4.7 or 5.7????

[slackjaw07]

Originally Posted by kathyricks

Now to play the role of Devil's Advocate:

The 2UZ-FE 4.7 is a tried and true motor very closely related to the now famous 1UZ-FE 1989 Lexus LS400 V8. So while you would need to spend $800 every 90,000 -120,000 miles on a new timing belt, you can be confident the engine has a reputation of lasting through 5-6 timing belt changes. And the 4.7 has bulletproof and rev loving MECHANICAL valve lifters that will never get "sticky" or develop "bleed down" problems as hydraulic valve lifter engines have been known to do.

The 5.7 is an entirely new design with FOUR timing chains and an all new roller rocker arm valvetrain with hydraulic valve lifters. Imagine the cost and complexity of trying to fix problems down the road (if any ever develop) with 32 hydraulic valve lifters and FOUR timing chains !! Timing chains stretch overtime, retarding valve timing and engine performance, especially with leadfooted drivers whereas valve timing and performance will stay the same over time with a timing belt engine like the 4.7. The 5.7 might also be prone to new design maladies like oil leaks, serpentine belt problems (some have already developed) exhaust manifold leaks/cracks and so forth whereas potential problems of this nature were worked through and resolved long ago with the 4.7. The 4.7 is also a much shorter piston stroke engine so it should (in theory) feel more comfortable spinning at high rpm compared to a long stroke tractor type engine like the 5.7. The 4.7 uses 5W-30 engine oil just like the 1989 Lexus V8 - an oil that has proven to protect the engine for over 500,000 miles whereas the 5.7 uses 0W-20 oil - a viscosity with an unproven track record as Toyota only began using it in some 2006 and 2007 engines. The 4.7 also comes with a tried and true 5-speed automatic vs. the all new and unproven 6-speed of the 5.7

So what's your point?

[Tundra_Boy]

there are different engines for different needs. I have a 4.7L and it is adequate for the truck, not slow at all. There is an actual difference in price (based on multiple quotes at the time of purchase), which might not be a big deal for some, but for a guy like me it was.

I can do all the hauling I need to do as with any other truck and the occasional towing is just amazing. A 8100lb towing capacity is not bad at all. Heck a v8 is already a bit over what "I really needed".

I love the truck, the ride is so smooth. I have owned my tundra for a year and it makes those long trips so enjoyable. Maybe I am crazy, but I have no regrets on my purchase.

That's just my opinion based on my daily experience

[Tundra_Boy]

hehe always the interesting 4.7L vs 5.7L and 2wd vs 4wd discussions. Where many guys try to impose their opinions on the rest. As if they knew exactly what everybody needs. Maybe everybody should start getting along as Tundra owners.

[mhollack]

Originally Posted by Tundra_Boy

hehe always the interesting 4.7L vs 5.7L and 2wd vs 4wd discussions. Where many guys try to impose their opinions on the rest. As if they knew exactly what everybody needs. Maybe everybody should start getting along as Tundra owners.

I see your point, however the OP did ask for opinions...

[JT's Tx.Tundra]

Bad news..................I was unable to trade in car for truck, too far upside down on trade. Thank you for all the responses. So until further notice

[pagemaster]

Originally Posted by kathyricks

Now to play the role of Devil's Advocate:

The 2UZ-FE 4.7 is a tried and true motor very closely related to the now famous 1UZ-FE 1989 Lexus LS400 V8. So while you would need to spend $800 every 90,000 -120,000 miles on a new timing belt, you can be confident the engine has a reputation of lasting through 5-6 timing belt changes. And the 4.7 has bulletproof and rev loving MECHANICAL valve lifters that will never get "sticky" or develop "bleed down" problems as hydraulic valve lifter engines have been known to do.

The 5.7 is an entirely new design with FOUR timing chains and an all new roller rocker arm valvetrain with hydraulic valve lifters. Imagine the cost and complexity of trying to fix problems down the road (if any ever develop) with 32 hydraulic valve lifters and FOUR timing chains !! Timing chains stretch overtime, retarding valve timing and engine performance, especially with leadfooted drivers whereas valve timing and performance will stay the same over time with a timing belt engine like the 4.7. The 5.7 might also be prone to new design maladies like oil leaks, serpentine belt problems (some have already developed) exhaust manifold leaks/cracks and so forth whereas potential problems of this nature were worked through and resolved long ago with the 4.7. The 4.7 is also a much shorter piston stroke engine so it should (in theory) feel more comfortable spinning at high rpm compared to a long stroke tractor type engine like the 5.7. The 4.7 uses 5W-30 engine oil just like the 1989 Lexus V8 - an oil that has proven to protect the engine for over 500,000 miles whereas the 5.7 uses 0W-20 oil - a viscosity with an unproven track record as Toyota only began using it in some 2006 and 2007 engines. The 4.7 also comes with a tried and true 5-speed automatic vs. the all new and unproven 6-speed of the 5.7

Well I agree with what you said. I do have to add a few things.

The 2UZ-FE 4.7 is a tried and true motor very closely related to the now famous 1UZ-FE 1989 Lexus LS400 V8.

Big deal. The 4.0 was from 1989. This is 2008. The 5.7 is based off the LS460

Imagine the cost and complexity of trying to fix problems down the road

Yes but a timing belt failure or break of the 4.7 would be catosrophic. With that being said, I have only heard of one timing belt failure and it was on this forum and I believe the owner did not do the timing belt change when required.

exhaust manifold leaks/cracks

The 4.7 is well know for exhaust manifold leaks.

unproven 6-speed

Toyota is using the exact same transmission of the Tundra 5.7 in the Land Cruiser 70 series Chassis, pickup truck 4.5 diesel vehicles used in Africa and Australia.

