This is my proof that the tundra 5.7 liter has a timing belt
The 5.7 uses a timing belt
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flc2006
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Toyota engineers were smart enough to install a chain to spin the cams in the 381 HP 5.7L V8 motor. I love the no maintenance and durability of a chain driven camshaft. Yes, it's a DOHC design with a total of 16 intake and 16 exhaust valves, 32 valves total. Anyone who buys a new Tundra WITHOUT this jewel of an engine under the hood is crazy. That motor alone makes me want to purchase the truck. SWEEEEEET!!! This engine is Lexus smooooooooooth and blows away the competition.
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Lexus and Toyota do share similar design's at times.The New Ls has the world's first 8 speed auto Transmission and who's to say that 8 speed will end up in a tundra very soon. About the 4.7liter and 5.7 liter there Both well made engines I can't find any fault on both . The Engine picture above was taken from Sano when we attended the Detroit auto show the display showed how the tundra was made and the part's lined up which set's them up vs the competition. I think it's funny how the Ram guy's looked at the Tundra Like Jeez they copied our front end design..
(picture in a few)
The picture below is the New Lexus Ls 460 8 speed transmission (as showen it's on gear number 1 on the display)
yeah i agree, timming equipment isnt under the same load... so rubbers have a Life to them the chains do last longer in the engine
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I don't know if the loads are similar, but you can bet that a timing chain will see some massive loads as a function of revving. For example, if you snap the throttle open in neutral, you can move from 1,000 to 3,000 rpm in less than 1 sec. That's a lot of force (f=ma).
The motorcycle example is very instructive in that chains require constant maintenance and have a very limited service life compared to the belts. Unlike timing chains, cycle chains are exposed to dirt, debris, and water and are not constantly bathed in oil.
There's nothing wrong with belts...they're quiet, keep time very well, and are durable. Modern timing chains work well, too. Expect more noise, especially if the wrong oil is used or oil service intervals are too long.
Hey, you have to drive camshafts somehow. If people are worried about chain drives, what the heck else would you use? Geartrains have been used on some engines but they are noisier than heck (and the most expensive method as well). Allison aircraft engines of the WWII era used bevel geared shafts (as some early Honda motorcycles used), but I imagine they are not very efficient.
I would MUCH rather have a chain camshaft drive than a belt ANY day.
More importantly, though, didn't anyone notice that the new 5.7 has HYDRAULIC LIFTERS? About freakin' time is all I gotta say.
JMHO
Dan
I would MUCH rather have a chain camshaft drive than a belt ANY day.
More importantly, though, didn't anyone notice that the new 5.7 has HYDRAULIC LIFTERS? About freakin' time is all I gotta say.
JMHO
Dan
I will not own a vehicle that has a timing belt. I saw too many of those things break and leave people stranded back in the 1980's. There's no functional advantage to a timing belt and you have to replace them at regular intervals ($$$$$), tell me how that's good engineering? Contrary to some of the posts here timing chains are not noisy. I challenge anyone to listen to any motor out there and honestly tell me that they can hear the timing chain, they can't.
Just to add clarity. The 5.7L iForce uses timing chains. Please see the below chat with tundra specialist via the following link on Toyota.com: Live Assistance
Chat text:
Jonathan:Hi, my name is Jonathan. How may I help you?
Jonathan: Welcome to Tundra Chat. How may I help you?
You: Jonathan, I am looking to buy a new double cab and there seems to be one piece of conflicting information I would like to clarify. Does the 5.7L iForce come with a timing belt or dual timing chains
Jonathan: Please hold while I research that for you, thank you for your patience.
Jonathan: The 5.7 V8 comes with a timing chain and two sub chains.
You: awesome... thank you for the clarification
Jonathan: No problem. May I answer any other questions about the Tundra for you?
You: No... i think that was the lat one in needed
Jonathan: Ok, glad to be of help. Thank you for visiting Tundra Chat. Please contact us again.
***** Jonathan Has Disconnected
Chat text:
Jonathan:Hi, my name is Jonathan. How may I help you?
Jonathan: Welcome to Tundra Chat. How may I help you?
You: Jonathan, I am looking to buy a new double cab and there seems to be one piece of conflicting information I would like to clarify. Does the 5.7L iForce come with a timing belt or dual timing chains
Jonathan: Please hold while I research that for you, thank you for your patience.
Jonathan: The 5.7 V8 comes with a timing chain and two sub chains.
You: awesome... thank you for the clarification
Jonathan: No problem. May I answer any other questions about the Tundra for you?
You: No... i think that was the lat one in needed
Jonathan: Ok, glad to be of help. Thank you for visiting Tundra Chat. Please contact us again.
***** Jonathan Has Disconnected
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154 Posts
I have a 3 series BMW, and it has a chain not a belt and my BMW is as smooth or smoother running then any belt driven engines. Personally give me a chain any day. I have had bad experiences with belts. I am glad the new Tundras are chain driven. Toyota knows what they're doing. They aren't soon to be #1 for nothing.:tu:
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That right there is just sick. I think it's official, rather than build up the 4.7, I'm gonna find a way to shoehorn a 460 drivetrain and computer in the 00. Be a few years, tho...
-S
Well, you see, that's why they use hydraulic tensioners. The fact that guides wear and chains stretch necessitate the need for hydraulic chain tensioners. If all of these parts were static they could just use solid tensioners and never have to worry. Now, stretching like mad is an extreme overstatement for a chain. A timing chain stretches far, far less than a timing belt. Rubber versus steel, use some common sense man.
