster you burn
it, racers know more compression means more power and more effeciency.

So what's the difference between our 90 year old H n M engines and the
newer engines that lock out certain valves when the power isn't needed?
GM stated it was "new technology" when they started using it. Tell that to
the folks at Hercules or Waterloo, etc. - s'pose they are rolling in their
graves? (about 500 rpm when needed, I guess)

Yeah, like Ford has just introduced an amazing new type of vehicle, the
cross-over utility vehicle! Gee, what was my 1980 EAGLE???
And it got in the 20's for economy and was FULL TIME 4 wheel drive.

I hear the diesel used in the Jeep Liberty is pretty decent - that what do
they call it, rail system, whatever...

Bill

> On 06/06/07, Rob Skinner <rskinner at rustyiron.com> wrote:
>> > I said before that a friend - who knows his stuff - says diesel is
>> > the way
>> > to go for now.
>>
>> Diesel is always the way to go, as higher compression ratio equals
>> higher efficiency.  Dugald Clerk wrote about it more than one hundred
>> years ago.  Clerk actually stated in one of his books that although
>> Diesel was on the right track by experimenting with high compression
>> engines, Diesel still didn't know WHY high compression was better,
>> and that he didn't understand the thermodynamics involved.  SMACK!
>> Ya think there could have been a little rivalry among engine luminaries?
>>
>> Rob
>>
>
> Just been talking to our local Renault dealer about replacing our
> present van. It will be 3 yrs old in September, probably done
> 150,000miles or so and we are gradually reducing the van replacement
> time cycle so that we eventually run under the 3-year warranty.
>
> The 140hp 2.5 turbo engine is now 150hp, same size engine, but the
> other bits are much the same. Getting a quote tomorrow, delivery will
> be September anyway.
>
> Can't remember what Audi and BMW get out of their car diesels, but the
> 2.5litre Renault van engine is a real gem. I believe that we can get
> it upped to 220HP with a chip remapping, but likely that would hurt
> the reliability (and warranty!) Best one we have ever had in the UK so
> far.
>
>
>
> Peter
> --
> Peter A Forbes
> Email: listerdiesel at gmail.com
> Web: www.oldengine.org/members/diesel
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