<VV> 4-speed transmission/OD 4th

Sat Oct 31 14:40:23 EDT 2015

Back to the Chrysler solution, what they did is they made '3rd' the OD gear, and 4th became 3rd, and the OD gear became 4th. Basically reversing 3rd and 4th. I suppose you could do this with a late Sag and go to a three rod shifter and the standard front engine side cover...

John Roberts

-----Original Message-----
From: kevin nash via VirtualVairs <virtualvairs at corvair.org>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Sat, Oct 31, 2015 12:41 pm
Subject: Re: <VV> 4-speed transmission/OD 4th

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
> 

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