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Old 01-31-2018, 05:25 PM   #1
Shinare
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2009 Yaris Timing Belt or Chain?

And also, Interference or non interference engine? A lot of Toyotas seem to be non interference engines.

Just wondering.


Side question, Since you CAN design an engine to be non-interference, why would anyone ever NOT do that?
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Old 01-31-2018, 08:09 PM   #2
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Timing chain. They can design them to be noninterference but the engine might have issues meeting emissions as the notches required in the pistons might mess with the combustion process. Might even be more prone to spark knock too. There's a lot of science in these new engines.
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Old 01-31-2018, 08:18 PM   #3
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2009 Yaris Timing Belt or Chain?

There is a really really small amount of engines that does not interfere with the pistons in case the timing chain brakes.
But anyway our timing chain is good and it can last reaaally Long without need replacement.
Unlike group vag with the 1.2 and 1.4 tsi engines 50.000 and u need a new timing chain kit

I don’t know if my 1NR-FE dual vvti eurospec engine interferes or not


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Old 01-31-2018, 10:06 PM   #4
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I would imagine in US, Japanese and Euro markets that Toyota have switched to almost entirely interference engines to squeeze 1-2% better fuel economy and emissions out of them. I know the belt driven GR engines (The V6 unit) in the 90's and early 00's were none interference but later versions did away with it.

All the Yaris engines I know of. 1KR, 1SZ, 2SZ, 1NZ, 1ND, 2ZR are all chain driven engines.

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Old 01-31-2018, 10:53 PM   #5
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Quote:
Originally Posted by Shinare View Post
Just wondering.


Side question, Since you CAN design an engine to be non-interference, why would anyone ever NOT do that?
If you want a more efficient and powerful NA engine then it will run interference if the owner decided to forgo changing a timing belt at the scheduled interval.

Building an engine to not be an interference type would make for a sub par performing engine with low compression for the only purpose of letting owners neglect car maintenance and lead to as little damage as possible.

This is why there are so few non interference engines in modern cars.
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Old 02-01-2018, 12:37 AM   #6
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Quote:
Originally Posted by miiser View Post
But anyway our timing chain is good and it can last reaaally Long without need replacement.
How long is really long? Should it be replaced at say... 300k miles? I remember on some of the old 90's model american cars, the chains would eventually stretch and need to be replaced. It was usually around 150k miles.
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Old 02-01-2018, 06:39 AM   #7
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Quote:
Originally Posted by zoidberg444 View Post
I would imagine in US, Japanese and Euro markets that Toyota have switched to almost entirely interference engines to squeeze 1-2% better fuel economy and emissions out of them. I know the belt driven GR engines (The V6 unit) in the 90's and early 00's were none interference but later versions did away with it.

All the Yaris engines I know of. 1KR, 1SZ, 2SZ, 1NZ, 1ND, 2ZR are all chain driven engines.

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And 1NR-FE which is the 1.33 L dual vvti engine


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Old 02-01-2018, 06:41 AM   #8
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2009 Yaris Timing Belt or Chain?

And 1NR-FE which is the 1.33 L dual vvti engine

Also I thing that all the non-interfere engines were build with collaboration with Yamaha.






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Old 02-01-2018, 06:47 AM   #9
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Quote:
Originally Posted by BennyLava View Post
How long is really long? Should it be replaced at say... 300k miles? I remember on some of the old 90's model american cars, the chains would eventually stretch and need to be replaced. It was usually around 150k miles.


I think that 150k miles is a fair amount of miles that the chain can handle. Always depends on the driver tho. Hard accelerations and cold starts without letting the engine warm up, might damage the chain a lot faster


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Old 02-01-2018, 07:24 AM   #10
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Maintenance is key. Members have gone 400k miles with the same chain here.

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Old 02-01-2018, 07:58 AM   #11
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Maintenance is key. Members have gone 400k miles with the same chain here.

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I agree. With decent maintainance and a little luck the average Toyota chain will outlive the engine. At least on the smaller 4 cylinder units.

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Old 02-01-2018, 08:10 AM   #12
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I would imagine that you would have vvt codes (caused be a loose chain) way before it breaks.
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Old 02-01-2018, 09:35 AM   #13
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Originally Posted by ex-x-fire View Post
I would imagine that you would have vvt codes (caused be a loose chain) way before it breaks.
Agreed, or at least some time of cel related to the timing being off. Chains typically don't break they just stretch and cause issues that way.

Fwiw, my old '02 Echo had 375k km on it when I pulled the timing cover to do the head gasket for shits and giggles. I never bothered replacing the chain since everything was still functioning and looked great. Ran fine for another 10k km before we bought a new used car that was big enough to comfortably for a stroller
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Old 02-01-2018, 09:56 AM   #14
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interference for 1NZ-FE. Toyota Yaris piston valve.

So far, seems to be guessing on interference for 1NZ-FE. Toyota Yaris piston valve.
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Old 02-01-2018, 11:10 PM   #15
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interference/non-interference comes down to cost of materials and engine performance. the difference between having the piston TDC 25mm shorter distance (increasing the combustion chamber size) and maintaining the same compression ratio will require addition of stroke to the crank. adding stroke is going to increase rod ratio. increasing rod ratio results in a longer duration of TDC. longer duration of TDC with increased rod ratio results in torque increase, but lowers the torque curve and over all engine speed, which also lowers horse power.
basically, the smaller the combustion chamber, the faster an engine can perform/turn. the smaller the rod ratio, the less materials have to be used. the less materials used, the lighter/cheaper the engine.
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Old 02-02-2018, 01:06 PM   #16
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Very good to know. At least it is a chain and not a belt. Had to change the belt in my wife's subaru and cost me $1,600. And that has to be done every 110k miles. I'm headed close to 100k in the yaris and was worried about belt/chain and if I could let it snap or not. hehe
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Old 02-03-2018, 04:45 PM   #17
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wow. you sure did git ripped off. did they remove the heads too? if it was just the belt it should only about half that... (even a quad-cam)
at 100,000 you should think about water pump replacement, drive belt replacement. that's about it assuming you've done trans fluid and spark plugs already. if not, those too. take a peek at brake pads, maybe brake fluid? (i do it every 2 years)
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