Re: [Amc-list] 195.6OHV: things that are not going to happen

[Frank Swygert <farna@xxxxxxx>]

Yeah, my car (63 Classic, 4.6L stroker EFI six) pulls up to 5500 rpm. With 0.70 OD, 3.55 axle, and 26.3" diameter tires it would reach 173.2 mph, I'm right behind ya!! ;>

Sort of fun, but we all know that aerodynamic drag (wind resistance) and other resistive forces come into effect. It takes a LOT more power to make just a few more mph at high speeds. I seem to recall reading that NASCAR engines would require almost quadruple their current power to raise speeds by 10 mph?? I know it was a huge power increase for a little gain. This is the reason most OD cars will actually achieve a higher top speed in direct drive rather than OD -- to much drag for OD to power through. 

For anyone wanting to play with this the calculators are at www.4lo.com (and other places, that one's easy to remember!). Use the Tire Size calculator to get diameter (ignore the LT), then Gear Ratio to get speed (it will calculate whatever box you leave open). Put a "1" in the transfer case ratio since there isn't one. For top gear in most trannys you'll put a 1 in transmission ratio. The old BW OD is 0.70, and early AW4 (Jeep) is 0.70. You'll have to find the others, or just use 1 for whichever gear is direct drive (usually 4th with a five speed, 3rd with an auto OD trans). 

-----------------
Date: Sat, 22 Dec 2007 18:33:42 -0600
From: "Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>

Let's see.......
The Javelin has 2.87 gears in the rear axle, a T-5 manual with .63 overdrive
5th.
Tire circumference is 82 inches (255/45R-17) (26.1 diameter)
engine revs are 5500 speed is 203 mph. interesting, any one else come up
with some fantastic figures??
What, I'd need about 800 hp or more to do this??
that poor T-5 and AMC 20 axle..........he he he
GAWD them tires aren't rated for that !!!!!!

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

_______________________________________________
Amc-list mailing list
Amc-list@xxxxxxxxxxxx
http://www.amc-list.com/mailman/listinfo/amc-list