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Re: Auto Manufacturer Plot



On Thu, 6 Mar 1997, Al Powell wrote:

> Just a thought - howz come my beloved 1983 Datsun 280ZXT has a metal 
> timing chain which will probably last longer than I will...
> 
> BUT - seems like all the cars in the last 10+ years have these 
> stinkin' timing belts which need to be changed every 30-60-90K miles 
> depending on make and model?
Al,

	I can understand your ranting here, but I also see why they use 
those belts.   Belts are quieter than chains, cheaper to produce, smaller 
to package, lighter weight, and more efficient.   This last point allows 
them to design the serpentine belt systems which are so nice for 
packaging.  They also rarely stretch, which can be a problem with 
chains.   The tensioners on chain drives are usually much more 
complicated than on timing belts.

> But geez, if I were designing a new engine, I think I would opt for 
> parts that didn't have a designed-in "self destruct" well within the 
> mileage the car would get in its first 5-6 years of use!!

	I agree with this basic premise also, so I guess the only logical
conclusion is that there must be a better design solution out there that
exceeds both chain drives AND timing belt drives. 

Later, ---------------------------------------------------------- 
Graydon D. Stuckey 	'85 Mazda RX7 GS, no toys 
graydon@apollo.gmi.edu 	'86 Audi 5000 CS Turbo Quattro, has toys
Flint, Michigan USA	'89 Thunderbird SC, lotsa toys