"amdx" wrote in message ...

On 9/11/2013 1:53 PM, iBoaterer wrote:
In article , says...

On 9/10/2013 5:56 PM, Mr. Luddite wrote:
Since boats have engines and for a change of pace, I thought I'd
share
some info I recently received from a car nut. He's talking about
a
custom built, 500 cubic inch dragster engine based on the Chrysler
426
c.i. hemi design.

Here's a short list of it's specs and acceleration capabilities:

Produces 8,000 horsepower. That's more than the first 4 rows of
cars
at NASCAR's Daytona 500.
Consumes 11.2 gallons of nitro methane per second at full
throttle.
Dual magnetos supply 44 amps to each spark plug.
Capable of reaching over 300 MPH +... before you have completed
reading
this sentence.
Redlines at 9,500 RPM ...


only does 540 revolutions light to light in the quarter mile.

I want to quibble with the 540 engine revolutions for 1/4 mile.
But, the numbers tell the story.

Average drag tire is 30" tall, for a circumference of 94" or
7'10".
1/4 mile is 1320ft. 1320 ft / 7'10" equals 168.5 wheel rev's down
the
track. Assuming a final ratio of 3 to 1 (motor to wheel)
3 times 168.5 = 505 revolutions per 1/4 mile. (does not include
wheel
spin. Damn!
Mikek
Fun Fact.
When I was kid my grandmother lived 7 miles from Martin Dragway,
On Saturday nights we could hear the dragsters run the 1/4 mile
from her
house 7 miles away.

Yeah, 540 revs is not correct.

Could you back that up? I just showed you my numbers, were do you
think I went wrong?
I didn't think his number was right either, then I did the math.
Mikek

----------------------

iBoaterer just wants to argue about a difference of 35 rpms. Could
be due to wheel slip, could be that they used slightly different gear
ratios ... could be that the driver didn't keep it in perfect
alignment ... whatever. The point of the original post was that the
engine turns surprisingly few rpms in a quarter mile because of the
phenomenal acceleration.