What is this old car, with rounded shell, inch thick wood interior?

[J. Clarke]

and

Good luck running pump gas at 15:1 compression.

[clare]

And the 4 cyl Camry today would not be too far behind!!

[clare]

And take out the clutch, u-joints, diff, or rear axles if you did it too often. And A-70 13s were skinny tires - I ran c70s on my 63 valiant and on my (don't die laughing) Pontiac Firenza (Vauxhaull HC Magnum). The a 70 is equivalent to a 165-70 p metric tire - I call them "bicycle tires" or "Roller skate wheels" A C70 was the same as a

215 p-metric and actually filled out the fender-wells a bit - particularly on the F'renza with vega or chevette GT wheels (6 inch width instead of the 4.5 or 5 inch Vauxhall rims)

[clare]

Gross vs net horsepower, for one, and a whole lot of changes to things like compression ratio and cam profilkes that made it far from "the same engine". The laws of physics didn't change.The accountants running the auto companies over-rode the engineers so radical engineering that could have met the emissions targets and fuel economy targets never saw the light of day.- Untill the Japs did it and the American companies had to follow or die. By this time the technology required was becoming mainstream.

[clare]

They weighed half what a Mustang weighed too, and had less flat plate area and a lower Cd.

[Mike Marlow]

Guys - learn how to snip!

[notbob]

Emission controls?

ALSO! ppl's laziness!

I usta have an '87 Honda Civi Hatchback (SI). No power anything! Not seats, not windows, not mirrors. The car weighed in at under 1500 lbs and was considered pretty hot on the stock race circuit. By '93, the same model had electric everything. Weighed almost twice as much. Sure, engine performance had improved. Unfortunately, so has ppl's sloth!

Also, '70 Vettes were pigs! I read, somewhere, an early Stingray had a chassis that weighed more than a Cadillac's. True? I have no idea, but know from first-hand-experience, both my step-father's Stingray's ('63, '65) were lead-balloon pigs! ;)

nb

[clare]

On Sat, 25 Mar 2017 14:42:08 -0400, "J. Clarke" wrote: SNIP

The jeep tires ARE huge, and the electric's tires ARE tiny. The jeep tires are likely wider to start with (235mm vs 205?)- and then a higher profile, so the Jeep wheels are likley something like 30 inches in diameter while the electric's are likely on the shy side of 25 inches.

[clare]

Read the rest of my post - they were running alky - and most oftern also nitromethane.

Hiowever, with today's engine technology 15:1 CR is totally doable. - stock Mazda engines are routinely running 14:1 on regular gas with direct injection The Infinity QX50 2 liter turbo engine varied from

8:1 to 14:1 depending on driving conditions and puts out 268 hp and 288 ft lbs of torque.

With GDI and variable valve timing and variable CR,Static compression ratios in the diesel realm are becoming possible.

An older engine with a static compression ratio of 13:1 and a wild cam often had an effectice CR of only 9.6:1 due to valve overlap (which lowered the volumetric efficiency of the engine at low speeds and improved the volumetric efficiency at higher speeds, where a standard cam would cause the vo;lumetriv efficiency to drop off.

[John McCoy]

"J. Clarke" wrote in news: [e-mail]:

Apples and oranges comparison there. You're looking at the gross horsepower rating of an engine designed with no consideration for emissions or fuel economy, to the net rating of an engine designed (poorly) to have reduced emissions and better fuel economy. To call them the "same engine" shows a misunderstanding of what those two engines are.

Specific to those two engines, about 120hp of the difference came from the change to net horsepower ratings. Most of the remainder came from the 1970 engine being 11:1 compression ratio, and the 1981 version being 8:1 compression to run on regular gas instead of premium.

John

[John McCoy]

Markem wrote in news: [e-mail]:

Engineering wise, the Offy was far far far advanced over what Detroit was putting in production cars in the 60's (despite the Offy having been designed in the 30s). It's a fascinating design.

A good test of someone who thinks they know engines is to ask them to describe an Offy head gasket.

John

[clare]

They arfe a real bitch to do a valve job on too - - -

[Markem]

The offenhiesers were Indy car favorite for years, doubt any of them ever saw pump gas. The last one (its serial number) still achieved over 200mph at indy's 2.5 mile rectangle.

[Markem]

The law that brought you the EPA and cafe standards. Death, taxes and bureaucrats the things you can not avoid. The 1970 350 was reported at

370 for insurance purposes.

[Leon]

First off old hp ratings methods change IIRC in 1972. From that point the ratings were SAE, which significantly lowered the published ratings.

Later models had the inefficient catalytic converters, smog pumps, smaller carburetors, etc. All of those items robbed the engines of power all in the interest of controlling emissions.

Once the multi port fuel injection, mass air flow sensors, better intake design, better cataleptic converters, no more smog pumps, computer controlled monitored sensors, and ignition timing entered into the picture emissions were not as big of an obstacle to over come and we ended up with cleaner burning higher HP rated engines.

[J. Clarke]

What part of "physics" are you having trouble with?

[Leon]

Skinny by today's standards, but most small American cars back then had A78-13 tires. Still the same width but taller and less responsive to handling

- I ran c70s on my 63

IIRC about 6" for "A". A "C" was about 6.5", still pretty narrow. The 70 did not make tires wider but made them "look" wider. Same is true for 60, 50, etc series tires. You probably know that the number after the letter represented the height of side wall to tread width ratio.

Old VW tires were 5.60-15's. Really narrow looking.

[Markem]

Sorry, you are humor impaired for right now.

[J. Clarke]

And this is related to "the laws of physics" because?

And this is related to "the laws of physics" because?

And catalytic converters, smog pumps, etc were required because of what "laws of physics"?

[J. Clarke]

Read the whole damned thread and you'll know WHY.