<VV> 3.08 gear experiences

[Bruce Schug]

On Apr 4, 2008, at 7:59 PM, NicolCS at aol.com wrote:

>
> Bruce asked:
> <snip>What size tires do you run on this car - I'm wondering what  
> diameter
> you're using. I've seen you write about this car before. This is a
> really neat setup.Bruce W. Schug <unsnip>
>
> The 3.08/3.65 EFI car has 205-60-15 tires
> The car with the PG140 with 3.08/3.65  has 195/65-14 tires.
>
> As I recall, in both cars, the OD of the tire is about 24 1/4".   
> When I get back home (next week) I'll measure and report.
> HTH,
>

205/60-15's are (mathematically) 24.69", as I recall. That's a pretty  
good size tire (remembering that 7.00-13's were about 25.3").

The 195/65-14's would be 23.98" (call it 24" ;-), quite a bit smaller.

I just wondered what effect your tire diameter had on your setup. The  
195's would change your 3.08 to an effective 3.25 ratio, compared to  
using a 7.00-13. But the Powerglide has the torque converter to get it  
going.

The 206/60-15's, being taller only change the overall ratio to a 3.16.  
The 3.65's give you an overall 11.53.

By comparison, my car, with a 3.55 and 225/50-16, 24.88" rear tires,  
has an effective 3.61 rear ratio. With my 3.11 1st gear I end up with  
11.23 overall.

The moral of the story is, of course, your 3.65 more than makes up for  
the 3.08 in 1st gear!

(Hope all my math is correct.)

Bruce


Bruce W. Schug
Treasurer, CORSA South Carolina
Greenville, SC
Stock Corvair Group Member
bwschug at charter.net

CORSA member since 1980

'67 Monza. "67AC140"