Question To All The Gearheads?

[harlan stephens]

Son do you have anything better to do than follow me around sharp shooting every thing I say? Its not that hard to understand. Weight on a rotating mass...
Wich one is lighter?
#1Google this
timing chain or belt efficiency
#2Read
#3 learn

 

[CrimsonEclipse]

Son do you have anything better to do than follow me around sharp shooting every thing I say? Its not that hard to understand. Weight on a rotating mass...
Wich one is lighter?
#1Google this
timing chain or belt efficiency
#2Read
#3 learn

I did.
Didn't see a Timing Belts 1% better reference on anything reliable.

You seem to get your feelings hurt whenever someone questions you.
This forum purpose is the exchange of information.

If your reaction is caustic every time you are challenged, you are going to be a very angry person.

 

[ross]

I would like to see direct injection down the road and even higher compression, or maybe a turbo.

 

[skygazer6033]

I personally question the decision to use a chain rather than a belt. Chains last longer and are noisy. Belts are quieter but need to be replaced at 100,000 or so. For me replacing a timing belt is no big deal. If I had to pay someone to do THAT would be a big deal. My old Caddy has 4 camshafts, 3 timing chains and 245,000 miles and appears to be all original so the chains really do last.

 

[Bert]

I prefer timing chains. yes they're a bit noisier, but they last a lot longer under normal use, as well as keeping the specific timing of the cam and crankshaft in sync.
Having said that, timing belts have come a long way as far as durability and dependability. Kevlar is the biggest leap in lasting power. They're easier to change (usually), especially for those to take preventive maintainence seriously. The downside, timing belts still stretch out a heck of a lot faster under normal operation, than a timing chain ever will. IMO

 

[wheaters]

I've always liked timing chains more than belts due to their supposed longer life. But since my son had problems with his BMW 2.0D and we researched the background to this engine, I've been forced to reconsider. Thankfully for future Elio owners it seems to be a BMW specific issue, limited to that particular engine. Unfortunately, that particular engine powered many different models. I understand the problems were rectified in later cars by design changes.

 

[Bert]

There's good and bad motors when it comes to timing chains. The GM 2.2 from the 1990s for example. They used a timing chain and tensioner to keep it "right", due to the length between the cam and crank. (Push rod engine, durable but design flaws for the timing chain). The tensioners had a nylon cover where the chain rubbed on it, and it wore out on a regular basis. Two big culprits were a too small oil orifice lubricated the chain, or clogged up, depending a lot on how often the oil was changed, as well as how much outside contamination (dirt) made its way into the crankcase.
Secondly, besides the nylon cover, the tensioner relied on a temperature sensative spring to maintain the tension against the timing chain. OE replacement usually was best, as it seems the aftermarket spring tensioner goes slack after the motor cools off?
If that wasn't bad enough, the timing chain cover was machined to be TO close to the chain. Even though the "slack" was within tolorances, it would often rattle off the cover when speeding up, or downshifting to use the motor to slow down.
A supurb motor, with several, closely related, specification issues. Timing chain issues aside, the motor runs very well and several hundred thousand miles of good performance without "other" issues is common.

 

[harlan stephens]

Volkswagen and Dayco have worked in partnership to develop a belt drive operating in oil inside a diesel engine to replace current chain technology for the oil pump drive. It is engineered as a life time belt system. This new Dayco technology offers benefits of lower friction, improved NVH and reduced weight.Author(s): Tommaso Di Giacomo; Stefan Brandin; Franco CipolloneSource: MTZ worldwide Edition: 2010-12

Preview

wonder how the new belt on oil bath.
Idea will pan out?

 

[Bert]

LOL! new tech? I was under the impression you distrust new technoligy?
But yes, it will be interesting to see how a "wet belt" internal timing control device works out..

 

[harlan stephens]

I love tech...and have said so many times
..bad tech that Is well marketed is still just bad...