Gene
Your problem is going to be that OD ratio. It's a terribly wide split from 1
to .80, but with the big blocks torque perhaps it will still pull. I suspect
it will have very little exceleration after the 2 mile wich will make it
lots of fun to drive.
JB
----- Original Message -----
From: "Gene Halvorson" <ghalvorson@earthlink.net>
To: "Land speed newsgroup" <land-speed@autox.team.net>
Sent: Tuesday, June 26, 2001 12:00 AM
Subject: gear selection & tires
> Keith,
> The way I approached it is that I determined how fast I wanted to go. My
> gear selections are limited so I got the highest ratio available and then
> determined how large a tire I needed to the MPH to work out right.
> That equates to 205 mph with a 3.08 rear gear, a overdrive at .80 and a
> 27.5 diameter tire at 6,172 engine rpm. Now all I have to do is build
> enough power to get the motor to spin that fast.
>
> We have all watched the discussions on comparing types of rear ends but
> there hasn't been much on the horsepower losses between different ratios.
> I suspect, that the mathematical transmission losses between a higher
ratio
> and lower ratio AFTER the wheel diameter are insignificant. The variable
> will be the calculated friction between the gears and bearings.
>
> I myself would favor a slightly lower ratio and a larger diameter tire,
> believing that it's better to have the largest tire diameter possible.
> Less rolling resistance and slower turn speed at the tire surface.
>
> So if you have two different combos, find the chassis dyno and run a low
> gear/big tire and high gear/small tire test. Back to back runs with quick
> gear changes so the atmospheric changes are minimal. That is the only way
> we will really know how the combos affect rear wheel horsepower.
>
> I'll take an XL.
> GH
>
> --- Gene Halvorson
> --- ghalvorson@earthlink.net
> --- EarthLink: It's your Internet.
///
/// land-speed@autox.team.net mailing list
/// To unsubscribe send a plain text message to majordomo@autox.team.net
/// with nothing in it but
///
/// unsubscribe land-speed
///
///
|