[Healeys] Transmission OD - 22% vs 28%

David Nock healeydoc at sbcglobal.net
Thu Feb 21 10:15:41 MST 2008


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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