[DML] Re: Angle Driveless Speedometer
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[DML] Re: Angle Driveless Speedometer



I am training to become a social studies teacher, not a math teacher, but let's try to figure this out:

Original angle drive does indeed spin the speedo cable -- more or less -- 12.5 percent faster than the spindle cable. But Dave's speedo is already reading 10 percent low to begin with. Does that not mean he needs an angle drive that spins his speedo cable 25 percent faster than the spindle cable for correct gauge readings? Wouldn't a 1:1 direct drive ratio be 20 percent lower than the speedo cable rotation he in fact needs? Any math teachers out there better able to double check my calculations?

In any case, Dave does not need a reduction in speedo cable rotation speed, which is what direct drive does.

BTW: Anyone who claims that a tach xRef chart is preferable to a functioning speedometer of any sort is crazy. Having burned through several Smith's Industries drives (all of them previously used before given to me, usually because of unwound spindle cables), using tach xRef charts in the down times, I know what I'm talking about. In fact, failed angle drives became such a common occurrence that I formatted my own tach xRef chart that can be read at a glance taped to the instrument cluster lens over the dead speedometer (doing that allows you to read the chart at night as illumination shines through it): http://groups.yahoo.com/group/dmcnews/photos/album/811886439/pic/1844765300/view?picmode=large&mode=tn&order=ordinal&start=1&dir=asc

Note that a tach xRef chart gives you absolutely no odometer readings. My odometer may currently be reading slightly more than 10 percent low, but that is  90 percent better than it was reading! 

Which begs the question: With angle drive failures so common, how does anyone know true mileage accumulated by a DeLorean? I've driven mine at least 10,000 miles further than the odometer indicates. 

As stated, I am hoping to become a public school teacher. Such a career is low paying to be sure, but it should yield enough money to buy an angle drive of some sort. Until then, I do at least have a functional speedometer AND odometer, the discrepancies of which are already known and can be adjusted for. No modifications have been made to the car at all. My lower speedo cable is intact, waiting patiently on a shelf for better days. I did cut the gear housings off one of my dead Smith Industries drives, but its spindle bushing was unacceptably oblong to begin with. I was able to tap it to 1/8" NPT however, so it holds an instant tube fitting quite nicely.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Tom Neiland <tneiland@...> wrote:
>
> 
> Wouln't that be 12.5% off?
> 
> 
> 
> Tom Neiland
> 
> tneiland@...
> 




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