Re: [Healeys] Transmission OD - 22% vs 28%

[David Nock <healeydoc@sbcglobal.net>]

I would suggest that you take a look at this site before you decide  
which  set up to go with.
Assuming the choices with a tire diameter of 25.5 "
Also remember that the Healey motor runs best in a rpm range of about  
2800 to 3000 rpm
If you get to slow the spinning mass of the engine will be slow to  
react.


        Rear axle ratio         O/D ratio       RPM             Mph
                3:54                            28%     2000            59
                                                                        2500    
        74
                                                                        3000    
        89
                                                                
                                                        22%     2000            
55
                                                                        2500    
        68
                                                                        3000    
        82

                3:90                            28%     2000            54
                                                                        2500    
        67
                                                                        3000    
        81
                                                        
                                                        22%     2000            
50
                                                                        2500    
        62      
                                                                        3000    
        74

                4:11                            28%     2000            51
                                                                        2500    
        64
                                                                        3000    
        77

                                                        22%     2000            
47
                                                                        2500    
        59
                                                                        3000    
        71
                

You can go to this web site and put all the info that you want  
depending on what size tires you have.

http://www.angelfire.com/fl/procrastination/rear.html



David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767

www.britishcarspecialists.com
.
.

On Feb 21, 2008, at 7:11 AM, John H wrote:

> Listers,
>
> I am swapping tranmissions in my BN7.  One coming out is a 22% side  
> shift.  The one going in is a 28% side shift and just rebuilt.  
> Bundled with my 3.54 Lempert gear set should give me great cruising  
> capabilities on demand.
>
> Question:  the 22% has an enclosed area with a removable cover  
> where the solenoid shaft engages and disengages the OD (to keep  
> debris and moisture out, I assume)  The 28% does not have this  
> enclosure leaving it exposed to debris and moisture.
>
> The parts manual shows only a metal deflector (called a stone  
> gaurd) in front of the solenoid.  Is this correct? and is there a  
> way to convert to the enclosed version, which seems safer in the  
> long run?
>
> Thanks in advance,
>
> John Homonek
> Atlanta Chapter AHCA
> 1959 BN7
> 1960 AN5
> 1974 Jensen Healey
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