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nissan720

double roller timing chaun

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just wandering why nissan didn't use a double roller timing chain set up in the ka24 engine.did they think it might last to long and they not sell enough trucks or parts. just food for thought.

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I know people replace their timing chains but Nissan provided a means to adjust them for wear. I know of no one who has ever worn one out that they can't be adjusted properly. As far as I'm concerned they are bullet proof. They are over kill, over engineered and will last forever and never break. Can't say the same thing for the rubber covered guides and the tensioner though. 

 

Henry Ford used to drive around to wrecking yards in the 30s and he would ask the owners "what part on my Model T does no one ever come in here and buy? What part never wears out?" They all said the tie rod ends. So Henry goes back to his factory and calls all the engineers in, and he tells then this... "Make the tie rod ends thinner, make them smaller. I'm not paying good money to make something that outlasts the rest of the car". A single roller chain works well enough as proven by billions of KA miles. About the time the chain guides and tensioner wear out it's probably a good idea to change the chain too.

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I bet its cost and didn't really need it as most cars used the single

Toyota and Datsun and Mercedes used them early on(double)

 

 

chevy 350s used single chain. didn't bother them

Edited by banzai510(hainz)

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There is no sense making something capable of 750,000 miles when the rest of the car only lasts at best 250,000 miles. Why not have enough wear to require replacement about the time the guides need replacing? Cost absolutely! Customer pays less and maker makes more and competitive with other makers who use a single row. It only has to last slightly longer than the first owner has it and trades it in.

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I remember early Datsun ads for the 510, that pointed out that the engine had a double row timing chain, and not a belt.

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My son was p+++ed to discover that my 67 Datsun had double row timing chain and his 1970 Camaro had only a single row chain.

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