Watch out! Many Japanese products use timing belts with non-free running
(interference) engines. When, not if, the belt skips or breaks, your
engine and $8,000 is gone. Even if you get through the warranty period,
the resale takes a big hit because the word has got around.
Auto makers, heed this warning. The public knows gear, shaft, or chain
driven single or double OHC engines are are safe design. Timing belt driven
setups are not.
Suzuki is an exception. Their cars are okay.
Like it's not trolling to multiple post this in honda, toyota, nissan
Kind of like the number of post mid 90's model 4 cyl. Nissans offered
for sale on web auctions here, where the owners claim that the timing
belt has just been replaced...
What happens with a stretched or broken timing chain? I have 110k miles on
2002 K20A3 and I had belted Honda before this. Still runs great and I guess
it was kinda cool I didn't have to do or pay for the timing belt service.
What's the downside and eventual maintenance of timing chain?
First the chain wears ie gets slightly longer, and the cam + drive gear
teeth get worn as well. The chain starts to chatter, and the valve timing
goes off a bit. Timing chains seldom if ever break unless the lubrication
system fails, at which point the chain gets REALLY noisy. If left long
enough, the lubrication failure may affect the cam bearings or even main or
big ends. I've never seen a chain break on the old BMC A and B series, Ford
Cortina 1500/1600 engines and an E-type Jag engine I worked on years ago.
Just about everything else let go, but not the chain ...
An severely overreved engine would sometimes stretch the chain and throw the
valve timing really off.
#1 problem is chain stretch - that leads to cam timing issues and noise.
belts are quiet, highly reliable within their stated mileage limit,
and don't stretch. long term, you'll get more out of a well maintained
belted engine than what is basically supposed to be an unmaintained
Newer timing chains appear to be much improved. Several people in the Prius
forums I frequent are right around 200K miles and have not had timing chain
problems. There is no schedule for changing the chain, either. Disclaimer -
not enough data for a positive answer yet.
well, chains work, but belts are a better technical solution.
particularly for high performance engines - less momentum and angular
don't forget, design criteria these days are all about life limitation
and cheapness - chain wins on both counts.
I guess it comes to how well built the motor is, belt or chain. Fact
is, Nissan VQ V6es are legendary, reliable timing chain motors. They
just don't die. Even the SR20s, KA24s and GAs seem to hold up quite
well. All timing chain motors. Honda and Toyota make great, long
lasting timing belt motors.
6 of one, 1/2 dozen of the other. I've had a timing gear fail, I've
had chains fail, I've had timing belts fail. I kinda prefer the
timing belts all in all, quieter, better valve timing. I've never seen
a chevy V8 that didn't have a lot of slack in the timing chain after 80K
I had a 1970 Volvo with timing gears. One day I was driving home from work
and heard the unmistakable sound of a bad rod knock. I towed the car home
and lifted the engine to drop the pan, then found... nothing. Huh. Pulling
the crank through I heard the "bang" as plainly as I heard it while driving.
Double huh. It seemed to be coming from under the timing cover. There I
found the cam gear's fiber outer ring had separated from the steel core, and
was lifting up and dropping every revolution... bang!
145. The odometer must have been about 260K at the time. I asked at the
dealer if a steel gear was available, and he said he had one. He had sold it
several times but it always came back because it was so noisy. Makes sense,
I guess, and after thinking about it I figured the car wasn't likely to
outlast the composite replacement gear.
Studebaker used a fiber (phonolic) cam gear and steel crank gear.
Failure is almost unheard of at least before 300K. High performance
engines were equipped with an aluminum cam gear.
Volvo was not the most dependable foreign car made. I can tell some
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