So what's your point?

The point is the 4.7 will likely last longer. The 4.7 was designed for first for the 1998 Toyota Land Cruiser and then used in Tundra, GX, 4runner, Sequoia etc. The 4.7 was designed for world markets long before Toyota could get v8 engine manufacturing up to speed in the USA. Once Toyota did start builing the 4.7, they started using plastic manifolds.

As for the 5.7 iForce.

1. The 5.7 is the perfect engine for a half ton pick up truck in the North American markets. Most Americans do not keep truck to 200,000 and beyond so a timing chain stretching or failure won't matter.

2. As far as I know. Chains are stronger that belts and are lest likely to fail.

The 2UZ-FE 4.7 is a tried and true

Here is something to think about.

1. The United Nations as far as I know does not use the 4.7 in their fleet. They do use the 4.0 v6 in Land Cruiser 200 series and that is designed with a timing chain. The 4.5 diesel engine that is used in troopies is equipped to the 6 speed in that is used in the Tundra...the 4.5 uses a timing chain as far I know. So if the UN is using them, I am sure Americans will be OK.

2. The 5.7 makes more horsepower, gets better MPG and used a timing chain that should be stronger than any timing belt.

3. 20 years have passed since the 4.7 based 4.0 was introduced. I am sure Toyota has taken all measures to make sure that the 5.7 will last a long time.

4. Toyota has moved to timing chains in almost all its new engines.

5. The replacement engine for the Tundra 4.7 will likely have a timing chain.



I am a 2003 4.7 v8iForce owner. The engine is more than I could ever ask for in terms of reliability, maintenance, and smoothness. The MPG is bad and the engine needs more top end HP. Torque is good and spark plug access is excellent. I don;t have the plastic manifold of the 2005+ engines and I don't have the exhaust manifold leak.

If I was going to get a new Tundra. I would get the 5.7 without a doubt. If there were a $5000 difference between the 5.7 and 4.7 I would get the 4.7. If I was going to keep my truck till 300,000 miles then I would choose the 4.7

The performance of the 5.7 is outstanding. The reliability of the 4.7 is awesome. My sights are set on a 5.7 Toyota Land Cruiser......the 5.7 in the Land Cruiser is built in Japan but Africa uses the 4.7/5speed or 4.5/6speed..............maybe that says something.

[seadragon]

In my opinion, as far as longevity goes, the undercarriage and frame on these trucks will go out long before the engine does, especially if you live in a salt zone like me.

[pagemaster]

Originally Posted by seadragon

In my opinion, as far as longevity goes, the undercarriage and frame on these trucks will go out long before the engine does, especially if you live in a salt zone like me.

I doubt that. The American made Toyota's are now designed to resist rust better than ever before. The older Japan made imports didn't do to well with salt

[seadragon]

Originally Posted by pagemaster

I doubt that. The American made Toyota's are now designed to resist rust better than ever before. The older Japan made imports didn't do to well with salt

LOL! You can't be serious.

Have you seen the pics of mine after it's first winter?

[insaneR6]

Originally Posted by seadragon

LOL! You can't be serious.

Have you seen the pics of mine after it's first winter?

Out of curiosity, did you store it indoors?

My radiant red truck is currently alpine white from the salt, we'll see what spring shows

As a 4.7 owner, i'm happy with my decision as it suited my needs. The price wasn't so much a factor as knowledge of "myself". The only reason for the 5.7 is the extra towing capacity, and the extra hp/torque.

Unless your racing, or towing 10'000 lbs it's really the same truck. Well, that and the oil filter is easier to deal with on the 4.7. Actually, i'd be curious to see if the difference in price for an oil change (if there is one, due to the 'extra labour needed' for the 5.7) over time adds up to the cost of the timing belt change for the 4.7.... for the people who have it done at a shop/dealer of course

In anycase, i knew with the 5.7 i'd probably wind up having the popo take my keys away as I wouldn't be able to resist smashing the go pedal every time I could. Heck, i do that with the 4.7 enough as it is. Plus the extra gas consumption from repeated WOT runs to the speed limit would hurt my wallet.

The 4.7 was my method of self restraint. Whenever i do start to mutter about wanting a 5.7 for the engine, my wife just tells me "You don't need to compensate"

The proven 4.7 history was a factor too.

[pagemaster]

Originally Posted by seadragon

LOL! You can't be serious.

Have you seen the pics of mine after it's first winter?

Normal surface corrosion. My 2003 has it. I wish I sprayed the bottom but I didn't. All american vehicle have corrosion underneath if you live in areas with salt. If I am correct, your rear end is actually painted black...I may be wrong.

Rusting throught the frame and the body is what you should be worried about. Old Japanese Toyotas did this, Chances of that happening to your Tundra are not that likely.

[tomhole]

I just made this decision and I based it on my needs. I had a 2005 Tundra with the 4.7 that I used to tow a travel trailer (6500 lbs). All weights on the 2005 were max'd out. The 4.7 pulled great and I enjoyed its performance. Although keeping the go pedal on the floor for 8-9 minutes at a stretch through West Virgina was kinda scary, the 4.7 delivered. Driving without a trailer, the 4.7 was more than I needed.

I wrecked that truck Tues. For me, there was no decision to make. I went with the 5.7L for towing. Actually, I really wanted the 6 speed tranny with the 4.30 rear end. That's sweet for towing heavy. If I weren't towing, I still probably would have gotten the 5.7, but not because I needed it. Luckily we get a choice.

Now if they would only put a 6 1/2 ft bed on the crewmax, this truck would be perfect.

Tom