Wrong. Those oil fed hydraulic tensioners take up what little slack wear imposes on the timing chain setup.
What world do you live in? Obviously it isn't this place I like to call reality.
A timing belt is far, FAR more likely to fail than a timing chain. Once again, rubber vs. steel in a high temp scenario.
Pure ignorance. :td:
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Good post. I like you now LOL
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my manuel says replace belt at 90k miles (2UZ-FE) fact
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They take the slack up on the "loose" side of the chain. The chain strech (very little) is still happening between the crank and cam sprocket on the tight side, which could be a problem on some engines; however since this engine has -closed-loop- vairable valve timing, it can target specific cam timing even with chain stretch (within reason).
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These are the facts based on what I've learned in school and as an ASE A1-A8 tech (master).
Chains do stretch and the sprockets (especially the teeth) wear down causing the engine cam timing to be effected over a long period of time; how much depends on the design and length of the chain. Generally timing chains last much longer than timing belts and that is their advantage.
Timing belts also stretch initially when they are new a little bit but not as much as a chain does. They tend to take a set and stay that way after the initial break in. Just take an old timing belt and compare it to a new one and you’ll see what I mean. They are not just made up of rubber! They are kind of like tires where they have steel reinforcing in them and other materials. The timing sprockets hardly wear at all and engine timing tends to stay truer and is more accurate when an engine has a timing belt. Their disadvantage is that you have to change them at regular intervals.
As with anything these are just general rules of thumb and things like engine reliability have more to do with regular maintenance, different Manufacturers and the quality of the parts than anything else. I personally prefer belts but just because an engine has a timing chain would not stop me from buying the vehicle with it; this is especially true with a jewel of an engine like Toyota’s new 5.7-liter V8.
O and the 5.7 V8 has a chain!
Chains do stretch and the sprockets (especially the teeth) wear down causing the engine cam timing to be effected over a long period of time; how much depends on the design and length of the chain. Generally timing chains last much longer than timing belts and that is their advantage.
Timing belts also stretch initially when they are new a little bit but not as much as a chain does. They tend to take a set and stay that way after the initial break in. Just take an old timing belt and compare it to a new one and you’ll see what I mean. They are not just made up of rubber! They are kind of like tires where they have steel reinforcing in them and other materials. The timing sprockets hardly wear at all and engine timing tends to stay truer and is more accurate when an engine has a timing belt. Their disadvantage is that you have to change them at regular intervals.
As with anything these are just general rules of thumb and things like engine reliability have more to do with regular maintenance, different Manufacturers and the quality of the parts than anything else. I personally prefer belts but just because an engine has a timing chain would not stop me from buying the vehicle with it; this is especially true with a jewel of an engine like Toyota’s new 5.7-liter V8.
O and the 5.7 V8 has a chain!
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Failure of Toyota timing belts and chains is virtually unheard of (unless vehicle was abusively driven or neglectfully maintained) so both mechanisms can be considered extremely reliable.
Advantages of Belt Driven Toyota overhead cam engines:
1. Timing belt doesn't stretch so cam timing never becomes retarded
and the timing belt never needs to be retensioned.
2. Are usually quieter engines
3. Timing belt can be replaced in an afternoon.
Disadvantages:
1. Requires replacement every 90,000 miles if car is driven hard, 120,000 miles if driven calmly, 150,000 miles is vehicle is driven calmly primarily on level highways.
Advantages of Chain Driven Toyota overhead cam engines:
1. Lasts 2-4 times as long as a timing belt before the chain and associated
parts need replacement. 600,000 miles of life is possible if vehicle is driven calmly primarily on level highways.
Disadvantages:
1. Chain stretches over time, causing a gradual retardation of valve timing.
2. Twice as much time and labor is generally required to change a Toyota chain mechanism
Advantages of Belt Driven Toyota overhead cam engines:
1. Timing belt doesn't stretch so cam timing never becomes retarded
and the timing belt never needs to be retensioned.
2. Are usually quieter engines
3. Timing belt can be replaced in an afternoon.
Disadvantages:
1. Requires replacement every 90,000 miles if car is driven hard, 120,000 miles if driven calmly, 150,000 miles is vehicle is driven calmly primarily on level highways.
Advantages of Chain Driven Toyota overhead cam engines:
1. Lasts 2-4 times as long as a timing belt before the chain and associated
parts need replacement. 600,000 miles of life is possible if vehicle is driven calmly primarily on level highways.
Disadvantages:
1. Chain stretches over time, causing a gradual retardation of valve timing.
2. Twice as much time and labor is generally required to change a Toyota chain mechanism
Thank you. Your pic has become my wallpaer.
Agreed.
Timing belts are known to stretch with rpm thereby retarding the cam timing at high rpm. Although retarding cam timing at higher RPMs can be beneficial.
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I'll accept that challenge. I'll lay down a $100 bill and pick out any idling vehicle with a chain. If I'm wrong, you pick up the money. That's not to say a timing chain is bad. It isn't. I also would not say it is noisy. Most folks will never hear anything different, but if you know what to listen for -and I do - you can hear it.
It is for sure a chain, I emailed Toyota, they said it was.
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for the last time, it's a freaking timing belt, would you like to buy me dinner
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