<VV> 4-speed transmission/OD 4th

[kevin nash]

Another interesting point about this set-up- my piston speed when running at 70 and 3000 rpm
is like a late engine running at 2000 rpm, and even if my pistons were big enough to make the
displacement the same as a late (approximately 92mm), the piston speed would still be exactly
like a late engine running at 2000 rpm, and would seem to me another way of achieving a desired result, without messing with the transmission.
Kevin Nash
63 EFI Turbo, Daily driver
 
From: wrokit at hotmail.com
To: virtualvairs at corvair.org
Subject: RE:4-speed transmission/OD 4th
Date: Thu, 29 Oct 2015 19:36:41 -0700




For what it is worth- I have a 3:08 ring and pinion and 64-65 4 speed and I'm currently
running 175/13 tires, and my rpm's to go 70 are 3000-3100. I've had a chance to compare
the gearing with my 2002 Pontiac Sunfire, as it also has a tach. What's interesting is that
my Corvair generally runs at 1750 at 40 in fourth on flat level ground, and the Sunfire runs
at 1500 on flat level ground at the same speed. Also, to compensate for the taller gearing,
I've lightened the car close to 200lbs which gives me a more favorable torque to weight 
ratio than it had with the stock 3:55 gearing, tires and weight, so it accelerates more like it 
has been geared down a little. Super fun to drive, although I haven't had it on the highway 
yet. And yes, the EFI helps, ALOT!
Kevin Nash
63 EFI Turbo, Daily driver


> 
> Message: 5
> Date: Thu, 29 Oct 2015 16:24:04 -0400
> From: DickR13607 at aol.com
> To: virtualvairs at corvair.org
> Subject: <VV> 4-speed transmission
> Message-ID: <180582.1c0b48af.4363da64 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
> 
> I followed the discussion on overdrive transmissions with considerable  
> interest.  I would like to know if anyone has thought of using a Corvair  
> 4-speed case, putting the 3-speed gears in it, and making new overdrive fourth  
> gear?  I have no idea if it would work, but if not, why not?
>  
> Richard Royle
> 66 Corsa Turbo
> 
> ------------------------------
> 
> Message: 6
> Date: Thu, 29 Oct 2015 17:24:44 -0400
> From: Matt Nall <patiomatt at aol.com>
> To: virtualvairs at corvair.org
> Subject: Re: <VV> 4-speed transmission / OD  4th?
> Message-ID: <150b57d1156-3022-a0f9 at webprd-m45.mail.aol.com>
> Content-Type: text/plain; charset=utf-8
> 
> 
> 
> 
> I followed the discussion on overdrive transmissions with considerable 
> interest.  I would like to know if anyone has thought of using a Corvair 
> 4-speed case, putting the 3-speed gears in it, and making new overdrive fourth
> gear?  I have no idea if it would work, but if not, why not?
>  Richard Royle
> 66 Corsa Turbo
> 
> ===========================================================================
> 
> 
> You can do just as well with a set of 3.08's and the proper year model  4 speed....just not a total of 5 speeds.....we actually could use eight!
> 
> 
> Corvairs just don't make torque below 2500 rpm  and the cooling fan,  in hot areas, needs more rpm to adequately cool.
> 
> 
> Matt Nall
> Charleston, Oregon
> http://tinyurl.com/The-Corvair-Patio
> 
> http://tinyurl.com/Matts-Tech-Pages
>