the lexus use a timing belt not chain. same with the 4.7 that was in the previous tundra, its belt driven. one theory is that the 5.7 use forged piston and rods. so when they heat up and expand the noise goes away.
Interesting.... my 1999 LX470 used a chain...... With that said, I like my diesel noise.... makes it sound better
__________________ 2007 CrewMax SR5 4x4 5.7Nautical Blue My Pictures
TRD Rear Sway Bar, Pioneer FH-P8000BT w/ Sirius, Carriage Works Black Replacement Grille + Top Insert, Color Matched Sequoia Door Handles, Bench Seat, Dual Headrest DVD, back up camera w/monitor, Nüvi 660, Line-x, undercover, Tekonsha P3, debadged, enjoyed since 7/20/2007
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25-30 ft Travel Trailer....... bye bye Pop-Up
IMO, regardless of the cause[s] of the "diesel" sound, the fact that it goes away after the engine warms up indicates it is normal and not a "problem"
Engine design coupled with thin oil = noisy until components reach operating temp.
I had a Chevy 400SB with forged pistons that sounded like it was coming apart every time you cranked it up cold and I mudraced and played in the swamps with that engine for 10 years without ever having to even pull a valve cover. One reason she lasted so long is that I never beat on it before the temp gauge hit 185deg.
I treat my Tundra [and my wife, for that matter] the same - go easy until she's warmed up.
__________________ 5.7L 2WD DC Salsa Red Pearl SOS/TR 2"/4" drop, 20 x 9 Incubus Shylock alloys, 295/45/20 Falken TZ01 tires , TRD anti-sway bar, Hella Optilux driving lights, Flowmaster 50 dual in/out w/baffled Hooker tips, LineX, DeeZee black diamond toolbox,filled color-matched grille shell w/CarriageWorks insert, Blacked-out headlights, 50 watt back-up lights in bumper, Rockford Fosgate T400-4 amp,Polk Audio speaker upgrade, single 10" MTX sub,Beltronics 955 radar unit.
Noise seems to be normal when compairing one Tundra to another. Noise is not normal when compating the Tundra engine to other engines. Similar situation as GM piston slap.
If you guys actually knew what kind of sounds an engine makes under load at higher rpms while being drowned out by induction, exhaust and road noise, you would probably lay an egg. When I worked as an engine builder I had the opportunity to analyze some of the racket that was picked up by a microphone on the engine block itself. Let me tell you even on a properly assembled and healthy hydraulic lifter street V8 running full tilt on a dyno, it sounds like it will come apart any second, but due to the other external noises you won't hear this without the help of special equipment. The little bit of noise the 5.7 makes when it's cold is nothing at all to worry about. I checked out several 5.7s on the dealer lot and heard the same cold start noise on all of them. The 4.7 is quieter because it's cams are belt driven and it's a shorter stroke engine with longer piston skirts, but there are also a lot of older 4.7s that exhibit the same cold start noise. The only time I'd be running to the dealer is if the engine didn't quiet down when it was warm. BTW, the 5.7 doesn't have forged pistons contrary to popular belief - they are hypereutectic.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
Noise seems to be normal when compairing one Tundra to another. Noise is not normal when compating the Tundra engine to other engines. Similar situation as GM piston slap.
A lot of the older gen 1 tundras had much worse piston noise and ran without any long term problems. I've seen many more GM V8s with broken piston skirts than 4.7 tundras (actually have only heard of 2 confirmed cases of lower end engine failure on 4.7s). The 5.7 is too new of an engine to make this comparison with, but I'd be willing to bet it will be a similar situation as the older 4.7
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
One reason she lasted so long is that I never beat on it before the temp gauge hit 185deg.
100% correct
The absolute worst thing you can do to any engine is run it full tilt when it's cold.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
The 3UR-FE has hydraulic, automatic valve lash adjustment.
The dual VVT-i system is very oil dependent. I get somewhat of a clacking, or knocking type sound from my 1GR that is louder when cold and only occurs at 1500-1800rpm on the throttle without load, and that's only VVT on the intake side in each head. It concerned me at first, and I made a video of it for sound purposes in case something ever happened, but nothing did. Our Tacoma's (and others) 1GRs are also plagued with the infamous exhaust tick under load when cold, which is more of an annoyance than anything. I wouldn't rule out those SS headers on the 3UR-FE. They may be thin enough to allow some of the sounds of the engine to escape.
Unfortunately, the VVT-i system cannot adjust the valves with low oil pressure, which is the main reason Toyota developed VVT-iE, or electric motor driven VVT on the intake side, to adjust the valves even at startup and during times of low oil pressure.
Also keep in mind that this is an open deck engine series, and the 3UR is not a typical big bore engine either. It uses quite a lot of stroke to accomplish its 5.7L (102.11mm). In fact, the 3UR uses the exact same bore as the older 4.7L 2UZ, which is 94mm, so these aren't overly large pistons moving up and down. The cylinder bores are cast WITH and are PART of the engine. Piston slap would be extremely noticable with an open deck engine and it'd clearly come from the bottom end. Since the deck is open, the piston slapping sound from the cylinder bores would reverberate up and down the block making it even louder. It would also, possibly, cause a longetivity issue, since the cylinder bores have no block casting around them. Toyota typically inserts a hard, temperature resistant piece of plastic between the block and the cylinder bores. Hardly enough. The piston skirts are also coated with a wear resistant moly resin. Piston slap could chip that away, and the engine would see increased friction.
Toyota uses very tight clearances, which is why you can use a 0W-20 oil and not see oil consumption. Try doing that on a worn engine and see how long that lasts.
Didn't know some of that info, thanks for that. Where did you get info on the open deck system, how it works and thats is in fact on the Tundra? I truly still doubt that this is a problem and that it is just noise.
Josh
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2008 Salsa Red Pearl DCSB SR5 2WD
Corsa Sport Single Exit, Doug Thorley's, 20% Tint up front, Line-X, Access Roll-Up Tonneau, Alpine Touchscreen Nav, Sirius Satalite Radio... VA 757 Area Group MEETS
Future Mods: Color Matches Grill, Lowering Kit, TRD CAI, Wheels, Fender Flares, Supercharger, JL Stealthbox, Black Headlight Mod...
Has anyone out there owned a high performance car from the mid 60’s to the mid 70’s? I have owned two high performance Chevy's, one a 67 Malibu with the L79 small block (325 horse) and a 70 1/2 Z28 with the original LT1 (360 horse) engine. Both of these engines had 11 to 1 compression and forged aluminum pistons among other high performance goodies. These type of pistons are “cam machined” meaning they are machined to be slightly egg shaped when cold, especially in the skirt area. As the engine heats up the aluminum piston expands and the “slap” goes away. I just got my Tundra recently and have the same sound that my Chevy hi pos had. It goes away after it warms up. I have absolutely no doubt that is the same reason. Another possible reason it is more noticeable is that we have an aluminum block, which will transmit sound more readily. It boggles my mind that Toyota has put a such an engine in a truck!! I wish they wouldn’t have as I would have kept my trusty old F250 until the wheels fell off!! Just enjoy your “hi po” and don’t worry about the “slap”.
alot of folks on here just like to say "its a truck" or "toyota makes it, it has to be perfect" fact is other motors dont sound that way, fords tailgates dont break if you load a fourwheeler, or shake ur teeth out when you hit bumps on the highway.
I always remember aluminum blocks NOT transmitting sound more readily. It's the cast iron blocks that do. Ever heard ping in an aluminum block, then in a cast iron block. Aluminum block sounds like a bunch of quick tapping where the cast iron block pings and echos badly giving that tell tale shaking a jar of marbles sound that everyone speaks of. Just clarifying, I do think that it COULD be piston slap, but I still doubt it. I am definitely looking into this...
Josh
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2008 Salsa Red Pearl DCSB SR5 2WD
Corsa Sport Single Exit, Doug Thorley's, 20% Tint up front, Line-X, Access Roll-Up Tonneau, Alpine Touchscreen Nav, Sirius Satalite Radio... VA 757 Area Group MEETS
Future Mods: Color Matches Grill, Lowering Kit, TRD CAI, Wheels, Fender Flares, Supercharger, JL Stealthbox, Black Headlight Mod...
dont get me wrong, as Ive said many times they're plently of things I love about this truck, but alot of things they could have done alot better with.(tailgate, engine noise, bed bounce)
My table saw makes a lot of noise when cutting 2x4's. Is this normal? You'd think with all the technology today my saw would be quiet.
The fact is an engine this complex with hundreds of moving parts is going to make noise regardless of what someone might think it should sound like.
comparing apples to oranges here, I guarantee that when the other manufacturers come out with motors to compete with the 5.7 they will not make these sounds. your saw costs a couple hundred bucks tops, my truck was much more. I expect alot more for what I spent. I dont think a saw has a couple of hundred moving parts either.
comparing apples to oranges here, I guarantee that when the other manufacturers come out with motors to compete with the 5.7 they will not make these sounds. your saw costs a couple hundred bucks tops, my truck was much more. I expect alot more for what I spent. I dont think a saw has a couple of hundred moving parts either.
Cheers to that bud. I don't care what the engine sounds like when it is drowned out with road noise at 75 mph. When I am idling through a parking lot at 5 mph, a modern motor should be quiet.
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2007 Tundra DC TRD 4x4
Pyrite Mica
Bucket Seats
Cold Kit
Deck Rails
Tow Mirrors
Door sill protectors
Re: Diesel noise explanation
your “hi po” and don’t worry about the “slap”. 
Linear Mode
